Two steps of dimethyl ether (DME) synthesis from CO₂ and H₂ in a batch reactor were studied, including CO₂ hydrogenation to methanol through ethanol-assisted method and methanol dehydration to DME. Additions of 10 wt% ZrO₂, Al₂O₃ and ZrO₂–Al₂O₃ into Cu/ZnO were investigated in low-temperature methanol synthesis using ethanol as catalytic solvent. Suitable zeolite (ZSM-5 and ferrierite) for methanol dehydration was also determined. Ethanol-assisted method offered high methanol yield and Cu/ZnO/ZrO₂ catalyst provided the highest CO₂ conversion (82.1%) and methanol yield (60.8%) at 150 °C and 50 bar since ZrO₂ decreased CuO crystallite sizes and increased surface areas of the catalyst. For methanol dehydration to DME, zeolite's strong acidity related to DME formation. The Cu/ZnO/ZrO₂ - Ferrierite provided the highest DME productivity at 0.44 mmol_DME/g_cat. In addition, DME synthesis from CO₂ and H₂ through ethanol-assisted methanol synthesis and methanol dehydration can be a potential method to simultaneously produce DME and ethylene. Under the operating conditions, ethylene was produced as a valued by-product of 5.65 mmol_Ethylene/g_cat from dehydration of ethanol. In this study, rather high methanol yield was obtained from ethanol-assisted method. However, DME yield can be further improved by increasing synthesis temperature.

研究了在间歇反应器中CO ₂和H ₂合成二甲醚（DME）的两个步骤，包括通过乙醇辅助法CO ₂加氢制甲醇和甲醇脱水制DME。在以乙醇为催化溶剂的低温甲醇合成中研究了在 Cu/ZnO 中添加 10 wt% ZrO ₂、Al ₂ O ₃和 ZrO ₂ –Al ₂ O _{3 。}还确定了适合甲醇脱水的沸石（ZSM-5 和镁碱沸石）。乙醇辅助法提供高甲醇收率，Cu/ZnO/ZrO ₂催化剂提供最高 CO ₂在 150 °C 和 50 bar 条件下的转化率 (82.1%) 和甲醇收率 (60.8%)，因为 ZrO ₂减小了 CuO 晶粒尺寸并增加了催化剂的表面积。对于甲醇脱水生成二甲醚，沸石的强酸性与二甲醚的形成有关。Cu/ZnO/ZrO _{2 - 镁碱沸石以 0.44 mmol DME} /g _cat提供最高的 DME 产率。此外，通过乙醇辅助甲醇合成和甲醇脱水从CO ₂和H ₂合成二甲醚可能是同时生产二甲醚和乙烯的潜在方法。在操作条件下，乙烯作为有价值的副产品产生 5.65 mmol_乙烯/g _cat来自乙醇的脱水。在本研究中，乙醇辅助法获得了相当高的甲醇收率。然而，通过提高合成温度可以进一步提高二甲醚的收率。