文献类型：期刊文献

英文题名：Hydroisomerization of n-heptane on the Pt/H₃PW₁₂O₄₀/Zr-MCM-41 catalysts

作者：Wang, J. A.[1];Zhou, X. L.[3];Chen, L. F.;Norena, L. E.[2];Yu, G. X.[4];Li, C. L.[3]

机构：[1]Inst Politecn Nacl, ESIQIE, Lab Catalisis & Mat, Mexico City 07738, DF, Mexico;[2]Univ Autonoma Metropolitana A, Dept Ciencias Basicas, Mexico City 02200, DF, Mexico;[3]E China Univ Sci & Technol, Petr Proc Res Ctr, Shanghai 200237, Peoples R China;[4]Jianghan Univ, Sch Chem & Environm Engn, Wuhan 430056, Peoples R China

年份：2009

卷号：299

期号：1-2

起止页码：68

外文期刊名：JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000263196400010)】；

基金：L.F. Chen wishes to acknowledge the scholarship for her study of the doctorate degree offered by the CONACyT-Mexico. The financial support from the projects SIP-IPN-2006067, CONACyT (MEXICO)-NSF (CHINA) J110.234/2007 and China 973 program (Grant No. 2004CB720603) by China Ministry of Science and Technology is greatly appreciated. The authors thank Dr. J.L. Contreras for help in the catalysis evaluation.

语种：英文

外文关键词：Hydroisomerization; n-Heptane; Acidic catalyst; Mesoporous materials; Heteropolyacid; Zr-MCM-41

摘要：Catalytic properties of the 1 wt.%Pt/25 wt.%H3PW12O40/Zr-MCM-41-n (designated as Pt/HPW/WSZn, where n=Si/Zr=25, 15, 8. 4, respectively) catalysts were evaluated in a microreactor system for the hydroisomerization of n-heptane at atmospheric condition. Catalytic results show that tungstophosphoric acid promoted mesoporous Pt/Zr-MCM-41 catalysts have potential important for the commercialization of n-heptane isomerization due to their high activity and unique selectivity to multibranched isoheptanes. It was found that 2-methylhexane was predominant in the monobranched isoheptanes and 2,3-dimethylpentane was the prevailing compound in the multibranched products. In the cracking products, only butane (isobutane and n-butane) and propane were formed. The formation of the multibranched isoheptanes had a close correlation with the mesopore diameters of the catalysts. The isomerization selectivity could be expressed by a parameter S-P, which is defined as a comprehensive function of Bronsted acid density, metal dispersion and geometry of the catalysts. The reaction mechanisms involving the formations of monobranched and multibranched isoheptanes as well as cracking products were discussed and postulated. (C) 2008 Elsevier B.V. All rights reserved.