Acidity Evaluation of Industrially Dealuminated Y Zeolite via Methylcyclohexane Transformation  

作　　者：Hou Kaige Qin Bo Han Junjie Du Yanze Ma Jinghong Li Ruifeng 

机构地区：[1]College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024 [2]SINOPEC Dalian Research Institute of Petroleum and Petrochemicals,Dalian

出　　处：《China Petroleum Processing & Petrochemical Technology》2021年第3期50-57,共8页中国炼油与石油化工（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant No.21978192);the SINOPEC Technology Project(No.117009-1);the Shanxi Province Key Innovative Research Team in Science and Technology(No.2014131006).

摘　　要：The catalytic transformation of methylcyclohexane as an accepted probe reaction to evaluate zeolitic acidity(concentration,strength,and accessibility)is employed to study the acidity and the reactivity of three commercial dealuminated Y zeolites(DAY)with different Si/Al ratios and meso/microporosities,with their properties analyzed by N_(2) adsorption/desorption,pyridine-IR,and hydroxyl-IR spectroscopy technologies.The global activity(conversion)is largely dependent on the concentration of the acid sites,and the activity of the protonic sites in terms of turnover frequency(TOF)reflects the accessibility of acid sites.The products of aromatics and isomers,and the yield of cracking products increase with the increase of concentration of strong protonic sites in zeolite micropores.Moreover,the decrease of aromatics with the reduction of the concentration of acid sites and the diffusion length within DAY zeolites are observed due to the decrease of the secondary reaction.For the same reason,it results in the increasing of C_(7)products and alkenes/alkanes ratios in the cracking products.The high i-C_(4)product selectivity is a unique reflection of the high percentage of very strong acid sites,which is characterized by the hydroxyl-IR band at 3600 cm^(-1).

关 键 词：methylcyclohexane catalytic transformation industrially modified Y zeolite zeolitic acidity strong protonic sites spectroscopic technology 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]