简介:<正>NaYzeolitewasmodifiedthroughdealuminationwithoxalicacid,andtheHYzeolitewasobtainedbycalcinationofthemodifiedNaYzeolite.Thezeolitemoldingprocesswascarriedoutatambienttemperature(25℃),andtheinfluenceofsolid/fuelmassratioandadsorptivedesulfurizationtimeontheHYzeolitewereinvestigatedthroughtestsonstaticselectiveadsorptivedesulfurizationofFCCgasolinecontainingorganicsulfurcompounds(withaScontent=135ppm).ThesulfurcontentandsulphidetypesintheFCCgasolinewereanalyzedbyaGC2010sulfuranalyzerandaGC-SCDchromatograph.ThetestresultsshowedthatthemoldedHYzeolitewasbetterthantheunmoldedHYzeolite.AtastaticadsorptivedesulfurizationtimeonthemoldedHYzeoliteequatingto6hours,asolid/fuelmassratioof1:3,thesulfurcontentofFCCgasolinewasdecreasedto30ppm,andthedesulfurizationratewasequalto78%.WhenthebreakthroughpointofthemoldedHYwasequalto50ppm,themoldedHYzeolitewascapableofadsorbing4.86mgofsulfurpergramofadsorbent.AndtheregenerationrateofmoldedHYzeolitewasequalto98%.
简介:Thispaperhasinvestigatedtheinfluenceofgasolinesulfurcontentondurabilityofcatalyticconverterforvehicleexhaustgas.Twogasolinesampleswithdifferentsulfurcontents(equatingto150μg/gand50μg/gofsulfur,respectively)wereusedtoexaminethedurabilityandperformanceofcatalyticconverteronthebenchtest.Thetestresultshaverevealedthatincomparisontotheinfluenceofsulfuronageingofcatalyticconverterthethermalageinghadamoreremarkableimpactontheperformanceofcatalyticconverter,andtheperformanceofcatalyticconvertercouldberestoredbyhigh-temperaturedesulfurizationprocessafterageingbythehigh-sulfurgasolinesample(containing150μg/gofsulfur).
简介:为2-propanol/water/ethanediol/KAc系统的咸包含的引得出的蒸馏列和咸包含的代理人恢复列被NRTL模型和修改罗斯松驰方法模仿。模拟结果证明在蒸汽液体平衡和NRTL参数的关联方法(TDCM)的盐效果的预言对说的系统合适。四个不同蒸馏技术过程被调查;结果证明咸包含的引得出的蒸馏过程是最好的。引得出的蒸馏列的模仿的设计在不同全部的阶段数字的条件下面被执行,喂地点,倒流比率,混合代理人的数量和KAc的集中。结果证明象17个阶段,在第9舞台的一个喂的地点,1.2的倒流比率,和喂的一个混合代理人的如此的因素1.141kmol/h评价,最好可能被适合操作条件。模仿的设计也为恢复咸包含的代理人为列被做。咸包含的引得出的蒸馏的模拟方法在这个工作简单、有效。
简介:ThegreenandeffectiveBaeyer-Villigeroxidationreactionofcyclohexanoneforpreparingε-caprolactoneisofparticularimportanceinthesynthesisofnewpolymermaterials.WehavediscussedhereseveralmechanismtypesofBaeyer-VilligeroxidationofcyclohexanonewithH2O2indifferentreactionsystems.Fivemaintypeshavebeenaddressed,i.e.:(1)thenon-catalyzedreactiontype,wheretheC=OofketonesisactivatedbyH+,whichiselectrolyticallydissociatedfromH2O2andH2O,toimprovethecapabilityofC=Ogroupforacceptingtheelectronpairs;(2)thethermallyactivatedradicalreactiontype,wheretheCriegeeintermediateisproducedviatwostepsofradicalreactionwith·OHattack,withmuchmorehydroxylradicalsbeingexcitedinthepresenceofTS-1zeolite;(3)theBrnstedacidcatalysisreactiontype,wherebothO-OmoietyandC=OgroupcouldbeactivatedbyBrnstedacid;(4)thesolidLewisacidcatalyzedC=Oofthesubstrateactivationreactiontypethroughenhancingthedonor-acceptorinteractionbetweentheantibondingπ*C=OorbitalofcyclohexanoneandHOMOofSn-containingzeolites;and(5)thesolidLewisacidcatalyzedH2O2toformMe-OOHoxidativespeciesbyconvertingthehighestoccupiedmolecularorbital(HOMO)ofTi-OOHintoasinglyoccupiedmolecularorbital(SOMO),makingtheO-OgrouphighlyelectrophilictoattacktheC=OofcyclohexanoneduringtheBaeyer-Villigeroxidationprocess.Intheend,wehavealsocomparedthedifferentmechanismsandputforwardouropinionsonthedevelopmentdirectionofcatalyticmaterialsaimingateco-friendlyBaeyer-Villigeroxidationofcyclohexanoneintheyearstocome.
