A. Wickman, A. Andersson / Applied Catalysis A: General 391 (2011) 110–117
117
composition as obtained by XPS for the pure ≈SbVO4 without
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phase show stable catalytic performance with time and consists of
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been demonstrated that the rutile type structure is stable under
ammoxidation conditions [40,41]. The latter fact, however, does
not exclude that the steady-state composition of the rutile can be
slightly reduced, preserving the rutile type structure as previously
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5+
3+
In rutile type Sb0.9
V
0.3
V
0.6
4+O4 substitution of V with Fe,
Ga and Ti is possible. The predominant substitution mechanisms
are Fe3+ ↔ V3+, Ga3+ ↔ V3+, Ti4+ ↔ V4+ and 2Ti4+ ↔ V3+ + Sb5+. More-
over, some of the Sb5+ can be replaced with Nb5+
.
Replacement of V by Fe and Ga gives a catalyst that compared to
the ≈SbVO4 base composition is considerably less active per surface
area unit and more selective to acrylonitrile formation at compara-
ble propane conversion. Substitution of V with Ti causes similar
effects, although for comparable substitution levels, the activity
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A comparison of the catalytic data for the substituted catalysts
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