Zeolite Y, with a high SiO2/Al2O3 ratio (SAR), plays an important role in fluidized catalytic cracking processes. However, in situ synthesis of zeolite Y with high SARs remains a challenge because of kinetic limitations. Here, zeolite Y with an SAR of 6.35 is synthesized by a hydroxyl radical assisted route. Density‐functional theory (DFT) calculations suggest that hydroxyl radicals preferentially enhanced the formation of Si‐O‐Si bonds, thus leading to an increased SAR. To further increase the SAR, a dealumination process was carried out using citric acid, with a subsequent second‐step hydrothermal crystallization, giving an SAR of up to 7.5 while maintaining good crystallinity and high product yield. The resultant zeolite Y shows good performance in cumene cracking. Introduced here is a new strategy for synthesizing high SAR zeolite Y, which is widely used in commercial applications.
Y zeolite slurry contains a lot of colloid and pretreatment of Y zeolite slurry could separate Y zeolite nanoparticles and Si sol effectively by alkali solution. These nanoparticles were characterized by scanning electron microcopy, particle size distribution, X-ray diffraction, thermogravimetric analysis, and NH 3 temperature program desorption. After integrating the Y zeolite in fluid catalytic cracking catalyst, performance of the catalyst containing this nano-zeolite was evaluated by cracking the mixed feed of Xinjiang vacuum gas oil and vacuum resin in fixedfluidized-bed reactor. This catalyst is favorable for the production of light oil by catalytic cracking the mixed feed.
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