Synthesis of LPG via DME from syngas in two-stage reaction system

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• 作者：Xiangang Ma ; Qingjie Ge ; ^{geqj@dicp.ac.cn} ; Junguo Ma ; Hengyong Xu
• 关键词：LPG synthesis ; Two-stage ; Syngas ; DME ; Coke burning
• 刊名：Fuel Processing Technology
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：109
• 期：Complete
• 页码：1-6
• 全文大小：973 K

文摘

Synthesis of liquefied petroleum gas (LPG) via dimethyl ether (DME) from syngas was carried out in a two-stage reaction system, where syngas was transformed to DME in the first stage over the Cu-Zn-Al/ZSM-5 catalyst and then to hydrocarbons in the second stage over the Pd-Y catalyst. CO conversion and LPG selectivity were dominated by the first and second stage, respectively. CO conversion could be kept at a high level through the gradual increase of reaction temperature of the first stage, although there was a slight deactivation for the Cu-Zn-Al/ZSM-5 catalyst. LPG selectivity in hydrocarbons was more than 75 % due to the proper pore size of Y zeolite and the presence of hydrogen. Coke deposition on Y zeolite was the reason for the decrease of LPG selectivity, but fortunately the selectivity of LPG could be recovered to a great extent by coke burning.