陈化时间对CuO/ZnO/CeO<sub>2</sub>/ZrO<sub>2</sub>甲醇水蒸气重整制氢催化剂性能的影响

陈化时间对CuO/ZnO/CeO₂/ZrO₂甲醇水蒸气重整制氢催化剂性能的影响

摘要: 采用共沉淀法制备了CuO/ZnO/CeO₂/ZrO₂甲醇水蒸气重整催化剂,探讨了陈化时间对催化剂性能的影响.结果发现,延长陈化时间能增加催化剂的表面铜原子数和改善催化剂的还原性能,但与此同时也降低了催化剂的储放氧性能.延长陈化时间,CuO/ZnO/CeO₂/ZrO₂催化剂的氢产率随表面铜原子数的增加而成线性增长.另一方面,重整尾气中的CO含量也随着储放氧能力的下降而增加.综合考虑产氢率和重整尾气中CO含量,最佳陈化时间为2h,此时,CuO/ZnO/CeO₂/ZrO₂催化剂表现出了最佳性能.

Abstract: CuO/ZnO/CeO₂-ZrO₂ catalysts for methanol steam reforming (MSR) were prepared by a co-precipitation procedure, and the effects of precipitation aging time on the catalytic performance were investigated. It was found that the prolonged precipitation aging time increased the surface Cu atoms and improved the reducibility of catalyst, but decreased the oxygen storage capacity. A nearly linear increase between the surface Cu atoms and H₂ production rate was obtained in prepared CuO/ZnO/CeO₂-ZrO₂ catalysts with prolonged precipitation aging time. However, CO concentration increased with the decrease of the oxygen storage capacity. Considering the H₂ production rate and CO level, the optimal precipitation aging time was 2 h. CuO/ZnO/CeO₂-ZrO₂ prepared using this aging time exhibited the best activity with suppressed CO formation.