CO multipulse TAP studies of 2% Pt/CeO2 catalyst: Influence of catalyst pretreatment and temperature on the number of active sites observed |
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| Authors: | SO Shekhtman A Goguet R Burch C Hardacre N Maguire |
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| Affiliation: | 1. State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;2. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, IN 47907, United States;3. Department of Chemistry, Faculty of Science, the Chinese University of Hong Kong, Shatin, NT, Hong Kong, China;1. Department of Chemistry, Heterogeneous Catalysis Laboratory, University of Cyprus, University Campus, P.O. Box 20537, Nicosia 1678, Cyprus;2. Department of Chemical Technology and Catalysis, University of Bucharest, 4-12 Regina Elisabeta Bvd., Bucharest, Romania;1. Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, CH-8092 Zurich, Switzerland;2. Department of Chemistry and Applied Biosciences, ETH Zurich, Hönggerberg, HCI, CH-8093 Zurich, Switzerland;3. Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;1. MCMA Group, Department of Inorganic Chemistry and Institute of Materials, University of Alicante, Carretera de Sant Vicent del Raspeig s/n, 03690, Sant Vicent del Raspeig, Alicante, Spain;2. Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa 34, 20156 Milano, Italy |
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| Abstract: | CO multipulse temporal analysis of products (TAP) experiments were used to characterize a ceria-supported platinum catalyst after various oxidative and reductive pretreatments using O2, H2O, CO2, and H2. Based on the amount of CO consumed, using the final CO-saturated catalyst composition as the common state point, the oxidatively pretreated catalyst could be described using a general scale. From a kinetic analysis of the CO multipulse responses, two kinetic regimes corresponding to two types of active sites could be identified. As the temperature was raised, the number of the most active sites did not change while the amount of the less active site increased. Comparison of the number of active sites determined from the TAP data reported herein with that determined by a previous steady-state isotope transient kinetic analysis experiment showed excellent agreement. This correlation indicates that the (very fast response) TAP experiments can provide information regarding the number and type of active sites that are relevant to a catalyst under real reaction conditions. |
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