Premium
Regeneration of Silica‐Supported Silicotungstic Acid as a Catalyst for the Dehydration of Glycerol
Author(s) -
Katryniok Benjamin,
Paul Sébastien,
Capron Mickaël,
BellièreBaca Virginie,
Rey Patrick,
Dumeignil Franck
Publication year - 2012
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201100635
Subject(s) - silicotungstic acid , dehydration , catalysis , glycerol , chemistry , chemical engineering , organic chemistry , biochemistry , engineering
The dehydration reaction of glycerol to acrolein is catalyzed by acid catalysts. These catalysts tend to suffer from the formation of carbonaceous species on their surface (coking), which leads to substantial degradation of their performances (deactivation). To regenerate the as‐deactivated catalysts, various techniques have been proposed so far, such as the co‐feeding of oxygen, continuous regeneration by using a moving catalytic bed, or alternating between reaction and regeneration. Herein, we study the regeneration of supported heteropolyacid catalysts. We show that the support has a strong impact on the thermal stability of the active phase. In particular, zirconia has been found to stabilize silicotungstic acid, thus enabling the nondestructive regeneration of the catalyst. Furthermore, the addition of steam to the regeneration feed has a positive impact by hindering the degradation reaction by equilibrium displacement. The catalysts are further used in a periodic reaction/regeneration process, whereby the possibility of maintaining long‐term catalytic performances is evidenced.