INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Intrinsic kinetic modeling with explicit radiation absorption effects of the photocatalytic oxidation of cyanide with TiO2 and silica-supported TiO2 suspensions
Autor/es:
MARUGAN, J.; VAN GRIEKEN, R; CASSANO, A.E.; ALFANO, O.M.
Revista:
APPLIED CATALYSIS B-ENVIRONMENTAL
Editorial:
Elsevier
Referencias:
Año: 2008 vol. 85 p. 48 - 60
ISSN:
0926-3373
Resumen:
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This study
is focused on the kineticmodeling of the photocatalytic oxidation of cyanide in
slurry reactors. The developed model is based on an accepted reaction mechanism
and explicitly takes into account the differences in the local volumetric rate
of photon absorption (LVRPA) produced by the unavoidable radiation profiles
existing in the photoreactor. The model and its correspondent procedures for
the evaluation of the LVRPA distribution, and the estimation of the kinetic
parameters have been successfully validated with both powder TiO2
and TiO2/SiO2 photocatalysts with improved recovery
properties. In both cases, the model reproduces the influence of the catalyst
loading, the initial cyanide concentration, and the inlet radiation flux on the
reaction rate, with errors below 5%. The kinetic parameters estimated for the
model are independent of the irradiation form, as well as the reactor size and
its geometrical configuration, providing the necessary information for
scaling-up and designing commercial
scale photoreactors.