合成气催化转化制甲烷反应工艺的-研究

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1、北京化工大学硕士学位论文methanation．Inthispaper，weadoptindustrialmoldingraschigringsandclovergamma—A1203ascarrier．PreparedwithdifferentNiOloadingamount，differentadditivesanddifferentadditivecontentsbyimpregnationmethodtomakeaseriesofcatalysts．Usingquartzfixedbedrea

2、ctortoperformancecatalysts’evaluation．Characterizethecatalysts’structurebyXRD，TPR，BET,TEM，TGandSOforth．WefindthattheoptimumcontentofNiOis18．7％and26．1％byloadingdifferentcontentsofNiO(7．5％，11．2％，18．7，26．1％，37．4％，and44．8％)ontoindustrialmoldingraschingringc

3、artier．Withdifferentadditivesaddedtothecarrier，alkalineearthmetaloxides(MgO，CaO，BaO)，rareearthmetaloxides(La203，Ce02，5m203)andtransitionmetaloxides(Fe203，CoO，CuO，Zr02，Ti02，M003)，wefindthatadditivescanimprovetheactivityofthecatalysts，amongwhichMgOistheop

4、timumalkalineearthmetaloxidesandLa203istheoptimumrareearthmetaloxides．WemanufactureaseriesofNi—basedcatalystswhicharemodifiedwithMg，La．Weselect26．1％NiO一6．4％La203]MgAl204@A1203(BL)(4．1％MgO)astheoptimalcatalystafteractivityevaluationunderwaterphenomenon．T

5、hereactionbecomeactiveat200。C，theconversionrateofCOreached100％，theselectivityofCH4reached99．05％，underthephenomenonwithoutwater．Thereactionbecomeactiveat220。C，theconversionrateofCOreached100％，theselectivityofCI-t4reached98．12％，underthephenomenonwith25v01

6、％waterABSTRACTinreactiongases．After1572hourscontinuousstabilityreaction，thecatalystcanstillperformancewell．Thatistosaythatthiscatalysthasaverybroadprospectinindustry．WefindthattheoptimumcontentofNiOis26．1％byloadingdifferentcontentsofNiO(7．5％，11．2％，18．7，

7、26．1％，37．4％，and44．8％)ontoindustrialmoldingclovercarrier．WeuseMgOtomodifythecarderandeventuallygetthe26．1％NiO／MgAl204@A1203(BL)(4．1％MgO)catalyst．UnderthephenomenonhasV(H2)：V(CO)：V(C02)=110：22：7．7inreactiongases，thecatalyst’Sperformanceissuperiorafter1448

8、hourscontinuousstabilityreaction，withanaverage99．38％conversionrateofCO，anaverage90．18％conversionrateoff02andanaverage99．64％selectivityofCH4．UnderthephenomenonhasV(H2)：V(C0)：V(C02)=70：22：14inreactiongases，thecatalyst’Sperformancei