Preferential CO oxidation on Ru/Al2O3 catalyst: An investigation by considering the simultaneously involved methanation |
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| Affiliation: | 1. National Institute of Advanced Industrial Science and Technology (AIST), 2-17 Tuskisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan;2. Institute of Processing Engineering, The Chinese Academy of Sciences, P.O. Box 353, Beijing 100080, China;1. Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan;2. Department of Greenergy, National University of Tainan, Tainan 700, Taiwan;1. Department of Chemical and Biochemical Engineering, National Engineering Laboratory for Green Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;2. State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;3. Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, United States;1. Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitária, 05508-000, São Paulo, SP, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares – IPEN-CNEN/SP, Av. Prof. Lineu Prestes, 2242, Cidade Universitária, 05508-900 São Paulo, SP, Brazil;3. Instituto de Química da Universidade Federal Fluminense, Grupo de Eletroquímica e Materiais Nanoestruturados, Campus Valonguinho, Niterói, RJ CEP, 24020-141, Brazil;4. Department of Chemistry, University of Helsinki, A.I. Virtasen Aukio 1, Helsinki, Finland;1. Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla-CSIC, Avda. Américo Vespucio, 49, 41092 Sevilla, Spain;2. Laboratoire Catalyse et Spectrochimie, Normandie Univ, ENSICAEN, UNICAEN, CNRS, Bd. Maréchal Juin, 14000 Caen, France;3. Dpto. Química Inorgánica, Universidad de Sevilla, C/Prof. García González 1, 41012 Sevilla, Spain;1. Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla-CSIC, Avenida Américo Vespucio 49, 41092 Seville, Spain;2. Departamento de Química Aplicada, Edificio de los Acebos, Universidad Pública de Navarra, Campus de Arrosadía s/n, E-31006 Pamplona, Spain;1. São Carlos Federal University (UFSCar), Chemical Engineering Department (DEQ), Rod. Washington Luiz, km 235 – SP 310, CEP 13565-905, São Carlos, SP, Brazil;2. São Carlos Institute of Chemistry (IQSC), University of São Paulo (USP), Av. Trabalhador São-Carlense 400, CEP 13566-590, São Carlos, SP, Brazil |
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| Abstract: | The CO removal with preferential CO oxidation (PROX) over an industrial 0.5% Ru/Al2O3 catalyst from simulated reformates was examined and evaluated through considering its simultaneously involved oxidation and methanation reactions. It was found that the CO removal was fully due to the preferential oxidation of CO until 383 K. Over this temperature, the simultaneous CO methanation was started to make a contribution, which compensated for the decrease in the removal due to the decreased selectivity of PROX at higher temperatures. This consequently kept the effluent CO content as well as the overall selectivity estimated as the ratio of the removed CO amount over the sum of the consumed O2 and formed CH4 amounts from apparently increasing with raising reaction temperature from 383 to 443 K when the CO2 methanation was yet not fully started. At these temperatures the tested catalyst enabled the initial CO content of up to 1.0 vol.% to be removed to several tens of ppm at an overall selectivity of about 0.4 from simulated reformates containing 70 vol.% H2, 30 vol.% CO2 and with steam of up to 0.45 (volume) of dry gas. Varying space velocity in less than 9000 h−1 did not much change the stated overall selectivity. From the viewpoint of CO removal the article thus concluded that the methanation activity of the tested Ru/Al2O3 greatly extended its working temperatures for PROX, demonstrating actually a feasible way to formulate PROX catalysts that enable broad windows of suitable working temperatures. |
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