负载Pd催化剂上丙烯选择还原NO的分析

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1、2.通过实验对催化剂的组分配比和制备工艺进行了参数优化，确定以浸渍法制备的催化剂焙烧温度在550℃左右、反应气中C3H6浓度为NO-1浓度的1.5倍、空速小于10000h时催化剂具有最高的催化效率。3.BET实验表明本实验制备的催化剂具有很高的比表面积，XRD实验表明Pd、Zr在催化剂表面的存在状态为PdO、ZrO2。4.通过反应动力学计算确定了C3H6和NO的反应速率公式为xyzabcγNO=kC1NOCCH36CO2和γCH36=kCC2NOCH36CO2，其中各反应级数：x=1，y=0.651，z=0.53(当O2含量>3%时z=0)，a=0，b=1，c=0.37

2、9。关键词：Al2O3负载Pd催化剂，C3H6，选择催化还原，ZrO2第II页SelectiveCatalyticReductionofNOwithC3H6overPdCatalystsAbstractInrecentdays,nitrogenoxides(NOx)havebecomemuchmorepollutedasthedevelopingofindustrialandautomotiveindustry,andtheabatementofNOxisgettingmoreandmoreattention.Amongthedifferenttreatingmetho

3、ds,selectivecatalyticreduction(SCR)ofNOxwithhydrocarbonsisconsideredasthemostconcernedandpromisingone.Butbecauseofthelowcatalyticefficiency,harshreactionconditionsandotherfactors,apartfromthethree-waycatalystsintheautomobileexhaustpurification,theSCRmethodofNOxwithhydrocarbonshasnotbeena

4、ppliedonotherconditions.Therefore,tofindonemoreefficientandubiquitousSCRcatalystisahotspotinrecentresearches.Palladium(Pd)asahighefficientandmoderate-costpreciousmetalcatalysthasalwaysbeenastudyhotspot.Andpropylene(C3H6)withreadilyavailable,low-costandhighreactivityadvantagesisanidealhyd

5、rocarbonreductant.Inthispaper,theSCRprogressofNOxwithC3H6onAl2O3loadingPdcatalystsissystematiclystudiedwiththecatalystscharacterizedbyBETandXRDexperiments,andthereactionkineticsofNOreductionwithC3H6wasexplored,too.Themainresultsareasfollows:第III页1.Al2O3loadingPdcatalystshowshighcatalytic

6、efficiencyintheSCRreactionatthelowtemperatureabout250℃.TheintroductionofZrO2canimprovetheefficiecyofcatalyst,whileCe,Feandotherelementsrepresentoppositebehavior.2.Thecomponentsandpreparationparametersofcatalystswereoptimizedbyexperiments.Wedeterminedthattothehighestcatalyticefficiencythe

7、catalystspreparedbyimpregnationshouldbecalcinedatabout550℃,theC3H6concentrationshouldbe1.5timesofNOconcentration,and-1theairspeedshouldbelessthan10000h.3.BETexperimentsshowthatthecatalystpreparedinthisexperimenthasahighsurfacearea.XRDexperimentsshowthatPd,Zrinthepresenceo