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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%。
Effects of different liquefaction conditions and the amount of zeolite catalyst on the distribution of liquefaction products were investigated under the conditions of reaction temperature of 260 ~ 320 ℃ and ethanol dosage of 0 ~ 140mL. Combined with the analysis of liquefied products by GC / MS, the effects of subcritical ethanol and molecular sieve on liquefaction of corn Stalk reaction mechanism. The results showed that the reaction temperature increased, the yield of bio-oil and gas increased significantly. When the temperature was higher than 300 ℃, the secondary cracking reaction of bio-oil was the main reaction. Ethanol had the function of heat transfer, dissolution and free radicals, The uniform micropore structure of the zeolite catalyst and the acidic catalytic reaction proceeded toward the formation of light oil, increasing the reaction rate and strength. Compared with the catalyst-free test, the yield of light oil increased by 6.01%.