Study On Catalytic Conversion Of Cellulose, Hemicellulose And Their Derivative For Liquid Alkane Production

Increasingly serious environmental problems force people to research and develop renewable energy. Biomass is the most abundant renewable energy on the earth. Agricultural and forestry resources contain a large number of lignocellulose. Lignocellulose can be converted into biofuels and high valuable chemicals under the effect of catalysts, hence it can remit the environment problems and energe shortage. Recently, the technology of biomass conversion draw wide attention of scholars both at home and abroad. With the development of science and technology, biomass energy shows good development potential.In this study, a conversion technology of biomass and its derivative to produce liquid alkane was investigated. The experiments are as follows:1.The research of produce liquid alkane from saccharidesGlucose and sorbitol were converted into liquid alkane in a biphasic system. Due to the research, this reaction process contained multistep dehydration reaction. The dehydration reaction was the control step of the conversion of saccharides. Through the experiments, the relative better reaction conditions were determined:the dosage of sorbitol was 0.1g, the dosage of Ir-ReOx/SiO2 was 0.03g, the dosage of HZSM-5 was 0.03g, reaction temperature (T) was 170℃, the reaction hydrogen pressure was 7MPa. Under this condition of the reaction for 24 hours, the yield of hexane was 18%.2. The research of produce liquid alkane from biomass strawIn the reaction process of the conversion of corn stalk, the corn stalk should be hydrolyzed into monosaccharide, then the hydrogenation reaction and dehydration reaction can be conducted. We chose copolymerization of p-toluenesulfonic acid to hydrolyze the com stalk. We gained saccharide after the hydrolysis reaction, and the saccharide were converted into liquid alkane in the biphasic system finally. Through the experiments, the relative better reaction conditions were determined:the dosage of corn stalk was 0.1 g, the dosage of copolymerization of p-toluenesulfonic acid was 0.05g, the dosage of Ir-ReOx/SiO2 was 0.03g, the dosage of HZSM-5 was 0.03g, reaction temperature (T) was 170℃, the reaction hydrogen pressure was 7MPa. Under this condition of the reaction for 24 hours, the yield of alkane was 8.3%.3.The research of produce liquid alkane from furfuralThe production of liquid alkane from furfural was an important utilization way of biomass resource. The reaction product 4-(2-Furyl)-3-buten-2-one of furfural and acetone was converted into long chain alkane octane in the biphasic system. There were hydrogenation reaction and dehydration reaction in the reaction process. Through the experiments, the relative better reaction conditions were determined: reaction temperature (T) was 250℃, the dosage of Ir-ReOx/SiO2 was 0.06g, the dosage of HZSM-5 was 0.06g, the reaction hydrogen pressure was 7MPa. Under this condition of the reaction for 9 hours, the yield of octane was 11.5%.Experimental results show that the biphasic system can convert saccharides, furfural and biomass into liquid alkane. Substrates were converted into liquid alkane in the biphasic system after hydrolysis reaction, hydrogenation reaction and dehyration reaction. This realized effective transformation of biomass.