Ni金屬整體型催化劑催化甲烷自熱部分氧化制合成氣的研究.pdf

1、』[IJ[IrllrflFIlrll!rl[rF[1llIFl[rlJlfllrflPIllY1531359碩士學位論文Ni金屬整體型催化劑催化甲烷自熱部分氧化制合成氣的研究AutothermalPartialOxidationofMethanetoSynthesisGasCatalyzedbyNimetallicmonolithcatalysts一級學科：化學工程與工藝學科專業：化學工藝作者姓名：李兵兵指導教師：王亞權教授天津大學化工

2、學院二零零八年六月ABSTRACTSynthesisgasismainlyproducedbysteamreformingofmethane，whichhasseveralshortages，suchashighenergyintensityeasycarbondeposition，andhigherH2／CatioswhicharenotsuitableforseveralimportantprocessesBecauseofitsl

3、owinvestmentandlowenergyconsumptionwithinstantreactionrate，partialoxidationofmethanehasattractedmuchattentionInthepresentwork，NimetallicmonolithcatalystswerepreparedwithNifoamandfurthertreatedbyacidInordertostudythemecha

4、nismofthecatalyticpartialoxidationofmethaneonNimetallicmonolithcatalyst，catalystlengthandgasflowratewerevaried，andglobalconversionandselectivitydatawerecorrelatedwiththecatalysttemperatureprofilesMorever，consideringthatt

5、heNimetallicmonolithismuchstable，buthasloweractivitythansupportedcatalysts，NimonolithNi／MgAl204dualbedwasstudiedfortheautothermalpartialoxidationofmethaneaswellTheresultsshowedthatthereactionofmethaneautothermalpartialox

6、idationontheNimetallicmonolithcatalystproceededintwostages：initialdirectpartialoxidation，followedbysteamreformingofthemethaneunconvertedFromtheinlettoO7mmofthecatalystbedwastheoxidationzoneinwhich02wascompletelyconverted

7、Furtheronwardsalongthecatalystbed，CH4conversion，H2andCOselectivitiesandthetemperatureofthecatalystbedallincreasedsharply，andthetemperaturereachedthemaximumatthepositionof15mmAfter02totalconversion，methaneconversioncontin

8、uedduetothereformingoftheremainingmethanewithH20inthesecondzone，buttheconversionratesloweddownsignificantly；theH2andCOformationratesalsodecreased，withthedecreaseofCOtolargerextentthanH2；thecatalysttemperaturealsosteeplyd

9、ecreasedafterthemaximumaswellTheslightincreaseofC02molarflowrateinthesteamreformingzoneshowedthatsomewatergasshiftoccurredinthecatalystbedandnoC02reformingwasobservedTheexperimentsresultsindicatedthatthesyngaswasformedmo

10、stlybydirectpartialoxidationintheoxidationzone，andthecontributionofsteamreformingtosyngaswasminorResultonthecatalyticperformanceofNimonolith—Ni／MgAl204dualbedshowedthattheactivityandselectivitiesofdualbedwerehigherthanNi