改性ZSM-5催化热解生物质和低密度聚乙烯实验研究  

Study on catalytic pyrolysis of biomass and low-density polyethylene by modified ZSM-5

作　　者：周国强[1] 姚维坤[2] 李剑[1] 王玉珏[1] 

机构地区：[1]清华大学环境学院,北京100084 [2]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《可再生能源》2015年第3期435-441,共7页Renewable Energy Resources

基　　金：国家科技重大专项(2012ZX07301-005);国家科技支撑计划(2010BAC66B03-05)

摘　　要：通过碱处理和浸渍Zn制备了介孔双功能Zn/ZSM-5分子筛,在Pyroprobe 5200分析热解仪上研究对榉木和低密度聚乙烯(LDPE)共催化热解反应的催化性能。采用X射线衍射,N2-吸附脱附和吡啶红外等方法对催化剂的结构和酸性进行了表征。实验结果表明:ZSM-5分子筛经过改性之后,B酸酸量下降,L酸酸量上升。在榉木和低密度聚乙烯共催化快速热解中,改性分子筛显著提高了石油化学品的产率。与传统ZSM-5相比,介孔Zn/ZSM-5将共热解产物中高附加值单环芳烃和烯烃的产率提高了24.3%,同时抑制了多环芳烃的产生。这一结果表明,在生物质和LDPE共催化快速热解中,浸渍Zn和碱处理复合改性ZSM-5分子筛有利于提高转化效率和优化产物分布。Mesoporous bifunctional Zn/ZSM-5 zeolites were prepared with alkali treatment and impregnation of Zn.The catalytic properties on catalytic co-pyrolysis of biomass and low-density polyethylene were investigated in the Pyroprobe 5200 analytical pyrolyzer.X ray diffraction,N2-adsorption/desorption and Pyridine-IR were used to characterize the structure and acidity of catalysts.The results showed Bronsted acid of the catalyst decreased but Lewis acid increased after ZSM-5 zeolite was modified.This modification considerably increased the yield of petrochemical production in catalytic fast co-pryolysis of biomass and low-density polyethylene mixtures.Compared with the conventional ZSM-5,the mesoporous Zn/ZSM-5 increased the yields of valuable monoaromatic hydrocarbons and olefins by 24.3% and decreased the undesirable polyaromatic hydrocarbons by 50.8%in catalytic fast co-pryolysis.The results indicated that controlled desilication and Zn impregnation of ZSM-5 strictly had a beneficial effect on improving the conversion efficiency and optimizing production distribution in catalytic fast co-pryolysis of biomass and plastics.

关 键 词：碱处理 Zn改性 ZSM-5分子筛 生物质 低密度聚乙烯 共热解 

分 类 号：TK6[动力工程及工程热物理—生物能] S216.2[农业科学—农业机械化工程]