Dip-coating on TiO2 foams using a suspension of Pt-TiO2 nanopowder synthesized by laser pyrolysis- : preliminary evaluation of the catalytic performances of the resulting composites in deVOC reactions

• Published in: Journal of the European Ceramic Society Vol. 27; no. 2-3; pp. 931 - 936
• Main Authors: GIRAUD, Sophie, LOUPIAS, Guillaume, MASKROT, Hicham, HERLIN-BOIME, Nathalie, VALANGE, Sabine, GUELOU, Erwan, BARRAULT, Joël, GABELICA, Zelimir
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Oxford Elsevier 2007
• Subjects: Catalysis; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Pyrolysis; Catalytic reaction; Composites; Nanoparticle; Transition element compounds; Suspension; Volatile organic compound; Laser pyrolysis; Composite material; Powder; Heterogeneous catalysis; Platinum; Laser; Dip coating; Titanium oxide
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2006.04.134

In an extension of a study to generate ceramic-metal nanosized composites deposited on ceramic foams, a new route to prepare Pt-TiO2 nanopowders of controlled metallic size and their further coating on TiO2 foams is described. Their efficiency as catalysts in volatile organic compound elimination (deVOC) reactions was evaluated and compared with corresponding classical unsupported mixed powders. Composite metal/ceramic nanopowders (Pt-TiO2) were synthesised by laser pyrolysis using organo-metallic precursors. Successive dip-coatings on TiO2 foams using aqueous slurries of nanodispersed Pt-TiO2 particles were achieved. Both foam-supported and unsupported Pt-TiO2 grains of about 20 nm were stabilised, confirming no significant particle coalescence after a thermal treatment at 460 C. Both proved equally efficient catalysts for the total oxidation of methanol, selected as a probe deVOC reaction, thereby demonstrating that the dispersion of the nanopowders over the preformed ceramics did not modify their catalytic performance. 26 refs.