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

Cross-section of strut of stainless steel foam coated by TiO 2 supported on silica-like micronic layer (Electron probe micro-analysis). [Display omitted] ► Improved heat and mass transfers favour higher selectivity in ODH of propane. ► VO x /TiO 2 catalyst was coated onto stainless steel foam. ► A s...

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Published in:Microporous and mesoporous materials 2011-04, Vol.140 (1), p.81-88
Main Authors: Essakhi, A., Löfberg, A., Paul, S., Mutel, B., Supiot, P., Le Courtois, V., Rodriguez, P., Meille, V., Bordes-Richard, E.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Chemical Sciences
Chemistry
Coating
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Electron probes
Emulsions. Microemulsions. Foams
Exact sciences and technology
Foamed metals
Foams
General and physical chemistry
Material chemistry
Metallic foam
Polymerization
Porous materials
RPECVD
Silicon dioxide
Structured reactors
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TiO 2-anatase coating
Titanium dioxide
VO x/TiO 2 catalyst coating
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Summary:Cross-section of strut of stainless steel foam coated by TiO 2 supported on silica-like micronic layer (Electron probe micro-analysis). [Display omitted] ► Improved heat and mass transfers favour higher selectivity in ODH of propane. ► VO x /TiO 2 catalyst was coated onto stainless steel foam. ► A silica interlayer was deposited on foam by RPECVD. ► Chemical and mechanical stability was strong. ► Selectivity to propene on foam was higher by 15% vs. powder. 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 VO x /TiO 2, 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 TiO 2 particles, the silica-coated foams were dipped in a 37 wt.% aqueous suspension of TiO 2-anatase. The final VO x /TiO 2/SiO 2/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.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2010.10.018