Pd0.01Ru0.01Ce0.98O2-delta: A highly active and selective catalyst for the liquid phase hydrogenation of p-chloronitrobenzene under ambient conditions
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10.1016/j.molcata.2013.04.018
Inclou dades d'ús des de 2022
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hdl:2117/20879
Tipus de documentArticle
Data publicació2013-09
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Abstract
Nanostructured bimetal ion substituted ceria, Pd0.01Ru0.01Ce0.98O2−ı (PdRuC2), prepared for the first
time by a novel solution combustion synthesis and characterized employing XRD, BET, HRTEM and
XPS has been shown to be very active and selective than the monometal ion substituted analogue
Pd0.02Ce0.98O2−ı (PdC2), whereas Ru0.02Ce0.98O2−ı (RuC2) is inactive towards liquid phase hydrogenation
of p-chloronitrobenzene to p-chloroaniline under ambient conditions. Structural studies show metal
ion substituted ceria as the predominant phase. The hydrogenation over PdRuC2 is completed beyond
75 min with 100% selectivity. Conversely, PdC2 hydrogenates
∼40% of p-chloronitrobenzene with 82%
selectivity. Increase of temperature from 35 ◦C to 80 ◦C showed a little higher activity of PdRuC2 but
with a lower selectivity. The as-prepared and aged forms of PdRuC2 showed similar activity, whereas
PdRuC2 heat-treated at 500 ◦C increased the conversion and the 800 ◦C heated catalyst reduced it (both
∼2%) indicating high thermal stability. Maximum hydrogenation activity has been observed in ethanol
as compared to methanol and butanol. The PdRuC2 catalyst also shows excellent hydrogenation activity
towards o-, m-chloronitrobenzene and nitrobenzene. The enhancement of activity and selectivity of Pd
in presence of Ru in the PdRu bimetal ionic catalyst for the hydrogenation reaction has been attributed
to involvement of remarkable Ru4+-promotion in Pd0.01Ru0.01Ce0.98O2−ı.
CitacióMistri, R. [et al.]. Pd0.01Ru0.01Ce0.98O2-delta: A highly active and selective catalyst for the liquid phase hydrogenation of p-chloronitrobenzene under ambient conditions. "Journal of molecular catalysis A. Chemical", Setembre 2013, vol. 376, p. 111-119.
ISSN1381-1169
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