In order to evaluate the effects of La-involvement on biomass pyrolysis behaviors and properties of produced biochar, oak sawdust（OS） and corn straw（CS） were employed for thermogravimetric-differential thermogravi...In order to evaluate the effects of La-involvement on biomass pyrolysis behaviors and properties of produced biochar, oak sawdust（OS） and corn straw（CS） were employed for thermogravimetric-differential thermogravimetric（TG-DTG） analysis and producing biochar with/without La-involvement. Results indicated the initial and final temperatures were shifted toward lower temperature as LaCl3 was involved in pyrolysis. Mass loss and average mass loss rate during pyrolysis decreased with La-involvement. The kinetics indicated that the first-order reaction kinetic model well matched the pyrolysis process. As La-involved OS and CS were employed, their apparent activation energies（Ea） were reduced, and their pyrolysis characteristic index（I） were higher comparing with the OS and CS without La-involvement. Based on the produced biochar, the yield and ash content were increased by La-involvement, and the O/C ratio and iodine sorption value（ISV） were also enhanced. Obviously, the loaded LaCl3 could facilitate pyrolysis process, and the produced biochar exhibited a great adsorption potential in aqueous solution. According to the results from FT-IR（Fourier transform infrared spectroscopy） analysis, La in pyrolysis functioned as accelerating lignin decomposition via condensing –OH, breaking aliphatic C–H and aromatic rings on lignin, cutting the links of C-O-C among the monomers in lignocellulose. LaCl3 was finally converted to La2O3 in biochar after pyrolysis.展开更多
基金Project supported by Key R&D Projects of Sichuan Province from the Science&Technology Department of Sichuan Province(2017SZ0028)Program for Changjiang Scholars and Innovative Research Team in University from the Ministry and Education of China(IRT13083)
文摘In order to evaluate the effects of La-involvement on biomass pyrolysis behaviors and properties of produced biochar, oak sawdust（OS） and corn straw（CS） were employed for thermogravimetric-differential thermogravimetric（TG-DTG） analysis and producing biochar with/without La-involvement. Results indicated the initial and final temperatures were shifted toward lower temperature as LaCl3 was involved in pyrolysis. Mass loss and average mass loss rate during pyrolysis decreased with La-involvement. The kinetics indicated that the first-order reaction kinetic model well matched the pyrolysis process. As La-involved OS and CS were employed, their apparent activation energies（Ea） were reduced, and their pyrolysis characteristic index（I） were higher comparing with the OS and CS without La-involvement. Based on the produced biochar, the yield and ash content were increased by La-involvement, and the O/C ratio and iodine sorption value（ISV） were also enhanced. Obviously, the loaded LaCl3 could facilitate pyrolysis process, and the produced biochar exhibited a great adsorption potential in aqueous solution. According to the results from FT-IR（Fourier transform infrared spectroscopy） analysis, La in pyrolysis functioned as accelerating lignin decomposition via condensing –OH, breaking aliphatic C–H and aromatic rings on lignin, cutting the links of C-O-C among the monomers in lignocellulose. LaCl3 was finally converted to La2O3 in biochar after pyrolysis.
基金supported by the National Natural Science Foundation of China(project nos.31901086,31988102,31800397)the National Key Research and Development Program of China(2017YFC0503906).
