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Title: Metal Particle Growth During Glucose Hydrogenation over Ru/SiO2 Evaluated by X-ray Absorption Spectroscopy and Electron Microscopy

Abstract

Biorenewable resources such as carbohydrates are considered alternative feedstocks for oxygenated chemicals. This work investigates the stability of silica-supported Ru catalysts in the aqueous phase conversion of glucose to sorbitol. In situ X-ray absorption spectroscopy at the Ru K edge revealed that air-exposed silica-supported Ru was in an oxidized state but was subsequently reduced in aqueous solutions saturated with 40 bar H{sub 2} at 373 K. Furthermore, exposure to aqueous phase conditions resulted in the sintering of Ru particles on the silica surface. However, the presence of glucose in the aqueous phase stabilized the growth of the Ru particles. Batchwise hydrogenation of glucose at 373 K and 80 bar H{sub 2} over a Ru/SiO{sub 2} (2.67 wt %) catalyst is nearly 100% selective to sugar alcohol with an average turnover frequency of 0.21 {+-} 0.04 s{sup -1}. The hydrogenation reaction was not mass transfer limited according to the Madon-Boudart criterion.

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914197
Report Number(s):
BNL-78765-2007-JA
Journal ID: ISSN 1089-5647; JPCBFK; TRN: US200804%%328
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Phys. Chem. B; Journal Volume: 110; Journal Issue: 15
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; RUTHENIUM; CATALYTIC EFFECTS; SILICON OXIDES; CATALYST SUPPORTS; GLUCOSE; HYDROGENATION; STABILITY; CATALYSTS; SORBITOL; SYNTHESIS; national synchrotron light source

Citation Formats

Maris,E., Ketchie, W., Oleshko, V., and Davis, R. Metal Particle Growth During Glucose Hydrogenation over Ru/SiO2 Evaluated by X-ray Absorption Spectroscopy and Electron Microscopy. United States: N. p., 2006. Web. doi:10.1021/jp057022y.
Maris,E., Ketchie, W., Oleshko, V., & Davis, R. Metal Particle Growth During Glucose Hydrogenation over Ru/SiO2 Evaluated by X-ray Absorption Spectroscopy and Electron Microscopy. United States. doi:10.1021/jp057022y.
Maris,E., Ketchie, W., Oleshko, V., and Davis, R. Sun . "Metal Particle Growth During Glucose Hydrogenation over Ru/SiO2 Evaluated by X-ray Absorption Spectroscopy and Electron Microscopy". United States. doi:10.1021/jp057022y.
@article{osti_914197,
title = {Metal Particle Growth During Glucose Hydrogenation over Ru/SiO2 Evaluated by X-ray Absorption Spectroscopy and Electron Microscopy},
author = {Maris,E. and Ketchie, W. and Oleshko, V. and Davis, R.},
abstractNote = {Biorenewable resources such as carbohydrates are considered alternative feedstocks for oxygenated chemicals. This work investigates the stability of silica-supported Ru catalysts in the aqueous phase conversion of glucose to sorbitol. In situ X-ray absorption spectroscopy at the Ru K edge revealed that air-exposed silica-supported Ru was in an oxidized state but was subsequently reduced in aqueous solutions saturated with 40 bar H{sub 2} at 373 K. Furthermore, exposure to aqueous phase conditions resulted in the sintering of Ru particles on the silica surface. However, the presence of glucose in the aqueous phase stabilized the growth of the Ru particles. Batchwise hydrogenation of glucose at 373 K and 80 bar H{sub 2} over a Ru/SiO{sub 2} (2.67 wt %) catalyst is nearly 100% selective to sugar alcohol with an average turnover frequency of 0.21 {+-} 0.04 s{sup -1}. The hydrogenation reaction was not mass transfer limited according to the Madon-Boudart criterion.},
doi = {10.1021/jp057022y},
journal = {J. Phys. Chem. B},
number = 15,
volume = 110,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}