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Metal-ion exchanged heteropoly acids of the general formula M[W12PO40](M = a group VIII metal) supported on SiO2 have been found to be excellent catalysts for the vapour phase carbonylation of methanol or dimethyl ether to methyl acetate at 225 °C and 1 atm total operating pressure.
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Richard W. Wegman (1994) studied this question.
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