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- W11544487 abstract "Abstract The catalytic oxidation properties of HY, HZSM5 and HZSM11 zeolites modified by vanadium–phosphorus oxide or vanadium–oxide deposition and of catalysts obtained from V–silicalite precursors are analyzed in the selective conversion of butadiene to furan and maleic anhydride and para–and meta–xylene ammoxidation, and pure ZSM5 zeolites with different Si/Al ratios are tested in the propane conversion to aromatics in the presence of O 2 . In the HY and HZSM5 zeolites the deposited PV clusters interact with protondonor centers giving rise to an inhibition of the maleic anhydride formation from butadiene. This effect is not present in the HZSM11 zeolite. An analogous change in the catalytic behavior is found for the ammoxidation of xylenes. The insertion of V in the framework of silicalite leads to, after activation, the formation of selective sites for furan synthesis from butadiene. Selectivity increases with Si/V atomic ratio. The presence of oxygen in the feed increases the formation of aromatics from propane on the pure zeolites. The oxygen effect is a function of the concentration of OH sites and is attributed to the formation of radical–like surface sites." @default.
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- W11544487 date "1989-01-01" @default.
- W11544487 modified "2023-10-16" @default.
- W11544487 title "Catalytic Properties of Zeolites in Oxidation and Ammoxidation Reaction" @default.
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- W11544487 doi "https://doi.org/10.1016/s0167-2991(09)61300-8" @default.
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