Characterization and cracking performance of zirconium-modified Y zeolite

• Main Authors: Shanqing Yu, Jiasong Yan, Wei Lin, Jiexiao Zhang, Jun Long
• Format: Article
• Language: English
• Published: Elsevier 2021-01-01
• Series: Catalysis Communications
• Subjects: Zirconium; Y zeolite; Stability; Acidity; Catalytic cracking
• Online Access: http://www.sciencedirect.com/science/article/pii/S1566736720302478

Zirconium-modified Y zeolites (ZrUSY) were prepared by impregnation of the zeolite with anhydrous-ethanol and aqueous ion exchange methods. The ZrUSY samples were characterized by powder X-ray diffraction, nitrogen physisorption, and Fourier transform infrared spectroscopy. The results indicated that ZrUSY prepared by the impregnation with anhydrous-ethanol method showed higher crystallinity, specific surface area and hydrothermal stability. The incorporation of Zr into other Y zeolites leads to an increase of the Brønsted acid site concentration and a decrease of the Lewis acid site concentration compared to the ultra-stable Y zeolite (USY). The ZrUSY was much more favorable towards heavy oil FCC conversion with decreasing coke yield and improving olefins selectivity.