Journal of the Chemical Society - Faraday Transactions p. 4257 - 4263 (1996)
Update date:2022-08-17
Topics:
Brueckner, Angelika
Martin, Andreas
Steinfeldt, Norbert
Wolf, Gert-Ulrich
Luecke, Bernhard
(VO)2P2O7, differently prepared (NH4)2(VO)3(P2O7) 2 samples and supported amorphous vanadium phosphorus oxide (VPO) catalysts were investigated during the ammoxidation of toluene using a self-constructed in situ EPR flow reactor in the X-band. For the unsupported catalysts, changes in the spin-spin exchange behaviour were analysed by calculating the quotient of the 4th and the square of the 2nd moment, 〈B4〉/〈B2〉2, of the absorption signal. The catalytic activity was found to increase with exchange efficiency, while isolated vanadyl centres, as present in the supported catalysts, do not obviously participate in the catalytic process. NH4+ containing catalysts can easily supply ammonia for N insertion into the hydrocarbon indicating that the latter does not react directly with NH3 molecules from the gas phase but with those activated by adsorption on the surface of the catalyst according to a Langmuir-Hinshelwood mechanism.
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