甲醇制烯烃反应中的催化剂积碳机理

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作者单位:: 中国石油乌鲁木齐石化公司研究院，新疆乌鲁木齐 830019
Research Institute，PetroChina Urumchi Petrochemical Company，Urumchi 830019，China

关键词:: 甲醇；烯烃；分子筛催化剂；积碳
methanol；olefin；molecular sieve catalyst；carbon deposition

摘要:: 摘要：MTO反应中产生的碳沉积物会导致分子筛催化剂的孔隙和活性位点的堵塞，加速其性

能下降而失去活性。文中从催化剂积碳物质形成机理出发，阐述了 MTO 反应中催化剂积碳

形成的影响因素，包括分子筛酸性、孔径结构及反应条件等；分析了积碳对催化剂及 MTO 反

应产物选择性的变化。得到结论，催化剂孔道和空腔内产生的芳香族中间物的大量沉积形成

焦炭分子是致使催化剂失活的主要原因，为改进催化剂及工艺技术开发提供研究依据。

Abstract: In the MTO reaction, the carbon deposition produced will lead to the blockage of the pores and active sites of the

molecular sieve catalyst, thus accelerating the decline of its performance and the loss of activity. Based on the formation mechanism

of catalyst carbon deposition material, this paper describedthe influencing factors of catalyst carbon deposition in MTO reaction,

including acidity of molecular sieve, pore size and reaction conditions, analyzed the change of selectivity of carbon deposition on

catalyst and MTO reaction products. The results showed that coke molecules formed by large amount of aromatic intermediates

deposited in catalyst channels and cavities during the reaction process were the main cause of catalyst deactivation, which provided

research basis for improving catalyst and technological development.