A highly selective CuAl/SiO₂ catalyst was prepared for the hydrogenation of dimethyl oxalate (DMO) and ethylene carbonate (EC) to ethanol and ethylene glycol (EG), respectively. Aluminum modified silica sol was used to prepare CuAl/SiO₂ catalysts by a hydrothermal method. The catalytic performance of the CuAl/SiO₂ catalysts with varying aluminum content was investigated at the conditions of 553 K and 2.5 MPa for DMO hydrogenation, while 453 K and 3 MPa for EC hydrogenation. The results showed that the Cu1.0Al/SiO₂ catalyst exhibited the highest selectivity of ethanol (∼94 %) in the DMO hydrogenation, while the Cu0.5Al/SiO₂ catalyst exhibited the highest selectivity of EG (∼95 %) and methanol (65 %) in the EC hydrogenation. Characterizations (e.g., TPD, TPR and XANES) indicated that the moderate aluminum modification on SiO₂ in the form of SiOHAl bond could not only tune the support acidity to polarize the CO bond of esters, but also intrinsically facilitate the dispersion of Cu active species to activate H₂, which thus facilitated the selective hydrogenation reaction to EG, ethanol and methanol.

制备了高选择性的CuAl / SiO ₂催化剂，用于分别将草酸二甲酯（DMO）和碳酸亚乙酯（EC）加氢为乙醇和乙二醇（EG）。用铝改性的硅溶胶通过水热法制备CuAl / SiO ₂催化剂。研究了不同铝含量的CuAl / SiO ₂催化剂在DMO加氢条件下的553 K和2.5 MPa，EC加氢条件下的453 K和3 MPa的催化性能。结果表明，Cu1.0Al / SiO ₂催化剂在DMO加氢中表现出最高的乙醇选择性（〜94％），而Cu0.5Al / SiO ₂催化剂催化剂在EC加氢中表现出最高的EG（〜95％）和甲醇（65％）选择性。表征（例如，TPD，TPR和XANES）表明，SiO ₂上呈Si OH Al键形式的适度铝修饰不仅可以调节载体的酸度，使酯的C O键极化，而且本质上有利于分散。 Cu活性物质可激活H ₂，从而促进了对EG，乙醇和甲醇的选择性加氢反应。