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A series of Ce-Fe-Zr-O(x)/MgO(x denotes the mass fraction of Ce-Fe-Zr-O,x=10%,15%,20%,25%,30%) complex oxide oxygen carriers for selective oxidation of methane to synthesis gas were prepared by the co-precipitation method.The catalysts were characterized by means of X-ray diffraction and H2-TPR.The XRD measurements showed that MgFeO4 particles were formed and Fe2O3 particles well dispersed on the oxygen carriers.The reactions between methane diluted by argon(10% CH4) and oxygen carriers were investigated.Suitable content of CeO2/Fe2O3/ZrO2 mixed oxides could promote the reaction between methane and oxygen carriers.There are mainly two kinds of oxygen of carriers:surface lattice oxygen which had higher activity but lower selectivity,and bulk lattice oxygen which had lower activity but higher selectivity.Among all the catalysts,Ce-Fe-Zr-O(20%)/MgO exhibited the best catalytic performance.The conversion of the methane was above 56%,and the selectivity of the H2 and CO were both above 93%,the ratio of H2/CO was stable and approached to 2 for a long time.
A series of Ce-Fe-Zr-O (x) / MgO (x denotes the mass fraction of Ce-Fe-Zr-O, x = 10%, 15%, 20%, 25%, 30% carriers for selective oxidation of methane to synthesis gas were prepared by the co-precipitation method. These metals were characterized by means of X-ray diffraction and H2-TPR. XRD measurements showed that MgFeO4 particles were formed and Fe2O3 particles well dispersed on the oxygen carriers. The reactions between methane diluted by argon (10% CH4) and oxygen carriers were investigated. Available content of CeO2 / Fe2O3 / ZrO2 mixed oxides could promote the reaction between methane and oxygen carriers. There are mainly two kinds of oxygen of carriers : surface lattice oxygen which had higher activity but lower selectivity, and bulk lattice oxygen which had lower activity but higher selectivity. Among all the catalysts, Ce-Fe-Zr-O (20%) / MgO exhibited the best catalytic performance. of the methane was above 56%, and the selectivity of the H2 and CO were both above 93% the ratio of H2 / CO was stable and approached to 2 for a long time.