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- W2020834705 abstract "The vapor-phase oxidation of methacrolein to methacrylic acid was studied with V2O5P2O5 and V2O5P2O5-based catalysts. The highest selectivity among the V2O5P2O5 catalysts was obtained with a PV atomic ratio from 1.06 to 1.2, while the oxidation activity decreased steadily with an increase in the phosphorus content. The oxidation activity of the PV = 1.06 catalyst was lower than that of such heteropoly-compound catalysts as H3PMO12O40, Cs2HPMo12O40, H5PMo10V240, and Cs2.5H2.5PMo10V2O40. However, the selectivity of the PV = 1.06 was the same as that of the heteropoly-compound catalysts. As for the third components added to the PV = 1.15 oxide, TeO2 was the only oxide which could improve the selectivity. It was also found that the addition of a small amount of H3PMo12O40 and its salts to the PV = 1.15 oxide enhances the oxidation activity to the same level as that of the heteropoly-compound catalysts and, moreover, also improves the selectivity. The highest selectivity was obtained by the addition of Zr34PMo12O40 with an MoV atomic ratio of 0.1. The oxidation rate on the PV = 1.06 catalyst increased almost linearly with the oxygen concentration in the feed gas, while the rate on the heteropoly-compound catalysts was less dependent on the oxygen concentration. In contrast with the heteropoly-compound catalysts, the best performance with the V2O5P2O5 and V2O5P2O5-based catalysts was obtained in the presence of a high oxygen concentration." @default.
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- W2020834705 date "1989-03-01" @default.
- W2020834705 modified "2023-09-27" @default.
- W2020834705 title "Oxidation of methacrolein to methacrylic acid on V2O5$z.sbnd;P2O5-based catalysts" @default.
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- W2020834705 doi "https://doi.org/10.1016/0021-9517(89)90072-9" @default.
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