摘要
为研究分子筛孔道结构和Brnsted(B)酸中心可接近性对噻吩在分子筛中吸附和反应的影响,采用XRD、BET、SEM等方法研究了3种带十二元环孔道的分子筛结构性质,采用NH_3-TPD、Py-IR等技术研究了它们的酸性和B酸可接近性,并以噻吩为探针分子,利用原位红外技术研究了噻吩在分子筛中的吸附和转换。结果表明,HMOR和Hβ分子筛介孔孔径大于HY介孔孔径,而Hβ颗粒尺寸最小。HY拥有最大总酸量,而HMOR拥有以B酸为主的最强酸性。HY的B酸可接近性最差,HMOR和Hβ可接近性相近。噻吩在HY中吸附量最大并以物理吸附为主,而Hβ分子筛的小尺寸晶粒和双十二元环孔道特点对噻吩展现最高B酸催化效果。
In order to study the effects of pore structure and the accessibility of Br nsted acid centers on the adsorption and reaction performance of thiophene over zeolites,three kinds of zeolites with 12-membered ring were characterized by XRD,BET and SEM.The acidity and Br nsted acid sites’accessibility were revealed using the techniques,such as NH 3-TPD,Py-IR.The adsorption and conversion over zeolites were studied by in situ infrared spectroscopy using thiophene as the probe molecule.Results show that the mesopore size of HMOR and Hβzeolites are larger than that of HY zeolite.Especially,the size of Hβzeolite particles is the smallest.HY displays the largest total acid content,while HMOR displays the strongest Br nsted acidity.The accessibility of Br nsted acid sites of HY is worse than that of HMOR and Hβ.HY has the largest adsorption capacity to thiophene by physical adsorption,while Hβexhibits the highest Br nsted acid catalytic activity to thiophene due to its small size and double vertical channels.
作者
莫周胜
秦玉才
裴婷婷
王琳
宋丽娟
MO Zhousheng;QIN Yucai;PEI Tingting;WANG Lin;SONG Lijuan(College of Chemistry&Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,China;Key Laboratory of Petrochemical Catalytic Science and Technology of Liaoning Province,Liaoning Shihua University,Fushun 113001,China;School of Materials Engineering,Liaoning Equipment Manufacturing Vocational and Technical College,Shenyang 110161,China;College of Petrochemical Engineering,Bayin Guoleng Vocational and Technical College,Korla 841000,China)
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2018年第5期1020-1026,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(21376114)资助。
