From hydrocolloids to high specific surface area porous supports for catalysis.
Polysaccharide hydrogels are effective supports for heterogeneous catalysts. Their use in solvents different from water has been hampered by their instability upon drying. While the freeze-drying process or air-drying of hydrocolloid gels led to compact solids with a low surface area, drying the gel in CO2 beyond the critical point provided mesoporous materials with a high specific surface area. Their effectiveness as a support for catalysis was exemplified in the reaction of substitution of an allyl carbonate with morpholine catalyzed by the hydrosoluble Pd(TPPTS)3 complex. The influence of water on the catalytic activity and the properties of the support was evidenced.
Valentin
Romain
R
Laboratoire des Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 ENSCM-CNRS-UM1 Institut Gerhart FR 1878, 8 Rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France.
Molvinger
Karine
K
Viton
Christophe
C
Domard
Alain
A
Quignard
Françoise
F
D000327:Adsorption; D000464:Alginates / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002245:Carbon Dioxide / Q000737:chemistry; D002254:Carbonates / Q000737:chemistry; D002351:Carrageenan / Q000737:chemistry; D002384:Catalysis; D048271:Chitosan / Q000737:chemistry; D003102:Colloids / Q000737:chemistry*; D005615:Freezing; D020100:Hydrogels / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D008968:Molecular Conformation; D008969:Molecular Sequence Data; D009025:Morpholines / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D014783:Viscosity; D014867:Water / Q000737:chemistry
D000464:Alginates; D001672:Biocompatible Materials; D002254:Carbonates; D003102:Colloids; D020100:Hydrogels; D009025:Morpholines; D011108:Polymers; D011134:Polysaccharides; D012997:Solvents; D014867:Water; D002245:Carbon Dioxide; C037574:morpholine; D002351:Carrageenan; D048271:Chitosan