Cu-based catalysts play pivotal role in many industrial processes, however, its application under high temperature is restricted due to the low Tammann temperature of Cu. Improving the stability and activity of Cu-based catalysts at high temperature is a challenge. In this work, a stable Cu/ZnO@SiO₂ catalyst was prepared, in which silicon was introduced into CuZn-BTC precursor via a steam-assisted hydrolysis method before calcination and reduction. Characterizations found that Cu/ZnO@SiO₂ catalyst prepared via above strategy possesses increased surface area, more exposed active sites and excellent stability for ethanol dehydrogenation than Cu/ZnO (prepared from CuZn-BTC without SiO₂). It was confirmed that the space-time yield of acetaldehyde reached 9.0 g-acetaldehyde/g-cat/h, and Cu/ZnO@SiO₂ could maintain its activity within 200 h at 350 °C due to the ZnO decorated Cu particles (Cu/ZnO) were encapsulated in the octahedral shaped SiO₂ hollow.

铜基催化剂在许多工业过程中起着举足轻重的作用，但由于铜的塔曼温度低，其在高温下的应用受到限制。提高铜基催化剂在高温下的稳定性和活性是一个挑战。在这项工作中，制备了一种稳定的 Cu/ZnO@SiO ₂催化剂，其中在煅烧和还原之前通过蒸汽辅助水解法将硅引入到 CuZn-BTC 前驱体中。表征发现，通过上述策略制备的 Cu/ZnO@SiO _{2催化剂比 Cu/ZnO（由不含 SiO 2}的 CuZn-BTC 制备）具有更大的表面积、更多暴露的活性位点和优异的乙醇脱氢稳定性). 经证实，乙醛的时空产率达到 9.0 g-乙醛/g-cat/h，Cu/ZnO@SiO ₂由于 ZnO 修饰的 Cu 颗粒（Cu /ZnO)被封装在八面体形状的SiO ₂空心中。