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溶胶凝胶法制备的银硅催化剂的优化与其在草酸二甲酯加氢制乙醇酸甲酯中的应用.docx

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溶胶凝胶法制备的银硅催化剂的优化与其在草酸二甲酯加氢制乙醇酸甲酯中的应用 Title:OptimizationofSilver-SilicaCatalystPreparedbySol-GelMethodanditsApplicationinHydrogenationofDimethylOxalatetoEthylGlycolate Abstract: Catalysisplaysacrucialroleinthechemicalindustryforenhancingreactionratesandselectivity.Thedevelopmentandoptimizationofefficientcatalystsareessentialtoimprovethereactionefficiencyandreduceenergyconsumption.Inthisstudy,wefocusontheoptimizationofasilver-silica(Ag-SiO2)catalystpreparedbythesol-gelmethodanditsapplicationinthehydrogenationofdimethyloxalate(DMO)toethylglycolate(EG). Keywords:sol-gelmethod,silver-silicacatalyst,optimization,hydrogenation,dimethyloxalate,ethylglycolate 1.Introduction Catalytichydrogenationprocessesarewidelyusedintheproductionofvariouschemicals.Theconversionofdimethyloxalate,abyproductofthesynthesisofdimethylsulfate,toethylglycolateisanessentialreactioninthechemicalindustry.Thetraditionalcatalystsusedforthisreaction,suchascopper-basedcatalysts,sufferfromlowselectivityandlimitedstability.Therefore,thedevelopmentofefficientcatalystswithhighselectivityandstabilityisofgreatimportance. 2.PreparationandCharacterizationofAg-SiO2Catalyst Thesol-gelmethodisaversatileandpopulartechniqueforthesynthesisofheterogeneouscatalysts,allowingprecisecontrolofthecatalyst'sstructureandproperties.Inthisstudy,theAg-SiO2catalystwaspreparedbythesol-gelmethodusingtetraethylorthosilicateandsilvernitrateasprecursors.Theeffectofvarioussynthesisparameters,includingthemolarratioofprecursors,pH,andcalcinationtemperature,onthecatalyst'sperformancewassystematicallyinvestigated.ThecatalystwascharacterizedusingX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),andBrunauer-Emmett-Teller(BET)analysistodetermineitscrystallinestructure,morphology,andsurfacearea. 3.OptimizationofAg-SiO2Catalyst TheoptimizationoftheAg-SiO2catalystinvolvedadjustingthesynthesisparameterstoimproveitscatalyticactivity,selectivity,andstability.Theeffectsofthemolarratioofprecursors,pH,andcalcinationtemperatureonthecatalyst'sperfor