Kawm txog cov synthesis thiab hloov khoCerium oxide nanomaterials
Lub synthesis ntawmCeria nanomaterialssuav nrog nag lossis daus, coprecipitation, hydrothermal, mechanical synthesis, combustion synthesis, sol gel, micro lotion thiab pyrolysis, uas cov txheej txheem tseem ceeb yog nag lossis daus thiab hydrothermal. Hydrothermal txoj kev yog suav hais tias yog qhov yooj yim tshaj plaws, kev lag luam zoo tshaj plaws, thiab ntxiv cov txheej txheem dawb. Qhov kev sib tw tseem ceeb ntawm txoj kev hydrothermal yog los tswj cov nanoscale morphology, uas yuav tsum tau ua tib zoo hloov kho los tswj nws cov yam ntxwv.
Kev hloov kho ntawmceriatuaj yeem txhim kho los ntawm ob peb txoj hauv kev: (1) doping lwm cov hlau ions nrog cov nqi qis dua los yog qhov me me hauv ceria lattice. Txoj kev no tuaj yeem tsis tsuas yog txhim kho kev ua haujlwm ntawm cov hlau oxides koom nrog, tab sis kuj tsim cov ntaub ntawv ruaj khov tshiab nrog cov khoom tshiab thiab cov khoom siv tshuaj. (2) Disperse ceria los yog nws cov doped analogues rau cov khoom nqa khoom tsim nyog, xws li cov pa roj carbon activated, graphene, thiab lwm yam.Cerium oxidekuj tseem tuaj yeem ua tus cab kuj rau dispersing hlau xws li kub, platinum, thiab palladium. Kev hloov kho ntawm cov khoom siv cerium dioxide feem ntau yog siv cov hlau hloov pauv, cov hlau tsis tshua muaj alkali / alkali hauv ntiaj teb, cov hlau tsis tshua muaj hauv ntiaj teb, thiab cov hlau muaj txiaj ntsig, uas muaj kev ua haujlwm zoo dua thiab thermal stability.
Daim ntawv thov ntawmCerium Oxidethiab Composite Catalysts
1, Daim ntawv thov sib txawv morphologies ntawm ceria
Laura et al. qhia txog kev txiav txim siab ntawm peb hom ceria morphology theem daim duab, uas cuam tshuam cov teebmeem ntawm alkali concentration thiab hydrothermal kev kho kub mus rau qhov kawg.CeO 2nanostructure morphology. Cov txiaj ntsig qhia tau hais tias qhov kev ua haujlwm catalytic ncaj qha cuam tshuam nrog Ce3 + / Ce4 + piv thiab qhov chaw oxygen qhov chaw nyob qhov siab. Wei et al. synthesized peb Pt /CeO 2catalysts nrog txawv cab kuj morphologies (qws zoo li (CeO 2-R), kub (CeO 2-C), thiab octahedral (CeO 2-O), uas yog tshwj xeeb tshaj yog haum rau low-temperature catalytic oxidation ntawm C2H4. Bian et al. npaj ib tug series ntawmCeO2 nanomaterialsnrog pas nrig-zoo li tus, cubic, granular, thiab octahedral morphology, thiab pom tias catalysts loaded rauCeO2 nanoparticles(5Ni / NPs) nthuav tawm ntau dua catalytic kev ua haujlwm thiab kev ruaj ntseg zoo dua li cov catalysts nrog rau lwm cov ntaub ntawv ntawmCeO 2kev txhawb nqa.
2.Catalytic degradation ntawm cov pa phem hauv dej
Cerium oxidetau raug lees paub tias yog ib qho zoo ozone oxidation catalyst rau kev tshem tawm ntawm cov organic tebchaw xaiv. Xiao et al. pom tias Pt nanoparticles nyob ze nrogCeO 2nyob rau ntawm qhov chaw catalyst thiab muaj kev sib cuam tshuam zoo, yog li txhim kho cov kev ua haujlwm ntawm ozone decomposition thiab tsim ntau cov pa oxygen reactive, uas ua rau oxidation ntawm toluene. Zhang Lanhe thiab lwm tus tau npaj dopedCeO 2/Al2O3 catalysts. Doped hlau oxides muab qhov chaw tshuaj tiv thaiv rau cov tshuaj tiv thaiv ntawm cov organic tebchaw thiab O3, ua rau muaj kev ua tau zoo dua catalytic ntawmCeO 2/Al2O3 thiab nce hauv qhov chaw nquag ntawm cov catalyst nto
Yog li ntawd, ntau txoj kev tshawb fawb tau qhia tiascerium oxideComposite catalysts tsis tau tsuas yog txhim kho qhov degradation ntawm recalcitrant organic micro pollutants nyob rau hauv lub tshav pob ntawm catalytic ozone kho cov dej khib nyiab, tab sis kuj muaj inhibitory cuam tshuam rau cov bromate uas tsim thaum lub sij hawm ozone catalytic txheej txheem. Lawv muaj kev thov dav dav hauv kev kho dej ozone.
