Abstract: The steam reforming of methanol on Pd/ZnO catalysts prepared by co-precipitation was studied in a stainless reactor under various conditions. The effects of Pd loading, reduction temperatures, reaction temperatures, weight hourly space velocity (WHSV) and molar ratio of water to methanol on the steam reforming of methanol to hydrogen were investigated. The results showed that when the mass fraction of metallic palladium was 15.9%, reaction temperature was 523—573 K, reduction temperature was 523—573 K, molar ratio of water to methanol was 1.0—1.2 and WHSV was 17.2 h^-1, higher methanol conversion, higher CO₂ selectivity, higher hydrogen yield and lower outlet CO molar fraction were achieved. The stability tests over 15.9% Pd/ZnO and the commercial CuO/ZnO/Al₂O₃ catalyst were made at 573 K. The results showed that the methanol conversion over 15.9% Pd/ZnO remained constant for 8 h without deactivation. On the contrary, the methanol conversion over CuO/ZnO/Al₂O₃ catalyst gradually decreased with time on stream by 14.4%. So Pd/ZnO catalysts display better stability.

摘要： 研究了并流共沉淀法制备的Pd/ZnO催化剂上的甲醇水蒸气重整制氢反应.考察了钯含量、还原温度、反应温度、重时空速（WHSV）和水-甲醇摩尔比（水醇比）对反应的影响.研究结果表明，当钯质量分数为15.9%，反应温度为523～573 K，还原温度为523～573 K，水醇比为1.0～1.2，WHSV=17.2 h^-1时，反应具有较好的CH3OH转化率、CO₂选择性、H₂产率及较低的出口CO摩尔分数.与铜基催化剂相比，Pd/ZnO催化剂表现出较好的稳定性.