Xu Feng, Zheng Junlin, Li Junhui, Zhu Zhirong
School of Chemical Science and Engineering, Tongji University, Shanghai 200092, P.R. China.
Sinopec Shanghai Research Institute of Petrochemical Technology Co., Ltd., Shanghai 201208, P.R. China.
iScience. 2025 Feb 25;28(4):112102. doi: 10.1016/j.isci.2025.112102. eCollection 2025 Apr 18.
A series of mordenites with different degree of dealumination were obtained by the acidic treatment and their catalytic properties in DME (dimethyl ether) carbonylation reaction were investigated. As a result, mild acid treated mordenite with low concentration can remove the extra-framework Al species only and open the side pocket, therefore increasing the amount of strong acid sites in it. Due to the increased accessibility of acid sites in the side pocket, the dealuminated mordenite showed a high catalytic activity in DME carbonylation reaction. Increasing the degree of dealumination of mordenite can preferentially destroy the framework Al atoms in side pocket. Therefore, the mordenite with severe dealumination exhibited a low activity in DME carbonylation reaction for reduced acid sites in the side pocket. Mild dealumination of mordenite can increase the catalytic activity in DME carbonylation reaction by 40% as compared to the parent mordenite in this work.
通过酸处理获得了一系列不同脱铝程度的丝光沸石，并研究了它们在二甲醚（DME）羰基化反应中的催化性能。结果表明，用低浓度的温和酸处理丝光沸石只能去除骨架外的铝物种并打开侧袋，从而增加其中强酸位点的数量。由于侧袋中酸位点的可及性增加，脱铝丝光沸石在DME羰基化反应中表现出高催化活性。提高丝光沸石的脱铝程度会优先破坏侧袋中的骨架铝原子。因此，严重脱铝的丝光沸石在DME羰基化反应中表现出低活性，因为侧袋中的酸位点减少。在这项工作中，与母体丝光沸石相比，丝光沸石的轻度脱铝可使DME羰基化反应中的催化活性提高40%。
