摘要
生物质快速热裂解是生物质转化利用的有效途径,但常因是非催化过程,裂解温度高导致生物油成分复杂难控。本实验以ZnCl_(2)为催化剂,研究了木质素、纤维素、玉米芯和松木粉的热解过程,旨在探索原位催化对快速热裂解的强化作用。本实验通过热重曲线拟合,获得了热裂解的活化能;通过快速热裂解实验,研究了催化作用下热解油组成变化。结果表明,ZnCl_(2)催化可显著降低生物质裂解温度,简化生物油组成。在350℃快速热裂解松木粉获得了47%生物油产率,主要成分是纤维素和半纤维素的衍生物。ZnCl_(2)可显著降低纤维素裂解的活化能(由304.78 kJ/mol降低至112.46 kJ/mol),而对木质素的裂解影响不大。裂解后的碳渣在600℃二次碳化可获得性能良好的活性炭,苯酚吸附容量可达165 mg/g。
Fast pyrolysis of biomass is an effective way for biomass conversion and utilization.However,the pyrolysis temperature is usually high because it is a non-catalytic process,resulting in the complicated composition of bio-oil and difficulty to control.Aiming to explore in-situ catalysis in this paper,the fast pyrolysis of lignin,cellulose,corncob and pine wood powder was studied using ZnCl_(2) as the catalyst.The activation energies of non-catalytic pyrolysis and catalytic pyrolysis were obtained based on kinetic fitting of their thermal gravimetric curves.The variation in pyrolysis oil composition was analyzed.It was found that ZnCl_(2) in-situ catalysis could not only significantly reduce the pyrolysis temperature,but also simplify the resultant bio-oil composition.Even under pyrolysis temperature as low as 350℃,fast pyrolysis of pine wood powder could achieve a yield of 47%of bio-oil,which was predominantly composed of the derivatives of cellulose and hemicellulose.ZnCl_(2) in-situ catalysis could significantly decrease the activation energy of cellulose cracking from 304.78 to 112.46 kJ/mol,but has little effect on that of lignin.The carbon residue from ZnCl_(2)-catalyzed pyrolysis was further carbonized at 600℃,affording activated carbon with adsorption capacity of phenol up to 165 mg/g.The research work provides guidance and reference for the development of in-situ catalytic pyrolysis technology with high efficiency.
作者
庞兆斌
王建刚
崔洪友
王景华
PANG Zhao-bin;WANG Jian-gang;CUI Hong-you;WANG Jing-hua(School of Chemistry and Chemical Engineering,Shandong University of Technology,Zibo 255091,China;Shandong Lunan Coal Chemical Research Institute of Engineering and Technology,Zaozhuang University,Zaozhuang 277160,China)
出处
《燃料化学学报（中英文）》
EI
CAS
CSCD
北大核心
2023年第9期1250-1258,共9页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(21978158)资助。
