可再生能源2018，Vol.36Issue(2)：195-202,8.
磷钨酸铯催化工业蔗渣木质素制备酚类化学品
Production of phenols from catalytic conversion of industrial bagasse lignin over cesium-exchanged phosphotungstic acid catalyst
摘要
Abstract
In the present study, industrial bagasse lignin (IBL) was extracted from bagasse soda pulping black liquor by acid precipitation, then production of phenols from IBL over a variety of cesium-exchanged phosphotungstic acid(CsxH3-xPW12O40,x=0~3)catalyst in a hot compressed water–ethanol mixed solvent is examined. It was found that Cs2.5H0.5PW12O40is highly suitable for depolymerization of IBL to phenolic monomers in high yields at 250 °C for 180 min. The chemical structure and contents of liquefaction products were studied in detail,by using the methods of GC-MS and GC,the small molecular products mainly consist of five phenols,i.e. 4-ethyl phenol(8.1%), 4-Vinyl phenol(1.3%), 3-methyl-4-ethyl phenol(1.9%), 4-isopropyl-phenol(3.5%)and 2,6-dimethoxy-phenol(7.8%).The optimal conditions for IBL conversion, including substitution degree of cesium, surface area and pore structure of catalyst, reaction temperature and time, was optimized. The porous carbon supported catalyst gives the higher 4-ethyl phenol yield, while the volume of pore、size of pore and surface area of porous carbon supported Cs2.5H0.5PW12O40/C2 catalysts are 0.340 cm3/g, 5.888 nm and 341.783 m2respectively,the highest porous yield was 12.36%obtained from 350°C for 120 min in ethanol-water (v/v=9/1)mixed solvent.A longer reaction time leads to the formation of polymers due to the re-polymerization reactions. Therefore, the yield of 4-ethyl phenol decreases with the increase of the reaction time after 120 min.关键词
生物质/木质素/多孔炭/酚类化合物/催化/甘蔗渣Key words
biomass/lignin/porous carbon/phenolic compound/catalysis/bagasse分类
能源科技引用本文复制引用
黎演明,吴学众,卢波,杜芳黎,龙思宇,黄华林,唐培朵..磷钨酸铯催化工业蔗渣木质素制备酚类化学品[J].可再生能源,2018,36(2):195-202,8.基金项目
广西国际科技合作项目(15104001-5) （15104001-5）
广西自然科学青年基金项目(2015GXNSFBA139022) （2015GXNSFBA139022）
南宁市科技计划项目(20161020) （20161020）
广西科学院基本科研业务经费(2017YJJ230009,11YJ24SW09). （2017YJJ230009,11YJ24SW09）
