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- W1979292149 abstract "V/Ti/O catalysts, active and selective in the ammoxidation of alkylaromatics, were prepared by either neutralization or hydrolysis of titanium (IV)/vanadium(IV) solutions. Neutralization of titanium(IV) chloride solutions at pH lower than 1.1 led to the precipitation of metatitanic acid, which gave rise, by dehydration, to titanium oxide in the rutile form; higher pH led instead to precipitation of the anatase precursor, orthotitanic acid. Similarly, a low hydrolysis temperature led to the rutile precursor, higher temperature to the anastase one. The hydrolysis of vanadium(IV) oxalate-titanium(IV) chloride mixed solutions led to the precipitation of a titanium oxalate hydroxy salt; this gave rise, depending on the hydrolysis temperature, either to the precursor of rutile or of anatase. However, the anatase precursor was obtained in all cases when the mother vanadium(IV) oxalate solution was prepared by using a slight excess of oxalic acid with respect to the stoichiometric requirements for reduction of vanadium pentoxide. Three species of vanadium were identified in calcined catalysts: a vanadium(IV) and a vanadium(V) species, which interacted strongly with the support, and bulk vanadium pentoxide. The relative distribution of the three species was a function of the preparation procedure, rather than of the crystalline structure of titanium oxide." @default.
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- W1979292149 date "1988-04-01" @default.
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- W1979292149 title "Role of the chemistry of solutions of titanium ions in determining the structure of V/Ti/O catalysts" @default.
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- W1979292149 doi "https://doi.org/10.1016/s0166-9834(00)82834-1" @default.
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