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Patil SS, Dasari HP. An investigation on copper-loaded ceria-praseodymium catalysts for soot oxidation activity and its kinetics. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2023. [DOI: 10.1007/s43153-023-00312-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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Unveiling the Role of In Situ Sulfidation and H2O Excess onH2S Decomposition to Carbon-Free H2 over Cobalt/Ceria Catalysts. Catalysts 2023. [DOI: 10.3390/catal13030504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023] Open
Abstract
The emerging energy and environmental concerns nowadays are highlighting the need to turn to clean fuels, such as hydrogen. In this regard, hydrogen sulfide (H2S), an abundant chemical compound found in several natural sources and industrial streams, can be considered a potential carbon-free H2 source through its decomposition. In the present work, the H2S decomposition performance of Co3O4/CeO2 mixed oxide catalysts toward hydrogen production is investigated under excess H2O conditions (1 v/v% H2S, 90 v/v% H2O, Ar as diluent), simulating the concentrated H2S-H2O inflow by the Black Sea deep waters. The effect of key operational parameters such as feed composition, temperature (550–850 °C), and cobalt loading (0–100 wt.%) on the catalytic performance of Co3O4/CeO2 catalysts was systematically explored. In order to gain insight into potential structure-performance relationships, various characterization studies involving BET, XRD, SEM/EDX, and sulfur elemental analysis were performed over the fresh and spent samples. The experimental results showed that the 30 wt.% Co/CeO2 catalyst demonstrated the optimum catalytic performance over the entire temperature range with a H2 production rate of ca. 2.1 μmol H2∙g−1·s−1 at 850 °C and a stable behavior after 10 h on stream, ascribed mainly to the in-situ formation of highly active and stable cobalt sulfided phases.
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Fabrication of Pt/Co3O4 nanocatalysts based on pollen template for low-temperature CO oxidation. CATAL COMMUN 2022. [DOI: 10.1016/j.catcom.2022.106597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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Support-induced modifications on the CO2 hydrogenation performance of Ni/CeO2: The effect of ZnO doping on CeO2 nanorods. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Knecht TA, Hutchison JE. Reaction Atmospheres and Surface Ligation Control Surface Reactivity and Morphology of Cerium Oxide Nanocrystals during Continuous Addition Synthesis. Inorg Chem 2022; 61:4690-4704. [DOI: 10.1021/acs.inorgchem.1c03993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tawney A. Knecht
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - James E. Hutchison
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
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Shang Z, Yu Y, Yang H, Yang Z, Xiao Y, Wang X. One-step solution combustion synthesis of micro/nano-scale porous Cu/CeO2 with enhanced photocatalytic properties. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.02.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Patil SS, Naik S, Ramesh MD, Dasari H, Dasari HP. A Negative Effect of Niobium Doped Ceria on Soot Oxidation Activity. Chem Eng Technol 2022. [DOI: 10.1002/ceat.202100523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sunaina S Patil
- Chemical Engineering Department National Institute of Technology Karnataka Surathkal Mangalore 575025 India Karnataka
| | - Sahana Naik
- Chemical Engineering Department National Institute of Technology Karnataka Surathkal Mangalore 575025 India Karnataka
| | - Madhura D Ramesh
- Chemical Engineering Department National Institute of Technology Karnataka Surathkal Mangalore 575025 India Karnataka
| | - Harshini Dasari
- Manipal Academy of Higher Education (MAHE), Chemical Engineering Department Manipal Institute of Technology Manipal Udupi 576104 India Karnataka
| | - Hari Prasad Dasari
- Chemical Engineering Department National Institute of Technology Karnataka Surathkal Mangalore 575025 India Karnataka
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Zhang P, Liu B, Li Y, Chen N, Du Y, Chang W, Yang H, Hong W, Li Y, Yang G. Egg White-Mediated Synthesis and Application of Ag/CeO2 Photocatalyst for Enhanced Photocatalytic Activity under Visible Light Irradiation. RUSS J INORG CHEM+ 2022. [DOI: 10.1134/s0036023621140096] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Papatheodorou G, Ntzoufra P, Hapeshi E, Vakros J, Mantzavinos D. Hybrid Biochar/Ceria Nanomaterials: Synthesis, Characterization and Activity Assessment for the Persulfate-Induced Degradation of Antibiotic Sulfamethoxazole. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:194. [PMID: 35055213 PMCID: PMC8778396 DOI: 10.3390/nano12020194] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/02/2022] [Accepted: 01/05/2022] [Indexed: 12/10/2022]
Abstract
Biochar from spent malt rootlets was employed as the template to synthesize hybrid biochar-ceria materials through a wet impregnation method. The materials were tested for the activation of persulfate (SPS) and subsequent degradation of sulfamethoxazole (SMX), a representative antibiotic, in various matrices. Different calcination temperatures in the range 300-500 °C were employed and the resulting materials were characterized by means of N2 adsorption and potentiometric mass titration as well as TGA, XRD, SEM, FTIR, DRS, and Raman spectroscopy. Calcination temperature affects the biochar content and the physicochemical properties of the hybrid materials, which were tested for the degradation of 500 μg L-1 SMX with SPS (in the range 200-500 mg L-1) in various matrices including ultrapure water (UPW), bottled water, wastewater, and UPW spiked with bicarbonate, chloride, or humic acid. Materials calcined at 300-350 °C, with a surface area of ca. 120 m2 g-1, were the most active, yielding ca. 65% SMX degradation after 120 min of reaction in UPW; materials calcined at higher temperatures as well as bare biochar were less active. Degradation decreased with increasing matrix complexity due to the interactions amongst the surface, the contaminant, and the oxidant. Experiments in the presence of scavengers (i.e., methanol, t-butanol, and sodium azide) revealed that sulfate and hydroxyl radicals as well as singlet oxygen were the main oxidative species.
