Current views on the mechanism of catalytic cracking
Current views on the mechanism of catalytic cracking
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DOI：
10.1016/s1387-1811(99)00205-x
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发表时间：
2000-04-01
影响因子：
5.2
通讯作者：
Orchillés, AV
中科院分区：
文献类型：
--
作者：
Corma, A;Orchillés, AV
综述了烃类的裂解机理，并讨论了不同裂解步骤的动力学和热力学意义，即起始、链扩展和终止。虽然烯烃和烷基芳烃的裂解机理已经确定，但石蜡裂解的起始步骤仍存在争议。介绍了沸石催化剂中bronsted型活性位点的作用以及框架外Al物种的可能影响，特别是当采用商业原料和工业条件时。产物分布是由每个起始步骤发生的传播事件的数量决定的，这可以通过仔细选择精确的反应条件和催化剂（包括其组成和孔拓扑结构）来控制。(C) 2000 Elsevier Science B.V.版权所有
The cracking mechanisms of hydrocarbons have been reviewed and the kinetic and thermodynamic implications of the different steps, i.e. initiation, chain propagation, and termination, have been discussed. Although the cracking mechanism of olefins and alkylaromatics is well established, the initiation step for the cracking of paraffins is still under debate. The role of Bronsted-type active sites and also the possible influence of extra-framework Al species in the case of zeolite catalysts, especially when commercial feeds and industrial conditions are employed, are presented. The product distribution is determined by the number of propagation events occurring per initiation step, and this can be controlled by carefully selecting the precise reaction conditions and the catalyst (including its composition and pore topology). (C) 2000 Elsevier Science B.V. All rights reserved.