1
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Westendorff KS, Hülsey MJ, Wesley TS, Román-Leshkov Y, Surendranath Y. Electrically driven proton transfer promotes Brønsted acid catalysis by orders of magnitude. Science 2024; 383:757-763. [PMID: 38359117 DOI: 10.1126/science.adk4902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 01/11/2024] [Indexed: 02/17/2024]
Abstract
Electric fields play a key role in enzymatic catalysis and can enhance reaction rates by 100,000-fold, but the same rate enhancements have yet to be achieved in thermochemical heterogeneous catalysis. In this work, we probe the influence of catalyst potential and interfacial electric fields on heterogeneous Brønsted acid catalysis. We observed that variations in applied potential of ~380 mV led to a 100,000-fold rate enhancement for 1-methylcyclopentanol dehydration, which was catalyzed by carbon-supported phosphotungstic acid. Mechanistic studies support a model in which the interfacial electrostatic potential drop drives quasi-equilibrated proton transfer to the adsorbed substrate prior to rate-limiting C-O bond cleavage. Large increases in rate with potential were also observed for the same reaction catalyzed by Ti/TiOyHx and for the Friedel Crafts acylation of anisole with acetic anhydride by carbon-supported phosphotungstic acid.
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Affiliation(s)
- Karl S Westendorff
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Max J Hülsey
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Thejas S Wesley
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Yuriy Román-Leshkov
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Yogesh Surendranath
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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2
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Okazaki M, Otomo J. Electrode-Supported Protonic Ceramic Electrolysis Cells for Electrochemically Promoted Ammonia Synthesis at Intermediate Temperatures. ACS OMEGA 2023; 8:40299-40308. [PMID: 37929123 PMCID: PMC10620894 DOI: 10.1021/acsomega.3c04478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 08/26/2023] [Accepted: 09/26/2023] [Indexed: 11/07/2023]
Abstract
Protonic ceramic electrolysis cells (PCECs) have attracted attention for their applications in electrochemical ammonia synthesis, but their low Faradaic efficiency and thermodynamic constraints at high operating temperatures have led to low ammonia formation rates. In this work, electrode-supported PCECs with a noble-metal-free Ni-BaZr0.8Y0.2O3-δ cathode and a spin-coated proton-conducting electrolyte were developed for ammonia electrosynthesis, conducted in a single-chamber reactor cofed with N2 and H2. Ammonia formation rates increased non-Faradaically with applied voltage, reaching up to 1.1 × 10-8 mol s-1 cm-2 at 400 °C, which corresponds approximately to a 150 °C reduction in operating temperature compared to previously reported works conducted in mixed N2 and H2. The improved performance at intermediate temperatures by using a Ni catalyst is attributed to the electrochemical promotion of catalysis upon cathodic polarization. By fabrication of a cell with low Ohmic losses and improved contact resistance at the anode-electrolyte interface, sufficient cathodic polarization to accelerate ammonia formation was achieved, even at 400 °C. A combined water electrolysis and ammonia synthesis system is proposed, where the hydrogen byproduct from water electrolysis can be efficiently utilized via a recycling process; such a system requires enhanced ammonia formation in a mixed N2/H2 atmosphere, as demonstrated in this work.
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Affiliation(s)
- Moe Okazaki
- Department
of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8561, Japan
| | - Junichiro Otomo
- Department
of Transdisciplinary Science and Engineering, School of Environment
and Society, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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3
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Wu Y, Yang W, Zhang H, Xu H, Jiao Y, Zhong L, Wang J, Chen Y. Boosting Methane Combustion over Pd/Y 2O 3-ZrO 2 Catalyst by Inert Silicate Patches Tuning Both Palladium Chemistry and Support Hydrophobicity. ACS APPLIED MATERIALS & INTERFACES 2023; 15:44887-44898. [PMID: 37721481 DOI: 10.1021/acsami.3c08087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/19/2023]
Abstract
Supported palladium (Pd) catalysts are widely utilized to reduce the emission of exhaust CH4 from lean-burn engines by catalytic combustion. A large amount of water vapor in the exhaust makes hydroxyls accumulate on the catalyst surface at temperatures below 450 °C, leading to severe catalyst deactivation. Tuning palladium chemistry and inhibiting water adsorption are critical to developing active catalysts. Modifying the support surface with inert silicates would both change the palladium-support interaction and decrease water adsorption sites. This study reports an improved Pd/Y2O3-ZrO2 catalyst by constructing silicate patches on yttria-stabilized zirconia (Y2O3-ZrO2) support. The silicates hindered electron transfer from Y2O3-ZrO2 oxygen vacancies to palladium, which optimized palladium chemistry, especially the reducibility of active PdO species, and thereby boosted CH4 conversion under dry conditions. The temperature of 90% methane conversion (T90) over the catalyst decreased from 386 to 309 °C. Moreover, the inert silicates decreased surface oxygen vacancies of Y2O3-ZrO2 to improve support hydrophobicity, thereby inhibiting hydroxyl accumulation. The poisoning effect of water on the active sites located on the palladium-silicate interface was alleviated. When reaction gases contained 10 vol % water, the silicate-modified catalyst still showed higher activity with T90 of 404 °C, which is lower than T90 of 452 °C for unmodified catalyst. This work represents a step forward in preparing high-performance palladium catalysts for low-temperature wet methane combustion.
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Affiliation(s)
- Yang Wu
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
| | - Wenhu Yang
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610065, China
| | - Hailong Zhang
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610065, China
| | - Haidi Xu
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
| | - Yi Jiao
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
| | - Lin Zhong
- College of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Jianli Wang
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610065, China
| | - Yaoqiang Chen
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610065, China
- College of Chemical Engineering, Sichuan University, Chengdu 610065, China
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4
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Drosou C, Nikolaraki E, Georgakopoulou T, Fanourgiakis S, Zaspalis VT, Yentekakis IV. Methane Catalytic Combustion under Lean Conditions over Pristine and Ir-Loaded La 1-xSr xMnO 3 Perovskites: Efficiency, Hysteresis, and Time-on-Stream and Thermal Aging Stabilities. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2271. [PMID: 37570587 PMCID: PMC10420673 DOI: 10.3390/nano13152271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 08/02/2023] [Accepted: 08/03/2023] [Indexed: 08/13/2023]
Abstract
The increasing use of natural gas as an efficient, reliable, affordable, and cleaner energy source, compared with other fossil fuels, has brought the catalytic CH4 complete oxidation reaction into the spotlight as a simple and economic way to control the amount of unconverted methane escaping into the atmosphere. CH4 emissions are a major contributor to the 'greenhouse effect', and therefore, they need to be effectively reduced. Catalytic CH4 oxidation is a promising method that can be used for this purpose. Detailed studies of the activity, oxidative thermal aging, and the time-on-stream (TOS) stability of pristine La1-xSrxMnO3 perovskites (LSXM; X = % substitution of La with Sr = 0, 30, 50 and 70%) and iridium-loaded Ir/La1-xSrxMnO3 (Ir/LSXM) perovskite catalysts were conducted in a temperature range of 400-970 °C to achieve complete methane oxidation under excess oxygen (lean) conditions. The effect of X on the properties of the perovskites, and thus, their catalytic performance during heating/cooling cycles, was studied using samples that were subjected to various pretreatment conditions in order to gain an in-depth understanding of the structure-activity/stability correlations. Large (up to ca. 300 °C in terms of T50) inverted volcano-type differences in catalytic activity were found as a function of X, with the most active catalysts being those where X = 0%, and the least active were those where X = 50%. Inverse hysteresis phenomena (steady-state rate multiplicities) were revealed in heating/cooling cycles under reaction conditions, the occurrence of which was found to depend strongly on the employed catalyst pre-treatment (pre-reduction or pre-oxidation), while their shape and the loop amplitude were found to depend on X and the presence of Ir. All findings were consistently interpreted, which involved a two-term mechanistic model that utilized the synergy of Eley-Rideal and Mars-van Krevelen kinetics.