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Affiliation(s)
- Golfo Papatheodorou
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (G.P.); (P.N.)
| | - Paraskevi Ntzoufra
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (G.P.); (P.N.)
| | - Evroula Hapeshi
- Department of Life and Health Sciences, School of Sciences and Engineering, University of Nicosia, Nicosia 2417, Cyprus;
| | - John Vakros
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (G.P.); (P.N.)
| | - Dionissios Mantzavinos
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece; (G.P.); (P.N.)
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11
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Rational Design of Non-Precious Metal Oxide Catalysts by Means of Advanced Synthetic and Promotional Routes. Catalysts 2021. [DOI: 10.3390/catal11080895] [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] Open
Abstract
Catalysis is an indispensable part of our society, involved in numerous energy and environmental applications, such as the production of value-added chemicals/fuels, hydrocarbons processing, fuel cells applications, abatement of hazardous pollutants, among others [...]
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Shape Effects of Ceria Nanoparticles on the Water‒Gas Shift Performance of CuOx/CeO2 Catalysts. Catalysts 2021. [DOI: 10.3390/catal11060753] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The copper–ceria (CuOx/CeO2) system has been extensively investigated in several catalytic processes, given its distinctive properties and considerable low cost compared to noble metal-based catalysts. The fine-tuning of key parameters, e.g., the particle size and shape of individual counterparts, can significantly affect the physicochemical properties and subsequently the catalytic performance of the binary oxide. To this end, the present work focuses on the morphology effects of ceria nanoparticles, i.e., nanopolyhedra (P), nanocubes (C), and nanorods (R), on the water–gas shift (WGS) performance of CuOx/CeO2 catalysts. Various characterization techniques were employed to unveil the effect of shape on the structural, redox and surface properties. According to the acquired results, the support morphology affects to a different extent the reducibility and mobility of oxygen species, following the trend: R > P > C. This consequently influences copper–ceria interactions and the stabilization of partially reduced copper species (Cu+) through the Cu2+/Cu+ and Ce4+/Ce3+ redox cycles. Regarding the WGS performance, bare ceria supports exhibit no activity, while the addition of copper to the different ceria nanostructures alters significantly this behaviour. The CuOx/CeO2 sample of rod-like morphology demonstrates the best catalytic activity and stability, approaching the thermodynamic equilibrium conversion at 350 °C. The greater abundance in loosely bound oxygen species, oxygen vacancies and highly dispersed Cu+ species can be mainly accounted for its superior catalytic performance.
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Cai D, Chen B, Huang Z, Zeng X, Xiao J, Zhou SF, Zhan G. Metal oxide/CeO 2 nanocomposites derived from Ce-benzene tricarboxylate (Ce-BTC) adsorbing with metal acetylacetonate complexes for catalytic oxidation of carbon monoxide. RSC Adv 2021; 11:21057-21065. [PMID: 35479346 PMCID: PMC9034050 DOI: 10.1039/d1ra03319k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 06/05/2021] [Indexed: 11/21/2022] Open
Abstract
Herein, a series of metal oxide/CeO2 (M/CeO2) nanocomposites derived from Ce-benzene tricarboxylate (Ce-BTC) adsorbing with different metal acetylacetonate complexes were prepared for CO oxidation under four different CO gas atmospheres. It was demonstrated that Cu/CeO2 exhibited the highest catalytic activity and stability in CO oxidation. Remarkably, both O2 selectivity and CO selectivity to CO2 are 100% in most of the investigated conditions. Several analytical tools such as N2 adsorption-desorption and powder X-ray diffraction, were employed to characterize the prepared catalysts. In addition, the excellent catalytic performance of Cu/CeO2 in CO oxidation was revealed by H2 temperature-program reduction experiment, X-ray photoelectron spectroscopy, and in situ diffuse reflectance infrared Fourier transform spectroscopy. The result showed that high oxygen vacancy and high CO adsorption capacity (Cu+-CO) caused by the electron exchanges of Cu2+/Cu+ and Ce3+/Ce4+ pairs (Ce4+ + Cu+ ⇆ Ce3+ + Cu2+) are two key factors contributing to the high oxidation performance of Cu/CeO2 catalyst.
