Towards an improved understanding of the interaction of methanol over zeolite catalysts

Is room temperature methoxylation possible? The Methanol-to-Hydrocarbons reaction converts methanol to gasoline grade hydrocarbons via a solid acid catalyst (e.g. ZSM-5 and SAPO-34). Through previous experiments, INS has been used to characteristic the form of the 'hydrocarbon pool' that facilitates reaction. However, how the first hydrocarbons are produced is not fully understood. It is reported that methanol first methoxylates at temperatures above 200C to give surface methoxy species, which then reacts further. More recently, INS has indicated that this reaction could be taking place at room temperature. This proposal seeks to further develop our understanding of how methanol initially adsorbs on a sample of pre-treated ZSM-5 and SAPO-34. Comparisons between the two samples will discern how different degrees of surface acidity perturb low temperature methanol adsorption/reaction.

室温甲氧基化反应是否可行？甲醇制烃（Methanol-to-Hydrocarbons）反应通过固体酸催化剂（如ZSM-5与SAPO-34）将甲醇转化为汽油级烃类产物。过往实验中，非弹性中子散射（Inelastic Neutron Scattering，INS）被用于表征促进该反应的"烃池"结构。然而，首批烃类的生成机制尚未完全阐明。据报道，甲醇需在200摄氏度以上的温度下先发生甲氧基化反应，生成表面甲氧基物种，随后再进行进一步反应。近期的非弹性中子散射研究表明，该反应或许可在室温下进行。本研究计划旨在进一步阐明甲醇在经预处理的ZSM-5与SAPO-34样品表面的初始吸附过程。通过对比这两种催化剂样品，可明确不同程度的表面酸性如何影响低温下甲醇的吸附与反应过程。