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Affiliation(s)
- Catherine Drosou
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
| | - Ersi Nikolaraki
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
| | - Theodora Georgakopoulou
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
| | - Sotiris Fanourgiakis
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
| | - Vassilios T. Zaspalis
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece;
- Chemical Process and Energy Resources Institute, Center for Research and Technology Hellas (CPERI/CERTH), 570 01 Thermi, Thessaloniki, Greece
| | - Ioannis V. Yentekakis
- Laboratory of Physical Chemistry and Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 731 00 Chania, Crete, Greece; (E.N.); (T.G.); (S.F.)
- Institute of GeoEnergy, Foundation for Research and Technology-Hellas (FORTH/IG), 731 00 Chania, Greece
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5
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Lymperi A, Chatzilias C, Xydas F, Martino E, Kyriakou G, Katsaounis A. Electrochemical Promotion of CO 2 Hydrogenation Using a Pt/YSZ Fuel Cell Type Reactor. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1930. [PMID: 37446446 DOI: 10.3390/nano13131930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/22/2023] [Accepted: 06/23/2023] [Indexed: 07/15/2023]
Abstract
The hydrogenation of CO2 is a reaction of key technological and environmental importance, as it contributes to the sustainable production of fuels while assisting in the reduction of a major greenhouse gas. The reaction has received substantial attention over the years within the catalysis and electrocatalysis communities. In this respect, the electrochemical promotion of catalysis (EPOC) has been applied successfully to the CO2 hydrogenation reaction to improve the catalytic activity and selectivity of conductive films supported on solid electrolytes. However, designing an effective electrocatalytic reactor remains a challenge due to the connections required between the electrodes and the external potentiostat/galvanostat. This drawback could be alleviated if the catalytic reaction occurs in a reactor that simultaneously operates as a power generator. In this work, the Electrochemical Promotion of the CO2 hydrogenation reaction in a low-temperature solid oxide electrolyte fuel cell (SOFC) reactor is studied using yttria-stabilized zirconia (YSZ) and a platinum (Pt) electrode catalyst. The system has been studied in two distinct operation modes: (i) when the necessary energy for the electrochemical promotion is produced through the parallel reaction of H2 oxidation (galvanic operation) and (ii) when a galvanostat/potentiostat is used to impose the necessary potential (electrolytic operation). The performance of the fuel cell declines less than 15% in the presence of the reactant mixture (CO2 and H2) while producing enough current to conduct EPOC experiments. During the electrolytic operation of the electrochemical cell, the CO production rate is significantly increased by up to 50%.
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Affiliation(s)
- Andriana Lymperi
- Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
| | - Christos Chatzilias
- Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
- School of Sciences and Engineering, University of Nicosia, Nicosia 2417, Cyprus
| | - Fotios Xydas
- Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
| | - Eftychia Martino
- Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
| | - Georgios Kyriakou
- Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
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6
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Wang Q, Shang Z, Wang H, Wei A. Electro- and photoactivation of silver-iron oxide particles as magnetically recyclable catalysts for cross-coupling reactions. NANOSCALE 2023; 15:5074-5082. [PMID: 36806420 PMCID: PMC10057351 DOI: 10.1039/d2nr04629f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Colloidal Ag particles decorated with Fe3O4 islands can be electrochemically or photochemically activated as inverse catalysts for C(sp2)-H heteroarylation. The silver-iron oxide (SIO) particles are reduced into redox-active forms by cathodic charging at mild potentials or by short-term light exposure, and can be reused multiple times by magnetic cycling without further activation. A negative shift in the reduction peak is attributed to an overpotential produced by surface Fe3O4 which separates residual Ag ions or clusters from bulk silver. The catalytic efficiency of SIO is maintained even with acid degradation, which can be countered simply by adding water to the reaction medium.
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Affiliation(s)
- Qi Wang
- Dept. of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, USA.
| | - Zhongxia Shang
- Dept. of Materials Science and Engineering, Purdue University, 525 Northwestern Ave, West Lafayette, IN, USA
| | - Haiyan Wang
- Dept. of Materials Science and Engineering, Purdue University, 525 Northwestern Ave, West Lafayette, IN, USA
| | - Alexander Wei
- Dept. of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, USA.
- Dept. of Materials Science and Engineering, Purdue University, 525 Northwestern Ave, West Lafayette, IN, USA
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7
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Zhang W, Yashima M. Recent developments in oxide ion conductors: focusing on Dion-Jacobson phases. Chem Commun (Camb) 2022; 59:134-152. [PMID: 36510789 DOI: 10.1039/d2cc05288a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Oxide-ion conductors, also known as "oxygen ion conductors," have garnered significant attention in recent years due to their extensive applications in a variety of electrochemical devices, including oxygen concentrators, solid-oxide fuel cells (SOFCs), and solid oxide electrolysis cells. The key to improving the performance of these devices is the creation of novel oxide-ion conductors. In this feature article, we discuss the recent developments of new structural families of oxide-ion conductors and of the Dion-Jacobson-type layered oxide-ion conductors with a particular emphasis on CsM2Ti2NbO10-δ (M = Bi and lanthanoids; δ represents oxygen-vacancy content) and their solid solutions. CsBi2Ti2NbO10-δ is the first example of an oxide-ion conductor with a Dion-Jacobson-type layered perovskite structure, and the structural characteristics of these materials are extracted here. We have proposed an original concept that the large sized Cs+ cations and M3+ displacements yield the large bottlenecks for oxide-ion migration, which would facilitate the discovery of novel oxide-ion conductors. This article presents evidence that Dion-Jacobson-type layered perovskites are superior oxide-ion conductors. We also demonstrate how the information gleaned from these studies can be applied to the design of novel oxide-ion conductors.
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Affiliation(s)
- Wenrui Zhang
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-17 O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-17 O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.
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8
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Kim MJ, Joo Park S, Duk Kim K, Kim W, Chan Nam S, Seok Go K, Goo Jeon S. Fabrication of carbon nanotube with high purity and crystallinity by methane decomposition over ceria-supported catalysts. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.11.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Fuel Cell Reactors for the Clean Cogeneration of Electrical Energy and Value-Added Chemicals. ELECTROCHEM ENERGY R 2022. [DOI: 10.1007/s41918-022-00168-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractFuel cell reactors can be tailored to simultaneously cogenerate value-added chemicals and electrical energy while releasing negligible CO2 emissions or other pollution; moreover, some of these reactors can even “breathe in” poisonous gas as feedstock. Such clean cogeneration favorably offsets the fast depletion of fossil fuel resources and eases growing environmental concerns. These unique reactors inherit advantages from fuel cells: a high energy conversion efficiency and high selectivity. Compared with similar energy conversion devices with sandwich structures, fuel cell reactors have successfully “hit three birds with one stone” by generating power, producing chemicals, and maintaining eco-friendliness. In this review, we provide a systematic summary on the state of the art regarding fuel cell reactors and key components, as well as the typical cogeneration reactions accomplished in these reactors. Most strategies fall short in reaching a win–win situation that meets production demand while concurrently addressing environmental issues. The use of fuel cells (FCs) as reactors to simultaneously produce value-added chemicals and electrical power without environmental pollution has emerged as a promising direction. The FC reactor has been well recognized due to its “one stone hitting three birds” merit, namely, efficient chemical production, electrical power generation, and environmental friendliness. Fuel cell reactors for cogeneration provide multidisciplinary perspectives on clean chemical production, effective energy utilization, and even pollutant treatment, with far-reaching implications for the wider scientific community and society. The scope of this review focuses on unique reactors that can convert low-value reactants and/or industrial wastes to value-added chemicals while simultaneously cogenerating electrical power in an environmentally friendly manner.
