Abstract
The oxidative coupling of methane was studied on a series of amorphous lanthanum aluminum oxides prepared by the mist decomposition method. The C/sub 2/ activity was increased with increasing aluminum content, showing a maximum at 10 at.%. The C/sub 2/ selectivity of 47% and total methane conversion of 25% was obtained at 983 K on this catalyst. A study on the effect of pretreatment temperature revealed that the active samples were amorphous and that the growth of the crystalline phases decreased greatly the C/sub 2/ activity. The IR study indicated that octahedrally coordinated isolated aluminum ions, which were dispersed into the amorphous lanthanum oxide, constituted the active sites of the reaction. The two kinds of O/sub 2/ adsorption sites were observed in the mixed oxides pretreated at 983 K. The study on the temperature-programmed desorption spectra of a series of catalysts suggested that these sites were responsible for the oxidative coupling of methane.
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