Fluorine-Modified Mesoporous Ni–Mg–Al Mixed Oxides for Partial Oxidation of Methane

Abstract

Fluorine-modified Ni–Mg–Al mixed oxides prepared by thermal decomposition of hydrtalcite-type (HT) precursor was characterized by XRD, EXAFS, TGA, SEM, TPD-CO2, TPR-H2, N2 adsorption/desorption technique, and then tested in the partial oxidation of methane (POM). The result revealed that fluorine was successfully introduced into Ni–Mg–Al mixed oxide via the high dispersion of MgF2, which led to the formation of the periclase-type catalyst with mesoporous structure. By compared with pure Ni–Mg–Al mixed oxides, they had the low surface area and crystallization with small particle size, but the high moderate and strong basicity. Such catalyst showed a high performance over POM without deactivation even after 120 h run at 1053 K. This could be attributed to the promotion effect of the F− anions, which improved the homogeneous distribution of nickel and basicity of the catalyst with high resistance to coking and sintering. Fluorine-modified Ni–Mg–Al mixed oxides prepared by thermal decomposition of hydrtalcite-type (HT) precursor was characterized by XRD, EXAFS, TGA, SEM, TPD-CO2, TPR-H2, N2 adsorption/desorption technique, and then tested in the partial oxidation of methane (POM). Such catalyst showed a high performance without deactivation even after 120 h run at 1053 K