简介:ThekeyscienceandtechnologydevelopmentprojectofSINOPEC—thepilotscalestudyofsyngas-to-ethyleneglycolpackagetechnologyhaspassedtheexpertappraisalsponsoredbytheSINOPECScienceandTechnologyDivision.Thisprojectfacility,whichisjointlydevelopedbytheSINOPECShanghaiPetrochemicalResearchInstitute
简介:Thesupportγ-Al2O3wastreatedwith1-methylnaphthaleneasthemodelreactantbyrespectivelyusingthechemicalstaticadsorptionmethodandtheacceleratedcokingmethodtostudythecokingsitesofγ-Al2O3surface.Thecarbonspeciesformedonγ-Al2O3surfacewereanalyzedbyCAT-CS,TG-MS,IR-OH,andPy-IRtechniques.TheresultsofcharacterizationbyCAT-CSandTG-MStechniquesindicatedthatthecarbonspeciesformedduringthechemicalstaticadsorptionprocessismainlycomposedofthereversiblyadsorbedcokeprecursorswithalowly-condensedstate,whilethatformedaftertheacceleratedcokingprocessisprobablyrelatedwiththeirreversiblyadsorbedcokedepositswithahighly-condensedstate.TheresultsofcharacterizationbyIR-OHandPy-IRtechniquesfurtherimpliedthattheformationofthetwokindsofcarbonspecies,i.e.,cokeprecursorsandcokedeposits,arecloselyrelatedwiththebasichydroxylgroupsandthestrongLewisacidsitesonγ-Al2O3surface.Theresultsleadtoadeepinsightintothecokingmechanismonthealuminasurface.
简介:TheprojectforcommercialapplicationofthesilvercatalystYS-9010attheShanghaiPetrochemicalCompanyhaspassedtheappraisal.Theexpertsattendingtheappraisalmeetinghaveunanimouslyrecognizedthatthistesthasmadeabreakthroughtoattainacatalyticselectivityof90%alongwithprovidingatechnologytoquicklyincreasethecatalystselectivityandshortentheacclimationperiod,makingthecomprehensiveperformanceofthiscatalystcomparabletotheinternationaladvancedlevel.
简介:Thispaperhadinvestigatedtheeffectsofsurfacewettabilityonthefrictionalresistanceofturbulenthorizontalflowfortapwaterinfivepipesmadeofvariousmaterialsandfourkindsofliquidsinapolytetrafluoroethylene(PTFE)pipe,withthesameinnerdiameterof14mm.Pressuredropsweremeasuredunderdifferentflowratesthroughanexperimentalflowloop.Thecontactanglesandadhesionworkofliquidsincontactwithpipesurfacesweredeterminedusingacontactanglemeter.Basedonthedimensionandregressionanalyses,twokindsofmodifiedrelationshipsbetweenthefrictionalcoefficientandthesurfacewettabilitywereestablishedaccordingtothemeasuredresultscorrespondingtotapwaterinfivepipesandfourliquidsinPTFEpipe.Theexperimentalresultsshowthatthesurfacewettabilityhassomeinfluenceonfrictionalcoefficientofthestudiedliquidsflowinginmacroscalepipes,andthefrictionalcoefficientdecreaseswiththeincreaseofthecontactangleatthesameReynoldsnumber.Meanwhiletheeffectofwettabilityonthehydrophobicsurfaceisgreaterthanthatonthehydrophilicone.Thefrictionalcoefficientspredictedbythemodifiedformulashaveverifiedtobeingoodagreementwiththeexperimentalvalues,therelativeerrorsofwhicharewithin±6%and±3%forthetapwaterflowinginfivedifferentpipesandfourkindsofliquidsflowinginPTFEpipe,respectively.
简介:TheMoS2catalystswerepreparedfromvariousmolybdateprecursorsincludinginorganicandorganicmolybdatecompounds.ThesulfidationdegreeandmorphologyofactivephasesofMoS2activatedbyvariousmolybdateprecursorsinH2S/H2streamatdifferenttemperatureswerestudiedbyX-rayphotoelectronspectroscopy(XPS)andhigh-resolutiontransmissionelectronmicroscopy(HRTEM).TheorganicmolybdateprecursorsleadtoMoS2catalystswithhighersulfidationdegreeandsmalleractivephasestodemonstratehighercatalyticactivityduringhydrodesulfurizaiton(HDS)of4,6-DMDBT.
