化工学报 ›› 2008, Vol. 59 ›› Issue (4): 898-903.

• 催化、动力学与反应器 • 上一篇    下一篇

载体对Au-Pd催化剂甲醇部分氧化性能的影响

陈清波;罗来涛;王建鑫   

  1. 南昌大学应用化学研究所,江西 南昌 330031
  • 出版日期:2008-04-05 发布日期:2008-04-05

Effect of supports on activity of Au-Pd catalysts for partial oxidation of methanol

CHEN Qingbo;LUO Laitao;WANG Jianxin   

  • Online:2008-04-05 Published:2008-04-05

摘要:

采用沉积沉淀法制备了一系列Au-Pd双金属催化剂,研究了不同载体对Au-Pd双金属催化剂甲醇部分氧化性能的影响,并运用XRD、TPD和TPR等手段对催化剂进行了表征。结果表明,Au-Pd/CeO2催化剂中形成的AuxPdy合金和氧空穴较多,致使Au-Pd/CeO2催化剂的活性较高;CeO2-TiO2和CeO2-ZrO2复合载体较大的比表面积和固溶体的形成有利于H2选择性的提高;Au-Pd/CeO2-ZrO2和Au-Pd/CeO2-TiO2催化剂有较高H2产率的主要原因是H2选择性的提高。

关键词: Au-Pd催化剂, 甲醇部分氧化, 复合载体, 制氢, 沉积沉淀

Abstract:

Au-Pd catalysts were prepared by the deposition-precipitation method, and their activities for partial oxidation of methanol were evaluated. XRD, TPR and TPD were used to characterize the catalysts.In comparison to Au-Pd/CeO2-ZrO2 and Au-Pd/CeO2-TiO2 catalysts, the activity of Au-Pd/CeO2 catalyst for partial oxidation of methanol was higher, which can be related to the formation of more AuxPdy alloy and more oxygen vacancies.The hydrogen selectivity of Au-Pd/CeO2 was improved by using additional support (ZrO2 or TiO2), probably due to a combination of different factors, such as increasing active surface area and dispersion.A higher hydrogen yield was found for Au-Pd/CeO2-ZrO2 and Au-Pd/CeO2-TiO2 catalysts because of their higher hydrogen selectivity.

Key words: Au-Pd催化剂, 甲醇部分氧化, 复合载体, 制氢, 沉积沉淀