低碳化学与化工2025，Vol.50Issue(8)：44-53,10.DOI:10.12434/j.issn.2097-2547.20250170
煅烧钛铁矿催化松木屑热解油提质研究
Study on catalytic upgrading of pine sawdust pyrolysis oil by calcined ilmenite
摘要
Abstract
In response to the problems of high oxygen content and poor quality of biomass pyrolysis oil,rapid pyrolysis of pine sawdust and the upgrading of the pyrolysis oil with calcined ilmenite as catalyst were studied in a free-fall reactor and it in tandem with a fixed-bed reactor respectively.The effects of pyrolysis temperatures,upgrading temperatures,catalyst mass to biomass feed rate ratios(τ,g/(g·min-1))and different calcination temperatures of ilmenite on the pyrolysis oil yields and qualities were investigated.The results show that the total pyrolysis oil yield and light oil yield both reach their maximum values at the pyrolysis temperature of 550℃.With the ilmenite calcined at 600℃as catalyst,under the upgrading temperature of 550℃and τ of 20 g/(g·min-1),the pyrolysis oil quality is significantly improved.The relative hydrocarbon content in the light oil reaches to 38.7%,while that from the blank test(with quartz sand as bed material)is only 11.1%.Increasing the calcination temperatures of ilmenite allows for an increase of light oil yields and improvement of pyrolysis oil quality.However,the excessive calcination temperatures significantly reduce the light oil yields(13.1%).The ilmenite calcined at 600℃exhibits the best catalytic upgrading performance,achieving maximum light oil yield and enrichment hydrocarbon compounds.Structure-performance relationships of structural changes and upgrading performances of calcined ilmenite were investigated by XRD,N2 adsorption/desorption,XPS and NH3-TPD.The results show that ilmenite calcined at 600℃has the maximum specific surface area and the relative contents of surface Fe3+and lattice oxygen.Fe3+species are reduced in the reaction and release coordination oxygen,forming abundant oxygen vacancies.Lattice oxygen and oxygen vacancies separately act as oxygen donors and active sites in the deoxidation reaction of pyrolysis oil,achieving efficient deoxidation through the oxidation-reduction cycle.Additionally,increasing the calcination temperature also promotes the formation of strong acid sites on the surface of calcined ilmenite,further enhancing the cracking and deoxidation of pyrolysis oil.However,the excessive strong acid sites will lead to over-cracking of pyrolysis oil,reducing the light oil yields.关键词
生物质/快速热解/热解油/催化提质/钛铁矿Key words
biomass/fast pyrolysis/pyrolysis oil/catalytic upgrading/ilmenite分类
能源科技引用本文复制引用
邢莹莹,李扬,徐绍平,张俊旺,杜利军,肖亚辉..煅烧钛铁矿催化松木屑热解油提质研究[J].低碳化学与化工,2025,50(8):44-53,10.基金项目
国家自然科学基金青年科学基金(5220061351). （5220061351）
