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Dimethyl ether Carbonylation over Mordenite zeolite modified by Alkyimidazolium ions
Catalysis Communications ( IF 3.4 ) Pub Date : 2020-09-05 , DOI: 10.1016/j.catcom.2020.106161
Shiping Liu , Xudong Fang , Yong Liu , Hongchao Liu , Xiangang Ma , Wenliang Zhu , Zhongmin Liu

Acidic mordenite zeolite was modified with various alkyimidazolium ions with different sizes via ion-exchange and applied as dimethyl ether (DME) carbonylation catalysts. Introducing 1, 3-dimethylimidazolium ions into zeolite can selectively remove the acid sites in 12-membered ring (MR) channels, significantly enhancing the stability and activity. Additionally, ion-exchange with organic ions was used to control the acid site distributions to separately investigate the DME carbonylation reaction in 8-MR and 12-MR channels. The reaction results indicated that the acid sites in 12-MR channels can concurrently catalyze the carbonylation and methanol-to-hydrocarbons (MTH) reactions, and MTH reactions seriously suppress the carbonylation activity in 8-MR channels.



中文翻译:

烷基咪唑鎓离子修饰的丝光沸石上的二甲醚羰基化

酸性丝光沸石通过离子交换用各种尺寸的烷基咪唑鎓离子改性,并用作二甲醚(DME)羰基化催化剂。在沸石中引入1,3-二甲基咪唑鎓离子可以选择性地去除12元环(MR)通道中的酸位,从而显着提高稳定性和活性。此外,使用有机离子进行离子交换来控制酸位点分布,以分别研究8-MR和12-MR通道中的DME羰基化反应。反应结果表明,在12-MR通道中的酸性位点可以同时催化羰基化反应和甲醇制烃(MTH)反应,而MTH反应会严重抑制8-MR通道中的羰基化活性。

更新日期:2020-09-12
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