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|Section2= |Section3= |Section7= |Section8= }} Silicotungstic acid (also known as tungstosilicic acid) is the most commonly encountered heteropoly acid. It is a pale yellow solid with the chemical formula H4(). It is used as a catalyst in the chemical industry. ==Applications== Silicotungstic acid is used to manufacture ethyl acetate by the alkylation of acetic acid by ethylene: :C2H4 + CH3CO2H → CH3CO2C2H5 It has also been commercialized for the oxidation of ethylene to acetic acid:〔 :C2H4 + O2 → CH3CO2H This route is claimed as a "greener" than methanol carbonylation. The heteropoly acid is dispersed on silica gel at 20-30 wt% to maximize catalytic ability. It has also recently been proposed as a mediator in production of hydrogen through electrolysis of water by a process that would reduce the danger of explosion while allowing efficient hydrogen production at low current densities, conducive to hydrogen production using renewable energy. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「silicotungstic acid」の詳細全文を読む スポンサード リンク
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