通过同步辐射红外显微光谱研究二甲醚在硅铝磷酸盐STA-7单晶中的反应。
Reactions of Dimethylether in Single Crystals of the Silicoaluminophosphate STA-7 Studied via Synchrotron Infrared Microspectroscopy.
作者信息
Howe Russell F, Price David J, Castro Maria, Wright Paul A, Greenaway Alex, Frogley Mark D, Cinque Gianfelice
机构信息
1Chemistry Department, University of Aberdeen, Aberdeen, AB24 3UE UK.
2Chemistry Department, University of Jember, Jember, Jawa Timur 68121 Indonesia.
出版信息
Top Catal. 2018;61(3):199-212. doi: 10.1007/s11244-018-0890-9. Epub 2018 Jan 16.
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.
摘要
同步辐射红外显微光谱已被用于原位测量二甲醚在硅铝磷酸盐STA-7单晶中的反应。发现该晶体含有均匀且同质分布的酸性羟基。在低温下，二甲醚通过氢键与羟基相连，但有证据表明在473 K以上会发生解离形成表面甲氧基，在573 K以上会形成芳烃池物种。通过时间分辨红外测量以及对逸出产物的质谱分析得出结论，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。
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