1
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Morishita M, Miyoshi H, Kawasaki H, Yanagita H. Stabilisation of solid-state cubic ammonia confined in a glass substance at ambient temperature under atmospheric pressure. RSC Adv 2024; 14:16128-16137. [PMID: 38769953 PMCID: PMC11103458 DOI: 10.1039/d4ra00229f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Accepted: 05/08/2024] [Indexed: 05/22/2024] Open
Abstract
Ammonia, a widely available compound, exhibits structural transitions from solid to liquid to gas depending on temperature, pressure, and chemical interactions with adjacent atoms, offering valuable insights into planetary science. It serves as a significant hydrogen storage medium in environmental science, mitigating carbon dioxide emissions from fossil fuels. However, its gaseous form, NH3(g), poses health risks, potentially leading to fatalities. The sublimation pressure (psub) of solid cubic ammonia, NH3(cr), below 195.5 K is minimal. In this study, we endeavoured to stabilise NH3(cr) at room temperature for the first time. Through confinement within a boric acid glass matrix, we successfully synthesised and stabilised cubic crystal NH3(cr) with a lattice constant of 0.5165 nm under atmospheric pressure. Thermodynamic simulations affirmed the stabilisation of NH3(cr), indicating its quasi-equilibrium state based on the estimated standard Gibbs energy of formation, . Despite these advancements, the extraction of H2(g) from NH3(cr) within the boric acid glass matrix remains unresolved. The quest for an external matrix with catalytic capabilities to decompose inner NH3(cr) into H2(g) and N2(g) presents a promising avenue for future research. Achieving stability of the low-temperature phase at ambient conditions could significantly propel exploration in this field.
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Affiliation(s)
- Masao Morishita
- National Institute of Materials Science (NIMS) (Formerly Department of Chemical Engineering and Materials Science), University of Hyogo Japan
| | - Hayate Miyoshi
- Department of Chemical Engineering and Materials Science, University of Hyogo Japan
| | - Haruto Kawasaki
- Department of Chemical Engineering and Materials Science, University of Hyogo Japan
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2
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Yao Y, Lv SY, Li G, Yang LM. Electrochemical ammonia synthesis under ambient conditions using TM-embedded porphine-fused sheets as single-atom catalysts. Phys Chem Chem Phys 2023; 25:27131-27141. [PMID: 37721478 DOI: 10.1039/d3cp03073c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2023]
Abstract
In this research, we systematically investigated the reaction mechanism and electrocatalytic properties of transition metal anchored two-dimensional (2D) porphine-fused sheets (TM-Por) as novel single-atom catalysts (SACs) for the electrochemical nitrogen reduction reaction (eNRR) under ambient conditions. Using high-throughput screening and first-principles calculations based on the density functional theory (DFT) method, three eNRR catalyst candidates, i.e. Mo-Por, Tc-Por, and Nb-Por, were screened out, with the eNRR onset potentials on them being -0.36, -0.53, and -0.74 V, respectively. Furthermore, these catalyst candidates all have good stability and selectivity. Analyzing the band structures found that these catalyst candidates all are metallic, which is needed for good electrocatalysts. Ab initio molecular dynamics (AIMD) simulations show that these catalyst candidates have good stability at 500 K. It is hoped that our work will open up new possibilities for the experimental synthesis of electrochemical ammonia catalysts.
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Affiliation(s)
- Ying Yao
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, China.
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Sheng-Yao Lv
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, China.
