We investigated propane ammoxidation to acrylonitrile over hydrothermal Mo-V-Nb-TeO
catalyst containing the dominant M1 phase, recently proposed as active and selective in this
selective ammoxidation reaction. The reaction kinetics was studied in a tubular quartz reactor at
600-700K operated in both differential and integral regimes at 5-60% propane conversion. The
results obtained in this study were examined on the basis of two reaction networks involving
propane transformation via (1) parallel routes to propylene, acrylonitrile and carbon oxides and
(2) propylene as the reaction intermediate for acrylonitrile. The results obtained indicated only a
slight preference for the reaction network involving the propylene intermediate, which may be
explained on the basis of catalytic behavior of the M1 and M2 phases present in the
hydrothermal Mo-V-Nb-Te-O catalyst. The dominant M1 phase was capable of catalyzing all of
the above transformation steps, whereas the M2 impurity phase was only active in propylene
ammoxidation to acrylonitrile. The contribution of the M2 phase to propylene ammoxidation is
expected to be less significant at industrially relevant high propane conversions because of the
improved ability of the M1 phase to covert propylene into acrylonitrile at longer residence times.
The control of catalytic performance of rutile-type Sn/V/Nb/Sb mixed oxides, catalysts for propane ammoxidation to acrylonitrile