The reactivity of methanol and methyl acetate mixtures over a HZSM-5 catalyst is studied over a period of 6 h at 350 °C, with small molecular weight olefins and aromatic compounds observed as reaction products. Post-reaction analysis of the catalyst shows the coke content to increase with methyl acetate content. Vibrational spectra (DRIFTS and inelastic neutron scattering, INS) indicate the major hydrocarbon species present in the coked catalysts to be methylated aromatic molecules, with INS spectra indicating a greater degree of methylation in the catalysts used with higher methyl acetate content. The greater extent of deactivation at higher methyl acetate concentrations is tentatively attributed to a diminishment of water in the zeolite cavity, which would otherwise facilitate re-generation of the active sites.

研究了甲醇和乙酸甲酯混合物在HZSM-5催化剂上在350°C下经过6小时的反应性，观察到小分子量的烯烃和芳族化合物作为反应产物。催化剂的反应后分析表明，焦炭含量随乙酸甲酯含量的增加而增加。振动光谱（DRIFTS和非弹性中子散射，INS）表明存在于焦化催化剂中的主要烃类是甲基化的芳族分子，INS光谱表明，使用较高乙酸甲酯含量的催化剂中甲基化程度更高。较高的乙酸甲酯浓度下更大程度的失活被暂时归因于沸石腔中水的减少，否则将促进活性部位的再生。