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杜君臣,杨海琼,张爱敏,郭淼鑫,郑婷婷,赵云昆,罗永明,黄卫强.Pd/ZrO2-Al2O3催化剂中载体制备对CH4转化活性的影响[J].稀有金属材料与工程(英文),2020,49(10):3505~3509.[du jun chen,Yang Haiqiong,Zhang Aimin,Guo Miaoxin,Zheng Tingting,Zhao Yunkun,Luo Yongming and Huang Weiqiang.Effect of Support Preparation on CH4 Conversion Activity over Pd/ZrO2-Al2O3 Catalysts[J].Rare Metal Materials and Engineering,2020,49(10):3505~3509.]
Effect of Support Preparation on CH4 Conversion Activity over Pd/ZrO2-Al2O3 Catalysts
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Received:October 16, 2019  Revised:November 25, 2019
DOI:
Key words: Pd-based catalyst  ZrO2-Al2O3  CH4 conversion  size effect  exhaust purification
Foundation item:国家自然科学基金(NO.21862010)、云南省应用基础研究计划(NO.2017FB143)、移动源污染排放控制技术国家工程实验室开放基金(NO.NELMS2017C02)、国家重点研发计划(NO.2016YFC0204902) 、昆明理工大学分析测试基金(2019P20181107010)资助
Author NameAffiliation
du jun chen,Yang Haiqiong,Zhang Aimin,Guo Miaoxin,Zheng Tingting,Zhao Yunkun,Luo Yongming and Huang Weiqiang  
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Abstract:
      Through the preparation of Pd/ZrO2-Al2O3 catalysts supported by ZrO2-Al2O3 composite oxides, the influence of the preparation of ZrO2-Al2O3 composite oxides on the low temperature CH4 oxidation activity of the catalysts were studied in a continuous flow fixed bed reactor, in order to promote the practical application of ZrO2-Al2O3 in the catalyst for natural gas vehicle exhaust purification, and to clarify the mechanism of the influence of preparation conditions on the conversion activity of the supported catalyst. The results show that the precipitation method can improve the activity of catalyst more than the impregnation method and the peptizing method; When Zr(NO3)4 is used as zirconium precursor and boehmite as aluminum precursor, high catalytic activity can be obtained; The activity of w (ZrO2): w (Al2O3)=10:90 is the highest in series of catalysts with different proportions. The structure characterization of XRD, N2 adsorption-desorption and CO pulse adsorption show that the large specific surface area, pore volume and pore diameter of ZrO2-Al2O3 composite oxides are the key factors to promote the dispersion of noble metal Pd and the conversion activity of catalyst CH4 at low temperature.