Investigation on the mechanism of adsorption and desorption behavior in cerium ions modified Y-type zeolite and improved hydrocarbons conversion

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• 作者：Le ZHANG (张 乐)^a ; ^b ; Qiang LI (李 强)^b ; Yucai QIN (秦玉才)^b ; Xiaotong ZHANG (张晓彤)^b ; Xionghou GAO (高雄厚)^c ; Lijuan SONG (宋丽娟)^a ; ^b ; ^{tianhuikele@126.com} ; ^{lsong56@263.net}
• 关键词：catalysis ; Y zeolite ; adsorption model ; GCMC ; rare earth ion species
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：34
• 期：12
• 页码：1221-1227
• 全文大小：2313 K
• 卷排序：34

文摘

Different types of Y zeolites (HY, USY and NaY) containing various amounts of cerium (Ce) were prepared with the method of liquid ion exchange and characterized by X-ray diffraction (XRD), intelligent gravimetric analyzer (IGA), and a molecular simulation technology (grand canonical Monte Carlo simulation, GCMC). A novel calculation method of desorption index (DI) was proposed and the influence of cerium cationic species on the processes of adsorption-desorption of hydrocarbon molecules (n-octane) on the cerium modified Y zeolites (CeY) was studied. The results indicated that Ce ion species played a key role in reducing desorption activation energy of n-octane on Y type zeolites, leading to an improvement of the desorption ability of the CeY and the regulation of the adsorption state of n-octane from aggregation to decentralization. These findings are essential factors for enhancing the product selectivity of light hydrocarbon component and the catalytic activity of rare earth modified Y zeolites (REY) catalysts in fluid catalytic cracking (FCC) process.