H-ZSM-5分子筛催化二甲苯异构化的反应机理

引用本文: 李玲玲, 聂小娃, 宋春山, 郭新闻. H-ZSM-5分子筛催化二甲苯异构化的反应机理[J]. 物理化学学报, doi: 10.3866/PKU.WHXB201302063 shu

Citation: LI Ling-Ling, NIE Xiao-Wa, SONG Chun-Shan, GUO Xin-Wen. Isomerization Mechanismof Xylene Catalyzed by H-ZSM-5 Molecular Sieve[J]. Acta Physico-Chimica Sinica, doi: 10.3866/PKU.WHXB201302063 shu

H-ZSM-5分子筛催化二甲苯异构化的反应机理

基金项目:
新世纪优秀人才项目(NCET-04-0268)资助和大连理工大学网络与信息化中心高性能计算部支持 (NCET-04-0268)

摘要:

采用密度泛函理论(DFT)和ONIOM方法, 研究了H-ZSM-5分子筛上二甲苯异构化机理. 描述了中间体物种和过渡态的结构. 反应物吸附和产物脱附对二甲苯异构化的反应趋势有重要影响. 反应活化能的计算结果表明, 在H-ZSM-5分子筛延伸的孔道结构中, 异构化反应沿着生成间二甲苯的方向进行. 但是较高的脱附能使生成的间二甲苯滞留在分子筛孔道中,其进一步异构化生成对二甲苯具有动力学优势. 对二甲苯产物在分子筛孔道的酸中心上可选择性生成. 在H-ZSM-5分子筛外表面, 不受延伸孔道结构的静电限制时, 二甲苯异构化生成间二甲苯产物, 其可以很容易从活性位上脱附. 非选择性异构化降低了对二甲苯的选择性. 因此, 对H-ZSM-5分子筛外表面改性能够抑制二甲苯的非选择性异构化, 因此限制了反应在分子筛孔道中进行, 提高了对二甲苯的选择性. 二甲苯异构化相对反应速率常数的计算结果也表明, 在分子筛外表面上, 生成间二甲苯的异构化反应速率较快. 升高反应温度会降低对二甲苯的选择性.

关键词:

English

Isomerization Mechanismof Xylene Catalyzed by H-ZSM-5 Molecular Sieve

1.
1 State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China;
2 Department of Chemical & Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA;
3 EMS Energy Institute, PSU-DUT Joint Center for Energy Research and Department of Energy & Mineral Engineering, Pennsylvania State University, University Park, PA 16802, USA
Received Date: 04 December 2012
Available Online: 25 March 2013
Fund Project:
新世纪优秀人才项目(NCET-04-0268)资助和大连理工大学网络与信息化中心高性能计算部支持

Abstract:

The isomerization mechanism of xylene over H-ZSM-5 molecular sieve has been examined using the density functional theory (DFT) and our own-N-layered integrated molecular orbital+molecular mechanics (ONIOM) methods. The structures of intermediate species and transition states are described. The adsorption of reactant and desorption of product significantly affect the tendency of xylene to isomerize. Calculated activation energies suggest that isomerization occurs during the formation of meta-xylene within the extended pore structure of H-ZSM-5 molecular sieve. However, the produced meta-xylene is retained within the pore because of a high desorption energy, and further isomerization to form para-xylene is kinetically favorable. The acid sites within the pores of the molecular sieve allow selective formation of para-xylene. On the external surface of H-ZSM-5 molecular sieve, which lacks the steric constraints of the extended pore structure, xylene isomerizes to form meta-xylene, which can readily desorb from the active site. Such non-selective isomerization decreases the selectivity for para-xylene. Thus, external surface modification of H-ZSM-5 molecular sieve should suppress the non-selective isomerization of xylene, thereby increasing the selectivity for para-xylene by restricting isomerization to inside the pores of the molecular sieve. Calculated relative reaction rate constants for xylene isomerization also indicate that xylene isomerization occurring on the external surface of H-ZSM-5 with meta-xylene as the product has the highest reaction rate. The selectivity for para-xylene is decreased as the reaction temperature is increased.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

H-ZSM-5分子筛催化二甲苯异构化的反应机理

English

Isomerization Mechanismof Xylene Catalyzed by H-ZSM-5 Molecular Sieve

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

H-ZSM-5分子筛催化二甲苯异构化的反应机理

English

Isomerization Mechanismof Xylene Catalyzed by H-ZSM-5 Molecular Sieve

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

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