Graphical Abstract
A schematic diagram for the concept of fuel cell reactors for cogeneration of electrical energy and value-added chemicals
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10
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FeOx nanoparticle doping on Cu/Al2O3 catalysts for the reverse water gas shift. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Guo X, Yao L, Hou X, Wu X, Zhang Y, Zhu Q, Guo Z, Li S, Jiang Y, Feng S, Huang K. An exsolution constructed FeNi/NiFe 2O 4 composite: preferential breaking of octahedral metal-oxygen bonds in a spinel oxide. Chem Sci 2022; 13:9440-9449. [PMID: 36093019 PMCID: PMC9384820 DOI: 10.1039/d2sc02149h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 07/07/2022] [Indexed: 11/21/2022] Open
Abstract
Exsolution is an ingenious strategy for the in situ construction of metal- or alloy-decorated oxides and, due to its promising energy related catalysis applications, has advanced from use in perovskites to use in spinels. Despite its great importance for designing target composites, the ability to identify whether active metal ions at octahedral or tetrahedral sites will preferentially exsolve in a spinel remains unexplored. Here, an inverse spinel NiFe2O4 (NFO) was employed as a prototype and FeNi/NFO composites were successfully constructed via exsolution. The preferential breaking of octahedral metal-oxygen bonds in the spinel oxide was directly observed using Mössbauer and X-ray absorption spectroscopy. This was further verified from the negative segregation energies calculated based on density-functional theory. One exsolved FeNi/NFO composite exhibits enhanced electrochemical activity with an overpotential of 283 mV at 10 mA cm-2 and a long stability time for the oxygen evolution reaction. This work offers a unique insight into spinel exsolution based on the preferential breaking of chemical bonds and may be an effective guide for the design of new composite catalysts where the desired metal ions are deliberately introduced to octahedral and/or tetrahedral sites.
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Affiliation(s)
- Xiaoyan Guo
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Lu Yao
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Xiangyan Hou
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Xiaofeng Wu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Yaowen Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Qian Zhu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Zhangtao Guo
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Shuting Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Yilan Jiang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University Nanjing 210098 China
| | - Shouhua Feng
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
| | - Keke Huang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin Provincial International Cooperation Key Laboratory of Advanced Inorganic Solid Functional Materials, College of Chemistry, Jilin University Qianjin Street 2699 Changchun 130012 China
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12
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Pahija E, Panaritis C, Gusarov S, Shadbahr J, Bensebaa F, Patience G, Boffito DC. Experimental and Computational Synergistic Design of Cu and Fe Catalysts for the Reverse Water–Gas Shift: A Review. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Ergys Pahija
- Department of Chemical Engineering, Polytechnique Montréal, P.O. Box 6079, Station Centre-Ville, Montréal, Québec H3C 3A7, Canada
| | - Christopher Panaritis
- Department of Chemical Engineering, Polytechnique Montréal, P.O. Box 6079, Station Centre-Ville, Montréal, Québec H3C 3A7, Canada
| | - Sergey Gusarov
- Nanotechnology Research Center, National Research Council of Canada, 11421 Saskatchewan Drive, Edmonton, Alberta T6G 2M9, Canada
| | - Jalil Shadbahr
- Energy, Mining and Environment Research Centre, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Farid Bensebaa
- Energy, Mining and Environment Research Centre, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
| | - Gregory Patience
- Department of Chemical Engineering, Polytechnique Montréal, P.O. Box 6079, Station Centre-Ville, Montréal, Québec H3C 3A7, Canada
| | - Daria Camilla Boffito
- Department of Chemical Engineering, Polytechnique Montréal, P.O. Box 6079, Station Centre-Ville, Montréal, Québec H3C 3A7, Canada
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13
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Panaritis C, Yan S, Couillard M, Baranova EA. Electrochemical study of the metal-support interaction between FeOx nanoparticles and cobalt oxide support for the reverse water gas shift reaction. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2021.101824] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Zagoraios D, Kokkinou N, Kyriakou G, Katsaounis A. Electrochemical control of the RWGS reaction over Ni nanoparticles deposited on yttria stabilized zirconia. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02140k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transition metal oxides are promising candidates for the activation of the reverse water gas shift (RWGS) reaction. The in-situ formation and stabilization of these oxides appears to be a key...
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15
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Wang J, Couillard M, Baranova E. Electrochemical Promotion of Copper Nanoparticles for the Reverse Water Gas Shift Reaction. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02315b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electrochemical promotion of catalysis (EPOC) is one of the promising ways to in-situ control and enhance catalytic processes of the reverse water gas shift reaction (RWGS), which recycles carbon dioxide...
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16
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Kyriakou V, Sharma RK, Neagu D, Peeters F, De Luca O, Rudolf P, Pandiyan A, Yu W, Cha SW, Welzel S, van de Sanden MCM, Tsampas MN. Plasma Driven Exsolution for Nanoscale Functionalization of Perovskite Oxides. SMALL METHODS 2021; 5:e2100868. [PMID: 34928018 DOI: 10.1002/smtd.202100868] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 10/03/2021] [Indexed: 06/14/2023]
Abstract
Perovskite oxides with dispersed nanoparticles on their surface are considered instrumental in energy conversion and catalytic processes. Redox exsolution is an alternative method to the conventional deposition techniques for directly growing well-dispersed and anchored nanoarchitectures from the oxide support through thermochemical or electrochemical reduction. Herein, a new method for such nanoparticle nucleation through the exposure of the host perovskite to plasma is shown. The applicability of this new method is demonstrated by performing catalytic tests for CO2 hydrogenation over Ni exsolved nanoparticles prepared by either plasma or conventional H2 reduction. Compared to the conventional thermochemical H2 reduction, there are plasma conditions that lead to the exsolution of a more than ten times higher Ni amount from a lanthanum titanate perovskite, which is similar to the reported values of the electrochemical method. Unlike the electrochemical method, however, plasma does not require the integration of the material in an electrochemical cell, and is thus applicable to a wide range of microstructures and physical forms. Additionally, when N2 plasma is employed, the nitrogen species are stripping out oxygen from the perovskite lattice, generating a key chemical intermediate, such as NO, rendering this technology even more appealing.
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Affiliation(s)
- Vasileios Kyriakou
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5612 AJ, The Netherlands
- Engineering & Technology Institute Groningen, University of Groningen, Groningen, 9747 AG, The Netherlands
| | - Rakesh Kumar Sharma
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5612 AJ, The Netherlands
| | - Dragos Neagu
- Department of Chemical and Process Engineering, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Floran Peeters
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5612 AJ, The Netherlands
| | - Oreste De Luca
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, 9747 AG, The Netherlands
| | - Petra Rudolf
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, 9747 AG, The Netherlands
| | - Arunkumar Pandiyan
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5612 AJ, The Netherlands
| | - Wonjong Yu
- Department of Aerospace and Mechanical Engineering, Seoul National University, Seoul, 151-744, South Korea
| | - Suk Won Cha
- Department of Aerospace and Mechanical Engineering, Seoul National University, Seoul, 151-744, South Korea
| | - Stefan Welzel
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5612 AJ, The Netherlands
| | - Mauritius C M van de Sanden
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5612 AJ, The Netherlands
- Department of Applied Physics, Eindhoven University of Technology, Eindhoven, 5600 MB, The Netherlands
| | - Mihalis N Tsampas
- Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven, 5612 AJ, The Netherlands
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17
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Intiso A, Rossi F, Proto A, Cucciniello R. The fascinating world of mayenite (Ca12Al14O33) and its derivatives. RENDICONTI LINCEI. SCIENZE FISICHE E NATURALI 2021. [DOI: 10.1007/s12210-021-01025-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AbstractMayenite (12CaO·7Al2O3) is a mesoporous calcium aluminum oxide, with a characteristic crystalline structure. The framework of mayenite is composed of interconnected cages with a positive electric charge per unit cell that includes two molecules [Ca24Al28O64]4+, and the remaining two oxide ions O2−, often labelled “free oxygen”, are trapped in the cages defined by the framework. Starting from mayenite structure several derivatives have been prepared through advanced synthetic protocols by free oxygen substitution with various anions. Mayenite and its derivates have been intensively investigated in many applications which include catalysis (oxidation and reduction, ammonia synthesis, pinacol coupling), environmental sensors and CO2 sorbent materials. In this review, we summarize our recent results on the main applications of mayenite and its derivatives.
