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Size Effect on Diffusion and Catalytic Performance of Mordenite in Dimethyl Ether Carbonylation

Authors :
Chenchen Dong
Yunduo Liu
Yumeng Xia
Hu Liu
Yan Zhang
Shouying Huang
Xinbin Ma
Source :
Catalysts, Vol 13, Iss 7, p 1049 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

The carbonylation of dimethyl ether (DME) to produce methyl acetate (MA) has a promising prospect in industry. Mordenite (MOR) has been widely studied due to its excellent catalytic activity and high MA selectivity; however, its microporous characteristic limits the intracrystalline diffusion that influences the activity and stability. Therefore, it becomes essential to clarify the relationship between catalytic activity and diffusion. In this study, a series of MOR samples with similar Si/Al contents and aspect ratios, but different sizes, were successfully synthesized by adjusting the synthesis parameters (Si/Al contents in gel, aging time, the amount of water, and alkalinity). Based on quantitative analysis of acid properties and catalyst evaluation, both the apparent turnover frequency of MA (TOFMA) and the stability decrease with the increase in particle size. Diffusion parameter measurements and kinetic analysis via zero length column methods show that the intracrystalline diffusion restriction becomes more serious with increasing particle size. The larger the MOR crystals with enhanced mass transfer limitation that undergo lower activity, the higher the selectivity of byproducts, as well as the faster their deactivation.

Details

Language :
English
ISSN :
20734344
Volume :
13
Issue :
7
Database :
Directory of Open Access Journals
Journal :
Catalysts
Publication Type :
Academic Journal
Accession number :
edsdoj.1587d3cb96a3434db6ffb30ba9457808
Document Type :
article
Full Text :
https://doi.org/10.3390/catal13071049