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

• Published in: Journal of rare earths Vol. 34; no. 12; pp. 1221 - 1227
• Main Author: 张乐 李强 秦玉才 张晓彤 高雄厚 宋丽娟
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2016
• Subjects: adsorption model; catalysis; GCMC; rare earth ion species; Y zeolite; Y型分子筛; Y型沸石; 催化裂化催化剂; 分子模拟技术; 吸附-解吸过程; 烃类转化; 离子改性; 行为机制; rare earth ion species; catalysis; GCMC; Y zeolite; adsorption model
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(16)60157-6

Different types of Y zeolites（HY, USY and Na Y） 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（Ce Y） 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 Ce Y 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.