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Affiliation(s)
- Dongren Cai
- College of Chemical Engineering, Huaqiao University 668 Jimei Blvd Xiamen Fujian 361021 P. R. China
| | - Bin Chen
- College of Chemical Engineering, Huaqiao University 668 Jimei Blvd Xiamen Fujian 361021 P. R. China
| | - Zhongliang Huang
- College of Chemical Engineering, Huaqiao University 668 Jimei Blvd Xiamen Fujian 361021 P. R. China
| | - Xiaoli Zeng
- College of Chemical Engineering, Huaqiao University 668 Jimei Blvd Xiamen Fujian 361021 P. R. China
| | - Jingran Xiao
- College of Chemical Engineering, Huaqiao University 668 Jimei Blvd Xiamen Fujian 361021 P. R. China
| | - Shu-Feng Zhou
- College of Chemical Engineering, Huaqiao University 668 Jimei Blvd Xiamen Fujian 361021 P. R. China
| | - Guowu Zhan
- College of Chemical Engineering, Huaqiao University 668 Jimei Blvd Xiamen Fujian 361021 P. R. China
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Facet-Dependent Reactivity of Ceria Nanoparticles Exemplified by CeO2-Based Transition Metal Catalysts: A Critical Review. Catalysts 2021. [DOI: 10.3390/catal11040452] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The rational design and fabrication of highly-active and cost-efficient catalytic materials constitutes the main research pillar in catalysis field. In this context, the fine-tuning of size and shape at the nanometer scale can exert an intense impact not only on the inherent reactivity of catalyst’s counterparts but also on their interfacial interactions; it can also opening up new horizons for the development of highly active and robust materials. The present critical review, focusing mainly on our recent advances on the topic, aims to highlight the pivotal role of shape engineering in catalysis, exemplified by noble metal-free, CeO2-based transition metal catalysts (TMs/CeO2). The underlying mechanism of facet-dependent reactivity is initially discussed. The main implications of ceria nanoparticles’ shape engineering (rods, cubes, and polyhedra) in catalysis are next discussed, on the ground of some of the most pertinent heterogeneous reactions, such as CO2 hydrogenation, CO oxidation, and N2O decomposition. It is clearly revealed that shape functionalization can remarkably affect the intrinsic features and in turn the reactivity of ceria nanoparticles. More importantly, by combining ceria nanoparticles (CeO2 NPs) of specific architecture with various transition metals (e.g., Cu, Fe, Co, and Ni) remarkably active multifunctional composites can be obtained due mainly to the synergistic metalceria interactions. From the practical point of view, novel catalyst formulations with similar or even superior reactivity to that of noble metals can be obtained by co-adjusting the shape and composition of mixed oxides, such as Cu/ceria nanorods for CO oxidation and Ni/ceria nanorods for CO2 hydrogenation. The conclusions derived could provide the design principles of earth-abundant metal oxide catalysts for various real-life environmental and energy applications.
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Surface modification of TiO2 with Pd nanoparticles for enhanced photocatalytic oxidation of benzene micropollutants. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125959] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Xu Y, Mofarah SS, Mehmood R, Cazorla C, Koshy P, Sorrell CC. Design strategies for ceria nanomaterials: untangling key mechanistic concepts. MATERIALS HORIZONS 2021; 8:102-123. [PMID: 34821292 DOI: 10.1039/d0mh00654h] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The morphologies of ceria nanocrystals play an essential role in determining their redox and catalytic performances in many applications, yet the effects of synthesis variables on the formation of ceria nanoparticles of different morphologies and their related growth mechanisms have not been systematised. The design of these morphologies is underpinned by a range of fundamental parameters, including crystallography, optical mineralogy, the stabilities of exposed crystallographic planes, CeO2-x stoichiometry, phase equilibria, thermodynamics, defect equilibria, and the crystal growth mechanisms. These features are formalised and the key analytical methods used for analysing defects, particularly the critical oxygen vacancies, are surveyed, with the aim of providing a source of design parameters for the synthesis of nanocrystals, specifically CeO2-x. However, the most important aspect in the design of CeO2-x nanocrystals is an understanding of the roles of the main variables used for synthesis. While there is a substantial body of data on CeO2-x morphologies fabricated using low cerium concentrations ([Ce]) under different experimental conditions, the present work fully maps the effects of the relevant variables on the resultant CeO2-x morphologies in terms of the commonly used raw materials [Ce] (and [NO3-] in Ce(NO3)3·6H2O) as feedstock, [NaOH] as precipitating agent, temperature, and time (as well as the complementary vapour pressure). Through the combination of consideration of the published literature and the generation of key experimental data to fill in the gaps, a complete mechanistic description of the development of the main CeO2-x morphologies is illustrated. Further, the mechanisms of the conversion of nanochains into the two variants of nanorods, square and hexagonal, have been elucidated through crystallographic reasoning. Other key conclusions for the crystal growth process are the critical roles of (1) the formation of Ce(OH)4 crystallite nanochains as the precursors of nanorods and (2) the disassembly of the nanorods into Ce(OH)4 crystallites and NO3--assisted reassembly into nanocubes (and nanospheres) as an unrecognised intermediate stage of crystal growth.
