【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。更多还原

【Abstract】 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.更多还原