Direct conversion of CO2 to dimethyl ether in a fixed bed membrane reactor: Influence of membrane properties and process conditions

The direct hydrogenation of CO2 to dimethyl ether (DME) is a promising technology for valorisation. In this work, 1D phenomenological reactor model developed evaluate and optimize the performance membrane conversion, otherwise limited by thermodynamic equilibrium temperature gradients. co-current circulation sweep gas stream through permeation zone promotes both water heat removal from reaction zone, thus increasing overall DME yield (from 44% 64%). properties in terms permeability (i.e., 4·10?7 mol·Pa?1m?2s?1) selectivity 50 towards H2, 30 CO, 10 methanol), optimal have been determined considering, first time, non-ideal separation non-isothermal operation. Thus, work sheds light into suitable materials applications. Then, was analysed as function process parameters feed flow ratio, gradient total pressure across membrane, inlet composition). Owing its ability remove 96% produced reaction, proposed outperforms conventional packed bed same application with 36% 46% improvement conversion yield, respectively). results demonstrate potential make feasible process.