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Ni-Silicides nanoparticles as substitute for noble metals for hydrogenation of nitrobenzene to p-Aminophenol in sulfuric acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
38929 45797 2016 6 PDF Available
Title
Ni-Silicides nanoparticles as substitute for noble metals for hydrogenation of nitrobenzene to p-Aminophenol in sulfuric acid
Abstract

•NiSi2 nanoparticles are active and selective for hydrogenation.•Ni-silicides nanoparticles exhibit excellent acid-resistance.•Ni-silicides nanoparticles are suggested as substitute for noble metals.

The hydrogenation of nitrobenzene (NB) in acid medium is regarded as the most promising route to prepare p-aminophenol (PAP). The noble metals such as Pt have been reported as commercial catalysts but base metals are inactive due to strong acids needed in the reaction medium. Therefore, Ni-based catalyst has been attempted using solid acids, however, the results are not attractive. In this work, in order to improve the acid-resistance of Ni in sulfuric acid, we insert Si into the Ni crystal structure to form Ni-silicides. The as-prepared supported Ni-silicides nanoparticles exhibit excellent acid-resistance and perform high activity and selectivity of the entitled reaction. NiSi2 nanoparticles supported on acid-treated active carbon are highly active and selective to convert NB to PAP in sulfuric acid. The XPS measurements show that the Ni in the Ni-silicides donates electrons to silicon, but the Ni valence is still far lower than nickel oxide, which causes its stability in acids and the activity to hydrogen activation is partially reserved. Thus, the catalysts exhibit excellent stability in alloy structure, morphology, and catalytic performance in reuses, suggesting the Ni-silicides nanoparticles as the promising substitute for precious metal for PAP manufactures.

Graphical abstractSeries supported Ni-silicides was prepared and used as catalyst for the hydrogenation of nitrobenzene (NB) to prepare p-aminophenol (PAP) in sulfuric acid. The Ni-silicides nanoparticles exhibit excellent acid-resistance and performances like noble metal. NiSi2 nanoparticles supported on acid-treated active carbon exhibit excellent stability in alloy structure, morphology, and catalytic performance in reuses, suggesting the Ni-silicides nanoparticles as the promising substitute for precious metal for PAP manufactures.Figure optionsDownload full-size imageDownload high-quality image (144 K)Download as PowerPoint slide

Keywords
Ni-silicides nanoparticles; High selectivity; Acid-resistance; Hydrogenation; p-aminophenol
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Ni-Silicides nanoparticles as substitute for noble metals for hydrogenation of nitrobenzene to p-Aminophenol in sulfuric acid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 520, 25 June 2016, Pages 151–156
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us