复合离子液体中纤维素的催化分解.pdf

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1、物理化学学~(WuliHuaxueXuebao)MayActaP．一Chim．Sin．2011，27(5)，995—999995[Communication】www．whxb．pku．edu．cn复合离子液体中纤维素的催化分解龙金星郭斌李雪辉王芙蓉王乐夫(华南理工大学化学与化工学院，制浆造纸国家重点实验室，Y-9~t510640)摘要：通过将酸性功能化离子液体与对纤维素具有溶解作用的离子液体进行复合，构建了一类新型的高效催化纤维素分解的体系，并采用热重(TG)分析方法，研究了复合离子液体中纤维素的分解行为．结果表

2、明：复合离子液体中纤维素的分解温度明显降低，溶于离子液体中的纤维素可被酸性离子液体原位催化分解．纤维素的分解温度受离子液体催化剂的酸性及纤维素在复合离子液体中的溶解度影响明显：酸性越强，溶解度越大，纤维素的分解温度越低．关键词：复合离子液体：纤维素：催化分解；热重：酸强度中图分类号：0642CatalyticDecompositionofCelluloseinCooperativeIonicLiquidsLONGJin—XingGUOBinLIXue—HuiWANGFu-RongWANGLe-Fu(Schoolo

3、fChemistryandChemicalEngineering,Pulp＆PaperEngineeringStateKeyLaboratoryofChina,SouthChinaUniversityofTechnology,Guangzhou510640,R．China1Abstract：Cellulose，theabundantandcost-ineffectiveresource，isconsideredtobeaperfectalternativef0rthealeviationofenergycrisi

4、sandenvironmentalpollution．However．mostprocessesforthetreatmentofcellulosearerigorcurrentlyasitisinsolubleinwaterandconventionaIorganicsolventsduetoitsstrongIntraandInter-molecularhydrogenbonds，wherethephaseproblemhampersitsutilizationwidely．Here．webuiltanove

5、IandeffIcientcooperativeionicliquidpairssystemforthelowtemperaturecatalyticconversionofcellulose，whichwasconstructedthroughthecombinationofanacidicionicIiquidcatalystandacellulosesolubleionicliquidsolvent．Thecatalyticdecompositionbehaviorofmicrocrystalcellulo

6、seinthisv~gorouscatalyticsystemwasstudiedintensivelybythermogravimetry(TG)．ResultsshowthatthedecompositiontemperatureofcellulosedecreasesgreatlyinalIcooperativeionicliquidpairs．cellulosedissolvedinionicliquidsolventscanbeinsitucatalyticdecomposedbyacidicionic

7、liquids．Furthermore．thedecompositiontemperatureisdependentontheacidicstrengthoftheionicliquidcatalysts．strongeracidityresultsinaIowerdecompositiontemperatureofthecellulose．Moreoverwefoundthatcellulosecan,bedecomposedatlowertemperaturewhenthejonicliquidwithhig

8、hersolubilityofcellulosejsused．KeyWords：Cooperativeionicliquid；Cellulose；Catalyticdecomposition；Thermogravimetry；Acidicstrength1IntrodUCtionemergenceofglobalwarmingbyexcess—combustionoffo