简介:W,N共同做TiO2nanoparticles被一个solgel方法综合。准备样品被X光检查衍射(XRD)描绘,域排放扫描电子显微镜学(FE-SEM),传播电子显微镜学(TEM),Fourier变换红外线的光谱学(英尺红外),X光检查光电子光谱学(XPS)和弥漫的反射spectrophotometry(医生)。结果证明共同做的光催化剂是有22.5nm的最小的粒子尺寸的实质上一致的球形的粒子。比作未做的TiO2,N-TiO2和P-25,W的吸收边,N共同做转移到更长的波长的TiO2和它为在Xe灯(350W)下面的甲基橘子(瞬间)的降级的photocatalytic活动更高。
简介:一系列碳nanotubes/TiO2nanotubes(CNTs/TNTs)合成光催化剂被CNT的加入成功地在HNO3洗准备过程。分别地,这些光催化剂被XRD,N2物理吸附,UVvis弥漫的反射光谱学,TEM和拉曼光谱学描绘,他们的photocatalytic活动被把methy1橘子(瞬间)用作模型混合物测试。另外,合并的CNT的数量的效果,锻烧温度和在合成光催化剂的photocatalytic活动的催化剂的数量系统地被调查。结果证明CNTs/TNTs合成展览高得多的photocatalytic活动比TNT或CNT的独自一个。
简介:这份报纸为为敏化染料的太阳能电池(DSSC)经由一起沉淀为TiO2nanoparticles准备建模并且优化作为一条有效途径论述反应表面方法论(RSM)性能。钛(IV)二度--(acetylacetonate)di-isopropoxide(DIPBAT),isopropanol和水分别地被用作先锋,溶剂和合作溶剂。象准备因素与的水,老化温度和锻烧温度的臼齿的比率主要并且粒子特征和表演上的相互作用效果被调查。粒子特征被X光检查diffractometry(XRD)以主要、第二等的尺寸,晶体取向和形态学决定并且扫描电子显微镜学(SEM)。乐队差距精力和DSSC的力量变换效率被用于表演研究。根据在反应表面方法论(RSM)的变化(ANOVA)的分析,所有三个独立参数是统计上重要的,最后的模型是精确的。模型在1:10:500的DIPBAT-to-isopropanol-to-water的臼齿的比率的最佳的条件下面预言了最大的力量变换效率(0.14%),变老36潰獳獥楳湯的温度吗?
简介:TiO2@ZrO2@Y2O3:有coremultishell结构的Eu3+合成粒子通过layer-by-layer(LBL)的联合被综合自己组装方法和一个solgel过程。获得的样品与扫描电子被描绘显微镜学(SEM),传播电子显微镜学(TEM),X光检查光电子光谱学(XPS),X光检查衍射(XRD),和荧光spectrophotometry。结果证明合成粒子有coremultishell结构,球形的形态学,和狭窄的尺寸分布。TiO2核心上的ZrO2层的存在能有效地阻止在TiO2核心和Y2O3壳之间的反应;为在在TiO2@ZrO2@Y2O3的TiO2核心和Y2O3壳之间的反应的温度:Eucoremultishell黄磷能被300提高
简介:Inthiswork,syngasmethanationoverNi-W/TiO2-SiO2catalystwasstudiedinafluidized-bedreactor(FBR)anditsperformancewascomparedwithafixed-bedreactor(FIXBR).Theeffectsofmainoperatingvariablesincludingfeedstockgasesspacevelocity,cokecontent,bedtemperatureandsulfur-tolerantstabilityof100hlifewereinvestigated.ThestructureofthecatalystswascharacterizedbyXRD,N2adsorptiondesorptionandTEM.Itisfoundthatundersamespacevelocityfrom5000h1to25000h1FBRgaveahigherCH4yield,lowercokecontent,andlowerbedtemperaturethanthoseobtainedinFIXBR.Ni-W/TiO2-SiO2catalystpossessedexcellentsulfur-tolerantstabilityonthefeedstockgaseslessthan500ppmH2SinFBR.ThecarbondepositsformedonthespentcatalystwereintheformofcarbonfibersinFBR,whileintheformofdenseaccumulationdistributionappearanceinFIXBR.
