摘要:
Device for the purification of exhaust gases from a thermal combustion engine comprising:one or several ceramic catalyst carriers comprising an arrangement of crystallites of the same size, same isodiametric morphology and same chemical composition, or approximately the same size, same isodiametric morphology and same chemical composition in which each crystallite is in point or quasi-point contact with the surrounding crystallites, andone or several active phases for chemical destruction of impurities in the exhaust gas comprising metallic particles having chemical interactions with said ceramic catalyst carrier and mechanical anchoring in said catalyst carrier such that coalescence and mobility of each particle are limited to a maximum volume corresponding to the volume of a crystallite of said ceramic catalyst carrier.
摘要:
The invention relates to a catalyst support made of a ceramic, the support comprising an arrangement of crystallites having the same size, the same isodiametric morphology and the same chemical composition or substantially the same size, the same isodiametric morphology and the same chemical composition, in which each crystallite makes point contact or almost point contact with the surrounding crystallites.
摘要:
The invention relates to a catalyst comprising: a) a catalyst support made of a ceramic, the support comprising an arrangement of crystallites having the same size, the same isodiametric morphology and the same chemical composition or substantially the same size, the same isodiametric morphology and the same chemical composition, in which each crystallite makes point contact or almost point contact with the surrounding crystallites; and b) at least one active phase comprising metallic particles that interact chemically with said catalyst support made of a ceramic and that are mechanically anchored to said catalyst support in such a way that the coalescence and mobility of each particle are limited to a maximum volume corresponding to that of a crystallite of said catalyst support.
摘要:
A method of preparing a composite includes the following steps. A powder blend is sintering while an oxygen partial pressure (pO2) of a gaseous atmosphere surrounding the powder blend is controlled. Before the sintering, a shape is formed from the powder blend. After the forming and before the sintering, binder is removed from the powder blend. The powder blend comprises binder, a mixed electronic/oxygen O2− anionic conducting compound (C1) and a compound (C2) chosen from MgO and BaTiO3. The resultant composite comprises at least 75 vol % of compound (C1), from 0.01 to 25 vol % of compound (C2), and from 0 vol % to 2.5 vol % of compound (C3).
摘要:
A method to prepare a thin ceramic or metallic solid-state composition comprising three phases: a material (A), a material (B), and pores, wherein the porous matrix of material (A) has a porosity gradient in the range of about 0% to about 80%, and wherein the pores are partially or completely filled with material (B). Various compositions and methods of use for the prepared composition are also disclosed.
摘要:
A catalytic composition comprising a catalytically active metal and a solid support, characterized in that said catalytically active metal is included into the core structure of said solid support, and said solid support is a refractory and ionic conductive oxide, process for their preparation and its use as a catalyst in synthesis gas production.
摘要:
The invention relates to a method of producing a ceramic article. According to the invention, a slip is pressure cast in a mould (12) in order to form a deposit (20) and a solution (10) containing a deflocculating agent is filtered onto said deposit (20).
摘要:
A composite material (M) comprising: at least 75% by volume of a mixed electronic conductor compound oxygen anions O (C1) selected from doped ceramic compounds which, at the temperature of use, are present in the form of a crystalline network having ion oxide lattice vacancies and, more particularly, in the form of a cubic phase, a fluorite phase, a perovskite phase, of the aurivillius variety, a Brown-Millerite phase or a pyrochlore phase; and 0.01%-25% by volume of a compound (C2) which is different from compound (C1), selected from oxide-type ceramic materials, non-oxide type ceramic materials, metals, metal alloys or mixtures of said different types of material; and 0%-2.5% by volume of a compound (C3) produced from at least one chemical reaction represented by the equation: xFC1+yFC2 - - - >zFC3, wherein FC1, FC2 and FC3 represent the raw formulae of compounds (C1), (C2) and (C3) and x, y and z represent rational numbers above or equal to 0. The invention also relates to a method for the preparation and use thereof as mixed conductor material for a membrane catalytic reactor used to synthesize synthetic gas by catalytic oxidation of methane or natural gas and/or as mixed conductor material for a ceramic membrane.
摘要:
Architecture comprising ceramic or metallic foam, characterized in that the foam has a constant axial and radial porosity between 10 to 90% with a pore size between 2 to 60 ppi, and at least one continuous and/or discontinuous, axial and/or radial concentration of catalytic active(s) phase(s) from 0.01 wt % to 100 wt %, preferentially from 0.1 to 20 wt. %, and in that the architecture has a microstructure comprising specific area ranging between 0.1 to 30 m2/g, a grain size between 100 nm and 20 microns and a skeleton densification above 95%.