AlPO类分子筛上甲醇制烯烃反应机理及吸附和扩散性能研究

甲醇制烯烃（MTO）作为一种替代传统石油裂解制烯烃的可持续发展方法，是当今多相催化领域的研究热点。MTO反应的机理，尤其是反应过程有机中间活性物种的表征，是亟待解决的难点。在此背景下，本项目将围绕MTO的反应机理开展研究。以含有微量Br?nsted酸（简称B酸）的AlPO类分子筛为研究对象，利用原位红外-紫外可见-无机质谱联用技术、固体核磁共振技术对MTO诱导期有机物种的形成过程进行监测；利用全自动气体吸附仪和脉冲梯度场固体核磁共振仪，对样品在MTO过程中的吸附和扩散性能进行分析。以此，完善MTO反应和失活的机理，并建立一套MTO机理的表征方法。本项目对其他多相催化反应的机理研究及工业用催化剂的设计开发都具有一定的指导意义。

As an alternative process for obtaining olefins, the methanol-to-olefin (MTO) conversion has attracted extensive attentions in recent years. As an important issue for MTO mechanism, the formation process of hydrocarbon pool species is still not clear until now. In this case, the present work will focus on the mechnisam of MTO conversion. AlPO-zeolites with trace amounts of Br?nsted acid sites will be used as MTO catalysts, and the hydrocarbon pool species formed during the MTO conversion on the catalysts will be monitored in situ by FTIR-UV/Vis-MS and 13C MAS NMR spectroscopy. Furthermore, the catalysts after different reaction time will be taken from the fixed-bed for the measurements of methanol adsorption and olefin diffusion, via intelligent gravimetric analyzer and pulsed-field gradient (PFG) NMR spectroscopy. Based on the above-mentioned results, we will establish a set of method for investigating the machanism of MTO conversion. It is great helpful to develop new MTO industrial catalyst and investigate the mechanism of other heterogeneous catalytic reaction.