title: Stabilizer effects on the synthesis of gold-containing microparticles. Application to the liquid phase oxidation of glycerol.
abstract: Gold-containing poly(urea-formaldehyde) microparticles were prepared by the in situ polymerization method using a series of stabilization agents with different chemical nature. The effects of cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS), polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and tetrakis(hydroxymethyl)phosphonium chloride (THPC) on the morphology, the particle size of encapsulated gold, the gold particle size distribution and the encapsulation efficiency were investigated by using scanning electron microscopy, X-ray diffraction and atomic absorption analyses. The chemical nature of stabilizer had a marked influence on both the encapsulated gold particle size and the encapsulation efficiency. Both gold particle size and gold encapsulation efficiency increased when decreasing the stabilizer polarity number. All the microparticles here prepared were tested in the liquid phase selective oxidation of glycerol. The glycerol conversion increased and the glyceric acid selectivity decreased when decreasing gold particle sizes. Results showed that use of stabilizers with hydrophobic surfaces enhanced the selectivity to C3 products in the resulting catalysts. On the other hand, the use of stabilizers with hydrophilic surfaces increased the C-C bond cleavage products in the resulting catalysts.
authors.affiliation: Départment Chimie-Biochimie, Institut de recherches sur la catalyse et l'environnement de Lyon, Faculté des Sciences et Technologies Université Claude Bernard Lyon 1, 69622 Villeurbanne, France.
authors.forename: Sonia
authors.initials: S
authors.lastname: Gil
authors.affiliation: Department of Chemical Engineering, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain.
authors.forename: Carmen
authors.initials: C
authors.lastname: Jiménez-Borja
authors.affiliation: Department of Chemical Engineering, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Martin-Campo
authors.affiliation: Department of Chemical Engineering, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain.
authors.forename: Amaya
authors.initials: A
authors.lastname: Romero
authors.affiliation: Department of Chemical Engineering, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain.
authors.forename: José Luis
authors.initials: JL
authors.lastname: Valverde
authors.affiliation: Department of Chemical Engineering, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain. Electronic address: marialuz.sanchez@uclm.es.
authors.forename: Luz
authors.initials: L
authors.lastname: Sánchez-Silva
mesh_terms: D002384:Catalysis; D005990:Glycerol / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size
chemical_list: D006046:Gold; D005990:Glycerol
keywords: Glycerol oxidation; Gold catalysts; In situ polymerization; Stabilizer