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Guoliang Li
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, China.
| | - Li-Ming Yang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
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3
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Zhang Q, Li Q, Li H, Shi X, Zhou Y, Ye Q, Yang R, Li D, Jiang D. Synergistic Effects of the Ni 3B Cocatalyst and N Vacancy on g-C 3N 4 for Effectively Enhanced Photocatalytic N 2 Fixation. Inorg Chem 2023; 62:12138-12147. [PMID: 37458415 DOI: 10.1021/acs.inorgchem.3c01741] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
The photocatalytic fixation of N2 is a promising technology for sustainable production of ammonia, while the unsatisfactory efficiency resulting from the low electron-transfer rate, narrow light absorption range, and limited active sites of the photocatalyst seriously hinder its application. Herein, we designed a noble metal-free Schottky junction photocatalyst constructed by g-C3N4 nanosheets with N vacancies (VN-CN) and metallic Ni3B nanoparticles (Ni3B/VN-CN) for N2 reduction to ammonia. The ammonia yield rate over the optimized Ni3B/VN-CN is 7.68 mM g-1 h-1, which is 6.7 times higher than that of pristine CN (1.15 mM g-1 h-1). The superior photocatalytic N2 fixation performance of Ni3B/VN-CN can be attributed not only to the formation of Schottky junctions between Ni3B and VN-CN, which facilitates the migration and separation of photogenerated electrons, but also to the incorporation of VN into g-C3N4, which enhances visible light absorption and improves electrical conductivity. More importantly, Ni3B nanoparticles can act as the cocatalyst, which provide more active sites for the adsorption and activation of N2, thereby improving the N2 reduction activity. This work provides an effective strategy of designing noble metal-free-based cocatalyst photocatalyst for sustainable and economic N2 fixation.
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Affiliation(s)
- Qiong Zhang
- Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
| | - Qin Li
- Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
| | - Heng Li
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Xiangli Shi
- Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
| | - Yimeng Zhou
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Qianjin Ye
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Ran Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Di Li
- Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
| | - Deli Jiang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
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4
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Chen S, Wang Y, Li Q, Li K, Li M, Wang F. A DFT study of plasma-catalytic ammonia synthesis: the effect of electric fields, excess electrons and catalyst surfaces on N 2 dissociation. Phys Chem Chem Phys 2023; 25:3920-3929. [PMID: 36648094 DOI: 10.1039/d2cp05052h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Plasma catalytic synthesis of ammonia has the advantages of flexible on-off and environmental friendliness, making ammonia a potential vector for renewable energy storage. The synergistic interaction between plasmas and catalyst surfaces remains unclear. In this work, we develop a quantum chemical model based on density functional theory where the plasma environment is simplified. The effect of electric fields and surface electrons on N2 adsorption and dissociation is studied on the typical catalysts (Ru and Ni) with different surface morphologies. The combined effect of the electric fields and excess electrons will promote the adsorption of N2 and the weakening of the NN triple bond. It is shown that the electron distribution on the surface is optimized, and the electrostatic interaction between surface atoms and adsorbates is strengthened. The marginal effect has been observed, and the promotion effect on the catalysts with better performance in thermal-catalytic N2 dissociation is weaker.
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Affiliation(s)
- She Chen
- College of Electrical and Information Engineering, Hunan University, 410082, Changsha, People's Republic of China.
| | - Yulei Wang
- College of Electrical and Information Engineering, Hunan University, 410082, Changsha, People's Republic of China. .,State Grid Zhejiang Provincial Electric Power Co., Ltd. Taizhou Power Supply Company, 318000, Taizhou, People's Republic of China
| | - Qihang Li
- College of Electrical and Information Engineering, Hunan University, 410082, Changsha, People's Republic of China.
| | - Kelin Li
- College of Electrical and Information Engineering, Hunan University, 410082, Changsha, People's Republic of China.
| | - Mengbo Li
- College of Electrical and Information Engineering, Hunan University, 410082, Changsha, People's Republic of China.
| | - Feng Wang
- College of Electrical and Information Engineering, Hunan University, 410082, Changsha, People's Republic of China.
