Iingcali zenzululwazi kwiTokyo Institute of Technology ziye zabonisa ukuba i-copper oxide particles kwi-sub-nanoscale yi-catalysts enamandla kunezo kwi-nanoscale.Ezi subnanoparticles zisenokwenza i-oxidation reactions ye-aromatics hydrocarbons isebenze kakhulu ngakumbi kune-catalysts esetyenziswa ngoku kwishishini.Olu phononongo luvula indlela yosetyenziso olungcono nolusebenzayo lweehydrocarbons ezinevumba elimnandi, ezizizixhobo ezibalulekileyo kuphando nakushishino.

I-oxidation ekhethiweyo ye-hydrocarbons ibalulekile kwiindlela ezininzi zeekhemikhali kunye neenkqubo zemizi-mveliso, kwaye ngenxa yoko, izazinzulu ziye zajonga iindlela ezisebenzayo zokwenza le oxidation.I-Copper oxide (CunOx) i-nanoparticles ifunyenwe iluncedo njenge-catalyst yokusetyenzwa kwee-hydrocarbons ezinevumba elimnandi, kodwa ukufuna iikhompawundi ezisebenzayo ngakumbi kuqhubekile.

Kwixesha elidlulileyo, izazinzulu zisebenzisa i-catalysts esekwe kwintsimbi ephucukileyo equka amasuntswana kwinqanaba le-nano.Kulo nqanaba, iinqununu zilinganisa ngaphantsi kwe-nanometer kwaye xa zibekwe kwii-substrates ezifanelekileyo, zinokunikela kwiindawo eziphezulu eziphezulu kune-nanoparticle catalysts ukukhuthaza ukusebenza kwakhona.

Kulo mkhwa, iqela lezenzululwazi ezibandakanya uProf. Kimihisa Yamamoto kunye noDkt Makoto Tanabe ovela eTokyo Institute of Technology (Tokyo Tech) baphanda ukuphendulwa kweekhemikhali ezenziwe yi-CunOx subnanoparticles (SNPs) ukuvavanya ukusebenza kwabo kwi-oxidation ye-hydrocarbons enuka kamnandi.I-CunOx SNPs zobukhulu obuthathu obukhethekileyo (kunye ne-12, i-28, kunye ne-athomu yobhedu engama-60) zaveliswa ngaphakathi kwesikhokelo esifana nemithi ebizwa ngokuba yi-dendrimers.Zixhaswa kwi-zirconia substrate, ziye zafakwa kwi-aerobic oxidation yekhompawundi ephilayo eneringi ye-benzene enuka kamnandi.

I-X-ray photoelectron spectroscopy (XPS) kunye ne-infrared spectroscopy (IR) zisetyenziselwe ukuhlalutya izakhiwo ze-SNP ezihlanganisiweyo, kwaye iziphumo zixhaswe yizibalo ze-Density functionality theory (DFT).

Uhlalutyo lwe-XPS kunye nezibalo ze-DFT zibonakalise ukunyuka kwe-ionicity yebhondi ye-copper-oxygen (Cu-O) njengoko ubungakanani be-SNP bunciphile.Le polarization yebhondi yayinkulu kunokuba ibonwe kwiibhondi ezininzi ze-Cu-O, kwaye i-polarization enkulu yayiyimbangela yokuphucula umsebenzi we-CunOx SNPs.

U-Tanabe kunye namalungu eqela baqaphele ukuba i-CunOx SNPs yanyusa i-oxidation yamaqela e-CH3 aqhotyoshelwe kwindandatho emnandi, ngaloo ndlela ekhokelela ekubunjweni kweemveliso.Xa i-CunOx SNP catalyst ingasetyenziswanga, akukho mveliso eyenziweyo.I-catalyst ene-CunOx SNPs encinci, i-Cu12Ox, yayineyona ndlela isebenzayo yokwenza i-catalytic kwaye ibonakalise ukuba yinto ehlala ixesha elide.

Njengoko uTanabe ecacisa, "ukuphuculwa kwe-ionicity yeebhondi ze-Cu-O kunye nokuncipha kobungakanani beeCunOx SNPs zenza umsebenzi wazo ongcono we-catalytic wokuvumba kwe-hydrocarbon oxidation."

Uphando lwabo luxhasa ingxabano yokuba kukho amandla amakhulu okusebenzisa i-copper oxide SNPs njenge-catalysts kwizicelo zoshishino."Ukusebenza kwe-catalytic kunye nomatshini wezi zinto zilawulwa ngokobungakanani beCunOx SNPs zinokuba ngcono kunezo zentsimbi eziphucukileyo, ezisetyenziswa kakhulu kwishishini ngoku," utshilo uYamamoto, ebonisa ukuba iCunOx SNP inokufezekiswa yintoni kwixesha elizayo.

Izixhobo ezibonelelwa yiTokyo Institute of Technology.Qaphela: Isiqulatho sinokuhlelwa ngokwesitayile nobude.

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