文献类型：期刊文献

英文题名：RE2O3-promoted Pt-SO42-/ ZrO2-Al2O3 catalyst in n-hexane hydroisomerization

作者：Yu, G.X.[1,2]; Lin, D.L.[2]; Hu, Y.[2]; Zhou, X.L.[2]; Li, C.L.[2]; Chen, L.F.[3]; Wang, J.A.[3]

机构：[1] School of Chemistry and Environmental Engineering, Jianghan University, Wuhan 430056, China; [2] School of Chemical Engineering, East China University of Science and Technology, 130, Meilong Road, Shanghai 200237, China; [3] ESIQIE, Instituto Politécnico Nacional, Av. Politécnico S/N, 07738 México, D.F., Mexico

年份：2011

卷号：166

期号：1

起止页码：84

外文期刊名：Catalysis Today

收录：EI(收录号：20112013985987)

语种：英文

外文关键词：Catalyst activity - Aluminum oxide - Alumina - Rare earths - X ray photoelectron spectroscopy - Isomerization - Hexane - Zirconia

摘要：Lanthanum, cerium and ytterbium nitrates used as RE oxide precursors, RE2O3-promoted PSZA catalysts for n-hexane hyroisomerization were prepared and RE2O3 promotion effects on catalytic activity and catalytic stability were investigated by N2-adsorption, XRD, TG, FTIR, XPS and H2-TPR. It was elucidated that the introduction of RE2O3 into Pt-SO 42-/ZrO2-Al2O3 (PSZA) increased both the surface area and the number of active sites, resulting in a higher n-hexane isomerization activity. At the same time the catalyst stability has also been markedly increased by alleviating the sulfur loss and by stabilizing ZrO2 tetragonal crystalline structure. In addition, XPS for the spent catalysts showed during n-hexane hydroisomerization reaction a relative small amount of S6+ species was reduced to S4+, and the amount of the most active sulfate entities decided the overall amount of n-hexane transformed, their reduction being, perhaps, retarded by the RE 2O3 addition to PSZA. The promotion effects of RE oxides addition decreased in the order: La2O3 > Yb 2O3 > Ce2O3. ? 2010 Elsevier B.V. All rights reserved.