The
synthesis and characterization of trimetallic oxides of the
type MCo–Mo (with M = Ni or Zn) in both ϕ
y
- and ϕ
x
-type phases
(depending on the compensation ion) is described. The materials were
calcined at 673 K to obtain mixed oxides with surface areas between
27 and 32 m2 g–1 that were found to be
nonstoichiometric. The catalysts were tested in the oxidative dehydrogenation
of propane at moderate temperature (673 K). It was found that precursors
with a ϕ
y
-type phase provide higher
catalytic performance than those obtained as ϕ
x
-type materials, which could be related to the higher suface
area and better reducibility properties of the former. The influence
of Ni on the catalytic performance was found to be positive in the
two types of structures compared to the undoped CoMo catalysts. On
the other hand, Zn introduction had a negative effect on the intrinsic
reaction rate for both ϕ
y
- and ϕ
x
-derived catalysts. The NiCoMoϕ
y
400 catalyst exhibited the best performance;
thus, further tests were performed with this catalyst at a lower space
velocity, and a higher propene yield was obtained. The NiCoMoϕ
y
400 catalyst exhibited good stability after
being used for 24 h. The yields achieved were around 5%, which is
a good result compared with similar systems described in the literature.
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