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Pore Condensation in Glycerol Dehydration : Modification of a Mixed Oxide Catalyst

Hulteberg, Christian LU ; Leveau, Andreas and Brandin, Jan Gunnar Meo LU (2017) In Topics in Catalysis p.1-11
Abstract

Pore condensation has been suggested as an initiator of deactivation in the dehydration of glycerol to acrolein. To avoid potential pore condensation of the glycerol, a series of WO3 supported on ZrO2 catalysts have been prepared through thermal sintering, with modified pore systems. It was shown that catalysts heat treated at temperatures above 800 °C yielded suitable pore system and the catalyst also showed a substantial increase in acrolein yield. The longevity of the heat-treated catalysts was also improved, indeed a catalyst heat treated at 850 °C displayed significantly higher yields and lower pressure-drop build up over the 600 h of testing. Further, the catalyst characterisation work gave evidence for a... (More)

Pore condensation has been suggested as an initiator of deactivation in the dehydration of glycerol to acrolein. To avoid potential pore condensation of the glycerol, a series of WO3 supported on ZrO2 catalysts have been prepared through thermal sintering, with modified pore systems. It was shown that catalysts heat treated at temperatures above 800 °C yielded suitable pore system and the catalyst also showed a substantial increase in acrolein yield. The longevity of the heat-treated catalysts was also improved, indeed a catalyst heat treated at 850 °C displayed significantly higher yields and lower pressure-drop build up over the 600 h of testing. Further, the catalyst characterisation work gave evidence for a transition from monoclinic to triclinic tungsten oxide between 850 and 900 °C. There is also an increase in acid-site concentration of the heat-treated catalysts. Given the improved catalyst performance after heat-treatment, it is not unlikely that pore condensation is a significant contributing factor in catalyst deactivation for WO3 supported on ZrO2 catalysts in the glycerol dehydration reaction.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Acrolein, Deactivation, Dehydration, Glycerol, Pore condensation
in
Topics in Catalysis
pages
11 pages
publisher
Kluwer
external identifiers
  • scopus:85019753837
ISSN
1022-5528
DOI
10.1007/s11244-017-0827-8
language
English
LU publication?
yes
id
a0950ff7-b121-4dba-ac6c-6db36fcb71d0
date added to LUP
2017-06-08 14:00:48
date last changed
2017-06-08 14:00:48
@article{a0950ff7-b121-4dba-ac6c-6db36fcb71d0,
  abstract     = {<p>Pore condensation has been suggested as an initiator of deactivation in the dehydration of glycerol to acrolein. To avoid potential pore condensation of the glycerol, a series of WO<sub>3</sub> supported on ZrO<sub>2</sub> catalysts have been prepared through thermal sintering, with modified pore systems. It was shown that catalysts heat treated at temperatures above 800 °C yielded suitable pore system and the catalyst also showed a substantial increase in acrolein yield. The longevity of the heat-treated catalysts was also improved, indeed a catalyst heat treated at 850 °C displayed significantly higher yields and lower pressure-drop build up over the 600 h of testing. Further, the catalyst characterisation work gave evidence for a transition from monoclinic to triclinic tungsten oxide between 850 and 900 °C. There is also an increase in acid-site concentration of the heat-treated catalysts. Given the improved catalyst performance after heat-treatment, it is not unlikely that pore condensation is a significant contributing factor in catalyst deactivation for WO<sub>3</sub> supported on ZrO<sub>2</sub> catalysts in the glycerol dehydration reaction.</p>},
  author       = {Hulteberg, Christian and Leveau, Andreas and Brandin, Jan Gunnar Meo},
  issn         = {1022-5528},
  keyword      = {Acrolein,Deactivation,Dehydration,Glycerol,Pore condensation},
  language     = {eng},
  month        = {05},
  pages        = {1--11},
  publisher    = {Kluwer},
  series       = {Topics in Catalysis},
  title        = {Pore Condensation in Glycerol Dehydration : Modification of a Mixed Oxide Catalyst},
  url          = {http://dx.doi.org/10.1007/s11244-017-0827-8},
  year         = {2017},
}