Pd/ZnO催化剂的还原及其催化甲醇水蒸气重整制氢

催化学报 , 2007, 28(3): 234-238.

Pd/ZnO催化剂的还原及其催化甲醇水蒸气重整制氢

王艳华 ^1, , 张敬畅 ^2, , 徐恒泳 ^3, , 白雪峰 ^4,

1.黑龙江省石油化学研究院,黑龙江哈尔滨,150040

2.北京化工大学现代催化研究所,北京,100029

3.中国科学院大连化学物理研究所,辽宁大连,116023

4.黑龙江省石油化学研究院,黑龙江哈尔滨,150040

关键词：钯 , 氧化锌 , 负载型催化剂 , 甲醇水蒸气重整 , 钯锌合金 , 活性物种 , 还原

Reduction of Pd/ZnO Catalyst and Its Catalytic Activity for Steam Reforming of Methanol

考察了共沉淀法制备的15.9%Pd/ZnO催化剂的还原对甲醇水蒸气重整制氢反应的影响. 结果显示,当催化剂的还原温度为523～573 K时, 523 K下反应的甲醇转化率达到了41.6%, CO2选择性为94.6%, 出口CO浓度为1.26%. X射线衍射结果显示,当催化剂的还原温度为523 K时PdZn合金开始形成. 还原温度为523～573 K范围内催化剂活性的提高归因于 5～14 nm PdZn合金粒子的存在. 用程序升温还原及X射线衍射表征手段探究了还原过程中Pd与ZnO之间的相互作用. 结果表明, Pd/ZnO可能经历了PdO/ZnO→Pd/ZnO→PdZnO1-x/ZnO→PdZn合金/ZnO的还原过程,而部分PdZn合金在反应过程中可重新被氧化成PdZnO1-x. 对反应的活性物种进行了初步探讨.

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Pd/ZnO催化剂的还原及其催化甲醇水蒸气重整制氢

Reduction of Pd/ZnO Catalyst and Its Catalytic Activity for Steam Reforming of Methanol

参考文献