Porous support-zeolite membrane composite
View Patent ↗The present invention relates to a process for producing a porous support-zeolite membrane composite, which comprises forming a CHA type zeolite membrane on a porous support by a hydrothermal synthesis in the presence of seed crystals, wherein an FAU type zeolite is used as the seed crystals.
1. A porous support-zeolite membrane composite comprising a porous support and a zeolite membrane formed on the porous support,
wherein in a water vapor diffusion measurement, the time period Q (minutes) required for the detection intensity of desorbed water to decrease from a maximum value to 1/20 thereof satisfies the following expression (2):
7.0< Q< 30 (2)
2. The porous support-zeolite membrane composite according to claim 1 , wherein the zeolite membrane is a CHA type zeolite membrane.
3. The porous support-zeolite membrane composite according to claim 1 , wherein the zeolite membrane has an SiO 2 /Al 2 O 3 molar ratio, as determined through a measurement made from the membrane surface side, of 15 or less.