L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

L'air Liquide, Societe Anonyme a Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude

Gregory Etchegoyen

Thierry Chartier

Pascal Del-Gallo

Pascal Del Gallo

A method of preparing a composite includes the following steps. A powder blend is sintering while an oxygen partial pressure (pO) 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 Oanionic conducting compound (C) and a compound (C) chosen from MgO and BaTiO. The resultant composite comprises at least 75 vol % of compound (C), from 0.01 to 25 vol % of compound (C), and from 0 vol % to 2.5 vol % of compound (C).

Addition of (A) blocking agent(s) in a ceramic membrane for blocking crystalline growth of grains during atmospheric sintering

A composite material (M) comprising: at least 75% by volume of a mixed electronic conductor compound oxygen anions O&#x3c;2-&#x3e;(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 (C) produced from at least one chemical reaction represented by the equation: xFC1+yFC2 - - - &#x3e;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.

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Rilhac-Rancon, France

Gregory Etchegoyen