介质阻挡放电反应条件下生物油加氢提质机理分析

Mechanism analysis of bio-oil hydrogenation under condition of dielectric barrier discharge reaction

介质阻挡放电反应技术是实现温和反应条件下热敏性生物油加氢提质的有效途径.为解析介质阻挡放电条件下生物油各组分加氢反应途径及机理,在此前研究的基础上,以模型化合物配制的模拟生物油为研究对象进行了加氢试验及理论研究.结果表明:丁酸与丁醇主要通过酯化生成丁酸丁酯,羟基丙酮的加氢液相产物主要为异丁醛,糠醛主要通过加氢饱和生成糠醇,愈创木酚主要通过甲基断裂生成邻苯二酚以及进一步加氢得到环己烯;模型化合物丁酸、丁醇、糠醛、羟基丙酮、愈创木酚、乙酸乙酯和环己烷的转化率依次为82.86%、85.95%、82.05%、83.79%、51.70%、68.54%和13.03%,导致生物油腐蚀性及热稳定较差的酸类、醛类、酮类组分表现出较高的反应活性.

Dielectric barrier discharge reaction technology is an effective way to achieve the hydrogenation and upgrading of thermosensitive bio-oil under mild reaction conditions.To analyze the hydrogenation reaction pathway and mechanism of each component of bio-oil under the condition of dielectric barrier discharge,hydrogenation experiments and theoretical investigation on the simulated bio-oil prepared by model compounds were conducted based on the previous studies.The results show that butyric acid and butanol are mainly esterified to produce butyl butyrate,and the hydrogenation liquid product of hydroxyl acetone is mainly isobutyl aldehyde.Furfural is mainly saturated by hydrogenation to produce furfuryl alcohol,and the guaiacol is mainly broken by methyl to produce catechol and further hydrogenation to cyclohexene.The conversion rates of model compounds of butyric acid,butanol,furfural,hydroxyacetone,guaiacol,ethyl acetate and cyclohexane are 82.86%,85.95%,82.05%,83.79%,51.70%,68.54%and 13.03%,respectively.Acid,aldehyde and ketone can lead bio-oil to poor corrosion and thermal stability and show high reactivity.