NiOCr2O3TiO2系列催化剂的结构和脱硝性能任晓光

　　　201129NiO-Cr2O3/TiO2系列催化剂的结构和脱硝性能＊任晓光1　任　超2　宋永吉1(1.,　102617;2.,　100029)　:NOx是主要的大气污染物之一,如何有效地消除NOx污染,一直是全球研究的热点。CO催化还原NO是NOx污染控制中的一个重要反应。TiO2具有较好的抗水,抗SO2性能,除用NH3作为还原剂的V-W-Ti催化体系外,有关TiO2作为脱硝催化剂载体的研究或应用报道不多。因此,开展对TiO2基催化剂用于脱销具有十分重要的理论和实际意义。本研究以纳米TiO2为载体,浸渍负载过渡金属氧化物,以CO为还原剂的脱硝催化剂的脱硝性能。以计算量的Ni(NO3)2和Cr(NO3)3混合溶液,浸渍纳米TiO2粉末,室温下搅拌30min至混合均匀,放入旋转蒸发器中,70℃、0.08Mpa下至水分蒸干为止,在550℃下、空气气氛中焙烧4h既得所需催化剂。用以上方法分别制备2%NiO-10%Cr2O3/TiO2、4%NiO-8%Cr2O3/TiO2、6%NiO-6%Cr2O3/TiO2、8%NiO-4%Cr2O3/TiO2与10%NiO-2%Cr2O3/TiO2等5种催化剂样品。:SCR脱硝;催化剂;NO+CO反应;TiO2THESTRUCTUREANDDENITRIFICATIONBEHAVIORSOFNiO-Cr2O3/TiO2CATALYSTSRenXiaoguang1　RenChao2　SongYongji1(1.BeijingInstituteofPetrochemicalTechnology,Beijing102617,China;2.BeijingUniversityofChemicalTechnology,Beijing100029,China)Abstract:NOxisoneofthemajorpollutantsintheatmosphere,andtheabatementofNOxhasbeenahotspotofstudyallovertheworld.CatalyticreductionofNOwithCOisconsideredtobeoneofthemostimportantreactionsforNOxcontrol.TiO2possessestheadvantagesofresistingwaterandSO2.ExceptsomepreviousreportsoftheV-W-TicatalyticsystemwithreducerNH3,littleworkhasbeendoneonTiO2assupportsofDeNOxcatalysts.SoitisofgreattheoreticalandpracticalsignificanttoinvestigatethepropertiesofTiO2-basedcatalystsinNO+COreaction.Inthisstudy,thesupportisnanometerTiO2,activecomponentistransi-tionmetaloxides,reducerisCO.TiO2powderwasdippedbyquantitativemixtureofNi(NO3)2andCr(NO3)3,keptstirringfor30minuntilmixedatroomtemperature,evaporatedtodrynessinrotatoryevapora-torat70℃、0.08Mpa.thenthesampleswerecalcinedat550℃for4h.2%NiO-10%Cr2O3/TiO2,4%NiO-8%Cr2O3/TiO2,6%NiO-6%Cr2O3/TiO2,8%NiO-4%Cr2O3/TiO2and10%NiO-2%Cr2O3/TiO2werepreparedbythemethod.Keywords:SCRDeNOx;catalysts;NO+COreaction;TiO2＊(21076025)。0　,NOx,NOx。NOx,NO、NO2、N2O、N2O3N2O4,NO90%。NOx3000t,[1-2]。NO,,,,NONO2,,;NO,。NO2,,,,、,NOx[3]。,。,175DOI:10.13205/j.hjgc.2011.s1.087　　　201129NOx,NH3NOx。TiO2V2O5[4]。CO,NO+CO(HC)NOx。,COCO2,NO。1970,[5]。/TiO2,CO2,NO+CO。,,。TiO2,NiOCr2O3,NO+CO,H2-TPR、XRD、BET,NO+CO。1　1.1　催化剂的制备100mLNi(NO3)2(,)Cr(NO3)3(,),TiO2(,,),30min,(RE52-99,),70℃、0.08MPa,550℃、4h。2%NiO-10%Cr2O3/TiO2、4%NiO-8%Cr2O3/TiO2、6%NiO-6%Cr2O3/TiO2、8%NiO-4%Cr2O3/TiO210%NiO-2%Cr2O3/TiO25。1.2　样品表征1.2.1　X(XRD)XRDXRD-7000X。CuKα(λ=1.5406),40kV,30mA,2θ:10～80°,4°/min。1.2.2　(BET)SCR,,。(BET)MicromeriticsASAP2020/。,,N2,BET。1.2.3　(H2-TPR)H2-TPRMicromeriticsTPx,100mg,N2350℃30min,20℃/min30mL/min,,5%H2,95%N2(),100～900℃,15℃/min,20mL/min。1.3　NO+CO反应性能测试,NO+CO。:0.1%()NO,0.2%()CON2。400mg,100mL/min。=6mm。ThermoElectronCorporation42i-HLHIDENQIC-20。