堿金屬對過渡金屬硫化物加氫脫硫反應(yīng)的影響.pdf

1、大連理工大學(xué)碩士學(xué)位論文堿金屬對過渡金屬硫化物加氫脫硫反應(yīng)的影響姓名：果崇申申請學(xué)位級別：碩士專業(yè)：工業(yè)催化指導(dǎo)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