摘要:
The invention relates to a catalytic system that comprises palladium dispersed on a substrate made of zirconium oxide ZrO 2 and praseodymium oxide Pr 6 O 11 , the mass ratio between the zirconium and praseodymium oxides being from 5 to 20%. The invention is particularly adapted for processing exhaust gases having a temperature of between 120°C and 400°C, and having a carbon monoxide concentration of between 2000 and 5000 ppm.
摘要:
The present invention relates to the use of solids consisting of a metal-organic framework (MOF) and having the units of the following formula (I): MmOkXILp as a nitrogen-oxide catalyst. The present invention also relates to devices for enabling the implementation of said use. The nitrogen oxides in question are nitrogen monoxide and nitrogen dioxide, collectively referred to as NOx. The MOF solids of the present invention are advantageously capable of removing nitrogen oxides from a liquid or gaseous effluent, for example from water, from the exhaust gases of a vehicle, factory, workshop, laboratory, stored products, urban air vents, etc., without any reducing agent and at a low temperature. The DeNOx catalysis is a major issue for our societies. The invention can be used for reducing or even avoiding the consequences for public health of the toxic NOx gases resulting from human activity.
摘要:
The present invention relates to reducible porous crystalline solids, constituted of a metal-organic framework (MOF), for the separation of mixtures of molecules having different degrees and/or a different number of unsaturations with a selectivity that can be adjusted by controlling the reduction of the MOF. The MOF solids of the present invention have, after reduction, a strong affinity for molecules containing at least one unsaturated group. They may be used in various separation processes, especially those concerning hydrocarbons.
摘要:
The invention concerns a method for depositing nanoparticles of a metal or of an alloy of said metal, the metal being selected among the metals of columns VIIIB and IB of the periodic table, dispersed on a substrate, by chemical vapour deposition (CVD), from one or more precursors, wherein the deposition is carried out in the presence of a gas comprising over 50 vol. % of an oxidizing reactive gas. The invention also concerns a substrate comprising at least one surface whereon are dispersed nanoparticles of metal or metal alloy, for example, of silver or a silver alloy. The invention further concerns the use of the substrate for catalyzing a chemical reaction, for example a reaction for eliminating NOx.