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1、Gasificationofbiomasscharsincarbondioxide:dependenceofgasificationrateontheindigenousmetalcontentM.P.KannanandG.N.RichardsWoodChemistryLaboratory,UniversityofMontana,Missoula,MT59872,USA(Received20July7989;revised25January7990)Charswerepreparedunderstandardc
2、onditions(75OC,N,)fromtendifferenttypesofbiomassbelongingtoawiderangeofplantoriginsandwithawiderangeofnaturalmetalioncontents.Whenthesecharsweregasifiedwithcarbondioxideat700°Ctheratesofgasificationwerefoundtoshowlineardependenceonthecombinedmolarconcentrati
3、onofthedominantmetals(potassiumandcalcium),withcorrelationcoefficientI=0.970,providedtwosampleswereomitted.Thesamplesomittedwerefromwheatstrawandcoirdust,whichhadthehighestsiliconcontentofthesamplesstudiedandshowedabnormallylowratesofgasification.Itwasconclu
4、dedthatthecatalyticeffectofKwasreducedbyreactionwithsilicatoformsilicateduringpyrolysis.ThiswasconfirmedbyadditionofsilicatoahighK,lowSisample(potatopulp)andbyobservationofthereducedgasificationrateinthederivedchar.CatalysisofgasificationbyCa(inlignite)doesn
5、otappeartobesignificantlyreducedbysilicaundertheaboveconditions.Theseresultsindicatethatthegasificationreactivitiesofcharsfromanytypeofbiomasscanbepredictedwithreasonablecertaintyfromknowledgeofthemetalioncontent,providedthebiomasshaslowSicontent.Italsoappea
6、rsthatthechemicalandphysicalpropertiesofthecharsareremarkablysimilar,despitethewiderangeofplantspeciesandmorphologiesfromwhichtheyarederived.(Keywords:gasification;char;carbondioxide)Thermochemicalconversionofbiomasstosynthesisgasreactivitiesofdifferentbioma
7、sstypesonthebasisofmetal(amixtureofCOandH,)hasreceivedrelativelylittlecontent.attentioncomparedwiththesimilarconversionofcoal.Biomassmaterialssuchaswoodwastes,lowgradeplants,andagriculturalresidues,togetherwithmunicipalsolidEXPERIMENTALwastes,notonlyaddtothe
8、totalorganicrawmaterialMaterialsbasethatcanbeutilizedforenergypurposes,buttheyTable1givesalistofthebiomasssamplesusedinthisalsohavetoberemovedforenvironmentalreasons.study.Thefirsttenareuntreate
