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用红外光谱、氘交换及脉冲催化反应综合考察了甲醇与丙烯在HZSM-5型沸石上的吸附及催化转化。发现甲醇在<120℃下抽空活化的HZSM-5上吸附时,在一些强质子酸中心有甲氧基生成,而室温下甲醇是以分子间氢键缔合成多聚物的形式吸附在HZSM-5表面上。丙烯在该沸石上强质子酸中心吸附时,双键立即被打开,生成正碳离子。丙烯芳构化和烷基化等都属正碳离子机理。最后讨论了甲醇在反应条件下于HZSM-5上催化转化成汽油的反应机理。
Adsorption and catalytic conversion of methanol and propylene on HZSM-5 zeolite were investigated by IR, deuterium exchange and pulse catalytic reaction. Methanol was found to be methylated at some centers of strong protonic acids when adsorbed on HZSM-5 evacuated at <120 ° C. At room temperature, methanol was adsorbed on the HZSM- 5 on the surface. When propylene is adsorbed on the strong protonic acid center of the zeolite, the double bond is immediately opened to generate positive carbon ions. Propylene aromatization and alkylation are positive carbon ion mechanism. Finally, the reaction mechanism of methanol catalyzed conversion to gasoline over HZSM-5 under the reaction conditions was discussed.