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Affiliation(s)
- Yuwen Xu
- School of Materials Science and Engineering, UNSW Sydney, Australia.
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Jantarang S, Lovell EC, Tan TH, Xie B, Scott J, Amal R. Altering the influence of ceria oxygen vacancies in Ni/Ce xSi yO 2 for photothermal CO 2 methanation. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00136a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
While the benefit of CeO2 surface oxygen vacancies for CO2 methanation is well established, their role under photothermal conditions has not been probed in depth.
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Affiliation(s)
- Salina Jantarang
- Particles and Catalysis Research Group
- School of Chemical Engineering
- The University of New South Wales
- Sydney
- Australia
| | - Emma C. Lovell
- Particles and Catalysis Research Group
- School of Chemical Engineering
- The University of New South Wales
- Sydney
- Australia
| | - Tze Hao Tan
- Particles and Catalysis Research Group
- School of Chemical Engineering
- The University of New South Wales
- Sydney
- Australia
| | - Bingqiao Xie
- Particles and Catalysis Research Group
- School of Chemical Engineering
- The University of New South Wales
- Sydney
- Australia
| | - Jason Scott
- Particles and Catalysis Research Group
- School of Chemical Engineering
- The University of New South Wales
- Sydney
- Australia
| | - Rose Amal
- Particles and Catalysis Research Group
- School of Chemical Engineering
- The University of New South Wales
- Sydney
- Australia
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Dunn AJA, Annis JW, Fisher JM, Thompsett D, Walton RI. Ce(OH) 2Cl and lanthanide-substituted variants as precursors to redox-active CeO 2 materials. Dalton Trans 2020; 49:14871-14880. [PMID: 33073797 DOI: 10.1039/d0dt03435e] [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 cerium(iii) hydroxide chloride Ce(OH)2Cl crystallises directly as a polycrystalline powder from a solution of CeCl3·7H2O in poly(ethylene) glycol (Mn = 400) heated at 240 °C and is found to be isostructural with La(OH)2Cl, as determined from high-resolution synchrotron powder X-ray diffraction (P21/m, a = 6.2868(2) Å, b = 3.94950(3) Å, c = 6.8740(3) Å, β = 113.5120(5)°). Replacement of a proportion of the cerium chloride in synthesis by a second lanthanide chloride yields a set of materials Ce1-xLnx(OH)2Cl for Ln = La, Pr, Gd, Tb. For La the maximum value of x is 0.2, with an isotropic expansion of the unit cell, but for the other lanthanides a wider composition range is possible, and the lattice parameters show an isotropic contraction with increasing x. Thermal decomposition of the hydroxide chlorides at 700 °C yields mixed-oxides Ce1-xLnxO2-δ that all have cubic fluorite structures with either expanded (Ln = La, Gd) or contracted (Ln = Pr, Tb) unit cells compared to CeO2. Scanning electron microscopy shows a shape memory effect in crystal morphology upon decomposition, with clusters of anisotropic sub-micron crystallites being seen in the precursor and oxide products. The Pr- and Tb-substituted oxides contain the substituent in a mixture of +3 and +4 oxidation states, as seen by X-ray absorption near edge structure spectroscopy at the lanthanide LIII edges. The mixed oxide materials are examined using temperature programmed reduction in 10%H2 in N2, which reveals redox properties suitable for heterogeneous catalysis, with the Pr-substituted materials showing the greatest reducibility at lower temperature.
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Shang Z, Yang Z, Xiao Y, Wang X. Ordered mesoporous Ag/CeO2 nanocrystalline via silica-templated solution combustion for enhanced photocatalytic performance. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125301] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Hydrothermal Synthesis of ZnO–doped Ceria Nanorods: Effect of ZnO Content on the Redox Properties and the CO Oxidation Performance. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10217605] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The rational design of highly efficient, noble metal-free metal oxides is one of the main research priorities in the area of catalysis. To this end, the fine tuning of ceria-based mixed oxides by means of aliovalent metal doping has currently received particular attention due to the peculiar metal-ceria synergistic interactions. Herein, we report on the synthesis, characterization and catalytic evaluation of ZnO–doped ceria nanorods (NR). In particular, a series of bare CeO2 and ZnO oxides along with CeO2/ZnO mixed oxides of different Zn/Ce atomic ratios (0.2, 0.4, 0.6) were prepared by the hydrothermal method. All prepared samples were characterized by X-ray diffraction (XRD), N2 physisorption, temperature-programmed reduction (TPR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). The CO oxidation reaction was employed as a probe reaction to gain insight into structure-property relationships. The results clearly showed the superiority of mixed oxides as compared to bare ones, which could be ascribed to a synergistic ZnO–CeO2 interaction towards an improved reducibility and oxygen mobility. A close correlation between the catalytic activity and oxygen storage capacity (OSC) was disclosed. Comparison with relevant literature studies verifies the role of OSC as a key activity descriptor for reactions following a redox-type mechanism.
