Promoting and inhibiting effect of SO2 on propane oxidation over Pt/Al2O3 |
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| Affiliation: | 1. Laboratorio de Catalisis Ambiental, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla., Teziutlan Sur 61, Puebla, Puebla 72160, Mexico;2. Departamento de Fı́sica CINVESTAV. Apto. Postal 14-740, México 07000, D.F., Mexico;1. Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, United States;2. Department of Chemical Engineering, University of Virginia, Charlottesville, VA, United States;1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, PR China;3. College of Forestry, Henan Agricultural University, Zhengzhou 450002, PR China;4. Environment Research Institute, Shandong University, Qingdao 266237, PR China;5. University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | SO2 adsorption, SO2 oxidation and oxidation of propane with oxygen in the absence and the respective presence of SO2 in the feed gas were studied over unsulfated and sulfated 1% Pt/γ-Al2O3.Results showed that the promoting effect of SO2 in the reaction flux on C3H8 oxidation over 1% Pt/γ-Al2O3 depends on the presulfating temperature. Catalytic activity measurements and FTIR absorption spectra showed that during propane oxidation, Pt/support interfacial adsorbed species were formed at temperatures 25–300 °C, inhibiting C3H8 oxidation. However, at higher temperatures these Pt/support interfacial adsorbed species were oxidized, leading to Pt/support interfacial sulfate species, which strongly promote propane oxidation. |
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