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5
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Fan H, Folke JM, Liu Z, Girgsdies F, Imlau R, Ruland H, Heumann S, Granwehr J, Eichel RA, Schlögl R, Frei E, Huang X. Ultrathin 2D Fe-Nanosheets Stabilized by 2D Mesoporous Silica: Synthesis and Application in Ammonia Synthesis. ACS APPLIED MATERIALS & INTERFACES 2021; 13:30187-30197. [PMID: 34129331 PMCID: PMC8397249 DOI: 10.1021/acsami.1c06771] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 06/02/2021] [Indexed: 06/12/2023]
Abstract
Developing high-performance Fe-based ammonia catalysts through simple and cost-efficient methods has received an increased level of attention. Herein, we report for the first time, the synthesis of two-dimensional (2D) FeOOH nanoflakes encapsulated by mesoporous SiO2 (mSiO2) via a simple solution-based method for ammonia synthesis. Due to the sticking of the mSiO2 coating layers and the limited spaces in between, the Fe after reduction retains the 2D morphology, showing high resistance against the sintering in the harsh Haber-Bosch process. Compared to supported Fe particles dispersed on mSiO2 spheres, the coated catalyst shows a significantly improved catalytic activity by 50% at 425 °C. Thermal desorption spectroscopy (TDS) reveals the existence of a higher density of reactive sites for N2 activation in the 2D Fe catalyst, which is possibly coupled to a larger density of surface defect sites (kinks, steps, point defects) that are generally considered as active centers in ammonia synthesis. Besides the structural impact of the coating on the 2D Fe, the electronic one is elucidated by partially substituting Si with Al in the coating, confirmed by 29Si and 27Al magic-angle spinning nuclear magnetic resonance (MAS NMR). An increased apparent activation energy (Ea) of the Al-containing catalyst evidences an influence on the nature of the active site. The herein-developed stable 2D Fe nanostructures can serve as an example of a 2D material applied in catalysis, offering the chance of a rational catalyst design based on a stepwise introduction of various promoters, in the coating and on the metal, maintaining the spatial control of the active centers.
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Affiliation(s)
- Hua Fan
- Department
of Heterogeneous Reactions, Max Planck Institute
for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
- Department
of Inorganic Chemistry, Fritz-Haber Institute
of Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
- Fuzhou
University, Wulong River North Street No.2, 350108 Fuzhou, P. R. China
| | - Jan Markus Folke
- Department
of Heterogeneous Reactions, Max Planck Institute
for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
| | - Zigeng Liu
- Department
of Heterogeneous Reactions, Max Planck Institute
for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
- Institute
of Energy and Climate Research - Fundamental Electrochemistry (IEK-9),
Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Frank Girgsdies
- Department
of Inorganic Chemistry, Fritz-Haber Institute
of Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Robert Imlau
- Materials
& Structural Analysis, Thermo Fisher
Scientific, Achtseweg
Noord 5, 5651 GG Eindhoven, Netherlands
| | - Holger Ruland
- Department
of Heterogeneous Reactions, Max Planck Institute
for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
| | - Saskia Heumann
- Department
of Heterogeneous Reactions, Max Planck Institute
for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
| | - Josef Granwehr
- Institute
of Energy and Climate Research - Fundamental Electrochemistry (IEK-9),
Forschungszentrum Jülich, 52425 Jülich, Germany
- Institute
of Technical and Macromolecular Chemistry, RWTH Aachen University, 52074 Aachen, Germany
| | - Rüdiger-A. Eichel
- Institute
of Energy and Climate Research - Fundamental Electrochemistry (IEK-9),
Forschungszentrum Jülich, 52425 Jülich, Germany
- Institute
of Physical Chemistry, RWTH Aachen University, 52074 Aachen, Germany
| | - Robert Schlögl
- Department
of Heterogeneous Reactions, Max Planck Institute
for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
- Department
of Inorganic Chemistry, Fritz-Haber Institute
of Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Elias Frei
- Department
of Inorganic Chemistry, Fritz-Haber Institute
of Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Xing Huang
- Department
of Heterogeneous Reactions, Max Planck Institute
for Chemical Energy Conversion, 45470 Mülheim an der Ruhr, Germany
- Department
of Inorganic Chemistry, Fritz-Haber Institute
of Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
- Fuzhou
University, Wulong River North Street No.2, 350108 Fuzhou, P. R. China
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6
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Hisai Y, Ma Q, Qureishy T, Watanabe T, Higo T, Norby T, Sekine Y. Enhanced activity of catalysts on substrates with surface protonic current in an electrical field - a review. Chem Commun (Camb) 2021; 57:5737-5749. [PMID: 34027532 DOI: 10.1039/d1cc01551f] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
It has over the last few years been reported that the application of a DC electric field and resulting current over a bed of certain catalyst-support systems enhances catalytic activity for several reactions involving hydrogen-containing reactants, and the effect has been attributed to surface protonic conductivity on the porous ceramic support (typically ZrO2, CeO2, SrZrO3). Models for the nature of the interaction between the protonic current, the catalyst particle (typically Ru, Ni, Co, Fe), and adsorbed reactants such as NH3 and CH4 have developed as experimental evidence has emerged. Here, we summarize the electrical enhancement and how it enhances yield and lowers reaction temperatures of industrially important chemical processes. We also review the nature of the relevant catalysts, support materials, as well as essentials and recent progress in surface protonics. It is easily suspected that the effect is merely an increase in local vs. nominal set temperature due to the ohmic heating of the electrical field and current. We address this and add data from recent studies of ours that indicate that the heating effect is minor, and that the novel catalytic effect of a surface protonic current must have additional causes.
