Higher resolution inspection of the hydrocarbon pool connected with the methanol-to-gasoline reaction over ZSM-5

This project involves the conversion of methanol to hydrocarbons over a zeolite catalyst. The proposed beamtime will examine systematically a series of catalyst samples prepared in the Glasgow University/ISIS catalytic reactor which has been upgraded to allow long term catalyst testing under industrially realistic conditions with full on-line analysis of the reaction products. We wish in particular to distinguish between the hydrocarbon species present in the zeolite catalyst under two different reaction regimes: low temperature (300-350 C) where major products are alkanes and aromatics, and high temperature (> 400 C) where olefin products dominate and catalyst lifetime is extended. The low frequency vibrational spectra from TOSCA will complement infrared and other characterisation measurements (NMR, TPO, EPR) on the same suite of samples.

本项目研究沸石催化剂（zeolite catalyst）作用下甲醇制烃类的转化反应。本次申请的束流时间（beamtime）将对一系列催化剂样品开展系统性表征，这些样品由格拉斯哥大学/散裂中子源ISIS的催化反应器制备，该反应器已完成升级，可在工业级实际工况下开展长期催化剂性能测试，并对反应产物进行完整在线分析。我们尤其希望区分两种不同反应工况下沸石催化剂内存在的烃类物种：其一为低温（300~350℃）工况，此时主要产物为烷烃与芳烃；其二为高温（>400℃）工况，此时烯烃产物占主导地位，且催化剂寿命更长。来自TOSCA谱仪的低频振动光谱，将与同批次样品的红外光谱及其他表征测试（核磁共振（NMR）、程序升温氧化（TPO）、电子顺磁共振（EPR））形成互补。