Abstract

The purpose of methanol to gasoline (MTG) is mainly to prepare gasoline with high octane number during the oil crisis. Weight ratio of aromatics in MTG products is only 35-40%, far lower than that (90%) of aromatics in methanol to aromatics (MTA) product. From the molecular viewpoint, the formation of aromatics is a carbon-carbon chain increasing process, which underwent the dehydration of methanol, the formation of short-chain olefins, such as ethylene or propylene and the aromatization of short-chain olefins. Since olefins are the intermediate product, MTA can be considered as a process longer than methanol to olefin (MTO). The conversion of MTA mostly followed a consecutive route, under the assistance of high temperature. High-temperature reaction process always resulted in the deactivation of catalyst, for example, in fluid catalytic cracking (FCC) process or methanol synthesis. In FCC process, the main course of catalyst deactivation was due to the coke deposition, which blocked the channel of zeolite.

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