The University of Tokyo

Unizeo Co., Ltd.

Mitsui Minings & Melting Co., Ltd.

Nat'l University Corp. Yokohama Nat'l University

Nippon Chemical Industrial Co., Ltd.

Mistui Mining & Smelting Co., Ltd.

National University Corporation Yokohama National University

Keiji Itabashi

Tatsuya Okubo

Shanmugam Palani Elangovan

Kenta Iyoki

Yoshihiro Kamimura

Masaru Ogura

Yoshihiro Kubota

Toyohiko Hieda

Satoshi Inagaki

Raita Komatsu

Natsume Koike

Sibel Sogukkanli

Kiyofumi Monma

Palani Elangovan Shanmugam

Akari Ogawa

Kyosuke Sodeyama

Watcharop Chaikittisilp

Palani Elangovan Shanmugan

Watchcharop Chaikittisilp

Provided is a production method with which it is possible to produce beta zeolite at high purity by suppressing the generation of impurities by a seed crystal addition method that can reduce the environmental burden as much as possible, without using an organic structure-directing agent. This method for producing beta zeolite having a step that mixes and heats an organic-compound-free reaction mixture comprising a silica source, alumina source, alkali source, and water with beta zeolite seed crystals, wherein (I) beta zeolite synthesized without using an organic structure-directing agent and having 90% or more by volume of particles 10 &#x3bc;m or less in diameter in the particle size distribution by a laser diffraction scattering-type particle size distribution measurement method is used, (III) acid-treated zeolite in which the SiO/AlOratio is 150 or less is prepared by (II) contact treatment with an acidic aqueous solution, and the acid-treated zeolite is used as the beta zeolite seed crystals.

Method of producing beta zeolite

Provided is a mordenite zeolite which can be produced without using an organic structure-directing agent, and has superior multivalent metal cation exchange capability. The mordenite zeolite according to the present invention containing silicon, a divalent metal M and aluminum in a skeletal structure, wherein the mordenite zeolite has the following atomic ratios in the state of Na-form. The mordenite zeolite preferably has a BET specific surface area of 250 m/g or more and 500 m/g or less and a micropore volume of 0.07 cc/g or more and 0.25 cc/g or less in the state of Na-form or H-form. Si/(M+Al)=5 or more and 10 or less, M/(M+Al)=0.1 or more and less than 1, and Na/(M+Al)=1 or more and less than 2.

Mordenite zeolite and production method therefor

The purpose of the present invention is to provide a beta zeolite which includes zinc and has a small particle size. This beta zeolite includes a silicon oxide and a zinc oxide, and has an average particle size of 50 to 100 nm at a cumulative frequency of 50% in a particle size distribution measured by scanning electron microscope observation.

Beta zeolite and method for producing same

Disclosed is a method for readily and inexpensively producing zeolite without using an organic structure-directing agent (organic SDA). Specifically disclosed is a method whereby a gel containing a silica source, an alumina source, an alkaline source and water is reacted with zeolite seed crystals, to produce a zeolite with the same kind of skeletal structure as the zeolite. The gel used is a gel of a composition whereby, when a zeolite is synthesized from this gel only, the synthesized zeolite comprises at least one of the kinds of composite building units of the target zeolite.

Zeolite production method

The objective of the invention is to provide an MSE-type zeolite production method such that an MSE-type zeolite can be produced in a comparatively short heating time by using inexpensive tetraethylammonium ion. The production method of the present invention comprises steps of:

MSE-type zeolite production method

Provided is a method for producing a beta zeolite, which is a seed crystal addition method that is capable of reducing the environmental load as much as possible. A method for producing a beta zeolite according to the present invention comprises a step wherein a reaction mixture that contains a silica source, an alumina source, an alkali source and water and a seed crystal that is composed of a beta zeolite are mixed with each other and heated. A beta zeolite which comprises particles having a particle size of 10 &#x3bc;m or less in an amount of 90% or more on a volume basis in the particle size distribution as determined by a laser diffraction/scattering particle size distribution measuring method, and which is synthesized without using an organic structure-directing agent is used as the seed crystal.

Method for producing beta zeolite

A MSE-type zeolite which has a Si/Al ratio of 5 or more, is a proton-type zeolite, and is obtained by transforming a raw material MSE-type zeolite synthesized without using a structure directing agent into an ammonium-type zeolite through ion exchange, then, exposing the MSE-type zeolite to water vapor, and subjecting the exposed MES-type zeolite to an acid treatment.

