刘民

个人信息Personal Information

副教授

博士生导师

硕士生导师

主要任职:Associate Professor

其他任职:系教工党支部书记

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:化工学院

学科:工业催化. 能源化工

办公地点:大连理工大学西校区化工实验楼B421

电子邮箱:lium@dlut.edu.cn

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论文成果

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Role of Acidity in the Ethylation of Coking Benzene with Ethanol over Nanosized HZSM-5

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论文类型:期刊论文

发表时间:2010-01-20

发表刊物:INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录刊物:SCIE、EI、Scopus

卷号:49

期号:2

页面范围:506-514

ISSN号:0888-5885

摘要:Ethylation of coking benzene, the product of coke oven gas, with ethanol over nanosized HZSM-5 zeolites poisoned by 2,6-dimethylpyridine has been investigated in a fixed-bed reactor. Pyridine infrared (Py-IR), amonia temperature programmed desorption (NH(3)-TPD), thermogravimetry (TG), acidity titration with a Hammett indicator, and cyclohexane and it-hexane adsorption were used to characterize the changes in acidity and porosity of the nanosized HZSM-5 zeolites poisoned by 2,6-dimethylpyridine. Conversion and product distribution depend strongly on the degree of catalyst poisoning. The acidity-activity correlation indicates that acid sites with pK(a) < -3.0 are responsible for the ethylation of coking benzene and sites with pK(a) < 2.27 are responsibly for the thiophene conversion. The remaining acid sites, which are not active for the ethylation of coking benzene over the poisoned sample, act as active centers for ethanol dehydration to ethylene. 2,6-Dimethylpyridine not only adsorbs on the strong Bronsted acid sites but blocks the zeolite channels over the poisoned sample.