促进钾盐为水煤气变换反应的钌_交流催化剂(6)

co变换催化剂

Journal287(2016)155–161

wasstrongbase.ItisreportedthatRu(NO)(NO3)3existedintheformof[RuNO(NO3)4H2O]Àor[RuNO(NO2)(NO3)2(OH)H2O]Àinsolution[34].Thus,thesenegativeRuprecursorscouldhardlybeadsorbedonthesurfaceoftheK2CO3-treactedAC,andthentheRunanoparticlesinthesolutiontendedtoaggregateandthendepositedintothesupportwithalargeparticleandalowdisper-sion.Withthesameamountoftheactivecomponent,theaggrega-tionofmetalnanoparticlesresultedinalowratioofexposedactivesitestopromotethecatalyticreaction,thusalowercatalyticactiv-itywasobserved.Therefore,theaggregationofmetalnanoparticlesshouldbetheonereasonoftheobservedlowWGSactivityoftheRu/K2CO3-ACcatalyst.4.Conclusions

Inthiswork,aseriesofpotassiumsaltdopedRu/ACcatalystswerepreparedandstudiedtheircatalyticactivityoverWGSreac-tion.Itwasfoundthatthekindofpotassiumsaltsigni cantaffectedtheRu/ACcatalyticactivity.Ru-K2CO3/ACshowedhighercatalyticperformancethanRu-KOAc/ACandRu-KOH/ACcatalysts.TheCOconversiongreatlyincreasedfrom13.6%forRu/ACcatalystto56.1%forK2CO3-Ru/ACcatalystat300°C.Thesigni cantincreaseofthecatalyticactivityoftheK2CO3-Ru/paredwithK2CO3-Ru/ACcatalyst,theRu/K2CO3-ACcatalystgavemuchlowerWGSactiv-ity.ThelowcatalyticactivityofRu/K2CO3-ACwasmainlyduetotheaggregationofRunanoparticles.Acknowledgement

TheProjectwassupportedbyNationalNaturalScienceFounda-tionofChina(No.21206200).AppendixA.Supplementarydata

Supplementarydataassociatedwiththisarticlecanbefound,intheonlineversion,at/10.1016/j.cej.2015.10.119.

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