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Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions. Catalysts 2020. [DOI: 10.3390/catal10020160] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Catalysis is an indispensable part of our society, massively involved in numerous energy and environmental applications. Although, noble metals (NMs)-based catalysts are routinely employed in catalysis, their limited resources and high cost hinder the widespread practical application. In this regard, the development of NMs-free metal oxides (MOs) with improved catalytic activity, selectivity and durability is currently one of the main research pillars in the area of heterogeneous catalysis. The present review, involving our recent efforts in the field, aims to provide the latest advances—mainly in the last 10 years—on the rational design of MOs, i.e., the general optimization framework followed to fine-tune non-precious metal oxide sites and their surrounding environment by means of appropriate synthetic and promotional/modification routes, exemplified by CuOx/CeO2 binary system. The fine-tuning of size, shape and electronic/chemical state (e.g., through advanced synthetic routes, special pretreatment protocols, alkali promotion, chemical/structural modification by reduced graphene oxide (rGO)) can exert a profound influence not only to the reactivity of metal sites in its own right, but also to metal-support interfacial activity, offering highly active and stable materials for real-life energy and environmental applications. The main implications of size-, shape- and electronic/chemical-adjustment on the catalytic performance of CuOx/CeO2 binary system during some of the most relevant applications in heterogeneous catalysis, such as CO oxidation, N2O decomposition, preferential oxidation of CO (CO-PROX), water gas shift reaction (WGSR), and CO2 hydrogenation to value-added products, are thoroughly discussed. It is clearly revealed that the rational design and tailoring of NMs-free metal oxides can lead to extremely active composites, with comparable or even superior reactivity than that of NMs-based catalysts. The obtained conclusions could provide rationales and design principles towards the development of cost-effective, highly active NMs-free MOs, paving also the way for the decrease of noble metals content in NMs-based catalysts.
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Konsolakis M, Lykaki M, Stefa S, Carabineiro SAC, Varvoutis G, Papista E, Marnellos GE. CO 2 Hydrogenation over Nanoceria-Supported Transition Metal Catalysts: Role of Ceria Morphology (Nanorods versus Nanocubes) and Active Phase Nature (Co versus Cu). NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E1739. [PMID: 31817667 PMCID: PMC6955880 DOI: 10.3390/nano9121739] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 11/28/2019] [Accepted: 12/02/2019] [Indexed: 11/28/2022]
Abstract
In this work we report on the combined impact of active phase nature (M: Co or Cu) and ceria nanoparticles support morphology (nanorods (NR) or nanocubes (NC)) on the physicochemical characteristics and CO2 hydrogenation performance of M/CeO2 composites at atmospheric pressure. It was found that CO2 conversion followed the order: Co/CeO2 > Cu/CeO2 > CeO2, independently of the support morphology. Co/CeO2 catalysts demonstrated the highest CO2 conversion (92% at 450 °C), accompanied by 93% CH4 selectivity. On the other hand, Cu/CeO2 samples were very selective for CO production, exhibiting 52% CO2 conversion and 95% CO selectivity at 380 °C. The results obtained in a wide range of H2:CO2 ratios (1-9) and temperatures (200-500 °C) are reaching in both cases the corresponding thermodynamic equilibrium conversions, revealing the superiority of Co- and Cu-based samples in methanation and reverse water-gas shift (rWGS) reactions, respectively. Moreover, samples supported on ceria nanocubes exhibited higher specific activity (µmol CO2·m-2·s-1) compared to samples of rod-like shape, disclosing the significant role of support morphology, besides that of metal nature (Co or Cu). Results are interpreted on the basis of different textural and redox properties of as-prepared samples in conjunction to the different impact of metal entity (Co or Cu) on CO2 hydrogenation process.
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Affiliation(s)
- Michalis Konsolakis
- School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Greece; (M.L.); (S.S.)
| | - Maria Lykaki
- School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Greece; (M.L.); (S.S.)
| | - Sofia Stefa
- School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Greece; (M.L.); (S.S.)
| | - Sόnia A. C. Carabineiro
- Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal
| | - Georgios Varvoutis
- Department of Mechanical Engineering, University of Western Macedonia, GR-50100 Kozani, Greece; (G.V.); (E.P.); (G.E.M.)
- Chemical Process & Energy Resources Institute, Centre for Research & Technology Hellas, GR-57001 Thermi, Thessaloniki, Greece
| | - Eleni Papista
- Department of Mechanical Engineering, University of Western Macedonia, GR-50100 Kozani, Greece; (G.V.); (E.P.); (G.E.M.)
| | - Georgios E. Marnellos
- Department of Mechanical Engineering, University of Western Macedonia, GR-50100 Kozani, Greece; (G.V.); (E.P.); (G.E.M.)
