Selectivity in the gas-phase hydrogenation of 4-nitrobenzaldehyde over supported Au catalysts

Noemie Perret; Xiaodong Wang; Thomas Onfroy; Christophe Calers; Mark A Keane

doi:10.1016/j.jcat.2013.10.011

Selectivity in the gas-phase hydrogenation of 4-nitrobenzaldehyde over supported Au catalysts

Noemie Perret, Xiaodong Wang, Thomas Onfroy, Christophe Calers, Mark A Keane

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

The effects of Au particle size and support properties have been examined in the gas-phase hydrogenation of 4-nitrobenzaldehyde over Au/ZrO2, Au/TiO2 and Au/Al2O3. Gold particle size was varied using deposition-precipitation and impregnation syntheses. The catalysts have been characterised in terms of BET area/pore volume, temperature-programmed reduction (TPR), XRD, H-2 chemisorption/TPD, TEM, XPS, and pyridine adsorption FOR measurements. Reaction exclusivity to 4-aminobenzaldehyde was achieved over Au/ZrO2 and Au/TiO2 where a decrease in Au particle size (mean from 7.0 to 4.7 nm) generated a higher turnover frequency. Pyridine adsorption coupled with FTIR analysis has revealed stronger Lewis acidity associated with Au/Al2O3, which contributes to C=O reduction via the formation of a benzoate intermediate. Selectivity to the alcohol is sensitive to Au size and reaction temperature with 100% 4-nitrobenzyl alcohol selectivity over Au/Al2O3 (mean Au size = 7.8 nm) at 423-443 K. Our results demonstrate the viability of controlling selective -NO2 and C=O reduction using oxide-supported Au catalysts. (C) 2013 Elsevier Inc. All rights reserved.

Original language	English
Pages (from-to)	333-342
Number of pages	10
Journal	Journal of Catalysis
Volume	309
DOIs	https://doi.org/10.1016/j.jcat.2013.10.011
Publication status	Published - Jan 2014

Keywords

Supported Au catalysts
Selective hydrogenation
4-Nitrobenzaldehyde
Lewis acidity
Au particle size effects
AROMATIC NITRO-COMPOUNDS
GOLD CATALYSTS
CHEMOSELECTIVE HYDROGENATION
ACTIVE-SITES
CROTONALDEHYDE HYDROGENATION
SUBSTITUTED NITROAROMATICS
UNSATURATED ALCOHOLS
CARBONYL-COMPOUNDS
AU/ZRO2 CATALYSTS
REAL STRUCTURE

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10.1016/j.jcat.2013.10.011

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title = "Selectivity in the gas-phase hydrogenation of 4-nitrobenzaldehyde over supported Au catalysts",

abstract = "The effects of Au particle size and support properties have been examined in the gas-phase hydrogenation of 4-nitrobenzaldehyde over Au/ZrO2, Au/TiO2 and Au/Al2O3. Gold particle size was varied using deposition-precipitation and impregnation syntheses. The catalysts have been characterised in terms of BET area/pore volume, temperature-programmed reduction (TPR), XRD, H-2 chemisorption/TPD, TEM, XPS, and pyridine adsorption FOR measurements. Reaction exclusivity to 4-aminobenzaldehyde was achieved over Au/ZrO2 and Au/TiO2 where a decrease in Au particle size (mean from 7.0 to 4.7 nm) generated a higher turnover frequency. Pyridine adsorption coupled with FTIR analysis has revealed stronger Lewis acidity associated with Au/Al2O3, which contributes to C=O reduction via the formation of a benzoate intermediate. Selectivity to the alcohol is sensitive to Au size and reaction temperature with 100% 4-nitrobenzyl alcohol selectivity over Au/Al2O3 (mean Au size = 7.8 nm) at 423-443 K. Our results demonstrate the viability of controlling selective -NO2 and C=O reduction using oxide-supported Au catalysts. (C) 2013 Elsevier Inc. All rights reserved.",

keywords = "Supported Au catalysts, Selective hydrogenation, 4-Nitrobenzaldehyde, Lewis acidity, Au particle size effects, AROMATIC NITRO-COMPOUNDS, GOLD CATALYSTS, CHEMOSELECTIVE HYDROGENATION, ACTIVE-SITES, CROTONALDEHYDE HYDROGENATION, SUBSTITUTED NITROAROMATICS, UNSATURATED ALCOHOLS, CARBONYL-COMPOUNDS, AU/ZRO2 CATALYSTS, REAL STRUCTURE",

author = "Noemie Perret and Xiaodong Wang and Thomas Onfroy and Christophe Calers and Keane, {Mark A}",

year = "2014",

month = jan,

doi = "10.1016/j.jcat.2013.10.011",

language = "English",

volume = "309",

pages = "333--342",

journal = "Journal of Catalysis",

issn = "0021-9517",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Selectivity in the gas-phase hydrogenation of 4-nitrobenzaldehyde over supported Au catalysts

