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Importance of oxygen-containing functionalities and pore structures of biochar in catalyzing pyrolysis of homologous poplar

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Chinese Journal of Chemical Engineering 2024年第1期65卷 200-211页

作者： Li Qiu Chao Li Shu Zhang Shuang Wang Bin Li Zhenhua Cui Yonggui Tang Obid Tursunov Xun Hu School of Material Science and Engineering University of JinanJinan 250022China Joint International Research Laboratory of Biomass Energy and Materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China Shandong BASAN Graphite New Material Plant Zibo 255311China Department of Power Supply and Renewable Energy Sources National Research University TIIAMETashkent 100000Uzbekistan

Biochar and bio-oil are produced simultaneously in one pyrolysis process,and they inevitably contact and may interact,influencing the composition of bio-oil and modifying the structure of *** this sense,biochar is an inherent catalyst for *** this study,in order to investigate the influence of functionalities and pore structures of biochar on its capability for catalyzing the conversion of homologous volatiles in bio-oil,three char catalysts(600C,800C,and 800AC)produced via pyrolysis of poplar wood at 600 or 800℃or activated at 800℃,were used for catalyzing pyrolysis of homologous poplar wood at 600℃,*** results indicated that the 600C catalyst was more active than 800C and 800AC for catalyzing cracking of volatiles to form more gas(yield increase by 40.2%)and aromatization of volatiles to form more light or heavy phenolics,due to its abundant oxygen-containing functionalities acting as active *** developed pores of the 800AC showed no such catalytic effect but could trap some volatiles and allow their further conversion via sufficient ***,the interaction with the volatiles consumed oxygen on 600C(decrease by 50%),enhancing the aromatic degree and increasing thermal *** dominance of deposition of carbonaceous material of a very aromatic nature over 800C and 800AC resulted in net weight gain and blocked micropores but formed additional *** in situ diffuse reflectance infrared Fourier transform spectroscopy characterization of the catalytic pyrolysis indicated superior activity of 600C for removal of -OH,while conversion of the intermediates bearing C=O was enhanced over all the char catalysts.

关键词： Poplar wood Catalytic pyrolysis char catalyst Volatile-char interaction Bio-oil

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In-chamber thermocatalytic tar cracking and syngas reforming using char-supported NiO catalyst in an updraft biomass gasifier

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International Journal of Agricultural and Biological Engineering 2014年第6期7卷 91-97页

作者： Arthur M.James R Wenqiao Yuan Michael D.Boyette Donghai Wang Ajay Kumar Department of Biological and Agricultural Engineering North Carolina State UniversityRaleighNC 27695-7625USA Department of Biological and Agricultural Engineering Kansas State UniversityManhattanKS 66506-2906USA Department of Biosystems and Agricultural Engineering Oklahoma State UniversityStillwaterOK74078-6016USA

The objective of this study was to evaluate the performance of an in-chamber tar cracking and syngas reforming *** unit was composed of a two-stage tubular reactor placed within the combustion zone of an updraft biomass *** generated in the exothermic combustion reactions of biomass gasification drove tar cracking and syngas reforming in the tubes,eliminating the need of external *** performance of the unit was evaluated using char-supported NiO catalysts and was found to be very effective in tar removal and syngas composition enhancement.A tar removal rate of 95% was achieved at 0.3 s residence time and 10%nickel *** condition also gave syngas high-heating value increment of 36%(to 7.3 MJ/m^(3)).The effect of gas residence time and Ni loading on tar removal and syngas composition of the unit was also *** residence of 0.2-0.3 s and Ni loading of 5%-10% were found appropriate to produce clean syngas with tar content appropriate for industrial applications(<0.6 g/m^(3))in an updraft biomass gasifier without external heating.

关键词： biomass gasification tar cracking syngas reforming nickel catalyst char catalyst

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