The solid acid catalyst SO2 -4 /Fe2 O3 was prepared by direct calcining FeSO4 ?7H2 O ,and characterized by temperature programmed desorption of NH3 (NH3‐TPD) .With industrial alcohol as solvent ,the catalytic activity of SO2 -4 /Fe2O3 catalyst in liquefaction of Enteromorpha prolifera (E. p roli f era) was investigated . Results showed that both calcining temperature and time had significant influences on the surface acid strength and acid amount of SO2 -4 /Fe2O3 . The SO2 -4 /Fe2 O3 obtained by calcining FeSO4 ?7H2 O for 5 h at 500℃ had the best catalytic activity in E .prolifera thermal liquefaction to produce bio‐oil .Compared with the E. prolifera thermal liquefaction without catalyst ,the bio‐oil yield increased from 44.8% to 48.5% ,while residue yield decreased from 40.7% to 35.0% .The bio‐oil from E . prolifera thermal liquefaction contained a large amount of monosaccharides and ethyl ester compounds .In the presence of SO2 -4 /Fe2 O3 ,the content of monosaccharides decreased , w hile the content of ethyl ester compounds increased significantly ,and ,also alkanes were formed .

直接焙烧FeSO4·7H2O制备固体酸SO2-4/Fe2O3催化剂,并对其进行NH3程序升温脱附表征。以工业乙醇为溶剂,研究了该催化剂对浒苔热液化生产生物油的催化作用。结果表明,焙烧温度和焙烧时间对固体酸SO2-4/Fe2O3催化剂表面的酸量和酸强度有显著影响。500℃焙烧5h制备的SO2-4/Fe2O3催化效果最好,可以显著提高浒苔热液化生物油产率;与未加催化剂相比,生物油产率从44.8%提高至48.5%、残渣产率从40.7%降至35.0%。浒苔热液化所得生物油中含有较多的单糖和乙酯类化合物;加入固体酸SO2-4/Fe2O3催化剂后,所得生物油中单糖类物质含量降低,乙酯类化合物含量显著增加,且有烷烃类物质形成。

In this paper,marine macroalgae Enteromorpha prolifera was converted to bio-oil by hydrothermal liquefaction,the influences of reaction temperature and reaction time were studied.The authors employed scanning electron microscopy(SEM) and Fourier transform infrared spectroscopy(FT-IR) to analyze corresponding residues which were obtained at different reaction temperatures and times,and studied the hydrothermal liquefaction process of Enteromorpha prolifera.The results showed that reaction temperature and reaction time significantly affected hydrothermal liquefaction and the bio-oil yield.The highest bio-oil yield of 22.3% was obtained at 300 ℃ for 30min.Enteromorpha prolifera was decomposed partly at 200 ℃.Organic matters of Enteromorpha prolifera were decomposed completely at 300 ℃ for 60 min.The major components of the residue were SiO2,CaSO4 and amorphous carbon.