Improving the stability of Cu-based catalysts, especially in the presence of water, has always been a great challenge. The hydrophobization strategy and effects on the catalyst surface property and catalytic performance deserve rigorous investigations. Herein, the hydrophobic modified silica was introduced as a support for CuZn catalyst to hinder the adsorption of water on active sites of Cu-based catalysts, thereby improving its stability. And silane agents (methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane) were selected to modify the SiO₂ surface by a reaction between the silane agent and the hydroxyl groups on the silica surface. After modification, the catalysts exhibited the better stability for methanol synthesis in the presence of water. FT-IR, BET, H₂-TPR, XRD, TEM, XPS characterization were employed to determine the surface physical properties, reduction properties, crystal structure and particle size of the catalysts before and after the reaction. The results showed that water can simultaneously cause the oxidation and growth of Cu species resulting in the deactivation of Cu-based catalyst. However, the introduction of hydrophobic groups reduced the contact time between water and the active center, which prevented the growth and oxidation of Cu species, thus improving the catalyst stability.

提高铜基催化剂的稳定性，尤其是在水存在下的稳定性，一直是一个巨大的挑战。疏水化策略及其对催化剂表面性质和催化性能的影响值得深入研究。在此，疏水改性二氧化硅被引入作为CuZn催化剂的载体，以阻碍水在Cu基催化剂活性位点上的吸附，从而提高其稳定性。并选择硅烷试剂（甲基三甲氧基硅烷、乙基三甲氧基硅烷、丙基三甲氧基硅烷）通过硅烷试剂与二氧化硅表面的羟基反应对SiO ₂表面进行改性。改性后的催化剂在水存在下对甲醇合成表现出更好的稳定性。FT-IR、BET、H ₂-TPR、XRD、TEM、XPS表征用于测定反应前后催化剂的表面物理性质、还原性质、晶体结构和粒径。结果表明，水可以同时引起Cu物种的氧化和生长，从而导致Cu基催化剂失活。然而，疏水基团的引入减少了水与活性中心之间的接触时间，从而阻止了铜物种的生长和氧化，从而提高了催化剂的稳定性。