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Methanol Steam Reforming on Bimetallic Catalysts Based on In and Nb Doped Titania or Zirconia: A Support Effect. Processes (Basel) 2021. [DOI: 10.3390/pr10010019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Methanol steam reforming (MSR) is considered an effective method for hydrogen storage and to generate high-quality hydrogen for fuel cells. In this work, a comprehensive investigation of the methanol steam reforming process using a bimetallic Pt–Rh and Cu–Ni based on different oxide supports is presented. Highly dispersed titania and zirconia doped with indium and niobium ions were synthesized by sol–gel method. The effect of the nature and quantity of the dopant cation (In, Nb) on the catalytic performance of titania supported metal catalysts was investigated. The conclusions obtained show a significant effect of both the metal alloy and the oxide support nature on the activity and selectivity of the methanol steam reforming process. Pt–Rh alloy catalyst shows higher hydrogen yield, but its selectivity in the MSR process is lower than for the catalysts containing the Cu0.8-Ni0.2 alloy. Heterovalent indium doping of titania leads to the catalytic activity increase. It was suggested that this is due to the defects formation in the oxygen TiO2 sublattice. On the contrary, the use of niobium oxide as a dopant decreases the catalyst activity in the methanol steam reforming process but leads to the selectivity increase in the studied process.
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Kamyar N, Khani Y, Amini MM, Bahadoran F, Safari N. Embedding Pt‐SnO Nanoparticles into MIL‐101(Cr) Pores: Hydrogen Production with Low Carbon Monoxide Content from a New Methanol Steam Reforming Catalyst. ChemistrySelect 2019. [DOI: 10.1002/slct.201901071] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Niloofar Kamyar
- Department of ChemistryShahid Beheshti University, G.C. Tehran 1983963113 Iran
| | - Yasin Khani
- Department of ChemistryShahid Beheshti University, G.C. Tehran 1983963113 Iran
| | - Mostafa M. Amini
- Department of ChemistryShahid Beheshti University, G.C. Tehran 1983963113 Iran
| | - Farzad Bahadoran
- Gas Research DivisionResearch Institute of Petroleum Industry 1485733111, Tehran Iran
| | - Nasser Safari
- Department of ChemistryShahid Beheshti University, G.C. Tehran 1983963113 Iran
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Bao J, Yang G, Yoneyama Y, Tsubaki N. Significant Advances in C1 Catalysis: Highly Efficient Catalysts and Catalytic Reactions. ACS Catal 2019. [DOI: 10.1021/acscatal.8b03924] [Citation(s) in RCA: 166] [Impact Index Per Article: 33.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jun Bao
- National Synchrotron Radiation Laboratory, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, P.R. China
| | - Guohui Yang
- Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, P.R. China
| | - Yoshiharu Yoneyama
- Department of Applied Chemistry, School of Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan
| | - Noritatsu Tsubaki
- Department of Applied Chemistry, School of Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan
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Fornari AC, Menechini Neto R, Lenzi GG, dos Santos OAA, de Matos Jorge LM. Utilization of sol-gel CuO-ZnO-Al 2
O 3
catalysts in the methanol steam reforming for hydrogen production. CAN J CHEM ENG 2017. [DOI: 10.1002/cjce.23005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Arielle Cristina Fornari
- State University of Maringá - UEM, Department of Chemical Engineering; Av. Colombo, nº 5790, CEP: 87020-900 Maringá PR Brazil
| | - Raphael Menechini Neto
- State University of Ponta Grossa - UEPG, Department of Physics; Av. General Carlos Cavalcanti, 4748, CEP: 84030-900 Ponta Grossa PR Brazil
| | - Giane Gonçalves Lenzi
- Federal Technological University of Paraná - UTFPR, Department of Chemical Engineering; Av. Monteiro Lobato, s/n, km 04, CEP: 84016-210 Ponta Grossa PR Brazil
| | | | - Luiz Mario de Matos Jorge
- State University of Maringá - UEM, Department of Chemical Engineering; Av. Colombo, nº 5790, CEP: 87020-900 Maringá PR Brazil
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Abstract
In this work, we found that sodium doping can be used to improve CO2 selectivity for supported Pt catalyst during methanol steam reforming. These materials are usually very active in the low temperature range; however, they are characterized by high selectivity of CO, which is a poison in downstream polymer electrolyte membrane fuel cells (PEM-FC) application. With Na doping, we found that CO2 selectivity was higher than 90% when 2.5 wt.% of sodium was added to Pt/YSZ. We have speculated that the different product distribution is due to a different reaction pathway being opened for CH3OH decomposition. Methanol decarbonylation was favored when Na was absent or low, while a formate decarboxylation pathway was favored when Na content reached 2.5 wt.%. The proposal is rooted in the observed weakening of the C-H bond of formate, as demonstrated in in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and kinetic isotope effect (KIE) experiments for the water-gas shift reaction conducted at low temperature. When adsorbed methoxy, produced when methanol is dissociatively adsorbed, was converted in the presence of H2O in DRIFTS spectroscopy, formate species were prevalent for a 2% Pt–2.5% Na/YSZ catalyst, while only a minor contribution was observed for 2% Pt/YSZ. Moreover, the formate produced on Na-doped Pt/YSZ exhibited ν(CH) stretching bands at low wavenumber, consistent with C–H bond weakening, thus favoring dehydrogenation (and decarboxylation). It is proposed that when Na is present, formate is likely an intermediate, and because its dehydrogenation is favored, selectivity can be fine-tuned between decarbonylation and decarboxylation based on Na dopant level.
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