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Affiliation(s)
- Yudai Hisai
- Department of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan.
| | - Quanbao Ma
- Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway.
| | - Thomas Qureishy
- Department of Chemistry, Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, P.O. Box 1033 Blindern, NO-0315 Oslo, Norway
| | | | - Takuma Higo
- Department of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan.
| | - Truls Norby
- Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway.
| | - Yasushi Sekine
- Department of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan.
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7
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Murakami K, Mizutani Y, Sampei H, Ishikawa A, Tanaka Y, Hayashi S, Doi S, Higo T, Tsuneki H, Nakai H, Sekine Y. Theoretical prediction by DFT and experimental observation of heterocation-doping effects on hydrogen adsorption and migration over the CeO 2(111) surface. Phys Chem Chem Phys 2021; 23:4509-4516. [PMID: 33523062 DOI: 10.1039/d0cp05752e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Hydrogen (H) atom adsorption and migration over the CeO2-based materials surface are of great importance because of its wide applications to catalytic reactions and electrochemical devices. Therefore, comprehensive knowledge for controlling the H atom adsorption and migration over CeO2-based materials is crucially important. For controlling H atom adsorption and migration, we investigated irreducible divalent, trivalent, and quadrivalent heterocation-doping effects on H atom adsorption and migration over the CeO2(111) surface using density functional theory (DFT) calculations. Results revealed that the electron-deficient lattice oxygen (Olat) and the flexible CeO2 matrix played key roles in strong adsorption of H atoms. Heterocations with smaller valence and smaller ionic radius induced the electron-deficient Olat. In addition, smaller cation doping enhanced the CeO2 matrix flexibility. Moreover, we confirmed the influence of H atom adsorption controlled by doping on surface proton migration (i.e. surface protonics) and catalytic reaction involving surface protonics (NH3 synthesis in an electric field). Results confirmed clear correlation between H atom adsorption energy and surface protonics.
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Affiliation(s)
- Kota Murakami
- Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan.
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8
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Tanaka Y, Murakami K, Doi S, Ito K, Saegusa K, Mizutani Y, Hayashi S, Higo T, Tsuneki H, Nakai H, Sekine Y. Effects of A-site composition of perovskite (Sr 1-x Ba x ZrO 3) oxides on H atom adsorption, migration, and reaction. RSC Adv 2021; 11:7621-7626. [PMID: 35423258 PMCID: PMC8694951 DOI: 10.1039/d1ra00180a] [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: 01/09/2021] [Accepted: 02/08/2021] [Indexed: 11/24/2022] Open
Abstract
Hydrogen (H) atomic migration over a metal oxide is an important surface process in various catalytic reactions. Control of the interaction between H atoms and the oxide surfaces is therefore important for better catalytic performance. For this investigation, we evaluated the adsorption energies of the H atoms over perovskite-type oxides (Sr1-x Ba x ZrO3; 0.00 ≤ x ≤ 0.50) using DFT (Density Functional Theory) calculations, then clarified the effects of cation-substitution in the A-site of perovskite oxides on H atom adsorption, migration, and reaction. Results indicated local distortion at the oxide surface as a key factor governing H atom adsorption. Subtle Ba2+ substitution for Sr2+ sites provoked local distortion at the Sr1-x Ba x ZrO3 oxide surface, which led to a decrement in the H atom adsorption energy. Furthermore, the effect of Sr2+/Ba2+ ratio on the H atoms' reactivities was examined experimentally using a catalytic reaction, which was promoted by activated surface H atoms. Results show that the surface H atoms activated by the substitution of Sr2+ sites with a small amount of Ba2+ (x = 0.125) contributed to enhancement of ammonia synthesis rate in an electric field, which showed good agreement with predictions made using DFT calculations.
