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时间:2020-04-21
《Cu基催化剂催化甘油氢解制备丙二醇-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、2014年9月工业催化Sept.2014第22卷第9期INDUSTRIALCATALYSISVo1.22No.9催化帑翩
2、与研究Cu基催化剂催化甘油氢解制备丙二醇鲍涛,王波,江运良,蔡新兴,计伟荣(浙江工业大学化学工程学院,浙江杭州310014)摘要:在间歇釜式反应器中考察cu基催化剂在不同酸性条件下的甘油催化氢解反应性能,采用一A1O、SiO和SiC酸碱性不同的载体研究催化剂催化活性和选择性的影响,结果表明,3种载体的cu基催化剂均对1,2一丙二醇的生成有较高的催化活性和选择性,但只有弱酸性SiO为栽体时生成1,3一丙二醇。研究在底物中添加HSO(B酸)对甘油氢解反应性能
3、的影响,发现质子酸的存在有利于1,3一丙二醇的生成,但易导致副反应发生,使1,2一丙二醇选择性大幅降低。研究用磷钨酸改性的Cu/SiO:催化剂对甘油氢解反应的催化活性的影响,发现磷钨酸的加入有利于甘油氢解为1,3一丙二醇,且酸性越强,越容易发生副反应。随着Cu/HWP/SiO,催化剂焙烧温度的升高,酸性减弱,丙二醇选择性提高,推测出质子酸作用下Cu基催化剂的甘油氢解反应机理。关键词:催化化学;甘油;Cu催化剂;催化氢解;质子酸doi:10.3969/j.issn.1008—1143.2014.09.009中图分类号:0643.36;TQ426.94文献标识码:A文章编号:1
4、008—1143(2014)09-0688-06CatalytichydrogenolysisofglyceroltopropanedioloverCu-basedcatalystsBAOTao,WANGBo,JIANGYunliang,CAIXinxing,JIWeirong(CollegeofChemicalEngineering,ZhejiangUniversityofTechnology,Hangzhou310014,Zhejiang,China)Abstract:TheperformanceofCu-basedcatalystsforglycerolcatalyt
5、ichydrogenolysiswasstudiedunderdifferentacidicconditionsinabatchautoclavereactor.Theinfluenceofthesuppo~s^y—A12O3,SiO2andSiContheactivityandtheselectivityofCu—basedcatalystswasinvestigated.TheresultsshowedthatCu—basedcatalystspreparedwiththreesupportspossessedhighcatalyticactivityandselect
6、ivityto1,2-pro—panediol,andl,3-propanediolwasobtainedbyusingweakprotonicacidSiO2asthesuppo~.ByaddingH2SO4(Bacid)asasubstratesolutionadditive,1,3-propanediolwaspromoted,butmeanwhilesomesidereactionshappened,whichresultedinasubstantialreductionoftheselectivityto1,2-propanedio1.Thepropertieso
7、fCu/SiO2catalystmodifiedbyphosphatetungsticacidwasinvestigatedinglycerolhydrogen—olysis.Itwasfoundthattheadditionofphosphatetungsticacidpromotedtheselectivityto1,3-propane—diol,andthestongertheacidityis,themoreeasilythesidereactionhappened.Theaciditywasweakenedandtheselectivitytoglycerolwa
8、senhancedwiththeincreaseofCu/HWP/SiO2catalystcalcinationtem—perature.ThemechanismofglycerolhydrogenolysisreactionoverCu—basedcatalystinthepresenceofprotonacidwasproposed.Keywords:catalyticchemistry;glycerol,Cu—basedcatalyst;catalytichydrogenolysis;protonacid收稿
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