Cov kws tshawb fawb ntawm Tokyo Institute of Technology tau qhia tias cov tooj liab oxide nyob rau ntawm cov sub-nanoscale yog cov catalysts muaj zog dua li cov nyob hauv nanoscale.Cov subnanoparticles no tseem tuaj yeem ua rau oxidation cov tshuaj tiv thaiv ntawm cov pa roj carbon monoxide muaj txiaj ntsig zoo dua li cov catalysts tam sim no siv hauv kev lag luam.Txoj kev tshawb no nthuav dav txoj hauv kev kom tau txais txiaj ntsig zoo dua thiab siv tau zoo ntawm cov pa roj carbon monoxide, uas yog cov ntaub ntawv tseem ceeb rau kev tshawb fawb thiab kev lag luam.

Kev xaiv oxidation ntawm hydrocarbons yog ib qho tseem ceeb hauv ntau cov tshuaj tiv thaiv thiab cov txheej txheem kev lag luam, thiab yog li ntawd, cov kws tshawb fawb tau saib xyuas txoj hauv kev zoo dua los ua qhov no oxidation.Copper oxide (CunOx) nanoparticles tau pom muaj txiaj ntsig zoo li cov khoom siv rau kev ua cov tshuaj tsw qab hydrocarbons, tab sis qhov kev tshawb nrhiav ntawm cov tshuaj muaj txiaj ntsig zoo dua tau txuas ntxiv mus.

Nyob rau yav dhau los tsis ntev los no, cov kws tshawb fawb tau siv noble hlau-raws li catalysts uas muaj cov khoom ntawm sub-nano theem.Nyob rau theem no, cov khoom ntsuas tsawg dua li nanometer thiab thaum muab tso rau ntawm qhov tsim nyog substrates, lawv tuaj yeem muab cov cheeb tsam ntau dua li cov nanoparticle catalysts los txhawb kev ua haujlwm.

Nyob rau hauv cov qauv no, ib pab neeg ntawm cov kws tshawb fawb suav nrog Prof. Kimihisa Yamamoto thiab Dr. Makoto Tanabe los ntawm Tokyo Institute of Technology (Tokyo Tech) tau tshawb xyuas cov tshuaj tiv thaiv kab mob catalyzed los ntawm CunOx subnanoparticles (SNPs) los ntsuas lawv cov kev ua tau zoo hauv oxidation ntawm aromatic hydrocarbons.CunOx SNPs ntawm peb qhov ntau thiab tsawg (nrog 12, 28, thiab 60 tooj liab atoms) tau tsim nyob rau hauv cov qauv ntoo zoo li hu ua dendrimers.Kev txhawb nqa ntawm zirconia substrate, lawv tau thov rau aerobic oxidation ntawm cov organic compound nrog ib lub nplhaib benzene.

X-ray photoelectron spectroscopy (XPS) thiab infrared spectroscopy (IR) tau siv los txheeb xyuas cov qauv ntawm SNPs, thiab cov txiaj ntsig tau txais kev txhawb nqa los ntawm kev suav ua haujlwm ceev (DFT).

Kev tsom xam XPS thiab DFT suav nrog tau qhia txog kev nce ionicity ntawm tooj liab-oxygen (Cu-O) daim ntawv cog lus raws li SNP loj zuj zus.Qhov no daim ntawv cog lus polarization tau ntau dua qhov pom nyob rau hauv tej Cu-O daim ntawv cog lus, thiab cov polarization ntau dua yog qhov ua rau muaj kev txhim kho catalytic ntawm CunOx SNPs.

Tanabe thiab cov neeg koom tes tau pom tias CunOx SNPs tau nce oxidation ntawm CH3 pawg txuas nrog lub nplhaib uas muaj ntxhiab, yog li ua rau cov khoom tsim.Thaum CunOx SNP catalyst tsis tau siv, tsis muaj cov khoom tsim.Cov catalyst nrog qhov tsawg tshaj plaws CunOx SNPs, Cu12Ox, muaj qhov zoo tshaj plaws catalytic kev ua tau zoo thiab ua pov thawj tias qhov ntev tshaj plaws.

Raws li Tanabe piav qhia, "kev txhim kho ntawm ionicity ntawm Cu-O daim ntawv cog lus nrog txo qhov loj ntawm CunOx SNPs ua rau lawv cov kev ua kom zoo dua catalytic rau aromatic hydrocarbon oxidation."

Lawv cov kev tshawb fawb txhawb kev sib cav hais tias muaj peev xwm zoo rau kev siv tooj liab oxide SNPs ua catalysts hauv cov ntawv thov kev lag luam."Qhov kev ua tau zoo catalytic thiab cov txheej txheem ntawm cov kev tswj xyuas qhov loj me ntawm CunOx SNPs yuav zoo dua li cov khoom siv hluav taws xob zoo, uas feem ntau siv hauv kev lag luam tam sim no," Yamamoto hais, hinting ntawm CunOx SNPs tuaj yeem ua tiav yav tom ntej.

Cov ntaub ntawv muab los ntawm Tokyo Institute of Technology.Nco tseg: Cov ntsiab lus tuaj yeem hloov kho rau style thiab ntev.

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