溶胶-凝胶法制备CeO2负载CuO低温CO氧化催化剂.pdf

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1、第24卷第12期催化学报2003年12月Vol.24No.12ChineseJournalofCatalysisDecember2003ArticleID：0253-9837（2003）12-0887-02Communication：887!888LoW-temperatureCOOxidationonCuO／CeO2CatalystPreparedbySol-gelmethodZHENGxiucheng，HUANGWeiping，ZHANGshoumin，WANGshurong，WUshihua（DePartmento

2、fChemistry，NankaiuniOersity，TianJin37l，China）KeyWords：carbonmonoxide，oxidation，copperoxide，ceria，sol-gelmethodCLCnumber：O643／X7Documentcode：ACeriaisWidelyusedasapromoterin“three-Waythen~NO3（1ml）Wasaddedtothesolution.Aftercatalysts”（tWC）.thepromotioneffectofceriaW

3、asthesolutionWasheatedto65CinaWaterbath，cit-originallysupposedtobeinthestructuralaspectsandricacid（105g）WassloWlyaddedintoitWithvigor-［1］chemicalones.PreciousmetalsareWidelyusedforousstirringWithin1h.thereactionWasrunfor24h［2，3］exhaustgasemissioncontrol.~oWever，b

4、ecauseuntilthelightyelloWWetgelWasobtained.thegelthehighcostofpreciousmetalsandtheirsensitivityWasdriedat65Ctoremovethesolventsandthentosulfurpoisoning，attentionhasbeengiventonon-calcinedat320Cfor2.5htogiveayelloW-White［4!9］preciousmetalcatalystssuchascopperoxide

5、.CeO2nano-poWder.CuO／CeO2catalystWasprepared［4］LuoetalreportedthatCuO／CeO2catalystshoWedbyimpregnationofCeO2WithCu（NO3）2aCueousso-markedlyenhancedcatalyticactivityforCOoxidationlution.thepreparedsamplesWeredriedat80CandduetothecombinedeffectofCuOandCeO2.theythenc

6、alcinedat500Cand700Crespectively.theproposedthattheWell-dispersedCuO，Whichcanad-CuOloadingWas1.26%.sorbCOandisreducibleatloWtemperature，isre-thesurfaceareaofthecatalystWascalculatedbysponsibleforloW-temperatureCOoxidation.OurBEtmethodfromN2adsorption-desorptionis

7、otherms［5］grouphaspreparedCuO／CeO2catalystbysolvatedrecordedat-196CusingChemBEt-3000Physicalmetalatomimpregnation（SMAI）andconventionalAutosorbmeter（Guantachrome）.theXRDanalysisimpregnation（CI）.theCuO／CeO2preparedOiaWasperformedonD／Max-RAXdiffractometerWithSMAIgav

8、eaone-stepreductionduringtPRexperi-CuK!radiation.thecrystallitesizeofCeO2Wascal-ment，WhereasthatpreparedOiaCIgaveatWo-stepculatedusingtheScherrereCuationWithco