由类水滑石前驱体制备的CuZnAl复合氧化物催化剂催化湿氧化处理苯酚.pdf

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1、第24卷第8期催化学报2003年8月Vol.24No.8ChineseJournalofCatalysisAugust2003ArticleID：0253-9837（2003）08-0563-02Communication：563"564CuznAlmixedOxideCatalystpreparedfromHydrotalcite-likeprecursorforCatalyticWetOxidationofphenolSUNYingl，2，YANGminl，DOUheruil，hEYul，WANGWei2，SUNCe

2、nglinl（lDalianinstituteofChemicalphysics，TheChineseacademyofSciences，Dalianll623，Liaoning，China；2Dalianrailzayinstitute，Dalianll628，Liaoning，China）Keywords：copper，Zinc，aluminum，compositeoxide，hydrotalcite-like，catalyticWetoxidation，phenolCLCnumber：O643／X7Document

3、code：ATheefficiencyofseveralnoblemetalsforcatalyt-cinedat700CshoWshigheractivityandstability.icWetoxidation（CWO）ofvariouspollutantshas［l，2］beendemonstrated.HoWever，thenoblemetalsareexpensive，affectinggreatlytheeconomicsofthecorrespondingprocess.Asanalternative，th

4、euseof［3"5］，buttransition-metaloxideshasbeenconsideredtheyhaveamainproblemofleachinginthecorrosive［6，7］reactionmixtures.AlejandreetalreportedthattheleachingcanbemuchreducedWhenCuAlorCu-NiAlmixedoxidepreparedfromhydrotalcite-likecompound（HTLC）precursorsisusedasthe

5、catalystforCWO.Here，Wereportontheremarkablestabili-tyofCuznAlmixedoxidepreparedfromHTLCpre-cursorsforCWO.TheprecursorsWereobtainedbycoprecipitation.AsolutioncontainingaslightexcessofNa2CO3WasFig1CatalyticactivityorCuleachingofthecatalystaddedtoasolutioncontaining

6、appropriateamountsofasafunctionofcalcinationtemperatureCu（NO3）2·6H2O，zn（NO3）2·6H2OandAl（NO3）3·9H2Oat70CWithvigorousagitation.Afterprecipi-ThissampleWasfurthertestedinafixed-bedre-tation，thegelWasrefluxedat70Cfor2h.Subse-actor.ThereactionconditionsWereasfolloWs：P（

7、O2）Cuently，thegelWasfilteredandWashedWithdis-=0.8Mpa，CV（gas）=20ml／min，CV（liC）=30tilledWateruntilthefiltrateWasneutral.Theprecur-ml／min，V（cat）=l5mland!=l60C.TheresultssorsWeredriedat60C.ThesamplesWerecalcinedareshoWninFig2.Thecatalysthasnolossinactivi--6Withaheati

8、ngrateof5C／minandthefinalcalcina-tyandCuleachingislessthan0.3>l0duringthetiontemperatureWasheldfor8h.Wholereactionprocess.ThephenolCOdremovalef-ThereactionsWer