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18
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Chen X, Jia Z, Huang F, Diao J, Liu H. Atomically dispersed metal catalysts on nanodiamond and its derivatives: synthesis and catalytic application. Chem Commun (Camb) 2021; 57:11591-11603. [PMID: 34657938 DOI: 10.1039/d1cc05202k] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Atomically dispersed metal catalysts (ADMCs) have attracted increasing interest in the field of heterogeneous catalysis. As sub-nanometric catalysts, ADMCs have exhibited remarkable catalytic performance in many reactions. ADMCs are classified into two categories: single atom catalysts (SACs) and atomically dispersed clusters with a few atoms. To stabilize the highly active ADMCs, nanodiamond (ND) and its derivatives (NDDs) are promising supports. In this Feature Article, we have introduced the advantages of NDDs with a highly curved surface and tunable surface properties. The controllable defective sites and oxygen functional groups are known as the anchoring sites for ADMCs. Tunable surface acid-base properties enable ADMCs supported on NDDs to exhibit unique selectivity towards target products and an extended lifetime in many reactions. In addition, we have firstly overviewed the recent advances in the synthesis strategies for effectively fabricating ADMCs on NDDs, and further discussed how to achieve the atomic dispersion of metal precursors and stabilize the as-formed metal atoms against migration and agglomeration based on NDDs. And then, we have also systematically summarized the advantages of ADMCs supported on NDDs in reactions, including hydrogenation, dehydrogenation, aerobic oxidation and electrochemical reaction. These reactions can also effectively guide the design of ADMCs. The recent progress in understanding the effect of structure of active centers and metal-support interactions (MSIs) on the catalytic performance of ADMCs is particularly highlighted. At last, the possible research directions in ADMCs are forecasted.
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Affiliation(s)
- Xiaowen Chen
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, P. R. China.,Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China.
| | - Zhimin Jia
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, P. R. China.,Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China.
| | - Fei Huang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China.
| | - Jiangyong Diao
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China.
| | - Hongyang Liu
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, P. R. China.,Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China.
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19
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Toghan A, Greiner M, Knop-Gericke A, Imbihl R. Identification of the surface species in electrochemical promotion: ethylene oxidation over a Pt/YSZ catalyst. Phys Chem Chem Phys 2021; 23:21591-21598. [PMID: 34557885 DOI: 10.1039/d1cp02757c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrochemical promotion of the C2H4 + O2 total oxidation reaction over a Pt catalyst, interfaced to yttrium stabilized zirconia (YSZ), has been studied at 0.25 mbar and T = 650 K using near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) as an in situ method. The electrochemical promoter effect is linked to the presence of a several layers thick graphitic overlayer that forms on the Pt surface in the presence of C2H4. Our NAP-XPS investigation reveals that electrochemical pumping of the Pt/YSZ catalyst, using a positive potential, leads to the spillover of oxygen surface species from the YSZ support onto the surface of the Pt electrode. Based on the XP spectra, the spillover species on Pt is identical to oxygen chemisorbed from the gas-phase.
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Affiliation(s)
- Arafat Toghan
- Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universität Hannover, Callinstrasse 3A, D-30167 Hannover, Germany. .,Chemistry Department, Faculty of Science, South Valley University, 83523 Qena, Egypt
| | - Mark Greiner
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34 - 36, 445470 Mülheim an der Ruhr, Germany
| | - Axel Knop-Gericke
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Ronald Imbihl
- Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universität Hannover, Callinstrasse 3A, D-30167 Hannover, Germany.
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21
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Effect of Pd and Ir as Promoters in the Activity of Ni/CeZrO2 Catalyst for the Reverse Water-Gas Shift Reaction. Catalysts 2021. [DOI: 10.3390/catal11091076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Catalytic conversion of CO2 to CO using reverse water gas shift (RWGS) reaction is a key intermediate step for many CO2 utilization processes. RWGS followed by well-known synthesis gas conversion may emerge as a potential approach to convert CO2 to valuable chemicals and fuels. Nickel (Ni) based catalysts with ceria-zirconia (Ce-Zr) support can be used to tune the metal-support interactions, resulting in a potentially enhanced CO2 hydrogenation rate and elongation of the catalyst lifespan. The thermodynamics of RWGS reaction is favored at high temperature for CO2 conversion. In this paper the effect of Palladium (Pd) and Iridium (Ir) as promoters in the activity of 10 wt%Ni 2 wt%Pd 0.1wt%Ir/CeZrO2 catalyst for the reverse water gas shift reaction was investigated. RWGS was studied for different feed (CO2:H2) ratios. The new active interface between Ni, Pd and Ir particles is proposed to be an important factor in enhancing catalytic activity. 10 wt%Ni 2 wt%Pd 0.1 wt%Ir/CeZrO2 catalyst showed a better activity with CO2 conversion of 52.4% and a CO selectivity of 98% for H2:CO2 (1:1) compared to the activity of 10%Ni/CeZrO2 with CO2 conversion of 49.9% and a CO selectivity of 93%. The catalytic activity for different feed ratios using 10 wt%Ni 2 wt%Pd 0.1 wt%Ir/CeZrO2 were also studied. The use of palladium and iridium boosts the stability and life span of the Ni-based catalysts. This indicates that the catalyst could be used potentially to design RWGS reactors for CO2 utilization units.
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Pinzón M, Ruiz-López E, Romero A, de la Osa A, Sánchez P, de Lucas-Consuegra A. Electrochemical activation of Ru catalyst with alkaline ion conductors for the catalytic decomposition of ammonia. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111721] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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23
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Tian S, Zhan S, Lou Z, Zhu J, Feng J, Xiong Y. Electrodeposition synthesis of 3D-NiO1-δ flowers grown on Ni foam monolithic catalysts for efficient catalytic ozonation of VOCs. J Catal 2021. [DOI: 10.1016/j.jcat.2021.04.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Yakoumis I, Polyzou Ε, Moschovi AM. PROMETHEUS: A Copper-Based Polymetallic Catalyst for Automotive Applications. Part II: Catalytic Efficiency an Endurance as Compared with Original Catalysts. MATERIALS 2021; 14:ma14092226. [PMID: 33925993 PMCID: PMC8123593 DOI: 10.3390/ma14092226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/19/2021] [Accepted: 04/20/2021] [Indexed: 11/16/2022]
Abstract
PROMETHEUS catalyst, a copper-based polymetallic nano-catalyst has been proven to be suitable for automotive emission control applications. This novel catalyst consists of copper, palladium and rhodium nanoparticles as active phases, impregnated on an inorganic oxide substrate, CeO2/ZrO2 (75%, 25%). The aim of PROMETHEUS catalyst’s development is the substitution of a significant amount (85%) of Platinum Group Metals (PGMs) with copper nanoparticles while, at the same time, presenting high catalytic efficiency with respect to the commercial catalysts. In this work, an extensive investigation of the catalytic activity of full scale PROMETHEUS fresh and aged catalyst deposited on ceramic cordierites is presented and discussed. The catalytic activity was tested on an Synthetic Gas Bench (SGB) towards the oxidation of CO and CH4 and the reduction of NO. The loading of the washcoat was 2 wt% (metal content) on Cu, Pd, Rh with the corresponding metal ratio at 21:7:1. The concentration of the full-scale monolithic catalysts to be 0.032% total PGM loading for meeting Euro III standard and 0.089% for meeting Euro IV to Euro VIb standards. The catalytic activity of all catalysts was tested both in rich-burn (λ = 0.99) and lean-burn conditions (λ = 1.03).
