亚/超临界乙醇与分子筛催化液化玉米秆的研究  

REACTION MECHANISM OF CORNSTALK IN SUB-AND SUPER-CRITICAL ETHANOL WITH MOLECULAR SIEVES CATALYST

作　　者：郑朝阳[1] 解新安[1] 郑璐丝[1] 陶红秀[1] 李雁[1] 

机构地区：[1]华南农业大学食品学院,广州510641

出　　处：《太阳能学报》2013年第4期696-702,共7页Acta Energiae Solaris Sinica

基　　金：广东省科技计划国际合作项目(2009B050700037);国家自然科学基金(21176097)

摘　　要：在反应温度260～320℃、乙醇用量0～140mL条件下,考察不同液化条件及分子筛催化剂用量对液化产物分布的影响,结合液化产物GC/MS分析,研究亚/超临界乙醇与分子筛催化液化玉米秆的反应机理。结果表明:反应温度升高,生物油和气体收率显著增加,温度大于300℃时,以生物油的二次裂解反应为主;乙醇具有传热、溶解及提供自由基的作用,能够重整生物油组成;分子筛催化剂的均匀微孔结构及酸性催化反应向轻油形成方向进行,增加反应速度与强度,与无催化剂试验相比,轻油得率增加6.01%。The effect of different liquefaction condition and molecular sieve catalyst dosage on the products distribu-tion under reaction temperature of 260-320℃ and ethanol usage of 0-140mL was discussed, and reaction mecha- nism for corn stalk in sub-and super-critical ethanol with or without molecular sieve catalyst was researched combi-ning GC/MS analysis of liquefaction products. The results show that the yields of bio-oil and gases rise significantly with the increasing of temperature, when temperature was over 300℃, the main reaction was the secondary pyrolysis of bio-oil. The ethanol possesses the function of transferring heat, dissolving, providing free radicals, and can reform the constituent of bio-oil. The uniform tiny hole structure of molecular sieve catalyst and acidity catalyst reaction will promote the formation of water soluble organics, and increase the reaction rate and intensity. Comparing with the liquefaction without catalyst, the yield of water soluble organics was obtained with the increment of 6.01%.

关 键 词：亚 超临界乙醇 分子筛 催化液化 玉米秆 反应机理 

分 类 号：TK6[动力工程及工程热物理—生物能]