文献类型：期刊文献

英文题名：Effect of isopropanol aging of Zr(OH)₄ on n-hexane isomerization over Pt-SO₄^2-/Al₂O₃-ZrO₂

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

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

年份：2009

卷号：148

期号：1-2

起止页码：70

外文期刊名：CATALYSIS TODAY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000271830100012)】；

基金：We would like to thank the financial supports from the key international cooperative research projects by National Ministry of Science and Technology, PR China (No. 2004CB720603).

语种：英文

外文关键词：Isopropanol aging; Zirconium hydroxide; Hydroisomerization; n-Hexane; Sulfated zirconia; Alumina

摘要：Two Pt/SO42-/ZrO2-Al2O3 (denoted as PSZA and I-P5ZA) catalysts were prepared by using Zr(OH)(4) as precursor aged in different conditions, including conventional aging and isopropanol aging. The textural properties, crystalline structure, surface acidity and reduction behaviours of the as PSZA and I-PSZA catalysts were comparatively investigated by N-2 adsorption isotherms, XRD, TG-DSC, pyridine-FTIR and H-2-TPR techniques. Catalytic tests showed that, using isopropanol aged Zr(OH)(4) as ZrO2 precursor, in the n-hexane isomerization reaction, the catalytic activity and stability of the catalyst could be greatly increased and the selectivity of 2,2-DMB was enhanced by more than two times. It was found that isopropanol aging of Zr(OH)(4) modified the textural properties and inhibited zirconia phase transformation and stabilized the tetragonal ZrO2 crystalline structure. On the I-PSZA catalyst, more acid centers were formed in comparison with that presented on the PSZA catalyst. Our experimental results show that the surface acidity, textural properties and phase composition of the Pt/SO42-/ZrO2-Al2O3 catalysts play an important role in n-hexane hydroisomerization. (C) 2009 Elsevier B.V. All rights reserved.