高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (2): 252.

• 研究论文 • 上一篇    下一篇

在HZSM-5分子筛上甲醇脱水反应动力学研究——在活塞流反应器及连续搅拌槽式反应器中稳态反应的分析

臧雅茹, 陶克毅, 高峰, 郭延谋, 李赫咺   

  1. 南开大学化学系, 天津 300071
  • 收稿日期:1992-05-05 修回日期:1992-10-24 出版日期:1993-02-24 发布日期:1993-02-24
  • 通讯作者: 李赫咺
  • 基金资助:

    国家自然科学基金

Reaction Kinetics Study of Methanol IDehydration on HZSM-5 Zeolite ——Analysis of Steady State Reaction in a Plug Flow Reactor and in a Continuous Stirred Tank Reactor

ZANG Ya-Ru, TAO Ke-Yi, GAO Feng, GUO Yan-Mou, LI He-Xuan   

  1. Department of Chemistry, Nankai Unittersity, Tianjin, 300071
  • Received:1992-05-05 Revised:1992-10-24 Online:1993-02-24 Published:1993-02-24

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摘要： 以连续流动稳态法研究了甲醇在HZSM-5分子筛上生成二甲醚的反应动力学。使用活塞流反应器及连续搅拌槽式反应器,在150～190℃内分别得到相应的动力学数据。依据分子态吸附的甲醇在表面反应的可逆性及二甲醚吸附能力极弱的特性建立了反应机理模型,认为吸附态的与气相中的甲醇进行分子间反应生成二甲醚是速控步骤的Rideal-Eley机理。

关键词: 动力学, 甲醇脱水, 机理模型

Abstract: Using the method of continuous flow steady state, we study the kinetics of methanol dehydration to form dimethylether on HZSM-5 zeolite.By means of two reactor--Plug Flow Reactor(PFR) and Continuous Stirred Tank Reactor (CSTR), we obtain the integral and differential kinetic data, respectively.The molecule state adsorption, reversibility of surface reaction and unadsorption of dimethylether are considered.Six mechanism models of this dehydrate reaction are established in connection to Langmuir-Hinshelwood(LH) and Rideal-Eley(RE) mechanisms.The correlative rate equations are given as equations (5)-(7) and (8)-(10).However since equations (7) and (10) are the same, there are only 5 rate equations ought to be dealt with the non-linear regression method.Corresponding to every equation and every reactor, six parameters may be obtained.According to the requirement of all parameters which are positive values, we can come to the conclusion that only model (9) is allowed.That is REmechanism, meanwhile model (3) is the rate determining step.

Key words: Kinetics, Methanol dehydration, Mechanism model

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