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Abstract
Gas-phase oxidation of methacrolein to methacrylic acid has been carried out over various unsupported and supported H4PMo11VO40 catalysts. While SiO2-supported H4PMo11VO40showed low selectivity to methacrylic acid, H4PMo11VO40 supported on NH3-modified SiO2, which was prepared by using an impregnation method with acetone as the solvent, exhibited high selectivity (~ 90%) and high activity for the formation of methacrylic acid. The activity of H4PMo11VO40/NH3-modified SiO2was more than five times higher than that of the corresponding unsupported catalysts.
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