Patent ID: 8545802

Claim:
A process for producing a DDR-type zeolite comprising: a raw material solution preparation step of preparing a raw material solution containing 1-adamantaneamine hydrochloride, silica (SiO 2 ), and water at a 1-adamantaneamine hydrochloride/SiO 2 molar ratio of 0.002 to 0.5 and a water/SiO 2 molar ratio of 10 to 500, wherein the raw material solution does not contain ethylenediamine: and a crystal growth step of subjecting the raw material solution and a DDR-type zeolite powder to a heat treatment in a state that both the raw material solution and the DDR-type zeolite powder are brought into contact with each other to grow crystals of the DDR-type zeolite by the use of the DDR-type zeolite powder as seed crystals.