堿金屬對過渡金屬硫化物加氫脫硫反應的影響.pdf

1、大連理工大學碩士學位論文堿金屬對過渡金屬硫化物加氫脫硫反應的影響姓名：果崇申申請學位級別：碩士專業(yè)：工業(yè)催化指導教師：李翔20090629堿金屬對過渡金屬硫化物加氫脫硫的影響EffectofalkalimetalsonhyhrodesulfurizationperformanceoftransitionmetalsulfidesAbstractInrecentyears，theproductionofcleandieselbyhydro

2、treatingandespeciallybyde印hydrodesulfurization(HDS)hasattractedincreasingattentionduetotheintroductionofnewenvironmentallegislationsAmongallsulfurcontainingcompoundspresentindiesel，dibenzothiophene(DBT)anditsalkylatedder

3、ivativesarethemostrefractorycompoundstodesulfurizeduetosterichindranceTheHDSofDBTproceedsthroughtwoparallelpathwaysIntheSO—calledhydrogenolysis(HYG)pathway，thesulfuratomisdirectlyremovedfromthemoleculeviaC—Sbondcleavage，

4、leadingtotheformationofbiphenyl(BP)，whileinthehydrogenation(HYD)pathway，thearomaticringishydrogenatedandthesulfurisremovedsubsequentlytoformcyclohexylbenzene(CHB)ThehydrogenationofthearomaticringofDBTwhichreleasesthester

5、ichinderance，willremarkablyenhancetheHDSreactivityofDBTanditsalkylatedderivatesNevertheless，allincreaseinthecatalysthydrogenationactivityalSOcausesanincreaseinthehydrogenconsumptionwhichisundesirablefromaneconomicpointof

6、viewHence，studiesonboththeactivityandtheBPselectivityofHDScatalystsareneededfordevelopingbeaerdeepHDScatalystsK20andNa20wereintroducedtotransitionalmetalsulfidecatalystsprecursorbydifferentimpregnationmethodThehydrodesul

7、furization(HDS)performancesofthetransitionalmetalsulfidecatalystswerestudiedusingamodelfuelcontaining08wt％DBTindecalinTheresultsshowthattheHDSofDBTpredominatelytakestherouteofdirectdesulfurization(DDS)overthetransitional

8、metalsulfidecatalystswhenK20andNa20wereintroducedAstoCoMocatalysts，theactivityofDBTHDSwasmaintainedwhenK20wasintroducedbyconsecutiveimpregnationmethod，manwhile，theintroducedofNa20bythesamemethodcausedareductionofactivity

9、BothNa20andK20CanmakeacontributiontoBPselectivity。ThroughthecomparisonwecanfoundthatconsecutiveimpregnationwasapreferablemethodtoHDSacitivityandBPselectivityForNiMocatalysts，1％introductionamountofNa20byconsecutiveimpregn

10、ationmethodplaypositiveeffectsonbothenhancedHDSacitivityandBPselectivityNevertheless，neithertheNa20norI(20CanplaypositiveeffectsontheHDSactivityforNiWcatalysts111ehydrogenationof1heptenewasusedasaprobereactiontoinvestiga