Zeolite membrane, production method therefor, and separation method using same

Abstract

One object of the present invention is to provide a zeolite membrane that can achieve both practically sufficient separation performance and throughput and maintain the separation performance stably for a long period. Provided is a method of producing a zeolite membrane having CHA crystal structure on an intermediate layer of a porous support, wherein Si/Al (a molar ratio) of CHA zeolite particles is from 9.5 to 100.5 and, in an X-ray diffraction pattern obtained by applying X-ray onto a surface of the zeolite membrane, a peak intensity near 2θ=18° is less than 0.5 times a peak intensity near 2θ=21°, and/or a peak intensity near 2θ=10° is less than 4 times a peak intensity near 2θ=21°, the method including: forming the zeolite membrane having the CHA crystal structure on the intermediate layer of the porous support by hydrothermal synthesis, using an aqueous reaction mixture including a Si element source, an Al element source, an alkali source, and an organic template, wherein non-dealuminated FAU zeolite is used as the Si element source and the Al element source.