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It has been shown that the phases HxMO3 and MO3−x (M = Mo, W), obtained by reduction of the oxides WO3 and MoO3 with hydrogen with supported Pt(Pd) (0.5 mass %), have higher catalytic activity in the deep oxidation of methane than the catalysts Pt/Al2O3 and Pd/Al2O3 with the same amount of supported metal. At temperatures above 700 K the activity of these catalysts decreases in consequence of the...