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25
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Alabdullah M, Ibrahim M, Dhawale D, Bau JA, Harale A, Katikaneni S, Gascon J. Rhodium Nanoparticle Size Effects on the CO
2
Reforming of Methane and Propane. ChemCatChem 2021. [DOI: 10.1002/cctc.202100063] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Mohammed Alabdullah
- KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia
| | - Mahmoud Ibrahim
- KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia
| | - Dattatray Dhawale
- KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia
| | - Jeremy A. Bau
- KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia
| | - Aadesh Harale
- Carbon Management R&D Research and Development Center Saudi Aramco Dhahran 31311 Saudi Arabia
| | - Sai Katikaneni
- Carbon Management R&D Research and Development Center Saudi Aramco Dhahran 31311 Saudi Arabia
| | - Jorge Gascon
- KAUST Catalysis Center (KCC) King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia
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26
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Téllez-Salazar W, Ovalle-Encinia O, Ramírez-Rosales D, Ma X, Dorantes-Rosales H, Lara-García H, Ortiz-Landeros J. Chemical synthesis and evaluation of Co3O4/Ce0.9Zr0.05Y0.05O2-δ mixed oxides for the catalytic-assisted combustion of soot. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116443] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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27
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Grigoriou D, Zagoraios D, Katsaounis A, Vayenas C. The role of the promoting ionic species in electrochemical promotion and in metal-support interactions. Catal Today 2021. [DOI: 10.1016/j.cattod.2019.08.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Yakoumis I. PROMETHEUS: A Copper-Based Polymetallic Catalyst for Automotive Applications. Part I: Synthesis and Characterization. MATERIALS (BASEL, SWITZERLAND) 2021; 14:622. [PMID: 33572954 PMCID: PMC7866378 DOI: 10.3390/ma14030622] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/20/2021] [Accepted: 01/26/2021] [Indexed: 11/22/2022]
Abstract
According to the strict European exhaust emissions standards that have been imposed by European legislation there is an elevated need for the decrease of the toxic gas emissions from vehicles. Therefore, car manufacturers have implemented a series of catalytic devices in the aftertreatment of the engine to comply with the standards. All catalytic devices (such as three-way catalysts, diesel particulate filters and diesel oxidation catalysts) accumulate concentrated loading of platinum group metals (PGMs, platinum, palladium, rhodium) as the active catalytic phase. Thus, the demand for PGMs is constantly increasing with a subsequent increase in their market prices. As a result, the research on catalytic converters of high activity and reduced cost/PGM loading is of great interest. In the present work, the Prometheus catalyst, a polymetallic nanosized copper-based catalyst for automotive emission control applications, is presented in two different metal loadings (2 wt% and 5 wt%) and metal ratios (Cu/Pd/Rh = 21/7/1 and Cu/Pd/Rh = 21/7/3). For the first time, a three-metal (copper, palladium, rhodium) nano-catalyst has been synthesized and characterized on a large scale. By using copper as an active catalytic phase, a reduction of PGMs loading is achieved (up to 85%) resulting in a novel catalytic device with similar or improved catalytic performance compared to commercial ones. The Prometheus catalyst is prepared by a wet impregnation method, using as a carrier an inorganic mixed oxide (CeZrO4) exhibiting elevated oxygen storage capacity (OSC). The heterogeneous catalytic powders produced were characterized by both spectroscopic and analytical methods. The metal content and ratio were determined by inductively coupled plasma mass spectrometry (ICP-MS), X-ray fluorescence (XRF) and energy-dispersive X-ray spectroscopy (EDS). The morphology and the catalyst particle size were determined with scanning electron microscopy (SEM) and X-ray diffraction (XRD). The investigation revealed homogeneous particle formation and dispersion. The deposition of the metal nanoparticles on the porous inorganic carrier was verified with N2 sorption. Catalytic performance and reactivity of a catalyst (pure wash coat) with molar ratio 21/7/1 and a full-scale Prometheus catalyst with the desired loading of 15 g/ft3 were tested on an in-house synthetic gas bench (SGB) for the abatement of CO, CH4 and NO, both presenting high catalytic activity.
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29
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Zagoraios D, Tsatsos S, Kennou S, Vayenas CG, Kyriakou G, Katsaounis A. Tuning the RWGS Reaction via EPOC and In Situ Electro-oxidation of Cobalt Nanoparticles. ACS Catal 2020. [DOI: 10.1021/acscatal.0c04133] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dimitrios Zagoraios
- Department of Chemical Engineering, University of Patras, Caratheodory 1 St, 26504 Patras, Greece
| | - Sotirios Tsatsos
- Department of Chemical Engineering, University of Patras, Caratheodory 1 St, 26504 Patras, Greece
| | - Stella Kennou
- Department of Chemical Engineering, University of Patras, Caratheodory 1 St, 26504 Patras, Greece
| | - Constantinos G. Vayenas
- Department of Chemical Engineering, University of Patras, Caratheodory 1 St, 26504 Patras, Greece
- Academy of Athens, Panepistimiou 28 Ave., 10679 Athens, Greece
| | - Georgios Kyriakou
- Department of Chemical Engineering, University of Patras, Caratheodory 1 St, 26504 Patras, Greece
| | - Alexandros Katsaounis
- Department of Chemical Engineering, University of Patras, Caratheodory 1 St, 26504 Patras, Greece
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30
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Parbey J, Wang Q, Yu G, Zhang X, Li T, Andersson M. Progress in the use of electrospun nanofiber electrodes for solid oxide fuel cells: a review. REV CHEM ENG 2020. [DOI: 10.1515/revce-2018-0074] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThe application of one-dimensional nanofibers in the fabrication of an electrode greatly improves the performance of solid oxide fuel cells (SOFCs) due to its advantages on electron transfer and mass transport. Various mixed ionic-electronic conducting materials with perovskites and Ruddlesden-Popper-type metal oxide structures are successfully electrospun into nanofibers in recent years mostly in solvent solution and some in melt forms, which are used as anode and cathode electrodes for SOFCs. This paper presents a comprehensive review of the structure, electrochemical performance, and development of anode and cathode nanofiber electrodes including processing, structure, and property characterization. The focuses are first on the precursor, applied voltage, and polymer in the material electrospinning process, the performance of the fiber, potential limitation and drawbacks, and factors affecting fiber morphology, and sintering temperature for impurity-free fibers. Information on relevant methodologies for cell fabrication and stability issues, polarization resistances, area specific resistance, conductivity, and power densities are summarized in the paper, and technology limitations, research challenges, and future trends are also discussed. The concluded information benefits improvement of the material properties and optimization of microstructure of the electrodes for SOFCs.