Zeolite, manufacturing method of the same, and catalytic cracking catalyst of paraffin

To provide a hydrocarbon reforming/trapping material which is capable of adsorbing and reforming a hydrocarbon. A hydrocarbon reforming/trapping material of the present invention has an SiO/Al2Oratio of from 7 to 12, and contains an Fe(II)-substituted beta zeolite which is ion-exchanged by Fe(II) ions. The amount of supported Fe(II) is preferably 0.001-0.5 mmol/g with respect to the Fe(II)-substituted beta zeolite. This Fe(II)-substituted beta zeolite is suitably produced by dispersing and mixing a beta zeolite having an SiO/AlOratio of from 7 to 12 in an aqueous solution of a water-soluble compound of divalent iron, and mixing and stirring the solution, so that Fe(II) ions are supported on the beta zeolite.

Hydrocarbon reforming/trapping material and method for removing hydrocarbon

The method for producing an MTW-type zeolite according to the present invention includes: mixing a silica source, an alumina source, an alkali source, a lithium source, and water so as to obtain a reaction mixture having a composition represented by specific molar ratios; (2) adding an MTW-type zeolite which has a SiO/AlOratio of 10 to 500 and does not contain an organic compound, as a seed crystal, to the reaction mixture in a proportion of 0.1 to 20% by weight relative to the silica component in the reaction mixture; and (3) airtightly heating the reaction mixture, to which the seed crystal has been added, at 100 to 200&#xb0; C.

Method for producing MTW-type zeolite

The present invention provides a beta zeolite that is useful as a catalyst, adsorbent agent, or the like, and that is both microporous and mesoporous. The beta zeolite is characterized by (i) the SiO/AlOratio being 8-30, and the SiO/ZnO ratio being 8-1000, (ii) the micropore surface area being 300-800 m/g, (iii) the micropore volume being 0.1-0.3 cm/g, and (iv) having mesopores having, in the state as synthesized, a diameter of 2-6 nm and a volume of 0.001-0.3 cm/g. The beta zeolite is favorably produced by means of adding and reacting a zinc silicate beta zeolite as a seed crystal with a reaction mixture containing a silica source, an alumina source, an alkali source, and water.

The purpose of/problem to be addressed by the present invention is to provide: an Fe(II)-substituted beta-type zeolite useful for the catalytic removal of a variety of gases; and a production method therefor. The SiO/AlOratio in this Fe(II)-substituted beta-type zeolite is equal to or more than 7 but less than 10. This Fe(II)-substituted beta-type zeolite is obtained by being subjected to ionic exchange with Fe(II) ions. It is preferable that the Fe(II) loading amount be in the range of 0.001-0.4 mmol/g of the Fe(II)-substituted beta-type zeolite. It is preferable that the Fe(II)-substituted beta-type zeolite be produced using a method in which a beta-type zeolite having an SiO/AlOratio of equal to or more than 7 but less than 10 is dispersed in an Fe(II) water-soluble-compound aqueous solution, and then mixed and agitated to cause the beta-type zeolite to carry Fe(II) ions.

Fe(II)-substituted beta-type zeolite, production method therefor and gas adsorbent including same, and nitric oxide and hydrocarbon removal method

A process for producing a VET-type zeolite is provided in which the use of a structure-directing agent is minimized and the environmental burden can be minimized. This process for producing a VET-type zeolite comprises (1) mixing a zinc source, an element Msource, an alkali source, and water so as to result in a reaction mixture having a specific composition in terms of molar ratio, (2) using, as seed crystals, a VET-type zeolite which has an MO/ZnO ratio of 5-30 and adding the zeolite to the reaction mixture in an amount of 0.1-30 wt % relative to the MOcontained in the reaction mixture, and (3) heating the reaction mixture to which the seed crystals have been added, at 80-200&#xb0; C. in a hermetically closed state. Mrepresents silicon or a mixture of silicon and germanium.

Process for producing VET-type zeolite

Provided is a method for producing a MAZ-type zeolite, the method having an environmental impact which has been reduced as much as possible while not using a structure-directing agent as far as possible. In the method for producing a MAZ-type zeolite according to the present invention: (1) a silica source, an alumina source, an alkali source and water are mixed so as to form a reaction mixture that has a composition represented by a specific molar ratio; (2) a MAZ-type zeolite, which has a SiO/AlOratio of 5-10, has an average particle diameter of at least 0.1 &#x3bc;m and does not contain an organic compound, is added, as a seed crystal, into the reaction mixture in an amount of 0.1-30 weight % relative to the silica components in the reaction mixture; and (3) the reaction mixture, into which the seed crystal has been added, is heated at 80-200&#xb0; C. in a closed system.

Growing community of inventors

Tokyo, Japan

Keiji Itabashi