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NM04.06.16 : Novel Approaches to Remove EFAL (Extra Framework Aluminum) in Commercial USY-Zeolites

5:00 PM–7:00 PM Apr 4, 2018

PCC North, 300 Level, Exhibit Hall C-E

Description
Balasubramanian Vaithilingam1

1, ADNOC Refining Research Center, ADNOC Refining, ADNOC, Abu Dhabi, , United Arab Emirates

Zeolites with low aluminum content (high Si/Al ratio) are more favorable for catalytic applications. Zeolite-Y is the prominent member of zeolite family cannot be directly synthesized with Si/Al ratios over ~2.5. Hence, post-synthetic modification such as hydrothermal dealumination is found to be most feasible way to increase the Si/Al ratio in the framework.1-4 In general, dealumination refers to the removal of aluminum from zeolitic framework by chemical reactions. Most often, the ‘Al’ removed from zeolitic framework will fall into non-framework (extra framework). Due to EFAL species the degree of crystallinity to be reduced in zeolites, which leads to complicated issues on catalytic applications. To avoid this, selective removal of extra framework aluminum (EFAL) is important for various catalytic applications. In this study, a novel approaches has been developed to remove only EFAL species from commercial Zeolite-USY. Various concentration of water glass was added to commercial zeolites and treated at various temperatures (Room Temp to 100 °C) and duration (0-24hrs) to obtain to remove EFAL from the zeolite materials. All the samples were well characterized by XRD, N2 adsorption-desorption measurements, ICP-AES, SEM, TEM, FTIR and NMR. A model catalytic cracking reaction was carried out to evaluate the catalytic properties of the EFAL removed samples.

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