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简介：Mixedalcoholisofgreatpromiseasoctaneimproverinautomotivefuel,andhopefultoreplacetheMTBEtoreducetheenvironmentalpollution,Inthisfield,alkali-promtedmolybdenum-basedcatalystshavebeengivenspecialinterestbecauseoftheirexcellentsulfur-toleranceforsynthesisofmixedalcoholfromCO+H2,Itwasreportedthatthecoblatisafavorablepromoterforenhancingalcoholproduction,especiallyforimprovingtheselectivityforC2+alcohol[1-3],moreover,stronginteractionbetweenConandMoisinfavorofmixedalcoholsynthesis[4].Recently,weprparedakindofK-Co-Moultrafineparticlesbysol-gelmethodanditshowsmuchsmallerparticlesizebuthigheractivtyandselectivitytowardalcoholformationthantheonepreparedbyconventionalmethod[5],TheaimofthepresentworkistoresearchthemicostructuresoftheMoandCospeciesintheK-Co-Mosamplespreparedbydifferentmethod.

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简介：AseriesofMo-impregnatedHβsamples,withMoO3loadinginHβzeoliteinthemassfractionrangeof0.5%-6.0%,werestudiedbymeansofXRDandIRinordertocharacterizetheirstructures.Mo/Hβsampies'crystallinityalmostlinearlydecreaseswithincreasingtheamountofMoO3loaded,TheIRspectraandXRDpatternssuggestthattheprogressivedestabilizationoftheHβzeolitestructureiscausedbyincreasingMoloadingin(MoO3+Hβzeolite).Duringthecalcination,Al2(MoO4)3formedfromthedealuminationofHβzeolite,causesthesubstantiallypartialbreakdownofthezeoliteframeworkwhentheMoloadinginMoO3+Hβisrelativelyhigh.

简介：Ｎｉ／Ｍｏ２ＮａｓａＨｉｇｈｌｙＡｃｔｉｖｅＨｙｄｒｏｄｅｎｉｔｒｏｇｅｎａｔｉｏｎＣａｔａｌｙｓｔＮｉ／Ｍｏ２ＮａｓａＨｉｇｈｌｙＡｃｔｉｖｅＨｙｄｒｏｄｅｎｉｔｒｏｇｅｎａｔｉｏｎＣａｔａｌｙｓｔ￥ＷｅｎＹｕＺＨＡＮＧ；ＸｉｎＰｉｎｇＷＡＮＧ；...

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简介：IntroductionIn2O3·Snfilmshavehightransparency（>95％）withinthevisiblespectralregion,lowresistivity(10-2—10-4ohm·cm)atroomtemperatureandsuperiorthermalstability.Thesefilmshavebeenappliedtosolarcells,electronicsandphotoelectronicsfields.Inrecentyears,organometallic-CVDmethodhasemergedasasuccessfulalternatetothephysicalmethodsandgeneralCVDforthegrowthofthesefilms.TheMO-CVDtech-

简介：TheevaluationofcreepdamagesofCr-Mo-Vsteelusedinthegasturbineofpowerplanthasbeencarriedoutusingtheline-focus-beam(LFB)acousticmicroscopy.Thevelocityofleakysurfaceacousticwave(LSAW)propagatednearthespecimensurfacewasusedforthequantitativeevaluations,whichwasmeasuredbyLFBacousticmicroscopyusingthev(z)curveanalysismethod.IthasbeenshownthatwiththeincreaseofcreepdamagefractionofmetalmaterialtheLSAWvelocitydecreasesobviously,whichsuggeststhepossibilityofnondestructiveandquantitativeevaluationsofcreeddamagesinmetalmaterialsbyacousticmicroscopy.

简介：取适量金属铀（含95％^235U）封装在石英安焙瓶中，水煮检漏。将封装有^235U的安焙瓶置于铝筒中，氩弧焊焊接，氦质谱检漏仪对铝筒检漏。检漏合格后，在中子注量率为2×10^13cm^-2·s^-1的条件下照射适当的时间，冷却5～7d。将辐照冷却后的^235U经浓硝酸溶解，同时释放出^131I，^85和^133Xe。

简介：Wehaveinvestigatedthelow-lyingcollectivestatesandelectromagnetictransitionsin94Mowithintheframeworkoftheinteractingbosonmodel.Theinfluenceofmodelparametersontheenergylevelsandelectromagneticpropertieshasbeeninvestigated.Theanalysisoftheobtainedresultsandtheparametervaluespredictthatthe23+stateisthelowestmixedsymmetrystatewithpureF=Fmax-1inthisnucleus.Thecalculatedresultspredicatethatthe25+(two-Q-phonon)mixedsymmetrystateisclosedtotheJ=2+at2.870MeVintheexperimentaldata,andthe2.965MeVstateisthelowestmixedsymmetrywithJ=3+.

简介：NanocrystallineNi-Mo-Fealloydepositswereobtainedbyelectrodeposition.ThestructuresofthealloydepositswereanalyzedbyX-raydiffraction(XRD)andX-rayphotoelectronspectroscopy(XPS).TheXRDresultsofnanocrystallineNi-Mo-Fealloydepositshowthatmanydiffractionlinesdisappear,andthatthereisonlyonediffractionpeakat44.0°.TheXPSresultsofnanocrystallineNi-Mo-Fealloydepositsindicatethatthenickel,molybdenumandironofthedepositsexistinmetallicstate,andthatthebindingenergyofthealloyedelementsincreasestosomeextent.ThenanocrystallineNi-Mo-FealloydepositelectrodemayofferbetterelectrocatalyticactivitythanthepolycrystallinenickeleletrodeandthenanocrystallineNi-Moalloyelectrode.TheelectrochemicalimpedancespectrafromthenanocrystallineNi-Mo-Fealloyelectrodeindicatethathydrogenevolutionin30%(m/m)KOHatloweroverpotentialisinaccordancewiththeVolmer-Tafelmechanism,butwiththeVolmer-Heyrovskymechanismathigheroverpotential.

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简介：Effectsofspacevelocity,reactiontemperatureandsupportacidityonproductdistributionandinductionperiodin1-buteneisomerizationandmetathesisoverMo/mordenite-aluminawereinvestigated.Asrevealedbythecatalyticperformanceresults,inductionperiodandobjectiveproductwerecloselyrelatedtothereactionconditions.Lowerspacevelocityledtolongerinductionperiodandhigherpropeneyield.Theoptimalreactiontemperatureforpropeneproductionisaround150Canditshiftedto100Cforetheneproduction.1-Buteneauto-metathesispredominatedinthereactionnetworkifthesupportwithlowerdegreeofsodiumexchanged.Andpropenegraduallybecamethedominantproductuponincreasingthesupportsodiumexchangedegree.6Mo/H100Na0M-30Alcatalystwithasupportoffullsodiumexchangedegreeexhibitedthehighestpropeneyield.

简介：IncorporationofstrontiumintoV-Moalumina-supportedcatalystenhanceditsperformance(increasedconversionandselectivity,decreasedreducibilityandimprovedstability)inpropaneoxydehydrogenationtopropylene.12.5%SrloadingwasshowntobetheoptimumcontenttotheV-Mocatalyst.Theresultsweresupportedbyvariouscharacterizationtechniques,namely,BET,XRD,SEM,FTIRandTPD.

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