简介:测量了ZnO-TiO2-Bi2O3-CuO-Co2O3,ZnO-TiO2-Bi2O3-CuO-Cr2O3,ZnO-TiO2-Bi2O3-CuO-MnO2和ZnOTiO2-Bi2O3-CuO-MnO2-Co2O3-Cr2O3压敏陶瓷的正电子寿命谱及其电性能参数。研究了MnO2、Co2O3和Cr2O3掺杂对ZnO-TiO2-Bi2O3-CuO压敏陶瓷电子密度和电性能的影响。实验发现:ZnO-TiO2-Bi2O3-CuOCr2O3压敏陶瓷基体和晶界缺陷态的电子密度均最高,其压敏电压最低;ZnO-TiO2-Bi2O3-CuO-MnO2压敏陶瓷晶界缺陷态的电子密度最低,其压敏电压比前者高;ZnO-TiO2-Bi2O3-CuO-Co2O3压敏陶瓷基体(晶粒内)的电子密度最低,其压敏电压较高;而ZnO-TiO2-Bi2O3-CuO-MnO2-Co2O3-Cr2O3压敏陶瓷基体和晶界缺陷态的电子密度均较低,其压敏电压VT和非线性系数ɑ最高,漏电流IL最小。
简介:AsimplespectrophotometricassayofH2O2andglucoseusingAgnanoparticleshasbeencarriedout.RelyingonthesynergisticeffectofH2O2reductionandultraviolet(UV)irradiation,Agnanoparticleswithenhancedabsorptionsignalsweresynthesized.H2O2servedasareducingagentintheAgnanoparticlesformationinwhichAg+wasreducedtoAg0byO2àgeneratedviathedecompositionofH2O2inalkalinemedia.Ontheotherhand,photoreductionofAg+toAg0underUVirradiationsalsocontributedtothenanoparticlesformation.ThesynthesizednanoparticleswerecharacterizedbyTEM,XPS,andXRD.TheproposedmethodcoulddetermineH2O2withconcentrationsrangingfrom5.010à7to6.010à5mol/L.Thedetectionlimitwasestimatedtobe2.010à7mol/L.SincetheconversionofglucosetogluconicacidcatalyzedbyglucoseoxidasewascompaniedwiththeformationofH2O2,thesensingprotocolhasbeensuccessfullyutilizedforthedeterminationofglucoseinhumanbloodsamples.Theresultswereingoodagreementwiththosedeterminedbyalocalhospital.Thiscolorimetricsensorthusholdsgreatpromisesinclinicalapplications.
简介:Ahighlyeffcientandgeneralmethodforthesynthesisofpolyfunctionalized4H-pyransisestablishedthroughaone-potmulticomponentcyclocondensationofaromaticaldehydeswithCHacids,malononitrileandethylacetoacetateusingnanosilicasupportedtin(II)chlorideasacatalyst.InthismethodSnCl2/nanoSiO2wasusedasgreenandreusablecatalyst.Excellentyields,shortreactiontimes,simpleworkup,andinexpensivenessandcommerciallyavailabilityofthecatalystaretheadvantagesofthismethod.
简介:ThecorrelationbetweenphasestructuresandsurfaceacidityofAl2O3supportscalcinedatdifferenttemperaturesandthecatalyticperformanceofNi/Al2O3catalystsintheproductionofsyntheticnaturalgas(SNG)viaCOmethanationwassystematicallyinvestigated.Aseriesof10wt%NiO/Al2O3catalystswerepreparedbytheconventionalimpregnationmethod,andthephasestructuresandsurfaceacidityofAl2O3supportswereadjustedbycalciningthecommercialγ-Al2O3atdifferenttemperatures(600–1200C).COmethanationreactionwascarriedoutinthetemperaturerangeof300–600Catdifferentweighthourlyspacevelocities(WHSV=30000and120000mL·g-1h-1)andpressures(0.1and3.0MPa).ItwasfoundthathighcalcinationtemperaturenotonlyledtothegrowthinNiparticlesize,butalsoweakenedtheinteractionbetweenNinanoparticlesandAl2O3supportsduetotherapiddecreaseofthespecificsurfaceareaandacidityofAl2O3supports.Interestingly,NicatalystssupportedonAl2O3calcinedat1200C(Ni/Al2O3-1200)exhibitedthebestcatalyticactivityforCOmethanationunderdifferentreactionconditions.LifetimereactiontestsalsoindicatedthatNi/Al2O3-1200wasthemostactiveandstablecatalystcomparedwiththeotherthreecatalysts,whosesupportswerecalcinedatlowertemperatures(600,800and1000C).ThesefindingswouldthereforebehelpfultodevelopNi/Al2O3methanationcatalystforSNGproduction.