Pd/ZrO2-Al2O3催化剂中载体制备对CH4转化活性的影响  

Effect of Support Preparation on CH Conversion Activity over Pd/ZrO2-Al2O3 Catalysts

作　　者：杜君臣 杨海琼 张爱敏 郭淼鑫 郑婷婷 赵云昆 罗永明[1] 黄卫强 Du Junchen;Yang Haiqiong;Zhang Aimin;Guo Miaoxin;Zheng Tingting;Zhao Yunkun;Luo Yongming;Huang Weiqiang(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China;State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application,Kunming Sino-platinum Metals Catalysts Co.Ltd,Kunming 650106,China)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500 [2]昆明贵研催化剂有限责任公司,贵金属催化技术与应用国家地方联合工程实验室,云南昆明650106

出　　处：《稀有金属材料与工程》2020年第10期3505-3509,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(21862010);云南省应用基础研究计划(2017FB143);移动源污染排放控制技术国家工程实验室开放基金(NELMS2017C02);国家重点研发计划(2016YFC0204902);昆明理工大学分析测试基金(2019P20181107010)。

摘　　要：为推动ZrO2-Al2O3在天然气汽车尾气净化催化剂中的实际应用,并阐明其制备条件对负载催化剂转化活性的影响机制,本工作以ZrO2-Al2O3复合氧化物为载体,采用等体积浸渍法制备了Pd/ZrO2-Al2O3催化剂,并在连续流动固定床反应器上研究了ZrO2-Al2O3复合氧化物载体的制备对CH4低温氧化活性的影响。结果表明:制备方法中,相比于浸渍法和胶溶法,沉淀法更能提高催化剂活性;锆源、铝源优选中,以Zr(NO3)4为锆源、拟薄水铝石为铝源时能获得较高的催化活性;组分配比中,以质量比ZrO2:Al2O3=10:90的催化活性最高。XRD、低温N2吸附、CO脉冲吸附的结构表征表明,ZrO2-Al2O3复合氧化物的大的比表面积、孔容、孔径是促进贵金属Pd分散,提升催化剂低温CH4转化活性的关键因素。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 Pd/ZrO2-Al2O3 catalysts supported by ZrO2-Al2O3 composite oxides were prepared.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.The results show that the precipitation method can improve the activity of catalyst more effectively than the impregnation method and the peptizing method.When Zr(NO3)4 is used as the zirconium precursor and boehmite as the aluminum precursor,high catalytic activity can be obtained.The activity ofω(Zr O2):ω(Al2O3)=10:90 is the highest in the series of catalysts with different proportions.The structure characterization of XRD,N2 adsorption-desorption and CO pulse adsorption shows 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.

关 键 词：Pd基催化剂 ZRO2-AL2O3 CH4转化 尺寸效应 尾气净化 

分 类 号：O614.82+3[理学—无机化学] O643.36[理学—化学]