Mitsui Mining & Smelting Company, Ltd.

The University of Tokyo

Unizeo Co., Ltd.

Nippon Chemical Industrial Co., Ltd.

Yokohama National University

Tottori University

Yoshihiro Kamimura

Tatsuya Okubo

Keiji Itabashi

Shanmugam Palani Elangovan

Yasuo Yamazaki

Satoshi Inagaki

Naonobu Katada

Yoshihiro Kubota

Satoshi Suganuma

Akira Endou

Palani Elangovan Shanmugam

Watcharop Chaikittisilp

Watchcharop Chaikittisilp

Provided are the following: an MWW type zeolite which has many Br&#xf8;nsted acid sites when in the form of a proton type and which is highly suitable as a cracking catalyst for cumene; a method for producing same; and an application of same. The present invention provides an MWW type zeolite in which the ratio (B/A) of the peak intensity (B) attributable to tetracoordinate aluminum relative to the peak intensity (A) attributable to hexacoordinate aluminum is 2 or more inAl MAS NMR, when measured as an ammonium type. The present invention also provides a method for producing an MWW type zeolite, the method having a step for carrying out a hydrothermal synthesis reaction in the presence of: a seed crystal of an MWW type zeolite containing no organic structure-directing agent; and a reaction mixture containing a silica source, an alumina source, an alkali source, an organic structure-directing agent, and water. The reaction mixture satisfies the following molar ratio: X/SiO&#x3c;0.15 (here, X denotes the number of moles of the organic structure-directing agent).

MWW type zeolite, method for producing same, and cracking catalyst

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

Provided is a method for producing an MTW-type zeolite. The reaction mixture contains a silica source, an alumina source, an alkali source, and water is reacted with a seed crystal of a zeolite to produce an MTW-type zeolite. The reaction mixture has a composition, which makes a synthesized zeolite contain an MFI-type zeolite when the zeolite is synthesized solely from the reaction mixture, is used. As the seed crystal, a beta-type zeolite which has a ratio of SiO/AlOof 8 to 50 and does not contain a structure direction agent is used. The seed crystal is added to the reaction mixture, in a proportion of 0.1% by mass to 20% by mass based on a silica component in the reaction mixture. The reaction mixture to which the seed crystal has been added is heated at 100&#xb0; C. to 200&#xb0; C. in a sealed state.

Method for producing MTW-type zeolite

A zeolite beta according to the present invention has a SiO/AlOratio of 10 to 16 and is aluminum-rich. The zeolite beta has a BET specific surface area measured in the state of a sodium type of 500 to 700 m/g, a micropore specific surface area of 350 to 500 m/g, and a micropore volume of 0.15 to 0.25 cm/g.

Zeolite beta and process for producing the same

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Tokyo, Japan

Yoshihiro Kamimura