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.[1]; Nore?a, L.E.[2]; Yu, G.X.[4]; Li, C.L.[3]

机构：[1] Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, Col. Zacatenco, 07738 México, D.F., Mexico; [2] Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-A, Av. San Pablo No. 180, 02200 México, D.F., Mexico; [3] Petroleum Processing Research Center, East China University of Science and Technology, 200237 Shanghai, China; [4] School of Chemistry and Environmental Engineering, Jianghan University, 430056 Wuhan, 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：EI(收录号：20090311865006)

语种：英文

外文关键词：Butane - Heptane - Isomers - Catalytic cracking - Cracks - Isomerization - Catalyst selectivity

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 SP, which is defined as a comprehensive function of Br?nsted 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. ? 2008 Elsevier B.V. All rights reserved.