Add time:08/09/2019         Source:sciencedirect.com

Isomorphous substitution of 3- and 4-valent heteroelements for Si is a practical approach to develop a zeolite catalyst with high activity and selectivity. Different nature of incorporated heteroatoms within the framework of the host zeolites makes the crystallization process challenging and time-consuming. Herein, we developed a practical approach to synthesize a set of heteroelement-substituted chabazites in proton form (M-CHA[H], M = B, Al, Ga, and Ti) using the pure silica CHA (Si-CHA) as the crystal growth seeds. The time required to obtain highly crystalline M-CHA[H] was significantly reduced in comparison with existing procedures. The incorporated heteroatoms were proved to be located in the framework of CHA using FTIR and UV–Vis spectroscopy. Thus, the proposed approach has been demonstrated as a facile and fast way to synthesize the isomorphously substituted CHA in proton form.

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