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Affiliation(s)
- Yuta Tanaka
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Kota Murakami
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Sae Doi
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Kazuharu Ito
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Koki Saegusa
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Yuta Mizutani
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Sasuga Hayashi
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Takuma Higo
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Hideaki Tsuneki
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Hiromi Nakai
- Department of Chemistry and Biochemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
| | - Yasushi Sekine
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan
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9
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Humphreys J, Lan R, Tao S. Development and Recent Progress on Ammonia Synthesis Catalysts for Haber–Bosch Process. ADVANCED ENERGY AND SUSTAINABILITY RESEARCH 2020. [DOI: 10.1002/aesr.202000043] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- John Humphreys
- School of Engineering University of Warwick Coventry CV4 7AL UK
| | - Rong Lan
- School of Engineering University of Warwick Coventry CV4 7AL UK
| | - Shanwen Tao
- School of Engineering University of Warwick Coventry CV4 7AL UK
- Department of Chemical Engineering Monash University Clayton Victoria 3800 Australia
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10
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Sakai R, Murakami K, Mizutani Y, Tanaka Y, Hayashi S, Ishikawa A, Higo T, Ogo S, Tsuneki H, Nakai H, Sekine Y. Agglomeration Suppression of a Fe-Supported Catalyst and its Utilization for Low-Temperature Ammonia Synthesis in an Electric Field. ACS OMEGA 2020; 5:6846-6851. [PMID: 32258920 PMCID: PMC7114694 DOI: 10.1021/acsomega.0c00170] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 02/27/2020] [Indexed: 05/30/2023]
Abstract
Fe-supported heterogeneous catalysts are used for various reactions, including ammonia synthesis, Fischer-Tropsch synthesis, and exhaust gas cleaning. For the practical use of Fe-supported catalysts, suppression of Fe particle agglomeration is the most important issue to be resolved. As described herein, we found that Al doping in an oxide support suppresses agglomeration of the supported Fe particle. Experimental and computational studies revealed two tradeoff Al doping effects: the Fe particle size decreased and remained without agglomeration by virtue of the anchoring effect of doped Al. Also, some Fe atoms anchored by Al cannot function as an active site because of bonding with oxygen atoms. Using an appropriate amount of Al doping is effective for increasing the number of active Fe sites and catalytic activity. This optimized catalyst showed high practical activity and stability for low-temperature ammonia synthesis in an electric field. The optimized catalyst of 12.5 wt % Fe/Ce0.4Al0.1Zr0.5O2-δ showed the highest ammonia synthesis rate (2.3 mmol g-1 h-1) achieved to date under mild conditions (464 K, 0.9 MPa) in an electric field among the Fe catalysts reported.