1。1,2,3-;4,5,6-;7-;8-;9-NOx;10-1　2　2.1　粉末X射线衍射(XRD)550℃,4hNiO-Cr2O3/TiO2XRD2。,2θ25.281°、37.800°、48.049°、53.890°、55.060°、62.688°、75.029°TiO2;12%NiO/TiO243.363°NiO;12%Cr2O3/TiO233.614°36.206°Cr2O3;XRDNiOCr2O3,176　　　201129;,,。2　NiO-Cr2O3/TiO2XRD2.2　比表面积(BET)和催化活性NiO-Cr2O3/TiO21。1,NO100%,,400℃NO,CO+NO,NiO-Cr2O3。8%NiO-4%Cr2O3/TiO2,,。1　NiO-Cr2O3/TiO2/(m2·g-1)T10%/℃T50%/℃T90%/℃2%Ni-10%Cr40.76332533353584%Ni-8%Cr38.87182553363566%Ni-6%Cr39.99212563203598%Ni-4%Cr49.896826428734210%Ni-2%Cr43.53582583183522.3　程序升温还原(H2-TPR)TiO2NiOCr2O3TPR3。,TiO2(550℃),TiO2[6],。[7],NiO375℃。NiOTiO2,550℃,NiO400～450℃。[8],TiO2NiO。650℃,,:Ni2+TiO2Ni-Ti-O;,Ni2+Ti4+、。3,Ni-Ti-O。[9],Cr6+,H2-TPR3Cr6+—Cr3+—Cr2+—Cr3。Cr2O3350,520℃700℃。3,Cr2O3250℃,Cr2O3TiO2,。,400～600℃NiOCr2O3。700℃Cr2+-Cr,Cr2+Cr。3　NiO-Cr2O3/TiO2H2-TPR2.4　NO+CO反应性能测试NiO-Fe2O3/TiO24。,8%NiO-4%Cr2O3/TiO2,。[10],、NO+CO:1)CO;2)NO*N*O,*NN2;3)CO*OCO2,,。,;,Cr2O3,CO,,H2-TPR。(248)177　　　201129[13].[M].:,1981.[14],,.[J].,2007,30(10):20-23.[15],,.[J].,2003,11(4):21-22.[16].[J].,2002,18(1):19-20.[17]JonesKH,SenetJA,AnImprovedmethodtodeterminecellviabilitybysimultaneousstainingwithfluoresceindiactqate-propidiumiodide[J].TheJournalofHistochemistryandCytochemistry,1985,33(1):77-79.[18]AmanoT,HirasawaK,O'DonohueMJ,etal.Aversatileassayfortheaccurate,timeresolveddeterminationofcellularviability[J].AnalyticalBiochemistry,2003,314(1):1-7.[19],,,.FDA-PI[J].,2000,22(1):50-52.[20]SteponkusPL,LanphearF.Refinementofthetriphenyltetrazo-liumchloridemethodofdeterminingcoldinjury[J].PlantPhysi-ology,1967,42(10):1423-1426.[21]TowillLE,MazurP.Studiesonthereductionof2,3,5-tri-phenyltetrazoliumchlorideasaviabilityassayforplanttissuecul-tures[J].CanadianJournalofBotany,1974,53(11):1097-1102.[22]DuncanDR,WidholmJM.Osmoticinducedstimulationofthereductionoftheviabilitydye2,3,5-triphenyltetrazoliumchlo-ridebymaizerootsandcalluscultures[J].JournalofPlantPhysi-ology,2004,161(4):397-403.[23]IshikawaE,BaeS-K,MiyawakiO,etal.Freezinginjuryofculturedricecellsanalyzedbydielectricmeasurement[J].JournalofFermentationandBioengineering,1997,83(3):22-226.[24]BelotiV,BarroSMAF,FreitasJCD,etal.Frequencyof2,3,5-triphenyltetrazoliumchloride(TTC)non-reducingbacteriainpasteurizedmilk[J].RevistadeMicrobiologia,1999,30(2):137-140.[25]Katayame-HirayamaK.Inhibitionoftheactivitiesofβ-galac-tosidaseanddehydrogenasesofactivatedsludgebyheavymetals[J].WaterResearch,1986,20(4):491-494.[26]ChangWC,ChenMH,LeeTM.2,3,5-triphenyltetrazoliumreductionintheviabilityassayofUlsafasciata(Chlorophyta)inresponsetosalinitystress[