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Process for the transformation of precursors of mixed vanadium and phosphorus oxide catalysts into active catalysts for the production of maleic anhydride
Process for the transformation of precursors of mixed vanadium and phosphorus oxide catalysts into active catalysts for the production of maleic anhydride
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机译:用于将钒和磷的氧化物混合催化剂的前体转化为用于生产马来酸酐的活性催化剂的方法
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摘要
Vanadium/phosphorus mixed oxide catalysts comprising vanadyl pyrophosphate, optionally containing a promoter component, are transformed from vanadium/phosphorus mixed oxide catalyst precursors comprising vanadyl hydrogen phosphate, optionally containing a promoter component, by subjecting the catalyst precursors to elevated temperatures in three stages -- (a) an initial heat-up stage in an atmosphere selected from the group consisting of air, steam, an inert gas, and mixtures thereof, (b) a rapid heat-up stage at a programmed heat-up rate in a molecular oxygen/steam-containing atmosphere, and (c) a maintenance/finishing stage, first in a molecular oxygen/steam-containing atmosphere, and thereafter in a nonoxidizing, steam-containing atmosphere. Such catalysts are useful for the production of maleic anhydride via the partial oxidation of nonaromatic hydrocarbons, particularly n-butane, in the vapor phase with molecular oxygen or a molecular oxygen-containing gas.
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