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Affiliation(s)
- Joseph Parbey
- School of Materials and Energy, University of Electronic Science and Technology of China, 2006 Xiyuan Ave, West Hi-Tech Zone, 611731 Chengdu, Sichuan, P.R. China
- Department of Energy Systems Engineering, Faculty of Engineering, Koforidua Technical University, P.O. Box KF 981, Koforidua, Ghana
| | - Qin Wang
- School of Materials and Energy, University of Electronic Science and Technology of China, 2006 Xiyuan Ave, West Hi-Tech Zone, 611731 Chengdu, Sichuan, P.R. China
| | - Guangsen Yu
- School of Materials and Energy, University of Electronic Science and Technology of China, 2006 Xiyuan Ave, West Hi-Tech Zone, 611731 Chengdu, Sichuan, P.R. China
| | - Xiaoqiang Zhang
- School of Materials and Energy, University of Electronic Science and Technology of China, 2006 Xiyuan Ave, West Hi-Tech Zone, 611731 Chengdu, Sichuan, P.R. China
| | - Tingshuai Li
- School of Materials and Energy, University of Electronic Science and Technology of China, 2006 Xiyuan Ave, West Hi-Tech Zone, 611731 Chengdu, Sichuan, P.R. China, e-mail:
| | - Martin Andersson
- School of Materials and Energy, University of Electronic Science and Technology of China, 2006 Xiyuan Ave, West Hi-Tech Zone, 611731 Chengdu, Sichuan, P.R. China
- Department of Energy Sciences, Faculty of Engineering, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden
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A Discussion on the Unique Features of Electrochemical Promotion of Catalysis (EPOC): Are We in the Right Path Towards Commercial Implementation? Catalysts 2020. [DOI: 10.3390/catal10111276] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The phenomenon of “Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA)” or “Electrochemical Promotion of Catalysis (EPOC)” has been extensively studied for the last decades. Its main strength, with respect to conventionally promoted catalytic systems, is its capability to modify in-situ the activity and/or selectivity of a catalyst by controlling the supply and removal of promoters upon electrical polarization. Previous reviews have summarized the main achievements in this field from both the scientific and technological points of view. However, to this date no commercial application of the EPOC phenomenon has been developed, although numerous advances have been made on the application of EPOC on catalyst nanostructures (closer to those employed in conventional catalytic systems), and on the development of scaled-up reactors suitable for EPOC application. The main bottleneck for EPOC commercialization is likely the choice of the right chemical process. Therefore, from our point of view, future efforts should focus on coupling the latest EPOC advances with the chemical processes where the EPOC phenomenon offers a competitive advantage, either from an environmental, a practical or an economic point of view. In this article, we discuss some of the most promising cases published to date and suggest future improvement strategies. The considered processes are: (i) ethylene epoxidation with environmentally friendly promoters, (ii) NOx storage and reduction under constant reaction atmosphere, (iii) CH4 steam reforming with in-situ catalyst regeneration, (iv) H2 production, storage and release under fixed temperature and pressure, and (v) EPOC-enhanced electrolysers.
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Nau A, Comminges C, Bion N. Operando Isotopic Exchange in Solid Oxide Fuel Cells: Oxygen-Transport Dependency on Applied Potential. Chemphyschem 2020; 21:2357-2363. [PMID: 32909683 DOI: 10.1002/cphc.202000574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 09/04/2020] [Indexed: 11/09/2022]
Abstract
The oxygen isotopic exchange technique is a powerful tool to investigate the oxygen transport kinetics in an oxide solid. In a solid oxide fuel cell, isotopic surface exchange and diffusion coefficients are classically determined by using the Isotopic Exchange Depth Profiling method followed by ex situ SIMS characterizations. Despite its relevance, the utilization of in situ or operando techniques to measure the isotopic exchange under an electrical bias remains marginal. We developed here a set-up which enables operando monitoring of oxygen exchange in SOFC type cells under polarization. The system has been used for studying the oxygen mobility dependency upon polarization on a symmetrical Pt/YSZ/Pt cell (YSZ: yttria-stabilized zirconia). Homomolecular and heterolytic exchange reactions were undertaken to investigate the oxygen activation step and discriminate the limiting step among the sequence of elementary steps which constitute the oxygen transport process in the SOFC system. Oxygen ions incorporation into the dense ionic conductor was identified to be the rate determining step, and its first order rate constant dependency on applied potential was established.
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Affiliation(s)
- Alexandre Nau
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), University of Poitiers, CNRS, 4 rue Michel Brunet, TSA51106, F86073, Poitiers Cedex 9, France
| | - Clément Comminges
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), University of Poitiers, CNRS, 4 rue Michel Brunet, TSA51106, F86073, Poitiers Cedex 9, France
| | - Nicolas Bion
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), University of Poitiers, CNRS, 4 rue Michel Brunet, TSA51106, F86073, Poitiers Cedex 9, France
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Panaritis C, Zgheib J, Couillard M, Baranova EA. The role of Ru clusters in Fe carbide suppression for the reverse water gas shift reaction over electropromoted Ru/FeO catalysts. Electrochem commun 2020. [DOI: 10.1016/j.elecom.2020.106824] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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34
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Panaritis C, Hajar YM, Treps L, Michel C, Baranova EA, Steinmann SN. Demystifying the Atomistic Origin of the Electric Field Effect on Methane Oxidation. J Phys Chem Lett 2020; 11:6976-6981. [PMID: 32787193 DOI: 10.1021/acs.jpclett.0c01485] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Understanding the role of an electric field on the surface of a catalyst is crucial in tuning and promoting the catalytic activity of metals. Herein, we evaluate the oxidation of methane over a Pt surface with varying oxygen coverage using density functional theory. The latter is controlled by the electrode polarization, giving rise to the non-Faradaic modification of catalytic activity phenomenon. At -1 V, the Pt(111) surface is present, while at 1 V, α-PtO2 on Pt(111) takes over. Our results demonstrate that the alteration of the platinum oxide surface under the influence of an electrochemical potential promotes the catalytic activity of the metal oxides by lowering the activation energy barrier of the reaction.
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Affiliation(s)
- Christopher Panaritis
- Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation (CCRI), University of Ottawa, 161 Louis-Pasteur, Ottawa, Ontario K1N 6N5, Canada
| | - Yasmine M Hajar
- Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation (CCRI), University of Ottawa, 161 Louis-Pasteur, Ottawa, Ontario K1N 6N5, Canada
| | - Laureline Treps
- Université Lyon, ENS de Lyon, CNRS, Université Lyon 1, Laboratoire de Chimie UMR 5182, F-69342, Lyon, France
| | - Carine Michel
- Université Lyon, ENS de Lyon, CNRS, Université Lyon 1, Laboratoire de Chimie UMR 5182, F-69342, Lyon, France
| | - Elena A Baranova
- Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation (CCRI), University of Ottawa, 161 Louis-Pasteur, Ottawa, Ontario K1N 6N5, Canada
| | - Stephan N Steinmann
- Université Lyon, ENS de Lyon, CNRS, Université Lyon 1, Laboratoire de Chimie UMR 5182, F-69342, Lyon, France
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Reddy MV, Julien CM, Mauger A, Zaghib K. Sulfide and Oxide Inorganic Solid Electrolytes for All-Solid-State Li Batteries: A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1606. [PMID: 32824170 PMCID: PMC7466729 DOI: 10.3390/nano10081606] [Citation(s) in RCA: 98] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/08/2020] [Accepted: 08/11/2020] [Indexed: 12/23/2022]
Abstract
Energy storage materials are finding increasing applications in our daily lives, for devices such as mobile phones and electric vehicles. Current commercial batteries use flammable liquid electrolytes, which are unsafe, toxic, and environmentally unfriendly with low chemical stability. Recently, solid electrolytes have been extensively studied as alternative electrolytes to address these shortcomings. Herein, we report the early history, synthesis and characterization, mechanical properties, and Li+ ion transport mechanisms of inorganic sulfide and oxide electrolytes. Furthermore, we highlight the importance of the fabrication technology and experimental conditions, such as the effects of pressure and operating parameters, on the electrochemical performance of all-solid-state Li batteries. In particular, we emphasize promising electrolyte systems based on sulfides and argyrodites, such as LiPS5Cl and β-Li3PS4, oxide electrolytes, bare and doped Li7La3Zr2O12 garnet, NASICON-type structures, and perovskite electrolyte materials. Moreover, we discuss the present and future challenges that all-solid-state batteries face for large-scale industrial applications.
