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《堇青石整体式催化剂.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、石油学报(石油加工)2014年2月ACTAPETROIElSINICA(PETROLEUMPROCESSINGSECT10N)第3O卷第1期文章编号:1001—8719(2014)01—0024—08表面氨基改性制备高负载量高分散性钯/堇青石整体式催化剂周放,朱玉超,周永华,叶红齐,金一粟(中南大学化学化工学院,湖南长沙410083)摘要:提出了一种无需涂层就可获得较高Pd负载量,且分散性好的Pd/堇青石催化剂的制备方法。对堇青石载体及孔道表面进行氨基官能团化,然后负载金属Pd。利用傅里叶红外光谱(
2、FT-IR)、X射线衍射(XRD)透射电镜(TEM)、电感耦合等离子体发射光谱(ICP—AES)以及滴定方法表征载体表面及负载的Pd粒子。结果表明,在3一氨丙基三乙氧基硅烷(APTS)与载体质量比0.015、80℃条件下对堇青石改性12h,所得载体负载金属Pd,可得到最高的Pd粒子分散度,制备的Pd/堇青石催化剂表现出对苯乙烯加氢反应最高的活性。采用N一氨乙基一氨丙基三甲氧基硅烷(TPED)改性堇青石载体,Pd粒子负载量能提高1倍以上,但Pd粒子的分散度降低。此外堇青石的酸预处理不利于其氨基官能团化
3、和Pd粒子在其上的分散。关键词:堇青石;钯;氨基硅烷;表面改性;苯乙烯加氢中图分类号:O643文献标识码:Adoi:10.3969/J.issn.1001-8719.2014.01.004PreparationofPd/CordieriteMonolithicCatalystviaSurfaceModificationofCordieritebyAminoGroupsZHOUFang,ZHUYuchao,ZH0UYonghua,YEHongqi,JINYisu(ChemistryandChemica
4、lEngineeringCollege,CentralSouthUniversity,Changsha410083,China)Abstract:AsimplemethodtoachievehighPddispersionaswellasimprovedPdloadingoncordieritemonolithwithoutwashcoatlayerwasreported.Thecordieritemonolithwasfunctionalizedwithaminesilanes,andthenPd
5、wasloaded.Fouriertransforminfraredspectroscopy(FT—IR),X—raydiffraction(XRD),transmissionelectronmicroscopy(TEM),inductivelycoupledplasmaatomicemissionspectroscopy(ICP—AES)andtitrationwereusedtocharacterizethefunctionalizedmonolithandtheloadedPdparticle
6、s.ResultsshowedthatthehighestdispersionofPdparticlescouldbeobtainedbyfunctionalizingmonolithby3一aminopropyltrimethoxysilane(APTS)withthemassratioofAPTStosupportof0.015at80℃for12h.TheobtainedPd/cordieritecatalystexhibitedthehighestactivityforstyrenehydr
7、0genati0nreaction.TheutilizationofN~[3一(trimethoxysily1)一propylethylene]diamine(TPED)infunctionaIizingcordieritemonolithcouldimprovethePdloadingamountmorethanonefold,whilethedispersionofPdparticlesdecreased.Inaddition,theacidpretreatmentofmonolithwasno
8、tbeneficialtoaminesilanefuncti0na1izingofmonolithandthedispersionofPdparticlesonit.Keywords:cordierite;palladium;aminesilane;surfacemodification;styrenehydr0genation收稿日期:2013-01—17基金项目:国家自然科学基金项目(21006129)和中央高校基本科研业务费(721500170)资助第一作者:周
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