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An effective method for increasing the activity of nickel boride catalyst nano-particles in hydrogenation reactions: Low-temperature hydrogen treatment

Paper ID Volume ID Publish Year Pages File Format Full-Text
40413 45852 2013 7 PDF Available
Title
An effective method for increasing the activity of nickel boride catalyst nano-particles in hydrogenation reactions: Low-temperature hydrogen treatment
Abstract

It is shown that low temperature (<100 °C) hydrogen treatment of nano nickel boride catalysts is an efficient process for the enhancement of their activity in the p-nitrophenol (PNP) to p-aminophenol (PAP) hydrogenation reaction. It has been shown that such a process excludes initial borate species present on the surface and within the catalyst nano-particles by promoting their dissolution in the liquid phase. The latter phenomenon is enhanced by increasing the temperature. Treatment in the absence of hydrogen results in no reaction rate enhancement. Instead, the activity falls significantly below that of the as-synthesized catalyst. The effect of hydrogen treatment on the catalyst physical properties was investigated using FTIR, XRD, nitrogen adsorption and FESEM analysis. Mathematical simulation of the PNP hydrogenation reaction rate supports the hypothesis that the rate enhancement is mainly due to the increase of the catalyst specific surface area and partial reduction of surface nickel oxide species. The mechanism by which hydrogen increases the specific surface is discussed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (279 K)Download as PowerPoint slideHighlights► A Ni2B catalyst was treated with H2 at T less than 100 °C in ethanol medium. ► Its performance for a direct hydrogenation reaction was studied. ► The catalytic performance is highly enhanced due to the treatment. ► The effect of temperature and pressure of the treatment has been investigated. ► The mechanism of reactivity enhancement has been elucidated.

Keywords
Nickel boride; Direct hydrogenation; Hydrogen treatment; Catalyst
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An effective method for increasing the activity of nickel boride catalyst nano-particles in hydrogenation reactions: Low-temperature hydrogen treatment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 453, 26 February 2013, Pages 334–340
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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