Abstract
As catalysts for selective oxidation, heteropoly compounds such as 12-molybdophosphoric acid (H 3PMo 12O 40) and its salts have been investigated, in relation to the acidic property, the contribution of bulk acid, the effect of steam in the feed gas, the thermal stability, the effect of countercations, and the oxidation activity and selectivity. It was found that, though the heteropoly compounds are different in several physical characteristics from ordinary mixed metal oxides, the catalytic actions can be understood, to a great extent, from the acid-base properties much as in the case of mixed-oxide catalysts.
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