High Activity and Selectivity towards Ethyl Methyl Carbonate through Optimizing Surface Acidity and Alkalinity of the Transesterification Catalyst

• Published in: ChemistrySelect (Weinheim) 2023-02, Vol.8 (8), p.n/a
• Main Authors: Yan, Pinmei, Zhang, Xin, Huang, Yuanyuan, Liu, Gengwei, Liu, Peng, Li, Chenjie, Pan, Pengbin, Yao, Yuangen
• Format: Article
• Language: English
• Subjects: Desilication; Reactive distillation; Surface acidity; Transesterification; Wet impregnation
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202203952

Ethyl methyl carbonate (EMC) is the product of the partial transesterification of dimethyl carbonate (DMC) with ethanol (EtOH). How to modulate the catalyst with suitable acidity and alkalinity is of key importance for achieving both high activity and selectivity toward EMC. Herein, an Mg−Zn−P/AT‐ZSM‐5 catalyst with moderate basicity and moderate acidity was intelligently designed by the co‐doping of Mg−Zn−P after the desilication of ZSM‐5. Under the optimized reaction conditions, the EtOH conversion can reach 99.1 % with a high EMC selectivity of 96.3 %. Based on the results of multiple characterizations, the enhanced EtOH conversion and high EMC selectivity should be attributed to the well dispersed supported metal species, and enhanced metal‐support interactions, especially the suitable surface acidity and alkalinity property of the catalyst. Such work provides a more reasonable design strategy for the preparation of a catalyst used for the transesterification reaction of DMC and EtOH to selectively produce high‐valued EMC. After desilication, the catalyst structure remained unchanged, the pore size increased, the number of mesoporous pores increased, the specific surface area increased, the alkalinity increases, and the strong acid site disappears. After oxides loading, medium strong alkalinity and medium strong acidity increased further. The higher the base strength, the higher the negative charge on EtOδ−, to facilitate the reaction.