简介:SZorbadsorptivedesulfurizationtechnologyisofgreatsignificanceontheproductionofcleangasolineinChina,buttheformationofZn2SiO4duringtheoperationinsorbentswouldbringforthnegativeimpactsonthedesulfurizationperformanceandthestabilityoftheprocessingunit.Byusingthein-situTPO,XRD,andIRtechniquestostudythemechanismofZn2SiO4formationunderoperatingconditions,itwasfoundthatthecoexistenceofacidandhydrothermalconditionscouldacceleratetheformationofZn2SiO4.Moreover,thestudyofZn2SiO4inhibitionmethodindicatedthatthedecreaseofoxygenconcentrationinregenerationgaswouldinhibittherateofZn2SiO4formation,andtheregenerationofZnSwouldtakeplaceinamildregenerationcondition.
简介:ThemesoporousAl-SBA-15zeolitewasobtainedviaimpregnationofpuresilica-basedSBA-15zeolitewithaluminumnitrate.TheAl-SBA-15samplewascalcinedinairat800℃for6handhydrothermallytreatedatnear100℃for120h,respectively,andthenthethermalandhydrothermalstabilityofAl-SBA-15samplewasinvestigatedbyX-raydiffractometry(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM)andnitrogenadsorptionanddesorptiontechniques.TheAl-SBA-15samplewasalsostudiedby27Alnuclearmagneticresonance(27AlNMR)andammoniatemperatureprogrammeddesorption(NH3-TPD)techniques.Inaddition,thecatalyticactivityofAl-SBA-15zeolitewasinvestigatedbytheFriedel-Craftsreactionsof2,4-di-tert-butylphenolwithcinnamylalcohol.ThetestresultsshowedthatthethermalandhydrothermalstabilityofAl-SBA-15zeolitewasbetterthanthatofSBA-15zeo-lite.TheAl-SBA-15zeolitesamplepreparedbyimpregnationmethodexhibitsmoreframeworkaluminumspeciesandAl-O-Siunits.Therefore,thenumberofthesurfacehydroxylgroupswasreduced,resultinginthestabilizationofframeworkstructureofAl-SBA-15zeolite.Thealuminumspeciescanformweakandmedium-strongacidsiteswithcatalyticactivity.
简介:SixNi-MocatalystswithdifferentmetalcontentswerepreparedandcharacterizedbyN2adsorptionandX-raydiffractometry.TheactivephasemicrostructureofthesecatalystswasexaminedbytheRamanspectroscopy,temperatureprogrammedreduction(TPR),X-rayphotoelectronspectroscopy,andhigh-resolutiontransmissionelectronmicroscopy.Hydrodesulfurization(HDS)activityofcatalystsampleswereanalyzedinaflowfixed-bedmicroreactor.ThesulfidationdegreeofMoandthelengthoftheMoS2slabslightlyincreasedwiththeamountofmetalloadedfollowingsulfidation.Thissmallchangeisattributedtopolymolybdatespeciesobservedinalltheoxidizedcatalysts.Weakmetal-supportinteractions,asdeterminedbytheTPRtechnique,increasedtheNiSxsulfidationphaseandMoS2slabstacking.TheHDSactivityofthecatalystsamplesincreasedwiththenumberofactivesites.Forhighmetalloadingcatalysts,theirHDSactivitywasnearlyidenticalbecausethesulfuratomscannoteasilyapproachactivesites.ThischangeiscausedbythelargenumberofstackedlayersintheMoS2slabsaswellasthedecreaseinthespecificsurfaceareaandporevolumeofthecatalystsampleswithanincreasingmetalloading.
简介:<正>TherulesofMIPreactionsforcatalyticcrackingofsulfurcompoundsanditsinfluenceonthesulfurcontentintheMIPnaphthawerestudied.ThemamfactorsinfluencingthesulfurcontentintheMIPnaphthawerethoughttobethesulfurcontentoffeedstockandwerecloselyrelatedwiththeolefincontentofnaphtha.TakingintoaccountthecharacteristicfeaturesofMIPprocess,themethodsforreducingthesulfurcontentintheMIPnaphthawerecomprisedofdecreasingthesulfurcontentoffeedstockbyhydrotreatinganddecreasingtheolefincontentofnaphthathroughpromotinghydrogentransferreactions.Therefore,theEuroⅣcleangasolinewithlowsulfurcontentandlowolefincontentcouldbeobtaineddirectlythroughtheMIPtechnology.