Bao Khanh Vu Shin, Eun Woo Ha, Jeong-Myeong Kim, Seok Ki Suh, Dong Jin Kim, Won-Il Koh, Hyoung-Lim Choi, Young Gyo Lee, Seung-Bum 2024-01-20T13:32:50Z 2024-01-20T13:32:50Z 2021-09-05 2012-11-07 0926-860X https://pubs.kist.re.kr/handle/201004/128655 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. English ELSEVIER X-RAY-DIFFRACTION CARBON-MONOXIDE PLATINUM PHASE SPECTROSCOPY BEHAVIOR REDOX METAL RAMAN TIN The roles of CeyZr1-yO2 in propane dehydrogenation: Enhancing catalytic stability and decreasing coke combustion temperature Article 10.1016/j.apcata.2012.07.022 1 APPLIED CATALYSIS A-GENERAL, v.443, pp.59 - 66 APPLIED CATALYSIS A-GENERAL 443 59 66 scie scopus 000309644400007 2-s2.0-84866131288 Chemistry, Physical Environmental Sciences Chemistry Environmental Sciences & Ecology Article X-RAY-DIFFRACTION CARBON-MONOXIDE PLATINUM PHASE SPECTROSCOPY BEHAVIOR REDOX METAL RAMAN TIN Dehydrogenation Ceria zirconia Deactivation Coke combustion