Abstract Synchrotron infrared micro-spectroscopy has been applied to measure in situ the reaction of dimethylether in single crystals of the silicoaluminophosphate STA-7. The crystals are found to contain a uniform and homogeneous distribution of acidic hydroxyl groups. Dimethylether is hydrogen bonded to the hydroxyl groups at low temperatures, but evidence is found for dissociation to form surface methoxy groups above 473 K, and aromatic hydrocarbon pool species above 573 K. From time resolved infrared measurements coupled with MS analysis of evolved products it is concluded that alkene formation occurs via a direct mechanism from reaction of dimethylether with surface methoxy groups. Graphical Abstract

中文翻译：

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通过 Operando 同步加速器红外显微光谱研究硅铝磷酸盐 STA-7 单晶中二甲醚的反应。

摘要 采用同步红外显微光谱技术原位测量了硅铝磷酸盐STA-7单晶中二甲醚的反应。发现晶体含有均匀分布的酸性羟基。二甲醚在低温下与羟基形成氢键，但有证据表明在 473 K 以上解离形成表面甲氧基，并在 573 K 以上解离形成芳香烃库物质。根据时间分辨红外测量与演化产物的 MS 分析，可以得出：结论是，烯烃的形成是通过二甲醚与表面甲氧基反应的直接机制发生的。图形概要