Waste biomass-supported magnetic solid acids have particular advantages in catalyst separation.First,a novel magnetic carbonaceous catalyst was synthesized from waste garlic peel(GP)via in situ impregnation before con...Waste biomass-supported magnetic solid acids have particular advantages in catalyst separation.First,a novel magnetic carbonaceous catalyst was synthesized from waste garlic peel(GP)via in situ impregnation before conducting carbonization at 450–600°C and sulfonation at 105°C.The physical and chemical properties of the synthesized catalysts were characterized.It was found that the magnetism of the catalyst increased with the carbonization temperature.The optimized catalyst,carbonized at 600℃(C600-S),possessed an excellent magnetization value of 12.5 emu/g,with a specific surface area of 175.1 m^(2)/g,a pore volume of 0.16 cm^(3)/g,and an acidic property of 0.74 mmol/g-SO3H density.By optimizing the esterification conditions to produce biodiesel,an oleic acid conversion of 94.5%was achieved at w(catalyst dosage)=10%(w is mass fraction),a molar ratio of n(methanol):n(oleic acid)=10:1(n is the amount of substance),and a reaction for 4 h at 90℃.Further,for catalyst regeneration,it was found that sulfuric acid treatment was more effective for improving the esterification activity than solvent washing,with which a conversion of more than 76%was achieved after the third run.展开更多
基金The Natural Science Foundation of Shandong Province,China(Grant Nos.ZR2020QE210 and ZR2021QE066)the Undergraduate Training Program for Innovation and Entrepreneurship Program of Shandong Province(2021).
文摘Waste biomass-supported magnetic solid acids have particular advantages in catalyst separation.First,a novel magnetic carbonaceous catalyst was synthesized from waste garlic peel(GP)via in situ impregnation before conducting carbonization at 450–600°C and sulfonation at 105°C.The physical and chemical properties of the synthesized catalysts were characterized.It was found that the magnetism of the catalyst increased with the carbonization temperature.The optimized catalyst,carbonized at 600℃(C600-S),possessed an excellent magnetization value of 12.5 emu/g,with a specific surface area of 175.1 m^(2)/g,a pore volume of 0.16 cm^(3)/g,and an acidic property of 0.74 mmol/g-SO3H density.By optimizing the esterification conditions to produce biodiesel,an oleic acid conversion of 94.5%was achieved at w(catalyst dosage)=10%(w is mass fraction),a molar ratio of n(methanol):n(oleic acid)=10:1(n is the amount of substance),and a reaction for 4 h at 90℃.Further,for catalyst regeneration,it was found that sulfuric acid treatment was more effective for improving the esterification activity than solvent washing,with which a conversion of more than 76%was achieved after the third run.
