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Gas-phase dehydration of glycerol to acrolein over Al2O3-, SiO2- and TiO2-supported Nb- and W-oxide catalysts

Massa, Mariano LU ; Andersson, Arne LU ; Finocchio, Elisabetta and Busca, Guido (2013) In Journal of Catalysis 307. p.170-184
Abstract
Hypothetical monolayers loadings of niobium and tungsten oxide supported on alumina, silica and titania were investigated as catalysts for the dehydration of glycerol to produce acrolein. Besides activity measurements, to have information about the supported structures the catalysts were characterized by XRD, Raman spectroscopy, XPS, XANES and FTIR combined with adsorption of pyridine and CO2. Compared with silica showing the presence of crystalline Nb2O5 and WO3, alumina and titania gave better dispersion and formation of hydrated niobate and tungstate species. Deactivation of the catalysts occurred with time on stream. However, the stability was improved considerably by adding oxygen to the feed. A dependence of the selectivity to... (More)
Hypothetical monolayers loadings of niobium and tungsten oxide supported on alumina, silica and titania were investigated as catalysts for the dehydration of glycerol to produce acrolein. Besides activity measurements, to have information about the supported structures the catalysts were characterized by XRD, Raman spectroscopy, XPS, XANES and FTIR combined with adsorption of pyridine and CO2. Compared with silica showing the presence of crystalline Nb2O5 and WO3, alumina and titania gave better dispersion and formation of hydrated niobate and tungstate species. Deactivation of the catalysts occurred with time on stream. However, the stability was improved considerably by adding oxygen to the feed. A dependence of the selectivity to acrolein on the Brønsted acidity of the catalyst was observed. Under anaerobic conditions an alumina-supported mixed Nb-W-oxide catalyst gave a selectivity of more than 70% for glycerol conversions above 40%. Even better selectivity was obtained using a catalyst with tungsten oxide supported on titania, which gave 80% selectivity under aerobic conditions at high conversion. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Glycerol, Dehydration, Acrolein, Supported niobia, Supported tungsten oxide, Supported Nb-W-oxide, Al2O3, TiO2, SiO2, acidity
in
Journal of Catalysis
volume
307
pages
170 - 184
publisher
Elsevier
external identifiers
  • wos:000327903900020
  • scopus:84883170313
ISSN
1090-2694
DOI
10.1016/j.jcat.2013.07.022
language
English
LU publication?
yes
id
fcf18cf8-e1ae-4364-948b-60b007ff2114 (old id 4001612)
date added to LUP
2016-04-01 10:24:06
date last changed
2023-12-08 17:46:09
@article{fcf18cf8-e1ae-4364-948b-60b007ff2114,
  abstract     = {{Hypothetical monolayers loadings of niobium and tungsten oxide supported on alumina, silica and titania were investigated as catalysts for the dehydration of glycerol to produce acrolein. Besides activity measurements, to have information about the supported structures the catalysts were characterized by XRD, Raman spectroscopy, XPS, XANES and FTIR combined with adsorption of pyridine and CO2. Compared with silica showing the presence of crystalline Nb2O5 and WO3, alumina and titania gave better dispersion and formation of hydrated niobate and tungstate species. Deactivation of the catalysts occurred with time on stream. However, the stability was improved considerably by adding oxygen to the feed. A dependence of the selectivity to acrolein on the Brønsted acidity of the catalyst was observed. Under anaerobic conditions an alumina-supported mixed Nb-W-oxide catalyst gave a selectivity of more than 70% for glycerol conversions above 40%. Even better selectivity was obtained using a catalyst with tungsten oxide supported on titania, which gave 80% selectivity under aerobic conditions at high conversion.}},
  author       = {{Massa, Mariano and Andersson, Arne and Finocchio, Elisabetta and Busca, Guido}},
  issn         = {{1090-2694}},
  keywords     = {{Glycerol; Dehydration; Acrolein; Supported niobia; Supported tungsten oxide; Supported Nb-W-oxide; Al2O3; TiO2; SiO2; acidity}},
  language     = {{eng}},
  pages        = {{170--184}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Catalysis}},
  title        = {{Gas-phase dehydration of glycerol to acrolein over Al2O3-, SiO2- and TiO2-supported Nb- and W-oxide catalysts}},
  url          = {{http://dx.doi.org/10.1016/j.jcat.2013.07.022}},
  doi          = {{10.1016/j.jcat.2013.07.022}},
  volume       = {{307}},
  year         = {{2013}},
}