Direct dimethyl ether (DME) synthesis from CO₂ and H₂ is considered a promising production route. However, this process is thermodynamically and kinetically restricted by the presence of water as a byproduct. In this study, a water-conduction membrane was incorporated into the direct DME synthesis reactor to generate a dry reaction environment. In the absence of water, the activities of the CO₂ hydrogenation catalyst (CZA) and methanol dehydration catalyst (HZSM-5) were boosted 4- and 10-fold, respectively, and single-pass CO₂ conversion of up to 73.4%, far beyond equilibrium, and DME yields of up to 54.5% were obtained. Moreover, the good protection of the catalysts against fast deactivation was demonstrated.

中文翻译：

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在干燥反应环境中由CO2和H2高产率直接合成二甲醚

从CO ₂和H ₂直接合成二甲醚（DME）被认为是一种有前途的生产途径。然而，该过程受到水作为副产物的热力学和动力学限制。在这项研究中，将导水膜结合到直接DME合成反应器中以产生干燥的反应环境。在没有水的情况下，CO ₂氢化催化剂（CZA）和甲醇脱水催化剂（HZSM-5）的活性分别提高了4倍和10倍，单程CO ₂转化率高达73.4％，远远超出平衡，DME的收率高达54.5％。此外，证明了催化剂对快速失活的良好保护。