An ultraviolet Raman spectroscopic study of coke formation in methanol to hydrocarbons conversion over zeolite H-MFI
An ultraviolet Raman spectroscopic study of coke formation in methanol to hydrocarbons conversion over zeolite H-MFI
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DOI：
10.1016/s0021-9517(02)00026-x
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发表时间：
2003-01-01
影响因子：
7.3
通讯作者：
Stair, PC
中科院分区：
文献类型：
--
作者：
Chua, YT;Stair, PC
用紫外拉曼光谱研究了甲醇和二甲醚在H-MFI分子筛上转化制烃过程中残留烃或焦炭的形成。从拉曼光谱中，在保留的烃类中鉴定出聚烯烃、聚烯烃和多环芳烃。结果强烈支持的反应机制，提出了以前，其中的芳香族和多环芳烃的扩环形成中的关键中间体被确定为一个物种。光谱还表明，多环芳烃具有类似于多烯的链状拓扑结构，而不是类似于芘或晕苯的二维片状拓扑结构。(C)2003 Elsevier Science（美国）。All rights reserved.
The formation of retained hydrocarbons or coke in the conversion of methanol and dimethylether to hydrocarbons over zeolite H-MFI was studied using ultraviolet Raman spectroscopy. Polyolefin, cyclopentadienyl species, and polyaromatic hydrocarbons have been identified among the retained hydrocarbons from the Raman spectra. The results strongly support a reaction mechanism, proposed previously, where cyclopentadienyl species are identified as a key intermediate in the formation of aromatic and polyaromatic hydrocarbons by ring expansion. The spectra also suggest that the polyaromatic hydrocarbons have a chain-like topology, similar to polycenes, rather than a two-dimensional, sheet-like topology, similar to pyrene or coronene. (C) 2003 Elsevier Science (USA). All rights reserved.