Cu-based catalyst is widely employed for methanol synthesis from syngas or CO₂ hydrogenation. Catalyst activation is usually considered as a preliminary step for subsequent reaction. The influence of the activation process on the catalytic performance and how the physic-chemical properties of the catalyst are modulated are still not clear. Herein, the activation of the CuZnO/SiO₂ (CZS) catalyst is studied in depth through adjusting the reduction gas velocity. The results indicate that the different activation processes reconstruct the physic-chemical properties of the CZS catalyst. After 40 h stability test, the catalytic activity decreases as the following order of CZS-120 > CZS-60 > CZS-0 catalysts (CZS-0, CZS-60 and CZS-120 catalysts represented that CuZnO/SiO₂ catalysts were pretreated with reducing gas speeds of 0 mL/min, 60 mL/min and 120 mL/min at 10 vol%H₂/N₂, respectively.). Combined with the analysis of XRD, TEM, N₂O chemisorption, H₂-TPR, XPS, H₂-TPD, CO₂-TPD characterization and experimental results, the optimized activation plays a vital role in increasing significantly the dispersion of Cu species of the catalyst and improving the Cu-ZnO interaction. This strategy provides theoretical guidance and feasible scheme for optimizing the performance of Cu-based catalyst.

Cu基催化剂广泛用于由合成气或CO ₂加氢合成甲醇。催化剂活化通常被认为是后续反应的预备步骤。活化过程对催化性能的影响以及如何调节催化剂的物理化学性质仍不清楚。在此，通过调节还原气体速度对CuZnO/SiO ₂ (CZS)催化剂的活化进行了深入研究。结果表明，不同的活化过程重建了CZS催化剂的物理化学性质。经过40 h的稳定性测试，催化活性按CZS-120 > CZS-60 > CZS-0催化剂的顺序降低（CZS-0、CZS-60和CZS-120催化剂代表CuZnO/SiO _{2在 10 vol%H 2} /N ₂下分别以 0 mL/min、60 mL/min 和 120 mL/min 的还原气体速度对催化剂进行预处理。）。结合XRD、TEM、N ₂ O化学吸附、H ₂ -TPR、XPS、H ₂ -TPD、CO ₂ -TPD表征和实验结果，优化后的活化对显着增加Cu物种的分散性起到至关重要的作用催化剂和改善Cu-ZnO相互作用。该策略为优化铜基催化剂的性能提供了理论指导和可行方案。