Preparation of Pt/TiO2/ZSM-5 catalyst for catalytic conversion of n-butane

被引：0

作者：

Liu J. ^{[1
]}

Jiang G. ^{[1
]}

Zhao Z. ^{[1
]}

Han S. ^{[1
]}

Zhang Y. ^{[1
]}

Yang Q. ^{[1
]}

Sun Q. ^{[1
]}

Wang Y. ^{[1
]}

机构：

[1] State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing

来源：

Huagong Xuebao/CIESC Journal | 2016年 / 67卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Catalyst; Light olefins; Molecular sieves; Pt/TiO[!sub]2[!/sub]/ZSM-5; Strong metal-support interaction;

D O I：

10.11949/j.issn.0438-1157.20160464

中图分类号：

学科分类号：

摘要：

Pt/TiO2/ZSM-5 catalyst with dehydrogenation-cracking bifunctionality catalytic activity was prepared by modifying ZSM-5 zeolite with titanium dioxide (TiO2) via sol-gel method and then loading Pt to the titanium modified ZSM-5 zeolite by incipient impregnation method. The as-prepared catalyst was characterized by means of XRD, N2 adsorption-desorption, TEM, XPS and NH3-TPD to analyze crystal structure, pore properties, morphology, valence states of active metal and acid properties of the catalyst, and the catalytic performance for the cracking of n-butane into light olefins was investigated. The results showed that the introduction of titanium dioxide provided additional acid sites to ZSM-5 zeolite, especially increasing the strong acid centers and enhancing the activation of n-butane. In addition, after reduction in hydrogen atmosphere, the partially reduced Ti3+ species was generated which was catalyzed by platinum due to the strong metal-support interaction (SMSI) between Pt and TiO2. The formation of appropriate amount of Ti3+ species enhanced the electron density around Pt, and thus weakened the adsorption of ethene and propene on Pt atoms. After reduction by hydrogen at 450℃, n-butane conversion of 76.1% and yield of light olefins (C2=-C3=) of 50.9% were achieved at the reaction temperature of 625℃ over Pt/10TiO2/ZSM-5 catalyst, which was 16.7% and 12.6% higher than those of Pt/ZSM-5 catalyst, respectively. © All Right Reserved.

引用

页码：3363 / 3373

页数：10

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