摘要
采用不同制备方法合成不同性质的CeO_(2)载体,并制备负载型Co_(3)O_(4)/CeO_(2)催化剂应用于丙烷完全氧化反应。结果表明,部分CO_(2)+进入CeO_(2)晶格中形成固溶体,改变了CeO_(2)的晶格结构并产生氧空位。氧空位的数量与不同性质的CeO_(2)密切相关,影响催化剂上氧物种的可还原性,从而对反应行为产生影响。其中,以沉淀法制备的CeO_(2)为载体的5Co/CeO_(2)-C催化剂活性最佳(T_(90)=320℃),可归因于该催化剂中较高氧空位浓度导致的最佳低温可还原性。此外,该催化剂还具有良好的稳定性和抗水性能。
CeO_(2)oxides prepared with different methods were used for supports of Co_(3)O_(4)/CeO_(2)catalysts,and the catalysts were tested in propane oxidation.It was found that partial incorporation of CO_(2)+cations into the CeO_(2)lattice resulted in the formation of CeO_(2)-based solid solution,which thus generated oxygen vacancies and consequently the reducibility of the oxygen species on the catalyst and related reaction behaviors.The nature of the CeO_(2)-based solid solution was dependent on the preparation procedure of CeO_(2),and Co_(3)O_(4)supported on the CeO_(2)support prepared using a co-precipitation method(5Co/CeO_(2)-C)gave the best performance(with a T_(90) of 320℃),which was attributed to its high concentration of oxygen vacancies and best low-temperature reducibility.Moreover,the 5Co/CeO_(2)-C catalyst showed good stability in the presence of water vapor in the feed-stream.
作者
张苛锋
许莉莉
黄露璐
李艳明
鲁继青
Zhang Kefeng;Xu Lili;Huang Lulu;Li Yanming;Lu Jiqing(College of Chemistry andMaterials Sciences,Zhejiang Normal University,Jinhua 321004,Zhejiang,China;Library and Information Center of Zhejiang Normal University,Jinhua 321004,Zhejiang,China)
出处
《工业催化》
CAS
2023年第12期34-41,共8页
Industrial Catalysis
基金
国家自然科学基金资助项目(22072137)。
