co变换催化剂
PromotedpotassiumsaltsbasedRu/ACcatalystsforwatergasshift
reaction
YajuanMaa,BingLiua, ,MengmengJinga,RenyuanZhangb,JunyuChena,YuhuaZhanga,JinlinLia,
KeyLaboratoryofCatalysisandMaterialsSciencesoftheStateEthnicAffairsCommission&MinistryofEducation,CollegeofChemistryandMaterialScience,South-CentralUniversityforNationalities,Wuhan430074,PRChinab
CollegeofChemistryandChemicalEngineering,XiaMenUniversity,XiaMen361005,PRChina
a
highlights
TheadditionofpotassiumsaltimprovedtheRu/ACactivityoverWGSreaction. COconversionincreasedfrom13.6%forRu/ACto56.1%forK2CO3-Ru/ACat300°C. Theincreaseoftheactivitywasduetothereductiontemperatureofthecatalyst. Thehighhygroscopicabilityofthesaltalsoincreasedthecatalystactivity.
articleinfoabstract
…… 此处隐藏1281字 ……
Water–gas-shiftreactionRutheniumbasedcatalystsPotassiumsaltsDoping
1.Introduction
Thewater–gasshift(WGS)reaction(CO+H2O?H2+CO2,DH=41.2kJmolÀ1)isoneofthemostfundamentalreactionsfortheremovalofCOandproductionofhighpurityH2fromsyngas.Thisreactioncanbeusedfortheupgradingofthereformedgasinfuelcells,asitiseffectivetoreduceCOtoaverylowcontent,avoidingthepoisoningofPtelectrodes[1].Inaddition,WGSreac-tionhasalsoplayedakeyroleinadjustingtheH2/COratioforFis-cher–Tropsch(FT)processes[2]andprovidinghydrogen-richCorrespondingauthors.Tel./fax:+862767842572.
E-mailaddresses:liubing@(B.Liu),lijl@(J.Li).
/10.1016/j.cej.2015.10.119
1385-8947/Ó2015ElsevierB.V.Allrightsreserved.
streamsforfuelcells[3].Industrially,inordertoproducehighpur-ityH2atthehighestpossibleCOconversion,two-stagemethodisappliedinWGSreaction:ahightemperatureshiftreactionoperat-ingat300–450°CbytheuseofFe-basedcatalysts(e.g.,Fe2O3/Cr2O3)andalowtemperatureshiftreactionoperatingat200–270°CbytheuseofCu-basedcatalysts(e.g.,Cu/ZnO/Al2O3)[4].However,someproblemsstillremaininthecomicaltwo-stageWGScatalysts.ThecatalyticactivityofFe2O3/Cr2O3isrelativelowatlowreactiontemperatures.Furthermore,theFe2O3/Cr2O3containsabout1–2wt.%hexavalentchromium(Cr6+),whichishighlytoxictohumans,organismsandtheenvironment[5].TheCu/ZnO/Al2O3catalystsdeactivatedatanoxidizingatmosphere[6].Therefore,theneedforthedevelopmentofhighactiveWGScatalystsstillremainsanimportantgoalinWGSreactions.