TY - JOUR
T1 - Ultra-selective gas phase catalytic hydrogenation of aromatic nitro compounds over Au/Al2O3
AU - Cardenas-Lizana, Fernando
AU - Gómez-Quero, Santiago
AU - Keane, Mark A.
PY - 2008/3/1
Y1 - 2008/3/1
N2 - We report, for the first time, the exclusive (and time invariant) gas phase hydrogenation of p-chloronitrobenzene to p-chloroaniline over Au/Al2O3 where 393 K = T = 523 K (?Ea = 49 kJ mol-1). Under the same conditions, Pd/Al2O3 promoted the formation of nitrobenzene and aniline, i.e. composite hydrodechlorination and hydrogenation. Reaction over Au-Pd/Al2O3 delivered equivalent activity/selectivity to that obtained with Pd/Al2O3. Temperature programmed reduction analysis and hydrogen uptake measurements suggest there is negligible Au-Pd interaction in the bimetallic. Exclusive formation of the corresponding haloaniline is also demonstrated over Au/Al2O3 for a series of mono- and di-substituted halonitroarenes; the activity sequence is consistent with electron withdrawing substituent activation. © 2007 Elsevier B.V. All rights reserved.
AB - We report, for the first time, the exclusive (and time invariant) gas phase hydrogenation of p-chloronitrobenzene to p-chloroaniline over Au/Al2O3 where 393 K = T = 523 K (?Ea = 49 kJ mol-1). Under the same conditions, Pd/Al2O3 promoted the formation of nitrobenzene and aniline, i.e. composite hydrodechlorination and hydrogenation. Reaction over Au-Pd/Al2O3 delivered equivalent activity/selectivity to that obtained with Pd/Al2O3. Temperature programmed reduction analysis and hydrogen uptake measurements suggest there is negligible Au-Pd interaction in the bimetallic. Exclusive formation of the corresponding haloaniline is also demonstrated over Au/Al2O3 for a series of mono- and di-substituted halonitroarenes; the activity sequence is consistent with electron withdrawing substituent activation. © 2007 Elsevier B.V. All rights reserved.
KW - Au-Pd/Al 2 O 3
KW - Au/Al 2 O 3
KW - Halonitroarene
KW - Selective hydrogenation
UR - http://www.scopus.com/inward/record.url?scp=36549068780&partnerID=8YFLogxK
U2 - 10.1016/j.catcom.2007.07.032
DO - 10.1016/j.catcom.2007.07.032
M3 - Article
SN - 1566-7367
VL - 9
SP - 475
EP - 481
JO - Catalysis Communications
JF - Catalysis Communications
IS - 3
ER -