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 Au_xPd_y 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

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Au_xPd_y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