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CeO2-Nb2O5 mixed oxide catalysts: Preparation, characterization and catalytic activity in fructose dehydration reaction

Authorized Users Only
2012
Authors
Stošić, Dušan
Bennici, Simona
Rakić, Vesna
Auroux, Aline
Conference object (Published version)
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Abstract
In this work, ceria-niobia mixed oxides have been prepared by coprecipitation. The structural, textural, and surface properties of these materials have been fully characterized using appropriate techniques (low-temperature adsorption-desorption of nitrogen, thermogravimetric analysis, X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and temperature-programmed reduction/oxidation (TPR/O)). The acid-base properties were estimated by the adsorption of appropriate probe molecules - NH3 or SO2 were used to estimate the population, strength and strength distribution of acid or basic sites, by means of adsorption microcalorimetry. The nature of acidic sites was determined through the adsorption/desorption of pyridine, studied by infrared spectroscopy. New phases between the oxides were not formed, while there is evidence of interaction between them, as revealed by XRD and Raman spectroscopy. All investigated mixed oxide samples are amphoteric and po...ssess red-ox centers on their surface. Both red-ox and acid-base properties are dependent on the ratio of ceria to niobia in the samples. Both Lewis and Brnsted acid sites are present on the surface of the mixed oxides. In order to check catalytic abilities of these materials, reaction of fructose dehydration has been performed. All the investigated materials are catalytically active in fructose dehydration; conversion of fructose and selectivity to 5-hydroxymethylfurfural (5-HMF) improved with increasing content of niobia in the samples.

Keywords:
Ceria-niobia mixed oxide catalysts / Acid/base properties / Adsorption calorimetry / Fructose dehydration / 5-Hydroxymethylfurfural
Source:
Catalysis Today, 2012, 192, 1, 160-168
Publisher:
  • Elsevier Science Bv, Amsterdam
Funding / projects:
  • French National Research AgencyFrench National Research Agency (ANR) [ANR-09-CP2D-19]

DOI: 10.1016/j.cattod.2011.10.040

ISSN: 0920-5861

WoS: 000308675600025

Scopus: 2-s2.0-84866073921
[ Google Scholar ]
61
54
URI
http://aspace.agrif.bg.ac.rs/handle/123456789/2987
Collections
  • Radovi istraživača / Researchers’ publications
Institution/Community
Poljoprivredni fakultet
TY  - CONF
AU  - Stošić, Dušan
AU  - Bennici, Simona
AU  - Rakić, Vesna
AU  - Auroux, Aline
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2987
AB  - In this work, ceria-niobia mixed oxides have been prepared by coprecipitation. The structural, textural, and surface properties of these materials have been fully characterized using appropriate techniques (low-temperature adsorption-desorption of nitrogen, thermogravimetric analysis, X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and temperature-programmed reduction/oxidation (TPR/O)). The acid-base properties were estimated by the adsorption of appropriate probe molecules - NH3 or SO2 were used to estimate the population, strength and strength distribution of acid or basic sites, by means of adsorption microcalorimetry. The nature of acidic sites was determined through the adsorption/desorption of pyridine, studied by infrared spectroscopy. New phases between the oxides were not formed, while there is evidence of interaction between them, as revealed by XRD and Raman spectroscopy. All investigated mixed oxide samples are amphoteric and possess red-ox centers on their surface. Both red-ox and acid-base properties are dependent on the ratio of ceria to niobia in the samples. Both Lewis and Brnsted acid sites are present on the surface of the mixed oxides. In order to check catalytic abilities of these materials, reaction of fructose dehydration has been performed. All the investigated materials are catalytically active in fructose dehydration; conversion of fructose and selectivity to 5-hydroxymethylfurfural (5-HMF) improved with increasing content of niobia in the samples.
PB  - Elsevier Science Bv, Amsterdam
C3  - Catalysis Today
T1  - CeO2-Nb2O5 mixed oxide catalysts: Preparation, characterization and catalytic activity in fructose dehydration reaction
EP  - 168
IS  - 1
SP  - 160
VL  - 192
DO  - 10.1016/j.cattod.2011.10.040
UR  - conv_4970
ER  - 
@conference{
author = "Stošić, Dušan and Bennici, Simona and Rakić, Vesna and Auroux, Aline",
year = "2012",
abstract = "In this work, ceria-niobia mixed oxides have been prepared by coprecipitation. The structural, textural, and surface properties of these materials have been fully characterized using appropriate techniques (low-temperature adsorption-desorption of nitrogen, thermogravimetric analysis, X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and temperature-programmed reduction/oxidation (TPR/O)). The acid-base properties were estimated by the adsorption of appropriate probe molecules - NH3 or SO2 were used to estimate the population, strength and strength distribution of acid or basic sites, by means of adsorption microcalorimetry. The nature of acidic sites was determined through the adsorption/desorption of pyridine, studied by infrared spectroscopy. New phases between the oxides were not formed, while there is evidence of interaction between them, as revealed by XRD and Raman spectroscopy. All investigated mixed oxide samples are amphoteric and possess red-ox centers on their surface. Both red-ox and acid-base properties are dependent on the ratio of ceria to niobia in the samples. Both Lewis and Brnsted acid sites are present on the surface of the mixed oxides. In order to check catalytic abilities of these materials, reaction of fructose dehydration has been performed. All the investigated materials are catalytically active in fructose dehydration; conversion of fructose and selectivity to 5-hydroxymethylfurfural (5-HMF) improved with increasing content of niobia in the samples.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Catalysis Today",
title = "CeO2-Nb2O5 mixed oxide catalysts: Preparation, characterization and catalytic activity in fructose dehydration reaction",
pages = "168-160",
number = "1",
volume = "192",
doi = "10.1016/j.cattod.2011.10.040",
url = "conv_4970"
}
Stošić, D., Bennici, S., Rakić, V.,& Auroux, A.. (2012). CeO2-Nb2O5 mixed oxide catalysts: Preparation, characterization and catalytic activity in fructose dehydration reaction. in Catalysis Today
Elsevier Science Bv, Amsterdam., 192(1), 160-168.
https://doi.org/10.1016/j.cattod.2011.10.040
conv_4970
Stošić D, Bennici S, Rakić V, Auroux A. CeO2-Nb2O5 mixed oxide catalysts: Preparation, characterization and catalytic activity in fructose dehydration reaction. in Catalysis Today. 2012;192(1):160-168.
doi:10.1016/j.cattod.2011.10.040
conv_4970 .
Stošić, Dušan, Bennici, Simona, Rakić, Vesna, Auroux, Aline, "CeO2-Nb2O5 mixed oxide catalysts: Preparation, characterization and catalytic activity in fructose dehydration reaction" in Catalysis Today, 192, no. 1 (2012):160-168,
https://doi.org/10.1016/j.cattod.2011.10.040 .,
conv_4970 .

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