Ce_(1-x)Fe_xO_2复合氧化物催化剂的制备及其对甲烷的催化燃烧性能

Preparation of Ce_(1-x)Fe_xO_2 mixed oxides by citric acid solgel method for catalytic combustion of methane

采用柠檬酸溶胶-凝胶法和微波技术制备了Ce1-xFexO2复合氧化物,以甲烷催化燃烧为探针反应测定了催化剂的活性及XRD、DRS、BET和TPR进行了表征。结果表明,Ce1-xFexO2复合氧化物为介孔材料,所制得的复合氧化物在x≤0.2时以单一立方萤石结构的Ce1-xFexO2固溶体存在,x>0.2时形成了立方萤石结构Ce1-xFexO2固溶体和少量的CeFeO3混合相。Ce1-xFexO2固溶体的甲烷催化燃烧活性高于单组分CeO2,且随着x的不同而变化,其中以Ce0.9Fe0.1O2固溶体的催化活性最高。

Ce1-x FexO2 mixed oxides of different mole ratios （ x = 0. 1-0. 5 ） were prepared by citric acid sol-gel method and micrewave technique. The activites of Ce1-xFexO2 mixed oxides on methane combustion were investigated, and the structure and reducfive properties were characterized by XRD, BET,DRS and TPR. The data show that Ce1-x Fex O2 mixed oxides prepared are mesoporous materiaL When x ≤0. 2, the transition metal Fe insert into the lattice of CeO2 to form cubic Ce1-x, Fe, O2 solid solutions, when x 〉 0. 2, Ce1-xFexO2 existed in a mixed phases of cubic Ce1-x FexO2 solid solutions and CeFeO3. Ce1-x FexO2 solid solutions show higher activity for methane combustion than pure CeO2, especially for Ce0.9Fe0.1 O2.