AU - Perret, Noemie

AU - Wang, Xiaodong

AU - Onfroy, Thomas

AU - Calers, Christophe

AU - Keane, Mark A

PY - 2014/1

Y1 - 2014/1

N2 - The effects of Au particle size and support properties have been examined in the gas-phase hydrogenation of 4-nitrobenzaldehyde over Au/ZrO2, Au/TiO2 and Au/Al2O3. Gold particle size was varied using deposition-precipitation and impregnation syntheses. The catalysts have been characterised in terms of BET area/pore volume, temperature-programmed reduction (TPR), XRD, H-2 chemisorption/TPD, TEM, XPS, and pyridine adsorption FOR measurements. Reaction exclusivity to 4-aminobenzaldehyde was achieved over Au/ZrO2 and Au/TiO2 where a decrease in Au particle size (mean from 7.0 to 4.7 nm) generated a higher turnover frequency. Pyridine adsorption coupled with FTIR analysis has revealed stronger Lewis acidity associated with Au/Al2O3, which contributes to C=O reduction via the formation of a benzoate intermediate. Selectivity to the alcohol is sensitive to Au size and reaction temperature with 100% 4-nitrobenzyl alcohol selectivity over Au/Al2O3 (mean Au size = 7.8 nm) at 423-443 K. Our results demonstrate the viability of controlling selective -NO2 and C=O reduction using oxide-supported Au catalysts. (C) 2013 Elsevier Inc. All rights reserved.

AB - The effects of Au particle size and support properties have been examined in the gas-phase hydrogenation of 4-nitrobenzaldehyde over Au/ZrO2, Au/TiO2 and Au/Al2O3. Gold particle size was varied using deposition-precipitation and impregnation syntheses. The catalysts have been characterised in terms of BET area/pore volume, temperature-programmed reduction (TPR), XRD, H-2 chemisorption/TPD, TEM, XPS, and pyridine adsorption FOR measurements. Reaction exclusivity to 4-aminobenzaldehyde was achieved over Au/ZrO2 and Au/TiO2 where a decrease in Au particle size (mean from 7.0 to 4.7 nm) generated a higher turnover frequency. Pyridine adsorption coupled with FTIR analysis has revealed stronger Lewis acidity associated with Au/Al2O3, which contributes to C=O reduction via the formation of a benzoate intermediate. Selectivity to the alcohol is sensitive to Au size and reaction temperature with 100% 4-nitrobenzyl alcohol selectivity over Au/Al2O3 (mean Au size = 7.8 nm) at 423-443 K. Our results demonstrate the viability of controlling selective -NO2 and C=O reduction using oxide-supported Au catalysts. (C) 2013 Elsevier Inc. All rights reserved.

KW - Supported Au catalysts

KW - Selective hydrogenation

KW - 4-Nitrobenzaldehyde

KW - Lewis acidity

KW - Au particle size effects

KW - AROMATIC NITRO-COMPOUNDS

KW - GOLD CATALYSTS

KW - CHEMOSELECTIVE HYDROGENATION

KW - ACTIVE-SITES

KW - CROTONALDEHYDE HYDROGENATION

KW - SUBSTITUTED NITROAROMATICS

KW - UNSATURATED ALCOHOLS

KW - CARBONYL-COMPOUNDS

KW - AU/ZRO2 CATALYSTS

KW - REAL STRUCTURE

U2 - 10.1016/j.jcat.2013.10.011

DO - 10.1016/j.jcat.2013.10.011

M3 - Article

SN - 0021-9517

VL - 309

SP - 333

EP - 342

JO - Journal of Catalysis

JF - Journal of Catalysis

ER -

Selectivity in the gas-phase hydrogenation of 4-nitrobenzaldehyde over supported Au catalysts

Abstract

Keywords

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