- Chemical Process & Energy Resources Institute, Centre for Research & Technology Hellas, GR-57001 Thermi, Thessaloniki, Greece
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23
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Precursor and dispersion effects of active species on the activity of Mn-Ce-Ti catalysts for NO abatement. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-019-0410-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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24
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Ye J, Cheng DG, Chen F, Zhan X. Controlled Synthesis of Sintering-Resistant Pd@CeO2 Core–Shell Nanotube Catalysts for CO Oxidation. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04697] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jingrui Ye
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, Zhejiang, China
| | - Dang-guo Cheng
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, Zhejiang, China
- Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Quzhou 324000, Zhejiang, China
| | - Fengqiu Chen
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, Zhejiang, China
- Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Quzhou 324000, Zhejiang, China
| | - Xiaoli Zhan
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, Zhejiang, China
- Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Quzhou 324000, Zhejiang, China
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25
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Eaimsumang S, Wongkasemjit S, Pongstabodee S, Smith SM, Ratanawilai S, Chollacoop N, Luengnaruemitchai A. Effect of synthesis time on morphology of CeO2 nanoparticles and Au/CeO2 and their activity in oxidative steam reforming of methanol. J RARE EARTH 2019. [DOI: 10.1016/j.jre.2018.11.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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The Effect of CeO2 Preparation Method on the Carbon Pathways in the Dry Reforming of Methane on Ni/CeO2 Studied by Transient Techniques. Catalysts 2019. [DOI: 10.3390/catal9070621] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The present work discusses the effect of CeO2 synthesis method (thermal decomposition (TD), precipitation (PT), hydrothermal (HT), and sol-gel (SG)) on the carbon pathways of dry reforming of methane with carbon dioxide (DRM) applied at 750 °C over 5 wt% Ni/CeO2. In particular, specific transient and isotopic experiments (use of 13CO, 13CO2, and 18O2) were designed and conducted in an attempt at providing insights about the effect of support’s preparation method on the concentration (mg gcat−1), reactivity towards oxygen, and transient evolution rates (μmol gcat−1 s−1) of the inactive carbon formed under (i) CH4/He (methane decomposition), (ii) CO/He (reverse Boudouard reaction), and (iii) the copresence of the two (CH4/CO/He, use of 13CO). Moreover, important information regarding the relative contribution of CH4 and CO2 activation routes towards carbon formation under DRM reaction conditions was derived by using isotopically labelled 13CO2 in the feed gas stream. Of interest was also the amount, and the transient rate, of carbon removal via the participation of support’s labile active oxygen species.
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27
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Kim BH, Kullgren J, Wolf MJ, Hermansson K, Broqvist P. Multiscale Modeling of Agglomerated Ceria Nanoparticles: Interface Stability and Oxygen Vacancy Formation. Front Chem 2019; 7:203. [PMID: 31179263 PMCID: PMC6538807 DOI: 10.3389/fchem.2019.00203] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 03/18/2019] [Indexed: 02/02/2023] Open
Abstract
The interface formation and its effect on redox processes in agglomerated ceria nanoparticles (NPs) have been investigated using a multiscale simulation approach with standard density functional theory (DFT), the self-consistent-charge density functional tight binding (SCC-DFTB) method, and a DFT-parameterized reactive force-field (ReaxFF). In particular, we have modeled Ce40O80 NP pairs, using SCC-DFTB and DFT, and longer chains and networks formed by Ce40O80 or Ce132O264 NPs, using ReaxFF molecular dynamics simulations. We find that the most stable {111}/{111} interface structure is coherent whereas the stable {100}/{100} structures can be either coherent or incoherent. The formation of {111}/{111} interfaces is found to have only a very small effect on the oxygen vacancy formation energy, Evac. The opposite holds true for {100}/{100} interfaces, which exhibit significantly lower Evac values than the bare surfaces, despite the fact that the interface formation eliminates reactive {100} facets. Our results pave the way for an increased understanding of ceria NP agglomeration.
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Affiliation(s)
- Byung-Hyun Kim
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden.,Platform Technology Laboratory, Korea Institute of Energy Research, Daejeon, South Korea
| | - Jolla Kullgren
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
| | - Matthew J Wolf
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
| | - Kersti Hermansson
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
| | - Peter Broqvist
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
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28
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Liu Z, Li J, Buettner M, Ranganathan RV, Uddi M, Wang R. Metal-Support Interactions in CeO 2- and SiO 2-Supported Cobalt Catalysts: Effect of Support Morphology, Reducibility, and Interfacial Configuration. ACS APPLIED MATERIALS & INTERFACES 2019; 11:17035-17049. [PMID: 30977630 DOI: 10.1021/acsami.9b02455] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
With the increasing demand for highly efficient and durable catalysts, researchers have been doing extensive research to engineer the shape, size, and even phase (e.g., hcp or fcc Co) of individual catalyst nanoparticles, as well as the interface structure between the catalyst and support. In this work, cobalt oxides were deposited on ceria with rod-like morphology (CeO2NR) and cube-like morphology (CeO2NC) and silica with sphere-like morphology (SiO2NS) via a precipitation-deposition method to investigate the effects of support morphology, surface defects, support reducibility, and the metal-support interactions on redox and catalytic properties. XRD, Raman, XPS, BET, H2-TPR, O2-TPD, CO-TPD, TEM, and TPR/TPO cycling measurements have been mainly employed for catalysts characterization. Compared with CeO2NC and SiO2NS supports, as well as CeO2NC- and SiO2NS-supported cobalt catalysts, CeO2NR counterparts exhibited enhanced reducibility and CO oxidation performance at a lower temperature. Both the apparent activation energy and CO conversion demonstrated the following catalytic activity order: 10 wt % CoO x/CeO2NR > 10 wt % CoO x/CeO2NC > 10 wt % CoO x/SiO2NS. These results showed a strong support-dependent reducibility, CO oxidation, and redox cycling activity/stability of the as-prepared catalysts. Moreover, the significantly enhanced catalytic CO oxidation of the 10 wt % CoO x/CeO2NR catalyst indicated the vital role of CeO2NR support with rich surface oxygen vacancies, superior oxygen storage capacity and mobility, and excellent adsorption/desorption behavior of CO and O2 species.
