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Different metal oxides have been impregnated by sulfur S 8 and treated under H 2 O at increasing temperature up to 330 o C. In case of TiO 2 and Al 2 O 3 , H 2 S and SO 2 emissions have been detected by gas chromatography, showing that the reverse Claus reaction between sulfur and water occurs. Addition of sulfate ions to TiO 2 ...
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