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Affiliation(s)
- Ryuya Sakai
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Kota Murakami
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Yuta Mizutani
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Yuta Tanaka
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Sasuga Hayashi
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Atsushi Ishikawa
- National
Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Takuma Higo
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Shuhei Ogo
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Hideaki Tsuneki
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Hiromi Nakai
- Department
of Chemistry and Biochemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Yasushi Sekine
- Department
of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
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11
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Murakami K, Sekine Y. Recent progress in use and observation of surface hydrogen migration over metal oxides. Phys Chem Chem Phys 2020; 22:22852-22863. [PMID: 33033817 DOI: 10.1039/d0cp04139d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hydrogen migration over a metal oxide surface is an extremely important factor governing the activity and selectivity of various heterogeneous catalytic reactions. Passive migration of hydrogen governed by a concentration gradient is called hydrogen spillover, which has been investigated broadly for a long time. Recently, well-fabricated samples and state-of-the-art measurement techniques such as operando spectroscopy and electrochemical analysis have been developed, yielding findings that have elucidated the migration mechanism and novel utilisation of hydrogen spillover. Furthermore, great attention has been devoted to surface protonics, which is hydrogen migration activated by an electric field, as applicable for novel low-temperature catalysis. This article presents an overview of catalysis related to hydrogen hopping, sophisticated analysis techniques for hydrogen migration, and low-temperature catalysis using surface protonics.
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Affiliation(s)
- Kota Murakami
- Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan.
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12
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Hisai Y, Murakami K, Kamite Y, Ma Q, Vøllestad E, Manabe R, Matsuda T, Ogo S, Norby T, Sekine Y. First observation of surface protonics on SrZrO3 perovskite under a H2 atmosphere. Chem Commun (Camb) 2020; 56:2699-2702. [DOI: 10.1039/c9cc08757e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
This is the first direct observation that surface proton hopping occurs on SrZrO3 perovskite even under a H2 (i.e. dry) atmosphere.
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Affiliation(s)
- Yudai Hisai
- Department of Applied Chemistry
- Waseda University
- Tokyo
- Japan
| | - Kota Murakami
- Department of Applied Chemistry
- Waseda University
- Tokyo
- Japan
| | - Yukiko Kamite
- Department of Applied Chemistry
- Waseda University
- Tokyo
- Japan
| | - Quanbao Ma
- Department of Chemistry
- University of Oslo
- FERMiO
- NO-0349 Oslo
- Norway
| | - Einar Vøllestad
- Department of Chemistry
- University of Oslo
- FERMiO
- NO-0349 Oslo
- Norway
| | - Ryo Manabe
- Department of Applied Chemistry
- Waseda University
- Tokyo
- Japan
| | - Taku Matsuda
- Department of Applied Chemistry
- Waseda University
- Tokyo
- Japan
| | - Shuhei Ogo
- Department of Applied Chemistry
- Waseda University
- Tokyo
- Japan
| | - Truls Norby
- Department of Chemistry
- University of Oslo
- FERMiO
- NO-0349 Oslo
- Norway
| | - Yasushi Sekine
- Department of Applied Chemistry
- Waseda University
- Tokyo
- Japan
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13
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Murakami K, Tanaka Y, Sakai R, Hisai Y, Hayashi S, Mizutani Y, Higo T, Ogo S, Seo JG, Tsuneki H, Sekine Y. Key factor for the anti-Arrhenius low-temperature heterogeneous catalysis induced by H+ migration: H+ coverage over support. Chem Commun (Camb) 2020; 56:3365-3368. [DOI: 10.1039/d0cc00482k] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Low-temperature heterogeneous catalytic reaction in an electric field is anticipated as a novel approach for on-demand and small-scale catalytic processes.
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Affiliation(s)
- Kota Murakami
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Yuta Tanaka
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Ryuya Sakai
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Yudai Hisai
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Sasuga Hayashi
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Yuta Mizutani
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Takuma Higo
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Shuhei Ogo
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Jeong Gil Seo
- Department of Energy Science and Technology
- Myongji University
- Yongin-si
- South Korea
| | - Hideaki Tsuneki
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
| | - Yasushi Sekine
- Department of Applied Chemistry
- Waseda University
- Shinjuku
- Japan
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14
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Torimoto M, Murakami K, Sekine Y. Low-Temperature Heterogeneous Catalytic Reaction by Surface Protonics. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190194] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Maki Torimoto
- Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Kota Murakami
- Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Yasushi Sekine
- Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
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