Patent ID: 7300561
Filing Date: 2007-11-27
Classification: B01D,C01B

Abstract:
1. An oxide ion conducting ceramic membrane assembly comprising a non-zero finished volume of non-zero total thickness T, that further comprises: a) a dense layer (DL) of a solid electrolyte comprising, at the electrolysis temperature, an oxide ion crystal conducting structure, with a non-zero thicknesss t b) a first tie layer (TL) having a composition the same as that of the layer DL, said tie layer being pressed against the surface S c) two porous electrodes (PE) and (PE′) that are hybrid conductors, comprising identical or different chemical compositions, one pressed against the surface S d) a second tie layer (TL′) having a composition the same as that of the layer DL, the layer TL′ having a non-zero thickness t′ e) two porous current collectors (CC) and (CC′), comprising identical or different chemical compositions, pressed against the surfaces S f) at least one porous covering layer (CL) formed from a chemical composition chemically compatible with those of said electrodes, current collectors and solid electrolyte, the sintering temperature being very close to the sintering temperatures of the chemical compositions of said electrodes, current collectors, tie layer and solid electrolyte, wherein the layer (CL) is pressed either against the surface S wherein said membrane assembly has a tubular shape, consisting of a hollow cylinder open at least at one end, with an outside diameter D and an inside diameter d; wherein layer (DL), and surfaces S wherein a thickness T of the membrane assembly is equal to half of the difference (D-d) and also equal to the sum of the thicknesses of each of the elements of the assembly; and wherein the finished volume of thickness T. comprises an intermediate layer (IL wherein said layer (IL wherein said layer is pressed against the surface S wherein said layer has a non-zero thickness t