Materials chemistry for catalysis : Coating of catalytic oxides on metallic foams

E. Bordes-Richard (1) , A. Essakhi (1) , V. Le Courtois (1) , Axel Löfberg (1) , V. Meille (2) , B. Mutel (3) , S. Paul (1) , Philippe Supiot (3) , Ph. Rodriguez (2)

1 UCCS - Unité de Catalyse et Chimie du Solide - UMR 8181
2 LGPC - Laboratoire de Génie des Procédés Catalytiques
3 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520

Catalytic structured reactors are designed to improve both heat and mass transfers during reactions in the presence of catalytic layers. The know-how acquired in the coating of stainless steel walls by catalytic layers of VOx/TiO2, active in the abatement of volatile organic compounds and in the production of chemical intermediates, was extended to metallic foams. The preferred and original way was to first make a deposit of a silica-like primer by cold plasma assisted polymerization of tetramethyldisiloxane in the presence of oxygen. After mineralisation, this layer was supposed to act as a barrier against poisoning by elements of the metallic substrate, as well as a stabilizer of the catalyst layers. The cells of the foam were homogeneously covered by a 5 μm-thick polysiloxane film ending in ca. 1 μm thick silica after calcination. After studying the textural properties and zeta potential of aqueous suspensions of TiO2 particles, the silica-coated foams were dipped in a 37 wt% aqueous suspension of TiO2-anatase. The final VOx/TiO2/SiO2/foams were obtained by grafting polyvanadate specie in sol-gel medium. At every step of coating, the multilayer materials were studied mainly by X-ray Photoelectron Spectroscopy and Electron Probe Micro-Analysis. Moreover the mechanical and chemical stability of the successive coatings was checked.

Domaines: Matériaux

E. Bordes-Richard, A. Essakhi, V. Le Courtois, Axel Löfberg, V. Meille, et al.. Materials chemistry for catalysis : Coating of catalytic oxides on metallic foams. Microporous and Mesoporous Materials, 2010, 140 (1-3), pp.81-88. ⟨10.1016/j.micromeso.2010.10.018⟩. ⟨hal-00533100⟩