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Selective gas phase hydrogenation of p-nitrobenzonitrile to p-aminobenzonitrile over zirconia supported gold

Paper ID Volume ID Publish Year Pages File Format Full-Text
39026 45801 2016 9 PDF Available
Title
Selective gas phase hydrogenation of p-nitrobenzonitrile to p-aminobenzonitrile over zirconia supported gold
Abstract

•First report of p-nitrobenzonitrile gas phase hydrogenation over supported Au.•100% yield of p-aminobenzonitrile over Au/ZrO2 and Au/Al2O3.•Au/ZrO2 outperforms Au/Al2O3, Pd/Al2O3 and Ni/Al2O3.•Tetragonal → monoclinic ZrO2 on introduction of Au by deposition–precipitation.

The catalytic action of Au/ZrO2 in the gas phase hydrogenation of p-nitrobenzonitrile (p-NBN) to p-aminobenzonitrile (p-ABN) has been assessed against Au/Al2O3. Crystalline ZrO2 was prepared by precipitation of ZrOCl2 with aqueous NH3 and calcined to generate tetragonal and monoclinic phases. Catalyst and support were characterised by surface area/porosity, temperature-programmed reduction (TPR), H2 chemisorption/temperature programmed desorption (TPD), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) measurements. Higher calcination temperatures (673–973 K) increased the monoclinic ZrO2 content with a decrease in surface area and pore volume. Introduction of Au by deposition–precipitation resulted in tetragonal → monoclinic transformation with post-TPR formation of Au particles in the 3–13 nm size range and electron transfer from ZrO2. Reaction over Au/ZrO2 delivered 100% p-ABN yield with higher turnover frequency (267 h−1) than Au/Al2O3 (109 h−1) attributed to greater H2 chemisorption capacity under reaction conditions and enhanced −NO2 activation. Au/ZrO2 outperformed benchmark Pd/Al2O3 and Ni/Al2O3, which generated p-aminotoluene via subsequent hydrogenation/hydrogenolysis.

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Keywords
Selective hydrogenation; Au/ZrO2; Au/Al2O3; p-Nitrobenzonitrile; p-Aminobenzonitrile
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Selective gas phase hydrogenation of p-nitrobenzonitrile to p-aminobenzonitrile over zirconia supported gold
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 510, 25 January 2016, Pages 171–179
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
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Full-text PDF Download
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Any Questions? feel free to contact us