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Efficient ammonia synthesis over a RuLa0.5Ce0.5O1.75 catalyst pre-reduced at hightemperatureRU_高效氨合成 高温预还原La0.Ce0.O1.75催化剂

Efficient ammonia synthesis over a RuLa0.5Ce0.5O1.75 catalyst pre-reduced at hightemperatureRU_高效氨合成 高温预还原La0.Ce0.O1.75催化剂

ID：40849818

大小：1.10 MB

页数：8页

时间：2019-08-08

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1、ChemicalScienceViewArticleOnlineEDGEARTICLEViewJournal

2、ViewIssueEfficientammoniasynthesisoveraRu/La0.5Ce0.5O1.75catalystpre-reducedathighCitethis:Chem.Sci.,2018,9,2230temperature†aabaaYutaOgura,KatsutoshiSato,Shin-ichiroMiyahara,YukikoKawano,cdcdbTakaakiTor

3、iyama,TomokazuYamamoto,SyoMatsumura,SaburoHosokawaaandKatsutoshiNagaoka*Ammoniaisanimportantfeedstockforproducingfertiliserandisalsoapotentialenergycarrier.However,theprocesscurrentlyusedforammoniasynthesis,theHaber–Boschprocess,consumesahugeamountofenerg

4、y;thereforethedevelopmentofnewcatalystsforsynthesisingammoniaatahighrateundermildconditions(lowtemperatureandlowpressure)isnecessary.Here,weshowthatRu/La0.5Ce0.5O1.75pre-reducedatanunusuallyhightemperature(650C)catalysedammoniasynthesisatextremelyhighrat

5、esundermildconditions;specifically,atareactiontemperatureof350C,therateswere13.4,31.3,andCreativeCommonsAttribution3.0UnportedLicence.44.4mmolg1h1at0.1,1.0,and3.0MPa,respectively.Kineticanalysisrevealedthatthiscatalystisfreeofhydrogenpoisoningundertheco

6、nditionstested.ElectronenergylossspectroscopycombinedwithO2absorptioncapacitymeasurementsrevealedthatthereducedcatalystconsistedoffineRuparticles(meandiameter<2.0nm)thatwerepartiallycoveredwithpartiallyreducedLa0.5Ce0.5O1.75andweredispersedonathermostables

7、upport.Furthermore,FouriertransforminfraredspectrameasuredafterN2additiontothecatalystrevealedthatN2adsorptiononRuatomsthatinteracteddirectlywiththereducedLa0.5Ce0.5O1.75weakenedtheN^Nbondandthuspromoteditscleavage,whichistherate-Received17thDecember2017d

8、eterminingstepforammoniasynthesis.Ourresultsindicatethathigh-temperaturepre-reductionofAccepted13thJanuary2018thiscatalyst,whichconsistsofRusupportedonathermostablecompositeoxidewithacubicfluoriteThisarticleislicensedunderaDOI:10.1039/c7sc05343fstructurean

9、dcontainingreduciblecerium,resultedintheformationofmanysitesthatwerehighlyrsc.li/chemical-scienceactiveforN2reductionbyhydrogen.OpenAccessArticle.Publishedon15January2018.Downloadedon8/13/20184:01:14AM.Introductiona

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