以生物质木粉为原料,采用炭化.磺化法制备了炭基固体酸催化剂,并用于油酸与甲醇的酯化反应,考察了制备条件对炭基固体酸催化剂活性的影响.采用X射线衍射、红外光谱、热重分析、高分辨透射电子显微镜及元素分析等手段对催化剂进行了表征.结果表明,由生物质木粉制备的炭基固体酸催化剂具有较高催化酯化反应活性,在400℃下炭化0.5h,135℃下磺化1h制备的炭基固体酸催化剂在精馏分水连续酯化装置中催化油酸与甲醇的酯化反应2h时,酯化转化率达到96%.采用炭化-磺化法制备的生物质炭基固体酸催化剂具有蠕虫状的无序乱层炭结构,磺酸基(-SO_3H)含量高达13.25%,并且在220℃以下时具有良好的热稳定性.
A carbon-based solid acid catalyst was prepared by a carbonization-sulphonation method from natural biomass wooden powder.The esterification of oleic acid and methanol Was taken as the model reaction to investigate the impact of preparation parameters on the catalyst activity.X-ray diffraction,Fourier transform infrared spectroscopy,Thermogravimetric analysis,high-resolution transmission electron microscopy,and elemental analysis were used to characterize the catalyst.The results showed that the carbon-based solid acid catalyst prepared under the optimal conditions of carbonization at 400℃ for 0.5 h and then sulphonation at 135℃ for 1 h exhibited higher catalytic activity.The conversion of oleic acid reached 96% after reaction for 2 h in an equipment of continuous esterification、With a rectifying colunln for removing water from the system.The biomass carbon-based solid acid catalyst had turbostratic carbon structure.and the sulfuric acid group(-SO_3H)content reached 13.25%.The catalyst showed considerable heat stability below 220℃.
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