摘要:
The invention concerns a method for so-called two-phase impregnation of a β-SiC support with high specific surface area, said method comprising at least the following steps: (a) a first impregnating step which consists in impregnating at least once said support with a polar agent A, (b) a second impregnating step which consists in impregnating at least once said support with at least an agent B less polar than agent A. Said method enables the production of novel catalysts for heterogeneous catalysis.
摘要:
The present invention relates to catalytic compositions for, inter alia , the photocatalytic oxidation of CO, including: a substrate including, at least at a surface thereof, titanium oxide; and, deposited on the titanium oxide on the surface of the substrate, a metal mixture containing: platinum, at least partially in the metal state; and palladium and/or nickel, at least partially in the metal state. More specifically, the invention relates to the use of said compositions for treating gaseous media including CO and organic pollutants, for example indoor air in inhabited buildings or vehicles.
摘要:
The invention relates to a photocatalyst that comprises a cellular foam selected from carbon foam and the foam of a carbonated material such as a polymer, and a photocatalytically active phase directly deposited on said cellular foam or on an intermediate phase deposited on said cellular foam. The average size of the cells is 2500 μm to 5000 μm. The foam may comprise nanotubes or nanofibres (particularly of TiO 2 ).
摘要:
The invention relates to a chemical reactor having a nanometric structure and including at least one member in which is formed at least one reaction chamber, said chamber being at least partially filled with a high specific-surface material having a specific surface higher than 5 m 2 /g, characterised in that said high specific-surface material is selected from nanotubes or nanofibres. The nanotubes or nanofibres are preferably selected in the group comprising β-SiC nanotubes or nanofibres and TiO 2 nanotubes or nanofibres. They can be deposited on an intermediate structure selected in the group comprising glass fibres, carbon fibres, SiC foams, carbon foams, cellular β-SiC foams, said intermediate structure at least partially filling the reaction chamber of the reactor.
摘要:
The invention relates to textile fibres at least partially covered with a nanometric-sized semiconducting material having photocatalytic properties for degrading chemical compounds, in particular chemical or biological agents, wherein said semiconducting material is in the form of nanostructures or nanocomposites with a one-dimensional morphology. The textile fibres can be used for applications in the military, medical, and civilian domains, etc. The curves 60 and 62 respectively show the photocatalytic degradation of organic compounds at the surface of textile fibres covered with nanostructures or nanocomposites having a one-dimensional morphology according to the invention, and nanoparticles having a granular morphology according to the prior art. The nanostructures or nanocomposites of the invention 60 are more efficient.