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Abstract
Transition metal oxides have recently attracted considerable attention as candidate catalysts for the complete oxidation of methane, the main component of the natural gas, used in various industrial processes or as a fuel in turbines and vehicles. A series of novel Co-Ce mixed oxide catalysts were synthesized as an effort to enhance synergistic effects that could improve their redox behavior, oxygen storage ability and, thus, their activity in methane oxidation. The effect of synthesis method (hydrothermal or precipitation) and Co loading (0, 2, 5, and 15 wt.%) on the catalytic efficiency and stability of the derived materials was investigated. Use of hydrothermal synthesis results in the most efficient Co/CeO2 catalysts, a fact related with their improved physicochemical properties, as compared with the materials prepared via precipitation. In particular, a CeO2 support of smaller crystallite size and larger surface area seems to enhance the reducibility of the Co3O4/CeO2 materials, as evidenced by the blue shift of the corresponding reduction peaks (H2-TPR, H2-Temperature Programmed Reduction). The limited methane oxidation activity over pure CeO2 samples is significantly enhanced by Co incorporation and further improved by higher Co loadings. The optimum performance was observed over a 15 wt% Co/CeO2 catalyst, which also presented sufficient tolerance to water presence.
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30
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Abstract
Copper-cerium mixed oxide catalysts have gained ground over the years in the field of heterogeneous catalysis and especially in CO oxidation reaction due to their remarkable performance. In this study, a series of highly active, atomically dispersed copper-ceria nanocatalysts were synthesized via appropriate tuning of a novel hydrothermal method. Various physicochemical techniques including electron paramagnetic resonance (EPR) spectroscopy, X-ray diffraction (XRD), N2 adsorption, scanning electron microscopy (SEM), Raman spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) were employed in the characterization of the synthesized materials, while all the catalysts were evaluated in the CO oxidation reaction. Moreover, discussion of the employed mechanism during hydrothermal route was provided. The observed catalytic activity in CO oxidation reaction was strongly dependent on the nanostructured morphology, oxygen vacancy concentration, and nature of atomically dispersed Cu2+ clusters.
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31
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Vale A, Pereira P, Barbosa A, Torrado E, Alves N. Optimization of silver-containing bioglass nanoparticles envisaging biomedical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 94:161-168. [DOI: 10.1016/j.msec.2018.09.027] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 07/28/2018] [Accepted: 09/07/2018] [Indexed: 01/23/2023]
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32
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Cimino S, Lisi L, Totarella G, Barison S, Musiani M, Verlato E. Highly stable core–shell Pt-CeO2 nanoparticles electrochemically deposited onto Fecralloy foam reactors for the catalytic oxidation of CO. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.06.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Hierarchical Structure and Catalytic Activity of Flower-Like CeO₂ Spheres Prepared Via a Hydrothermal Method. NANOMATERIALS 2018; 8:nano8100773. [PMID: 30274299 PMCID: PMC6215204 DOI: 10.3390/nano8100773] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 09/14/2018] [Accepted: 09/25/2018] [Indexed: 11/16/2022]
Abstract
Hierarchical CeO₂ particles were synthesized by a hydrothermal method based on the reaction between CeCl₃·7H₂O and PVP at 270 °C. The flower-like CeO₂ with an average diameter of about 1 μm is composed of compact nanosheets with thicknesses of about 15 nm and have a surface area of 36.8 m²/g, a large pore volume of 0.109 cm³/g, and a narrow pore size distribution (14.9 nm in diameter). The possible formation mechanism of the hierarchical CeO₂ nanoparticles has been illustrated. The 3D hierarchical structured CeO₂ exhibited a higher catalytic activity toward CO oxidation compared with commercial CeO₂.
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34
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Bhalkikar A, Wu TS, Marin CM, Fisher TJ, Wang M, Wells IH, Sarella A, Soo YL, Cheung CL. Ozone-mediated synthesis of ceria nanoparticles. NANOSCALE 2018; 10:9822-9829. [PMID: 29770828 DOI: 10.1039/c8nr01971a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report a rapid, room temperature methodology to synthesize fluorite-structured ceria nanoparticles using cerium(iii) salts and ozone in the presence of short chain primary, secondary, and tertiary alcohols. This simple technique produced nanoparticles with higher oxygen vacancy compared to that of bulk ceria.
