Preparation of mesoporous Ce1-xFexO2 mixed oxides and their catalytic properties in methane combustion

Mesoporous Ce1-x Fe (x) O-2 mixed oxide catalysts of different molar ratios (x = 0.1-0.5) were prepared by the citric acid sol-gel method and the microwave technique. The activities of Ce1 - x Fe (x) O-2 mixed oxides on methane combustion were investigated, and the structure and reductive properties were characterized by XRD, BET, DRS, and TPR. The data showed that Ce1 - x Fe (x) O-2 mixed oxides prepared were mesoporous material. When x similar to 0.2, the transition metal Fe incorporated into the lattice of CeO2 to form cubic Ce1 - x Fe (x) O-2 solid solutions, and mixed phases of cubic Ce1 - x Fe (x) O-2 solid solutions and alpha-Fe2O3 existed when x > 0.2. Ce1 - x Fe (x) O-2 solid solutions show higher activity for methane combustion than pure CeO2, especially for Ce0.9Fe0.1O2.