Carbon Dioxide Capture from atmospheric air using hydroxide spray

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1、Environ.Sci.Technol.2008,42,2728–2735CarbonDioxideCapturefromNearlyallcurrentresearchonCCSfocusesoncapturingCO2fromlarge,stationarysourcessuchaspowerplants.AtmosphericAirUsingSodiumSuchplansusuallyentailseparatingCO2fromfluegas,compressingit,andtransportingitvia

2、pipelinetobeHydroxideSpraysequesteredunderground.Incontrast,thesystemdescribedinthispapercapturesCO2directlyfromambientair(aircapture).Thisstrategywillbeexpensivecomparedtocapture§JOSHUAHK.STOLAROFF,frompointsources,butmayneverthelessactasanimportantDAVIDW.KEIT

3、H,AND,complement,sinceCO2emissionsfromanysectorcanbeGREGORYV.LOWRY*captured,includingemissionsfromdiffusesourcessuchasChemicalandPetroleumEngineering,UniversityofCalgary,aircraftorautomobiles,whereon-boardcarboncaptureisandDepartmentsofCivilandEnvironmentalEngi

4、neeringverydifficultandthecostofalternativesishigh.Additionally,andEngineeringandPublicPolicy,CarnegieMelloninafutureeconomywithlowcarbonemissions,aircaptureUniversity,Pittsburgh,Pennsylvania15213mightbedeployedtogeneratenegativenetemissions(1).Thisabilitytoredu

5、ceatmosphericCO2concentrationsfasterReceivedOctober15,2007.RevisedmanuscriptreceivedthannaturalcyclesallowwouldbeparticularlydesirableinFebruary05,2008.AcceptedFebruary06,2008.scenarioswhereclimatesensitivityisonthehighendofwhatisexpected,resultinginunacceptabl

6、eshiftsinlandusabilityandstresstoecosystems.Previousresearchhasshownthataircaptureistheoreti-Incontrasttoconventionalcarboncapturesystemsforcallyfeasibleintermsofthermodynamicenergyrequire-powerplantsandotherlargepointsources,thesystemdescribedments,landuse(2),

7、andlocalatmospherictransportofCO2inthispapercapturesCO2directlyfromambientair.Thishas(3).Toassessthepracticalfeasibilityofaircapture,exampletheadvantagesthatemissionsfromdiffusesourcesandpastsystemsusingcurrenttechnologyhavebeenproposedemissionsmaybecaptured.Th

8、eobjectiveofthisresearchis(1,2,4).TheproposalsgenerallyincludeasodiumhydroxidetodeterminethefeasibilityofaNaOHspray-basedcontactorfor(NaOH)orcalciumhydroxide(Ca(OH)2)solutio