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Affiliation(s)
- Mogalahalli V. Reddy
- Centre of Excellence in Transportation Electrification and Energy Storage (CETEES), Institute of Research Hydro-Québec, 1806, Lionel-Boulet Blvd., Varennes, QC J3X 1S1, Canada;
| | - Christian M. Julien
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, UMR-CNRS 7590, 4 place Jussieu, 75252 Paris, France;
| | - Alain Mauger
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, UMR-CNRS 7590, 4 place Jussieu, 75252 Paris, France;
| | - Karim Zaghib
- Department of Mining and Materials Engineering, McGill University, Wong Building, 3610 University Street, Montreal, QC H3A OC5, Canada
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Panaritis C, Michel C, Couillard M, Baranova EA, Steinmann SN. Elucidating the role of electrochemical polarization on the selectivity of the CO2 hydrogenation reaction over Ru. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136405] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Catalytic and Electrochemical Properties of Ag Infiltrated Perovskite Coatings for Propene Deep Oxidation. Catalysts 2020. [DOI: 10.3390/catal10070729] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This study reports the catalytic properties of Ag nanoparticles dispersed on mixed ionic and electronic conducting layers of LSCF (La0.6Sr0.4Co0.2Fe0.8O3) for propene combustion. A commercial and a synthesized LSCF powder were deposited by screen-printing or spin-coating on dense yttria-stabilized zirconia (YSZ) substrates, an oxygen ion conductor. Equal loadings (50 µg) of Ag nanoparticles were dispersed via drop-casting on the LSCF layers. Electrochemical and catalytic properties have been investigated up to 300 °C with and without Ag in a propene/oxygen feed. The Ag nanoparticles do not influence the electrochemical reduction of oxygen, suggesting that the rate-determining step is the charge transfer at the triple phase boundaries YSZ/LSCF/gas. The anodic electrochemical performances correlate well with the catalytic activity for propene oxidation. This suggests that the diffusion of promoting oxygen ions from YSZ via LSCF grains can take place toward Ag nanoparticles and promote their catalytic activity. The best specific catalytic activity, achieved for a LSCF catalytic layer prepared by screen-printing from the commercial powder, is 800 times higher than that of a pure Ag screen-printed film.
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A Novel Magnetic Immobilized Para-Aminobenzoic Acid-Cu(II) Complex: A Green, Efficient and Reusable Catalyst for Aldol Condensation Reactions in Green Media. Catal Letters 2020. [DOI: 10.1007/s10562-020-03216-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Yentekakis IV, Chu W. Advances in Heterocatalysis by Nanomaterials. NANOMATERIALS 2020; 10:nano10040609. [PMID: 32224925 PMCID: PMC7221995 DOI: 10.3390/nano10040609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 03/18/2020] [Accepted: 03/24/2020] [Indexed: 11/16/2022]
Affiliation(s)
- Ioannis V. Yentekakis
- Physical Chemistry & Chemical Processes Laboratory, School of Environmental Engineering, Technical University of Crete (TUC), 73100-Chania, Crete, Greece
- Correspondence: ; Tel.: +30-28210-37752
| | - Wei Chu
- Key Laboratory of Green Chemistry and Technology of Ministry of Education (MOE), College of Chemical Engineering, Sichuan University, Sichuan 610065, China
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Hajar YM, Boreave A, Caravaca A, Vernoux P, Baranova EA. Isotopic Oxygen Exchange Study to Unravel Noble Metal Oxide/Support Interactions: The Case of RuO
2
and IrO
2
Nanoparticles Supported on CeO
2
, TiO
2
and YSZ. ChemCatChem 2020. [DOI: 10.1002/cctc.201902187] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yasmine M. Hajar
- Department of Chemical and Biological Engineering University of Ottawa 161 Louis-Pasteur Ottawa ON K1N6N5 Canada
| | - Antoinette Boreave
- Univ. Lyon, Université Claude Bernard Lyon 1 CNRS – UMR 5256, IRCELYON 2 avenue A. Einstein 69626 Villeurbanne France
| | - Angel Caravaca
- Univ. Lyon, Université Claude Bernard Lyon 1 CNRS – UMR 5256, IRCELYON 2 avenue A. Einstein 69626 Villeurbanne France
| | - Philippe Vernoux
- Univ. Lyon, Université Claude Bernard Lyon 1 CNRS – UMR 5256, IRCELYON 2 avenue A. Einstein 69626 Villeurbanne France
| | - Elena A. Baranova
- Department of Chemical and Biological Engineering University of Ottawa 161 Louis-Pasteur Ottawa ON K1N6N5 Canada
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Neagu D, Kyriakou V, Roiban IL, Aouine M, Tang C, Caravaca A, Kousi K, Schreur-Piet I, Metcalfe IS, Vernoux P, van de Sanden MCM, Tsampas MN. In Situ Observation of Nanoparticle Exsolution from Perovskite Oxides: From Atomic Scale Mechanistic Insight to Nanostructure Tailoring. ACS NANO 2019; 13:12996-13005. [PMID: 31633907 DOI: 10.1021/acsnano.9b05652] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Understanding and controlling the formation of nanoparticles at the surface of functional oxide supports is critical for tuning activity and stability for catalytic and energy conversion applications. Here, we use a latest generation environmental transmission electron microscope to follow the exsolution of individual nanoparticles at the surface of perovskite oxides, with ultrahigh spatial and temporal resolution. Qualitative and quantitative analysis of the data reveals the atomic scale processes that underpin the formation of the socketed, strain-inducing interface that confers exsolved particles their exceptional stability and reactivity. This insight also enabled us to discover that the shape of exsolved particles can be controlled by changing the atmosphere in which exsolution is carried out, and additionally, this could also produce intriguing heterostructures consisting of metal-metal oxide coupled nanoparticles. Our results not only provide insight into the in situ formation of nanoparticles but also demonstrate the tailoring of nanostructures and nanointerfaces.
