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• W127925311 abstract "The Mo/SiO2 catalysts (1–15 wt.-% Mo), prepared by impregnation of aerosil silica with ammonium heptamolybdate, were characterized by physical techniques and tested in methane oxidation using nitrous oxide and oxygen as the oxidizing agents. Characterization by X-ray photoelectron spectroscopy (XPS), laser Raman spectroscopy, surface potential techniques and acidimetric titration resulted in three ranges of molybdenum loading being distinguished in which the nature of the Mo species and the mode of its distribution were different. The present data principally confirmed the results previously reported in the literature on the nature of Mo species dispersed on silica, but in addition they demonstrated the mode of distribution of different forms of molybdenum. For a Mo content between 1 and 5 wt.-% Mo, silicomolybdic acid (SMA) which covered the silica uniformly, was the main Mo species. At Mo loadings between 5 and 10 wt.-% the presence of polymolybate species on top of the SMA layer was observed, the coverage of the silica surface being constant. At still higher Mo loading the amount of SMA decreased to zero (at 15 wt.-% Mo) and crystalline MoO3 appeared, covering the surface of both silica and the polymolybdates. The oxidation of methane by nitrous oxide on samples in the first range yielded formaldehyde as a partial oxidation product, carbon monoxide being the other principal product. The yield and selectivity to formaldehyde increased with the amount of SMA in the catalysts. At higher Mo content total oxidation was the predominant reaction, although small amounts of C2 products of the methane oxidative coupling were also observed. In the presence of oxygen as the oxidizing agent methane conversion was higher, the main reaction in the whole range of the Mo content being total oxidation." @default.
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• W127925311 date "1988-11-01" @default.
• W127925311 modified "2023-10-03" @default.
• W127925311 title "Silica supported molybdena catalysts" @default.
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• W127925311 doi "https://doi.org/10.1016/s0166-9834(00)80048-2" @default.
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