蜂窝状堇青石载体Al2O3涂层的原位合成.pdf

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1、第24卷第7期催化学报2003年7月Vol.24No.7ChineseJournalofCatalysisJuly2003文章编号：0253-9837（2003）07-0513-07研究论文：513"519蜂窝状堇青石载体AlO涂层的原位合成23华金铭，蔡英灵，林性贻，郑起，魏可镁（福州大学化肥催化剂国家工程研究中心，福建福州350002）摘要：采用改进的原位合成法（原位-浸涂法）在蜂窝状堇青石载体表面制备了多孔氧化铝涂层.着重研究了制备条件对涂层负载、晶相及其孔结构性质的影响，并与其他方法制备的涂层进行了比较.结果表明，采用多次原位合成法制备能提高氧化铝涂层

2、的牢固度，但每次负载量偏低；原位-浸涂法适宜的制备参数为：水解温度83C，水／异丙醇铝摩尔比60，p~值3.5"4.0，焙烧温度500C.原位-浸涂法有利于制备Al203涂层，具有较好的牢固度，而且涂层的孔径分布窄，具有较大的比表面积、比孔体积和平均孔径.关键词：原位合成法，氧化铝，涂层，孔结构，蜂窝结构，堇青石，载体中图分类号：0643文献标识码：AIn-SituSynthesisofAl2O3CoatingonHoneycomb-likeCordieriteSupportHUAjinming，CAIyingling，LINxingyi，ZHENG@i!，W

3、EIKemei（NationalresearchcenterofchemicalFertilizercatalysts，Fuzhouunioersity，Fuzhou352，FuJian，china）Abstract：Thehoneycomb-likecordieriteisgenerallyemployedtoactasacatalystsupport.~owever，owingtoitslowspecificsurfacearea，itisreCuiredtobecoatedwithporousalumina.lnthispaper，itwastriedt

4、opre-paretheporousaluminawithhighsurfaceareaontheinternalsurfaceofhoneycomb-likecordieritethroughin-situplusdip-coatingmethodofloading!-Al203priortohydrolysisofthealuminaduringtheprocessofpreparingaluminasol.AdesiredamountofAl（i-pr0）3wasaddedslowlyintodemineralizedwaterat83Cwithstir

5、ringunderrefluxconditions.After30min，thecordieritemonolithwasadded，followedbycontinuousstirringfor1.5h.Thenthesolstoodat83Cforasufficientlylongtimeuntilalloftheisopropanolwasevaporatedbyre-movingrefluxcondenser.Dilute~N03wasaddedtoadjustthep~valueofthesolutionto3.5"4.0forpeptiza-tio

6、n.Thentheclearboehmitesolwascontinuouslystirredfor18hunderrefluxconditionsagain.Theremainedsolintheinternalchannelofthemonolithwasremovedbyairflow.Aftereachdip-coating，themonolithwasdriedat120Cfor20min，andsubseCuentlycalcinedat300Cfor20min.Al00~coatedonthemonolithfi-nallyconvertedto

7、!-Al203bycalciningthecoatedsupportat500Cfor3h.Thein-situmethodwasimprovedbycombiningwithconventionaldip-coating.Theeffectsofpreparationparametersontheloading，crystalcom-position，andporestructureofthealuminacoatingwerestudied，followedbybeingcomparedwiththecorre-spondingcoatingprepare

8、dthroughothermethod