Preparation of Pt/TiO<sub>2</sub>/ZSM-5 catalyst for catalytic conversion of n-butane

LIU Jia; JIANG Guiyuan; ZHAO Zhen; HAN Shanlei; ZHANG Yaoyuan; YANG Qingxin; SUN Qianyao; WANG Yajun

doi:10.11949/j.issn.0438-1157.20160464

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

更新时间：2025-12-10

- Preparation of Pt/TiO₂/ZSM-5 catalyst for catalytic conversion of n-butane
- CIESC Journal Issue 8, Pages: 3363-3373(2016)
- 作者机构：
  
  中国石油大学(北京)重质油国家重点实验室,北京,102249
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160464
  CLC： 643.3
- Online First：05 August 2016，
  
  Published：05 August 2016
- 稿件说明：
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LIU Jia, JIANG Guiyuan, ZHAO Zhen, et al. Preparation of Pt/TiO₂/ZSM-5 catalyst for catalytic conversion of n-butane[J]. CIESC Journal, 2016, (8): 3363-3373. DOI: 10.11949/j.issn.0438-1157.20160464.
DOI：

LIU Jia, JIANG Guiyuan, ZHAO Zhen, et al. Preparation of Pt/TiO₂/ZSM-5 catalyst for catalytic conversion of n-butane[J]. CIESC Journal, 2016, (8): 3363-3373. DOI: 10.11949/j.issn.0438-1157.20160464. DOI：

摘要

采用溶胶-凝胶法和等体积浸渍法，分别对ZSM-5分子筛进行TiO2改性和Pt负载，获得了具有脱氢-裂解双功能的Pt/TiO2/ZSM-5催化剂，采用XRD、N2吸附-脱附、TEM、XPS和NH3-TPD对样品的晶体结构，孔结构、形貌、活性金属价态和酸性质等进行了表征，并研究了正丁烷在此催化剂上催化转化制备低碳烯烃的反应规律。研究结果表明，TiO2的引入，一方面使得改性后的ZSM-5分子筛获得了额外的酸性中心，特别是强酸性位含量的增加，有助于促进正丁烷的活化；另一方面Pt与TiO2之间存在“金属-载体”强相互作用（SMSI），在H2还原气氛下，Pt能够促进TiO2的还原，生成Ti3+物种，而Ti3+的存在增加了Pt周围的电荷密度

降低了Pt对低碳烯烃（C2=～C3=）的吸附能力，抑制了深度脱氢和生焦反应，从而提高双功能催化剂对烯烃的选择性。当H2还原温度为450℃时

Pt/10TiO2/ZSM-5催化剂在625℃下的正丁烷转化率为76.1%，低碳烯烃（C2=～C3=）收率为50.9%，分别比Pt/ZSM-5催化剂提高了16.7%和12.6%。

Abstract

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.

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

DOI：10.11949/j.issn.0438-1157.20160464

摘要

Abstract

关键词

Keywords

references

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