3, Catalytic degradation ntawm volatile organic tebchaw
CeO 2, raws li ib qho tsis tshua muaj lub ntiaj teb oxide, tau kawm nyob rau hauv multiphase catalysis vim nws lub peev xwm oxygen siab.
Wang et al. synthesized Ce Mn composite oxide nrog ib tug pas nrig-shaped morphology (Ce / Mn molar ratio ntawm 3: 7) siv txoj kev hydrothermal. Mn ions tau doped rau hauvCeO 2lub moj khaum los hloov Ce, yog li ua kom cov concentration ntawm oxygen vacancies. Raws li Ce4+ yog hloov los ntawm Mn ions, ntau cov pa oxygen vacancies raug tsim, uas yog vim li cas rau nws cov hauj lwm siab dua. Du et al. synthesized Mn Ce oxide catalysts siv ib txoj kev tshiab combining redox nag lossis daus thiab hydrothermal txoj kev. Lawv pom tias qhov piv ntawm manganese thiabceriumua lub luag haujlwm tseem ceeb hauv kev tsim cov catalyst thiab cuam tshuam nws cov kev ua tau zoo thiab kev ua haujlwm catalytic.Ceriumhauv manganesecerium oxideplays lub luag haujlwm tseem ceeb hauv adsorption ntawm toluene, thiab manganese tau pom tias ua lub luag haujlwm tseem ceeb hauv oxidation ntawm toluene. Kev sib koom tes ntawm manganese thiab cerium txhim kho cov txheej txheem catalytic.
4.Photocatalyst
Sun et al. ua tiav kev npaj Ce Pr Fe-0 @ C siv txoj kev los nag lossis daus. Cov txheej txheem tshwj xeeb yog tias doping tus nqi ntawm Pr, Fe, thiab C ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm photocatalytic. Qhia tus nqi tsim nyog ntawm Pr, Fe, thiab C rau hauvCeO 2tuaj yeem txhim kho qhov kev ua tau zoo ntawm photocatalytic ntawm cov qauv tau txais, vim tias nws muaj qhov zoo dua adsorption ntawm cov pa phem, kev nqus tau zoo dua ntawm cov teeb pom kev zoo, kev tsim cov pa roj carbon ntau dua, thiab cov pa oxygen ntau dua. Cov kev ua kom zoo photocatalytic ntawmCeO 2-GO nanocomposites npaj los ntawm Ganesan li al. yog ntaus nqi los txhim kho thaj tsam ntawm qhov chaw, qhov nqus nqus, nqaim bandgap, thiab cov teebmeem photoresponse. Liu et al. pom tias Ce/CoWO4 composite catalyst yog ib qho zoo photocatalyst nrog rau daim ntawv thov nqi. Petrovic et al. npajCeO 2catalysts siv qhov tam sim no electrodeposition txoj kev thiab hloov lawv nrog tsis thermal atmospheric siab pulsating corona plasma. Ob qho tib si plasma hloov kho thiab tsis hloov cov ntaub ntawv muaj peev xwm catalytic zoo hauv cov txheej txheem plasma thiab photocatalytic degradation.
Xaus
Kab lus no tshuaj xyuas qhov cuam tshuam ntawm cov txheej txheem synthesis ntawmcerium oxidentawm particle morphology, lub luag hauj lwm ntawm morphology ntawm cov khoom nto thiab catalytic kev ua, nrog rau cov nyhuv synergistic thiab daim ntawv thov ntawmcerium oxidethiab dopants thiab carriers. Txawm hais tias cerium oxide raws li catalysts tau kawm dav thiab siv rau hauv thaj chaw ntawm catalysis, thiab tau ua kom muaj kev vam meej hauv kev daws teeb meem ib puag ncig xws li kev kho dej, tseem muaj ntau yam teeb meem, xws li tsis meej.cerium oxidemorphology thiab loading mechanism ntawm cerium txhawb catalysts. Kev tshawb fawb ntxiv yog xav tau ntawm cov txheej txheem synthesis ntawm cov catalysts, txhim kho cov nyhuv synergistic ntawm cov khoom, thiab kawm txog cov txheej txheem catalytic ntawm cov khoom sib txawv.
Tus sau phau ntawv xov xwm
Shandong Ceramics 2023 Qhov Teeb Meem 2: 64-73
Sau: Zhou Bin, Wang Peng, Meng Fanpeng, thiab lwm yam
Post lub sij hawm: Nov-29-2023