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。
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 RE mechanism, meanwhile model (3) is the rate determining step.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第2期252-256,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
