Zeolite production method
AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsKeiji Itabashi, Tatsuya Okubo, Yoshihiro Kamimura, Shanmugam Palani Elangovan
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Abstract
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.
Claims3
A method of producing a zeolite comprising:
- reacting a gel and zeolite seed crystals to produce a zeolite having the same kind of skeletal structure as the zeolite seed crystals;
- wherein:
- the gel comprises a silica source, an alumina source, an alkali source and water;
- the gel is capable of synthesizing a zeolite without the use of the zeolite seed crystals, wherein the zeolite synthesized without the use of the zeolite seed crystals comprises one or more building units of zeolite;
- the zeolite seed crystals comprise one or more composite building units of zeolite;
- the zeolite seed crystals and the zeolite synthesized without the use of zeolite seed crystals comprise at least one equivalent composite building unit of zeolite;
- wherein the reacting step occurs without the use of an organic structure-directing agent;
- wherein the zeolite produced is beta zeolite;
- wherein the gel has a composition of:
- SiO2/Al2O3=12 to 20,
- Na2O/SiO2=0.1 to 0.25,
- H2O/SiO2=10 to 25,
- and wherein an amount of the zeolite seed crystals is 1 weight % to 20 weight % with respect to the silica component included in the gel.
Dependencies are inferred from the claim text.