Preferential CO oxidation over activated carbon supported catalysts in H2-rich gas streams containing CO2 and H2O |
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| Affiliation: | 1. State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Science, Beijing, PR China;2. Department of Mechanical Convergence Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;1. Quantum Materials Research Center, College of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou, Henan 450044, China;2. College of Physics and Electronic Engineering, Henan Normal University, Xinxiang, Henan, 453007, China;1. Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany;2. Key Lab for Colloid and Interface Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China;1. Department of Physics and Electronic Science, Zhengzhou Normal University, Zhengzhou, Henan 450044, People''s Republic of China;2. Quantum Materials Research Center, Zhengzhou Normal University, Henan 450044, People''s Republic of China;3. College of Physics and Electronic Engineering, Henan Normal University, Xinxiang, Henan 453007, People''s Republic of China;4. College of Physics and Electrical Engineering, Anyang Normal University, Anyang, Henan 455000, People''s Republic of China;1. Department of Molecular Sciences and Nanosystems, Ca’Foscari University of Venice, INSTM Venice Research Unit, Via Torino 155/B, 30172 Venice, Italy;2. Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, E-29071 Málaga, Spain |
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| Abstract: | Selective CO oxidation (PROX) was studied at 423 K over 1% Pt–0.25% SnOx and 1% Pt–1% CeOx catalysts supported on un-oxidized and oxidized activated carbon (AC) using feed mixtures simulating the reformate coming from fuel processors. Effects of the addition of 15% CO2 or (15% CO2 + 10% H2O) into feed mixtures containing 1% CO, 1% O2, 60% H2 and He were determined for nine different AC-supported catalysts, and the results were compared with those obtained with pure H2-rich feed. Unlike other PROX catalysts having oxide supports, introduction of CO2 into pure feed drastically increased CO conversion on all nine catalysts supported on oxidized or un-oxidized AC regardless of impregnation strategy.1% Pt–0.25% SnOx supported on HNO3-oxidized AC stands out as a potential candidate for commercial use in PROX since it yields 100% CO conversion under realistic feed conditions. 1% Pt–1% CeOx catalysts prepared by sequential or co-impregnation and supported on air-oxidized AC also give 100% CO conversion in H2-rich feed containing (CO2 + H2O) during extended run times and hence hold promise as PROX catalysts. |
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