Ngk Insulators, Inc.

Ryotaro Yoshimura

Kenichi Noda

Aya Miura

Takeshi Hagio

Makoto Miyahara

Katsuya Shimizu

Masahiro Furukawa

Ko Kobayashi

A zeolite membrane complex includes a porous support and a zeolite membrane formed on the support. Water molecules are adsorbed in the zeolite membrane. A decreasing rate of water content in the zeolite membrane from 250° C. to 500° C. is 0.1% or more.

Zeolite membrane complex, method of producing zeolite membrane complex, method of treating zeolite membrane complex, and separation method

A zeolite membrane complex comprises: a support; and a zeolite membrane formed on the support. The membrane is of SAT-type zeolite, and in an X-ray diffraction pattern obtained by X-ray irradiation to the zeolite membrane, a peak intensity around 2&#x3b8;=13.9&#xb0; is 1.5 times or more a peak intensity around 2&#x3b8;=8.5&#xb0;.

Zeolite membrane complex and method of producing zeolite membrane complex

Seed crystals are crystals of zeolite to be attached onto a support in production of a zeolite membrane complex including the support and a zeolite membrane formed on the support. The specific surface area of the seed crystals is not smaller than 10 m/g and not larger than 150 m/g. The strength obtained from a crystal component at a diffraction angle 2&#x3b8; indicating a maximum peak in a range of diffraction angle 2&#x3b8; from 12&#xb0; to 25&#xb0; in an X-ray diffraction pattern obtained by emitting X-ray to the seed crystals is not less than once and not more than 30 times that obtained from an amorphous component. It is thereby possible to improve adherence of the seed crystals to the support.

Seed crystals, method of producing seed crystals, method of producing seed crystals attachment support, and method of producing zeolite membrane complex

A zeolite membrane complex includes a support and a zeolite membrane formed on the support. The zeolite membrane is of an SAT-type zeolite. Among particles on the surface of the zeolite membrane, particles that have aspect ratios higher than or equal to 1.2 and lower than or equal to 10 account for 85% or more of the area of the surface of the zeolite membrane. This improves the orientations of the particles and also reduces the interstices among the particles. As a result, the denseness of the zeolite membrane is improved. Accordingly, for example, high gas separation performance can be obtained when the zeolite membrane complex is used as a gas separation membrane.

A peak intensity of a (002) plane is greater than or equal to 0.5 times a peak intensity of a (100) plane in an X-ray diffraction pattern obtained by irradiation of X-rays to a membrane surface of the ERI membrane.

ERI-structure zeolite membrane and membrane structure

A seed crystal is a crystal of zeolite that is to be deposited on a support when producing a zeolite membrane complex that includes the support and a zeolite membrane formed on the support. A volume-cumulative particle size distribution of the seed crystal, measured by a laser diffraction scattering method, has a coefficient of variation of 0.5 or less and a kurtosis of 5 or less. Use of these seed crystals improves the bonding of zeolite crystals when producing the zeolite membrane. As a result, a dense zeolite membrane can be formed.

Zeolite seed crystal, method of producing zeolite seed crystal, method of producing zeolite membrane complex, and separation method

A peak intensity of a (110) plane is greater than or equal to 2.5 times a peak intensity of a (004) plane in an X-ray diffraction pattern obtained by irradiation of X-rays to a membrane surface of the AFX membrane.

Zeolite membrane having AFX structure, membrane structure, and method for manufacturing membrane structure

The monolithic base is a porous alumina body that includes pores and that is configured by alumina particles as an aggregate and an oxide phase as a binding material. The alumina particles include microscopic alumina particles having a particle diameter of greater than or equal to 0.5 &#x3bc;m and less than or equal to 5 &#x3bc;m and coarse alumina particles having a particle diameter of greater than 5 &#x3bc;m. The number of microscopic alumina particles that are encapsulated in the oxide phase is greater than or equal to 50% of the total number of microscopic alumina particles and coarse alumina particles.

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Nagoya, Japan

Ryotaro Yoshimura