文献类型：会议论文

英文题名：RE₂O₃-promoted Pt-SO₄^2-/ZrO₂-Al₂O₃ catalyst in n-hexane hydroisomerization

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

机构：[1]E China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Jianghan Univ, Sch Chem & Environm Engn, Wuhan 430056, Peoples R China;[3]Inst Politecn Nacl, ESIQIE, Mexico City 07738, DF, Mexico

会议论文集：2nd International Symposium on New Catalytic Materials

会议日期：AUG 16-20, 2009

会议地点：Cancun, MEXICO

语种：英文

外文关键词：Rare earth oxide promotion; Hydroisomerization; n-Hexane; Sulfated zirconia; Alumina; Sulfate loss; Catalytic stability

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 N-2-adsorption, XRD, TG, FTIR, XPS and H-2-TPR. It was elucidated that the introduction of RE2O3 into Pt-SO42-/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 RE2O3 addition to PSZA. The promotion effects of RE oxides addition decreased in the order: La2O3 > Yb2O3 > Ce2O3. (C) 2010 Elsevier B. V. All rights reserved.