In order to study the effect of minerals on biomass pyrolysis, experiments on pyrolysis of corn straw with different pretreatment methods were performed by using a thermogravimetric analyzer（TGA） coupled with a Four...In order to study the effect of minerals on biomass pyrolysis, experiments on pyrolysis of corn straw with different pretreatment methods were performed by using a thermogravimetric analyzer（TGA） coupled with a Fourier transform infrared （FTIR） spectrometer. The pretreatment methods included water washing and acid washing. The experimental results show that acid washing can remove almost all K^＋ and 78% of Ca^2＋ , while water washing only removes most of K ^＋. The existence of K^＋ and Ca^2＋ obviously favors the formation of compounds containing carbonyl groups and CO2 , but it will decrease the yields of compounds containing C-O-C groups. However, the formation of H2O, CO and CH4 are slightly affected by the removal of inorganic ions. With regard to the structure of the metal ions-adsorbed cellulose characterized by IR analysis, it can be considered that there is an ＂ion force＂ between metal ions and cellulosic biomass. The results of thermal kinetic analysis show that this force can make the reaction activation energy of the biomass pyrolysis decrease. A new mechanism is proposed for explaining the effect of inorganic ions on cellulose pyrolysis.展开更多
In order to solve the problem of lignocellulose degraded speedily and efficiently in anaerobic digestion,the thermo-chemical pretreatment was applied to enhance biogas production from corn stover.Corn stover was therm...In order to solve the problem of lignocellulose degraded speedily and efficiently in anaerobic digestion,the thermo-chemical pretreatment was applied to enhance biogas production from corn stover.Corn stover was thermo-chemical pretreated with a fluidized bed pyrolysis reactor at 180℃,200℃ and 220℃,respectively.Lignin degradations during pretreatment were 15.07%,32.57% and 33.31%,respectively.The Scanning Electron Microscope(SEM)images and Fourier Transform Infrared Spectroscopy(FTIR)spectra confirm that the thermo-chemical pretreatment can change the structure of corn stover and make lignin content decrease.The thermo-chemical pretreated corn stover was digested using a 2-L fermentation reactor.Experimental results showed thermo-chemical pretreatment could improve biodegradability and enhance biogas production.The highest total biogas production was 23319 mL for 20 d which was 10.0% higher than that of the untreated corn stover.展开更多
基金Supported by the National High Technology Research and Development Program of China(No. 2003AA514023) and the Na-tional Basic Research Program of China(No. 2004CB719700)
文摘In order to study the effect of minerals on biomass pyrolysis, experiments on pyrolysis of corn straw with different pretreatment methods were performed by using a thermogravimetric analyzer（TGA） coupled with a Fourier transform infrared （FTIR） spectrometer. The pretreatment methods included water washing and acid washing. The experimental results show that acid washing can remove almost all K^＋ and 78% of Ca^2＋ , while water washing only removes most of K ^＋. The existence of K^＋ and Ca^2＋ obviously favors the formation of compounds containing carbonyl groups and CO2 , but it will decrease the yields of compounds containing C-O-C groups. However, the formation of H2O, CO and CH4 are slightly affected by the removal of inorganic ions. With regard to the structure of the metal ions-adsorbed cellulose characterized by IR analysis, it can be considered that there is an ＂ion force＂ between metal ions and cellulosic biomass. The results of thermal kinetic analysis show that this force can make the reaction activation energy of the biomass pyrolysis decrease. A new mechanism is proposed for explaining the effect of inorganic ions on cellulose pyrolysis.
基金the National Natural Science Foundation of China(Grant No.51276103)the National High-tech R&D Program of China(Grant NO.2012AA101808)for financial support.
文摘In order to solve the problem of lignocellulose degraded speedily and efficiently in anaerobic digestion,the thermo-chemical pretreatment was applied to enhance biogas production from corn stover.Corn stover was thermo-chemical pretreated with a fluidized bed pyrolysis reactor at 180℃,200℃ and 220℃,respectively.Lignin degradations during pretreatment were 15.07%,32.57% and 33.31%,respectively.The Scanning Electron Microscope(SEM)images and Fourier Transform Infrared Spectroscopy(FTIR)spectra confirm that the thermo-chemical pretreatment can change the structure of corn stover and make lignin content decrease.The thermo-chemical pretreated corn stover was digested using a 2-L fermentation reactor.Experimental results showed thermo-chemical pretreatment could improve biodegradability and enhance biogas production.The highest total biogas production was 23319 mL for 20 d which was 10.0% higher than that of the untreated corn stover.
