Removal of Organochlorine from Model Oil Using Mg-Modified ZSM-5 Zeolite:Dechlorination Performance,Regeneration,and Thermodynamics  

作　　者：Cheng Xingyuan Gu Jie Huang Bingtian Bing Liancheng Han Dezhi Wang Guangjian Wang Fang 

机构地区：[1]State Key Laboratory Base for Eco-Chemical Engineering in College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao,Shandong 266042,China

出　　处：《China Petroleum Processing & Petrochemical Technology》2023年第2期24-32,共9页中国炼油与石油化工（英文版）

基　　金：This work was financially supported by the Natural Science Foundation of Shandong Province(ZR2021MB134 and ZR2022MB019);the National Natural Science Foundation of China(22008131);the Talent Fund for Province and Ministry Co-construction Collaborative Innovation Center of Eco-chemical Engineering(STHGYX2220);the Opening Fund of State Key Laboratory of Heavy Oil Processing(SKLOP202002002).

摘　　要：Various metal-modified ZSM-5 zeolite adsorbents prepared by the impregnation method were applied to the removal of organic chlorides from model naphtha.The adsorption performance and regeneration stability were investigated by static adsorption experiments.The morphologies,structural features,and physicochemical properties of the adsorbents were characterized by X-ray diffraction,Brunauer-Emmett-Teller analysis,NH3 temperature-programmed desorption,scanning electron microscopy,transmission electron microscopy,and pyridine adsorption infrared spectroscopy.The Mg/ZSM-5 zeolite adsorbent possessed a relatively high specific surface area and good metal dispersion and exhibited the best dechlorination and regeneration performance.The characterization results revealed that introduction of the metal exerted a significant influence on the acidic properties of the catalyst surface.A decrease in the ratio of Brønsted acidic sites to Lewis acidic sites and an increase in the amount of moderately acidic sites were confirmed to be responsible for the excellent adsorption performance of the Mg-modified ZSM-5 zeolite.Furthermore,the Langmuir adsorption isotherm model was applied to study the adsorption equilibrium and thermodynamics of the Mg/ZSM-5 adsorbent under mild conditions.The results revealed that the removal of 1,2-dichloroethane by the Mg/ZSM-5 adsorbent was endothermic,spontaneous,disordered,and primarily involved physical adsorption.

关 键 词：adsorption dechlorination ZSM-5 zeolite metal modification THERMODYNAMICS 

分 类 号：TE624[石油与天然气工程—油气加工工程] TQ424[化学工程]