title: Regeneration of silica-supported silicotungstic acid as a catalyst for the dehydration of glycerol.
abstract: 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.
authors.affiliation: Univ. Lille Nord de France, Ecole Centrale de Lille, Unité de Catalyse et de Chimie du Solide (UMR8181), Cité Scientifique, F-59655 Villeneuve d'Ascq, France. benjamin.katryniok@ec-lille.fr
authors.forename: Benjamin
authors.initials: B
authors.lastname: Katryniok
authors.forename: Sébastien
authors.initials: S
authors.lastname: Paul
authors.forename: Mickaël
authors.initials: M
authors.lastname: Capron
authors.forename: Virginie
authors.initials: V
authors.lastname: Bellière-Baca
authors.forename: Patrick
authors.initials: P
authors.lastname: Rey
authors.forename: Franck
authors.initials: F
authors.lastname: Dumeignil
mesh_terms: D000171:Acrolein / Q000737:chemistry; D000388:Air; D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D005990:Glycerol / Q000737:chemistry*; D055772:Green Chemistry Technology; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D017640:Silicates / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D017640:Silicates; D017973:Tungsten Compounds; D014867:Water; D002244:Carbon; D012822:Silicon Dioxide; D000171:Acrolein; C021746:silicotungstic acid; D009584:Nitrogen; D005990:Glycerol