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制备了一种新型Ni掺杂多层纳米结构牡丹花状CeO2材料,研究了其催化性能,同时与Ni负载牡丹花状CeO2样品进行了比较.结果表明,Ni掺杂CeO2样品具有纳米晶粒和开放的介孔结构,特殊的形貌使其在CO氧化和甲烷部分氧化反应中具有独特的催化特性.Ni掺杂后,CeO2中产生了多余氧空位,同时其氧化还原活性也增强,其在CO氧化反应中的催化活性明显高于纯CeO2和Ni负载CeO2样品;在甲烷部分氧化反应中,牡丹花状CeO2负载3atm%Ni催化剂样品上甲烷转化率高于所有Ni掺杂的催化剂样品.但是在Ni负载型催化剂和花状CeO2催化剂上,甲烷的起始转化温度为400oC,而5.7atm%Ni的掺杂使其降至340oC.
A new Ni-doped multilayer nanostructured peoniflorous CeO2 material was prepared and its catalytic performance was studied.Microstructural properties of Ni-doped peoniflorous CeO2 were compared with that of the Ni-loaded peoniflorous CeO2 sample.The results show that the Ni-doped CeO2 sample has nano- The open mesoporous structure and special morphology make it have unique catalytic properties in CO oxidation and partial oxidation of methane.Ni-doping results in excess oxygen vacancies in CeO2 and its redox activity is enhanced The catalytic activity of CO oxidation was significantly higher than that of pure CeO2 and Ni-supported CeO2 samples. In the partial oxidation of methane, the methane conversion of peat flower-like CeO2-supported 3 atm% Ni catalyst samples was higher than that of all Ni-doped catalyst samples. On the Ni-supported catalyst and the flower-like CeO2 catalyst, the initial conversion temperature of methane was 400oC, while the addition of 5.7atm% Ni reduced it to 340oC.