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Reaction and Separation Mechanism in Zeolite Catalytic Membrane Reactor for Dehydrogenation

沸石催化膜脱氢反应器的反应与分离机理

基本信息

批准号：
14350418
负责人：
KUSAKABE Katsuki
金额：
$ 9.02万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

An FAU-type zeolite membrane was formed on porous α-alumina support tube by hydrothermal synthesis method. Vapor permeation test of the membrane was carried out. Then dehydrogenation of cyclohexane was performed in the membrane reactor with the zeolite membrane. Finally, reaction and separation behaviors in the membrane reactor were simulated.Vapor permeation of benzene arid saturated C4-C7 hydrocarbons was studied. For the case of a single-component feed, permeance to cyclohexane was higher than that to benzene. Meanwhile high benzene/cyclohexane selectivity can be attributed to the high adsorption selectivity in favor of benzene and the blockage against cyclohexane. Similar results were obtained for the case of binary mixture of benzene and other saturated hydrocarbons.An FAU-type zeolite membrane was used for the catalytic dehydrogenation of cyclohexane in a membrane reactor packed with a Pt/Al_2O_3 catalyst. The conversion of cyclohexane in the membrane reactor increased beyond the thermodynamic equilibrium value due to the simultaneous removal of hydrogen and benzene from the reaction site.A simple mathematical model assuming isothermal operation and a plug flow pattern was developed to evaluate the performance of an FAU-type zeolite membrane reactor. The result of the simulation was in good agreement with the experimental result. As a result, the reduction in coke formation on the catalysts in the membrane reactor was clearly demonstrated.

采用水热合成法在多孔α-氧化铝支撑管上制备了fu型沸石膜。对膜进行了透气性测试。然后用沸石膜在膜反应器中对环己烷进行脱氢。最后，对膜反应器中的反应和分离行为进行了模拟。研究了苯和饱和C4-C7烃的蒸汽渗透。对于单组分进料，对环己烷的渗透率高于对苯的渗透率。同时，苯/环己烷的高选择性可归因于对苯的高吸附选择性和对环己烷的高阻塞性。在苯和其他饱和烃二元混合物的情况下也得到了类似的结果。在Pt/Al_2O_3催化剂填充的膜反应器中，采用fu型沸石膜催化环己烷脱氢。膜反应器中环己烷的转化率高于热力学平衡值，这是由于反应现场同时脱除了氢和苯。建立了一个简单的数学模型，假设等温操作和塞流模式，以评估fau型沸石膜反应器的性能。仿真结果与实验结果吻合较好。结果表明，膜反应器中催化剂上的焦炭生成减少。