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Characterization and cracking performance of zirconium-modified Y zeolite
Catalysis Communications ( IF 3.7 ) Pub Date : 2020-09-15 , DOI: 10.1016/j.catcom.2020.106171
Shanqing Yu , Jiasong Yan , Wei Lin , Jiexiao Zhang , Jun Long

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.



中文翻译:

锆改性Y沸石的表征与裂解性能

锆改性的Y沸石(ZrUSY)是通过用无水乙醇和水离子交换方法浸渍沸石而制备的。ZrUSY样品通过粉末X射线衍射,氮物理吸附和傅里叶变换红外光谱进行了表征。结果表明,无水乙醇浸渍法制备的ZrUSY具有较高的结晶度,比表面积和水热稳定性。与超稳定Y沸石(USY)相比,将Zr掺入其他Y沸石中会导致布朗斯台德酸位点浓度增加,而路易斯酸位点浓度会降低。ZrUSY在降低焦炭收率和改善烯烃选择性方面更有利于重油FCC转化。

更新日期:2020-09-22
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