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Affiliation(s)
- Anuja Bhalkikar
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.
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35
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Anantharaman AP, J G, P MR, Dasari HP, Lee JH, Dasari H, Bhaskar Babu GU. Ceria-samarium binary metal oxides: A comparative approach towards structural properties and soot oxidation activity. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2018.01.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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36
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Khataee A, Gholami P, Kalderis D, Pachatouridou E, Konsolakis M. Preparation of novel CeO 2-biochar nanocomposite for sonocatalytic degradation of a textile dye. ULTRASONICS SONOCHEMISTRY 2018; 41:503-513. [PMID: 29137781 DOI: 10.1016/j.ultsonch.2017.10.013] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2017] [Revised: 10/14/2017] [Accepted: 10/14/2017] [Indexed: 05/18/2023]
Abstract
The sonocatalytic performance of CeO2 nanoparticles synthesized by a hydrothermal method (CeO2-H) and CeO2@biochar (CeO2-H@BC) nanocomposite, were evaluated for the degradation of Reactive Red 84 (RR84) under ultrasonic irradiation. For comparison purposes the corresponding performance of bare biochar (BC) and commercial CeO2 (CeO2-C) samples were also assessed. A complementary characterization study, involving scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD), N2 adsorption at -196°C (Brunauer-Emmett-Teller (BET) method) and Fourier transform infrared spectroscopy (FT-IR) was undertaken to gain insight into the structure-performance relationships. The effect of various parameters such as initial RR84 concentration, solution pH, catalyst amount and ultrasonic power on the sonodegradation of RR84 was studied in detail. The results indicated that the CeO2-H@BC nanocomposite exhibited the best RR84 degradation efficiency, which is enhanced with the increase of CeO2-H@BC amount and ultrasonic power but diminished with the increment in RR84 concentration and pH value. A 98.5% degradation was obtained with a CeO2-H@BC amount of 1g/L, ultrasonic power of 450 W, pH of 6.5 and initial RR84 concentration of 10mg/L. The quenching effects of various scavengers proposed that OH radical plays the key role in the process. Analyses of intermediates by Gas chromatography-Mass spectroscopy (GC-MS) identified several by-products and accordingly the main pathway was proposed.
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Affiliation(s)
- Alireza Khataee
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran; Department of Materials Science and Nanotechnology Engineering, Near East University, 99138 Nicosia, North Cyprus, Mersin 10, Turkey.
| | - Peyman Gholami
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran
| | - Dimitrios Kalderis
- Department of Environmental and Natural Resources Engineering, School of Applied Sciences, Technological and Educational Institute of Crete, 73100 Chania, Crete, Greece
| | - Eleni Pachatouridou
- Chemical Process & Energy Resources Institute (CPERI), Centre for Research & Technology Hellas (CERTH), 6th km. Charilaou-Thermi Rd., P.O. Box 60361, GR-57001, Thermi, Thessaloniki, Greece; School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Crete, Greece
| | - Michalis Konsolakis
- School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Crete, Greece
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37
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Lykaki M, Papista E, Carabineiro SAC, Tavares PB, Konsolakis M. Optimization of N2O decomposition activity of CuO–CeO2 mixed oxides by means of synthesis procedure and alkali (Cs) promotion. Catal Sci Technol 2018. [DOI: 10.1039/c8cy00316e] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fine-tuning of CuO–CeO2 mixed oxides by means of synthesis procedure (co-precipitation) and alkali promotion (1.0 at Cs per nm2) towards highly active deN2O catalysts is demonstrated.
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Affiliation(s)
- Maria Lykaki
- School of Production Engineering and Management
- Technical University of Crete
- GR-73100 Chania
- Greece
| | - Eleni Papista
- Department of Mechanical Engineering
- University of Western Macedonia
- GR-50100 Kozani
- Greece
| | - Sónia A. C. Carabineiro
- Laboratório de Catálise e Materiais (LCM)
- Laboratório Associado LSRE-LCM
- Faculdade de Engenharia
- Universidade do Porto
- 4200-465 Porto
| | - Pedro B. Tavares
- CQVR Centro de Química – Vila Real
- Departamento de Química
- Universidade de Trás-os-Montes e Alto Douro
- 5001-801 Vila Real
- Portugal
| | - Michalis Konsolakis
- School of Production Engineering and Management
- Technical University of Crete
- GR-73100 Chania
- Greece
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38
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Carabineiro S, Papista E, Marnellos G, Tavares P, Maldonado-Hódar F, Konsolakis M. Catalytic decomposition of N 2 O on inorganic oxides: Εffect of doping with Au nanoparticles. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.04.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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39
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Affiliation(s)
- Alessandro Trovarelli
- Dipartimento
Politecnico, Università di Udine, via del Cotonificio 108, 33100 Udine, Italy
| | - Jordi Llorca
- Institute
of Energy Technologies, Department of Chemical Engineering and Barcelona
Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Eduard Maristany 10-14, 08019 Barcelona, Spain
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