Patent ID: 7510598

Claim:
A gas separator comprising: a porous substrate comprising a first ceramic; and a gas-separating layer comprising zeolite disposed on a surface of said porous substrate; wherein said gas-separating layer further comprises, in addition to said zeolite, a thermal expansion coefficient-adjusting material comprising a second ceramic having a linear thermal expansion coefficient satisfying a relationship expressed by one of the following formulas (1) or (2), so that a difference between a thermal expansion coefficient of said porous substrate and a thermal expansion coefficient of said gas-separating layer is reduced: Î² 1 >Î² ZE , Î² 2 >Î² ZE (1) Î² 1 <Î² ZE , Î² 2 <Î² ZE (2) wherein Î² 1 is a linear thermal expansion coefficient of said first ceramic, Î² 2 is a linear thermal expansion coefficient of the said second ceramic, and Î² ZE is a linear thermal expansion coefficient of said zeolite.