Experimental implementation of a catalytic membrane reactor for the direct synthesis of DME from H2+CO/CO2

The direct synthesis of dimethyl ether (DME) by the hydrogenation of CO2 and CO2/COx mixtures has been studied in an original packed bed membrane reactor (PBMR). The role of the hydrophilic LTA zeolite membrane is to remove H2O from the reaction medium, reducing therefore the thermodynamic limitations of methanol synthesis and dehydration stages. LTA zeolite has the best permeation properties among the studied zeolites (LTX and SOD). The experiments were carried out using a CuO-ZnO-ZrO2/ SAPO-11 catalyst at 275-325 degrees C, 10-40 bar, space time of 10 gcat h (molC)(-1) and using in the permeate section a sweeping gas flowrate of the same composition as that fed to the reaction section. The results (DME yield, CO2 conversion and product distribution) of the PBMR are compared with those obtained in PBR without membrane. In the hydrogenation of CO2, a DME yield of 12% and a CO2 conversion of 20% are obtained at 275 degrees C, 40 bar and space time of 10 gcat h (molC)(-1) with a great catalyst stability. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The study focuses on the direct synthesis of dimethyl ether (DME) by hydrogenation of CO2 in a packed bed membrane reactor (PBMR) using a hydrophilic LTA zeolite membrane to remove water, thereby improving the efficiency of methanol synthesis and dehydration stages. The results show good DME yield and CO2 conversion rate under certain conditions with high catalyst stability.