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Affiliation(s)
- Dragos Neagu
- School of Engineering , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Vasileios Kyriakou
- Dutch Institute for Fundamental Energy Research (DIFFER) , 5612 AJ Eindhoven , The Netherlands
| | - Ioan-Lucian Roiban
- Univ Lyon, Insa-Lyon , Université Claude Bernard Lyon I, CNRS UMR 5510, Mateis, 7 av Jean Capelle , 69621 Villeurbanne Cedex, France
| | - Mimoun Aouine
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON , 2 avenue A. Einstein , 69626 Villeurbanne , France
| | - Chenyang Tang
- School of Engineering , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Angel Caravaca
- Univ Lyon, Insa-Lyon , Université Claude Bernard Lyon I, CNRS UMR 5510, Mateis, 7 av Jean Capelle , 69621 Villeurbanne Cedex, France
| | - Kalliopi Kousi
- School of Engineering , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Ingeborg Schreur-Piet
- Department of Chemical Engineering & Chemistry , Eindhoven University of Technology , 5600 MB Eindhoven , The Netherlands
| | - Ian S Metcalfe
- School of Engineering , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom
| | - Philippe Vernoux
- Univ Lyon, Insa-Lyon , Université Claude Bernard Lyon I, CNRS UMR 5510, Mateis, 7 av Jean Capelle , 69621 Villeurbanne Cedex, France
| | - Mauritius C M van de Sanden
- Dutch Institute for Fundamental Energy Research (DIFFER) , 5612 AJ Eindhoven , The Netherlands
- Department of Applied Physics , Eindhoven University of Technology , 5600 MB Eindhoven , The Netherlands
| | - Mihalis N Tsampas
- Dutch Institute for Fundamental Energy Research (DIFFER) , 5612 AJ Eindhoven , The Netherlands
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Espinós JP, Rico VJ, González-Cobos J, Sánchez-Valencia JR, Pérez-Dieste V, Escudero C, de Lucas-Consuegra A, González-Elipe AR. Graphene Formation Mechanism by the Electrochemical Promotion of a Ni Catalyst. ACS Catal 2019. [DOI: 10.1021/acscatal.9b03820] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Juan P. Espinós
- Nanotechnology on Surfaces Laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-Universidad de Sevilla), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Victor J. Rico
- Nanotechnology on Surfaces Laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-Universidad de Sevilla), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Jesús González-Cobos
- Institute of Chemical Research of Catalonia (ICIQ), Ave. Paisos Catalans 16, 43007 Tarragona, Spain
| | - Juan R. Sánchez-Valencia
- Nanotechnology on Surfaces Laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-Universidad de Sevilla), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Virginia Pérez-Dieste
- ALBA Synchrotron Light Source, Carres de la Llum 2-26, 08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Carlos Escudero
- ALBA Synchrotron Light Source, Carres de la Llum 2-26, 08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Antonio de Lucas-Consuegra
- Department of Chemical Engineering, School of Chemical Sciences and Technologies, University of Castilla-La Mancha, Avenida Camilo José Cela 12, 13005 Ciudad Real, Spain
| | - Agustín R. González-Elipe
- Nanotechnology on Surfaces Laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-Universidad de Sevilla), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
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Abstract
Important advances have been achieved over the past years in agriculture, industrial technology, energy, and health, which have contributed to human well-being [...]
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Kim MJ, Kim HJ, Lee SJ, Ryu IS, Yoon HC, Lee KB, Jeon SG. Promotion of N2O decomposition by Zr4+-doped CeO2 used as support of Rh catalyst. CATAL COMMUN 2019. [DOI: 10.1016/j.catcom.2019.105764] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability. Catalysts 2019. [DOI: 10.3390/catal9060541] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The thermal sintering under oxidative conditions of Rh nanoparticles supported on oxides characterized by very different oxygen storage capacities (OSC) and labilities was studied at 750 and 850 °C. Under sintering conditions, significant particle growth occurred for Rh/γ-Al2O3 (up to 120% at 850 °C). In striking contrast, Rh/ACZ (alumina–ceria–zirconia) and Rh/CZ (ceria–zirconia) exhibited marked resistance to sintering, and even moderate (ca. −10% at 850 °C) to pronounced (ca. −60% at 850 °C) redispersion of the Rh. A model is proposed based on a double-layer description of metal–support interactions assigned to back-spillover of labile oxygen ions onto the Rh particles, accompanied by trapping of atomic Rh by the resulting surface oxygen vacancies. This model accounts for the observed resistance to sintering and actual redispersion of Rh, consistent with both alternative sintering mechanisms, namely Ostwald ripening (OR) or particle migration and coalescence (PMC).
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Electrochemical promotion of Bi-metallic Ni9Pd core double-shell nanoparticles for complete methane oxidation. J Catal 2019. [DOI: 10.1016/j.jcat.2019.04.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Catalytic Properties of Double Substituted Lanthanum Cobaltite Nanostructured Coatings Prepared by Reactive Magnetron Sputtering. Catalysts 2019. [DOI: 10.3390/catal9040381] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Lanthanum perovskites are promising candidates to replace platinum group metal (PGM), especially regarding catalytic oxidation reactions. We have prepared thin catalytic coatings of Sr and Ag doped lanthanum perovskite by using the cathodic co-sputtering magnetron method in reactive condition. Such development of catalytic films may optimize the surface/bulk ratio to save raw materials, since a porous coating can combine a large exchange surface with the gas phase with an extremely low loading. The sputtering deposition process was optimized to generate crystallized and thin perovskites films on alumina substrates. We found that high Ag contents has a strong impact on the morphology of the coatings. High Ag loadings favor the growth of covering films with a porous wire-like morphology showing a good catalytic activity for CO oxidation. The most active composition displays similar catalytic performances than those of a Pt film. In addition, this porous coating is also efficient for CO and NO oxidation in a simulated Diesel exhaust gas mixture, demonstrating the promising catalytic properties of such nanostructured thin sputtered perovskite films.
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Fop S, McCombie KS, Wildman EJ, Skakle JMS, Mclaughlin AC. Hexagonal perovskite derivatives: a new direction in the design of oxide ion conducting materials. Chem Commun (Camb) 2019; 55:2127-2137. [PMID: 30676598 DOI: 10.1039/c8cc09534e] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various structural families have been reported to support oxide ion conductivity; among these, perovskite conductors have received particular attention. The perovskite structure is generally composed of a framework of corner-sharing octahedral units. When the octahedral units share their faces, hexagonal perovskites are formed. Mixed combinations of corner-sharing and face-sharing octahedral units can give rise to a variety of hexagonal perovskite derivatives. However, the ionic conducting properties of these materials have not been well explored. In this feature article, we review the conducting properties of the most significant hexagonal perovskite derivatives, with special focus on Ba3MM'O8.5. Ba3MM'O8.5 is the first hexagonal perovskite derivative to exhibit substantial oxide ion conductivity, and here we outline the structural features that are key for the oxide ion conduction within this system. The results demonstrate that further investigation of hexagonal perovskite derivatives could open up new directions in the design of oxide ion conductors.
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Affiliation(s)
- Sacha Fop
- Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK.
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Electropositive Promotion by Alkalis or Alkaline Earths of Pt-Group Metals in Emissions Control Catalysis: A Status Report. Catalysts 2019. [DOI: 10.3390/catal9020157] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Recent studies have shown that the catalytic performance (activity and/or selectivity) of Pt-group metal (PGM) catalysts for the CO and hydrocarbons oxidation as well as for the (CO, HCs or H2)-SCR of NOx or N2O can be remarkably affected through surface-induced promotion by successful application of electropositive promoters, such as alkalis or alkaline earths. Two promotion methodologies were implemented for these studies: the Electrochemical Promotion of Catalysis (EPOC) and the Conventional Catalysts Promotion (CCP). Both methodologies were in general found to achieve similar results. Turnover rate enhancements by up to two orders of magnitude were typically achievable for the reduction of NOx by hydrocarbons or CO, in the presence or absence of oxygen. Subsequent improvements (ca. 30–60 additional percentage units) in selectivity towards N2 were also observed. Electropositively promoted PGMs were also found to be significantly more active for CO and hydrocarbons oxidations, either when these reactions occur simultaneously with deNOx reactions or not. The aforementioned direct (via surface) promotion was also found to act synergistically with support-mediated promotion (structural promotion); the latter is typically implemented in TWCs through the complex (Ce–La–Zr)-modified γ-Al2O3 washcoats used. These attractive findings prompt to the development of novel catalyst formulations for a more efficient and cost-effective control of the emissions of automotives and stationary combustion processes. In this report the literature findings in the relevant area are summarized, classified and discussed. The mechanism and the mode of action of the electropositive promoters are consistently interpreted with all the observed promoting phenomena, by means of indirect (kinetics) and direct (spectroscopic) evidences.
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