金属改性P/HZSM-5分子筛催化乙醇芳构化  

Aromatization of Ethanol over Metal Modified P/HZSM-5 Zeolite

作　　者：张少龙[1] 李斌[1] 张飞跃[1] 马丽[1] 韩艳华[1] 范闽光[1] 

机构地区：[1]广西大学化学化工学院,南宁530004

出　　处：《物理化学学报》2011年第6期1501-1508,共8页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20763001);广西省自然科学基金(0640004)资助项目~~

摘　　要：以P/HZSM-5分子筛为基础,通过浸渍法制备了Cr、Co、Cu、Zn等金属改性的M-P/HZSM-5分子筛.采用X射线衍射(XRD),比表面积(BET)和氨气程序升温(NH3-TPD)等方法对其进行了表征,并考察了其催化乙醇芳构化的活性.结果表明,改性后的ZSM-5分子筛保持原有的骨架结构,但比表面积降低,酸性分布发生变化;Cu-P/HZSM-5分子筛有较高催化活性.P和Cu的负载量分别为3%和5%,先浸渍P再浸渍Cu,反应温度400°C,质量空速(WHSV)为1.0h-1时轻质芳烃(BTX)收率可达到57.6%.A series of P/HZSM-5 zeolites modified with different metals （Cr, Co, Cu, Zn） were prepared by impregnation. The physicochemical features of the M-P/HZSM-5 catalysts were characterized by X-ray diffraction （XRD）, BET surface area measurements, and temperature programmed desorption of ammonia （NH3-TPD）. We investigated the catalytic activity upon the aromatization of ethanol. The results showed that the framework of the modified zeolites was retained while the specific surface area decreased and the distribution of the acid sites changed greatly. Cu-P/HZSM-5 gave excellent catalytic activity. When the P loading and the Cu loading were 3% and 5% on the HZSM-5 zeolites, respectively, P was modified first and then Cu, the aromatization of ethanol over the 5%Cu-3%P/HZSM-5 zeolite achieved 57.6% with a total light aromatic hydrocarbons （BTX） yield at 400 °C and a weight hourly space velocity （WHSV） of 1.0 h-1.

关 键 词：乙醇 芳构化 轻质芳烃 P/HZSM-5分子筛 

分 类 号：TQ223.122[化学工程—有机化工]