The porous support - zeolite membrane composite

A porous support - zeolite membrane composite, which is a support to form a porous zeolite membrane formed on an inorganic porous support - zeolite membrane composite, comprising a zeolite having a zeolite membrane 8 ring oxygen less pore structure, in the case where the porous relative pressure of water vapor adsorption is obtained zeolite membrane composite 0.8 isotherm - or a porous support; zeolite SiO2 film surface / Al2O3 molar ratio than the zeolite membrane itself SiO2 / Al2O3 molar ratio above 20 82 percent at room temperature and the adsorbed amount of adsorption of water zeolite membrane composite after one week zeolite membrane composite was immersed in a 90 mass% aqueous acetic acid zeolite membrane composite under the same conditions as water - support .