Acidity Evaluation of Industrially Dealuminated Y Zeolite via Methylcyclohexane Transformation

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

作者机构：College of Chemistry and Chemical EngineeringTaiyuan University of TechnologyTaiyuan 030024 SINOPEC Dalian Research Institute of Petroleum and PetrochemicalsDalian 

出 版 物：《China Petroleum Processing & Petrochemical Technology》 (中国炼油与石油化工（英文版）)

年 卷 期：2021年第23卷第3期

页      面：50-57页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

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) 

主　　题：methylcyclohexane catalytic transformation industrially modified Y zeolite zeolitic acidity strong protonic sites spectroscopic technology 

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 *** 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 *** products of aromatics and isomers,and the yield of cracking products increase with the increase of concentration of strong protonic sites in zeolite ***,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 *** the same reason,it results in the increasing of C_(7)products and alkenes/alkanes ratios in the cracking *** 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).