The effect of poly-N-vinylpyrrolidone modification on NiCoB catalysts for hydrogenation of p-chloronitrobenzene

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Title:	The effect of poly-N-vinylpyrrolidone modification on NiCoB catalysts for hydrogenation of p-chloronitrobenzene
Authors:	Zhao,B;Chen,YW
Contributors:	化學工程與材料工程學系
Keywords:	AMORPHOUS ALLOY CATALYST;SELECTIVE HYDROGENATION;PALLADIUM NANOPARTICLES;O-CHLORONITROBENZENE;NANOALLOY CATALYSTS;SIZE CONTROL;AU;CO;NANOCATALYSTS;PERFORMANCE
Date:	2011
Issue Date:	2012-03-27 16:27:55 (UTC+8)
Publisher:	國立中央大學
Abstract:	A series of poly-N-vinylpyrrolidone (PVP)-modified NiCoB catalysts with various PVP contents were prepared by chemical reduction method. The Ni and Co cations were reduced by NaBH(4) at room temperature. PVP was added during preparation. The materials were characterized by X-ray diffraction, transmission electron microscopy, and differential scanning calorimeter. The results showed that all samples possessed amorphous structure. After washing, the residual PVP adsorbed on the surface of NiCoB and acted as a spacer to prevent NiCoB particles from aggregation and agglomeration. The liquid-phase hydrogenation of p-chloronitrobenzene was carried out to investigate the catalytic properties of the PVP-modified NiCoB catalysts. The catalytic activities of NiCoB catalysts decreased by modifying with PVP but the selectivities for p-chloroaniline improved significantly. The competitive adsorption of PVP with p-chloronitrobenzene and p-chloroaniline on the NiCoB nanoparticles was responsible for the catalytic performance. The amount of the PVP played a key role in the hydrogenation reaction. (C) 2010 Elsevier B.V. All rights reserved.
Relation:	MATERIALS CHEMISTRY AND PHYSICS
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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