Abstract
The influence of synthesis conditions such as crystallization time, temperature and gel composition on crystallization of zeolite Beta was studied. Optimal temperature for the synthesis was 170 °C. A crystallization time from 24 to 36 h and 25 and 70 SiO2/Al2O3 ratio in the synthesis gel were used. In this way, three pure zeolite Beta samples were obtained under hydrothermal conditions. Change of these conditions led to zeolites with different Si/Al ratio, with one composition with low SiO2/Al2O3 ratio (20 < Si/Al < 15) in the final product. The materials were characterized by X ray diffraction, elemental analysis, thermal analysis, N2 physisorption, 27Al solid-state NMR, ammonia temperature programmed desorption, and infrared spectroscopy of adsorbed pyridine. 27Al MAS-NMR measurements showed no significant differences in the proportion of tetrahedral and octahedral aluminum. Hydrocracking catalysts were prepared from the calcined zeolites. The evaluation of these catalysts in vacuum gasoil hydrocracking showed that textural properties such as mesopore volume and effects of solvation in zeolite voids have an impact on selectivity towards gasoline and middle distillates.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
