Low-temperature synthesis of zeolite from porous silica by hot-water and steam treatment
Chabazite (CHA) zeolite was synthesized at 333 K by soaking porous silica powder, derived from Si alkoxide, in a basic solution. In addition, Linde Type A (LTA) zeolite was synthesized at the same temperature via the steam treatment of porous silica powder. Prior to the above treatment, Na, Al, and a structure-directing agent were impregnated into the silica powder. As a result of soaking, porous silica was almost completely converted to CHA, while steam treatment resulted in a composite material composed of LTA and silica. This result suggested that hydrothermal conditions above the boiling point of water is not necessarily required for the synthesis of zeolite from silica.
KeywordsLow-temperature zeolite synthesis Hot-water treatment Steam treatment Crystal growth Macroporous silica Alkoxide method
This study was supported by JSPS KAKENHI Grant Number 22760578.
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Conflict of interest
The authors declare that they have no conflict of interests.