The present invention provides a method for manufacturing zeolite which is useful as catalyst carrier for exhaust gas clean up by decomposition, reduction or oxidation catalyst carrier for synthesis andor decomposition of organic or inorganic chemicals, and membrane for selective separation of organic substances, gases and inorganic cations. A gas is supplied from a gas supplier into an inflation chamber through a gas distribution pipe provided within the gas-introducing path, whereby the airbag is inflated and deployed like a curtain along a sidewall of a vehicle compartment so as to protect a head of an occupant. An intermediate process for producing a composite composition with diamond nuclei is also described.