期刊
APPLIED CATALYSIS A-GENERAL
卷 443, 期 -, 页码 59-66出版社
ELSEVIER
DOI: 10.1016/j.apcata.2012.07.022
关键词
Dehydrogenation; Ceria zirconia; Deactivation; Coke combustion
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Knowledge Economy of the Korean Government
The influence of CeyZr1-yO2 content (0 < y < 1) in Pt-Sn/xCeZr-Al catalysts, where x was the weight percentage of (Ce + Zr) and calculated as [mass of (Ce + Zr)] x 100/[mass of (Ce + Zr + Al2O3)], on stability and regeneration temperature in propane dehydrogenation was studied using a fixed-bed reactor at 600 degrees C and 1 bar of pressure. The XRD data revealed that CeyZr1-yO2 phases were formed over xCeZr-Al (x not equal 0) supports and the concentration of Zr4+ ions in these phases increased when the CeyZr1-yO2 content was increased. The band of oxygen vacancies characterized by Raman spectra at ca. 620-645 cm(-1) was strongly dependent on catalyst processing; introduction of metal (Pt, Sn) and/or re-calcination created more oxygen vacancies in the catalysts. The XRD patterns and XPS data of the reduced Pt-Sn/xCeZr-Al catalysts did not indicate the formation of Pt-Sn alloys. The XPS and CO-IR spectra demonstrated that Pt became more electron deficient with increasing CeyZr1-yO2 content. The higher catalytic stability and lower coke combustion temperature (regeneration temperature) were obtained with a higher CeyZr1-yO2 content in Pt-Sn/xCeZr-Al catalysts. (C) 2012 Elsevier B.V. All rights reserved.
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