科研之友
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摘要
Based on the investigation of factors influencing the hydrothermal stability of natural Stilbite (CXN) zeolite, the relationship between the steaming temperature and coordinations of Al and Si in the framework of NH4-CXN zeolite has been investigated in detail by Al-27 & Si-29 MAS NMR characterizations, which indicate that both the framework SiO2/Al2O3 ratios and Si(OH) contents of the zeolite increase with the steaming temperature rising, and 21.3 of the framework SiO2/Al2O3 ratio for the zeolite was obtained by steam treatment at 750 degrees C for 3 h. NH3-TPD shows that the total acid amount of the zeolite decreases with the steaming temperature rising. Nitrogen adsorption data prove that non-framework aluminum obviously blocks part of the zeolite channels and some mesopores appear at the same time.
