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OALib Journal期刊
ISSN: 2333-9721
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制备方法对ni/ceo2-al2o3催化剂甲烷部分氧化催化性能的影响
, PP. 722-728
Keywords: 甲烷,部分氧化,镍,制备方法,尖晶石
Abstract:
？采用浸渍-沉淀法、水热合成法、共沉淀法和柠檬酸络合法制备了ni/ceo2-al2o3催化剂,考察了制备方法对该催化剂的物理结构和甲烷部分氧化(pom)催化性能的影响。利用n2物理吸附、x射线粉末衍射(xrd)、h2-程序升温还原(h2-tpr)、nh3-程序升温脱附(nh3-tpd)、热重(tg)分析等手段对反应前后催化剂的物理化学性质进行了表征。实验结果表明,浸渍-沉淀法制备催化剂的活性和产物h2和co的选择性最低。而柠檬酸络合法制备的ni/ceo2-al2o3表现出最大的ch4转化率和最高的co、h2选择性。bet和xrd表征结果表明,柠檬酸络合法制备的ni/ceo2-al2o3的比表面积最大,且ceo2晶粒粒径小、分散均匀;h2-tpr测试表明,该催化剂负载的ni物种和ni与al2o3相互作用产生的尖晶石nial2o4都较容易被还原成金属ni,产生更多的活性中心;nh3-tpd和tg分析表明,该催化剂具有较多酸性位点和表面积炭,但相比较于它的高反应活性,积炭速率较低、稳定性较高。
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