Ososayensi e-Tokyo Institute of Technology babonise ukuthi izinhlayiya ze-copper oxide ku-sub-nanoscale zingama-catalysts anamandla kune-nanoscale.Lawa ma-subnanoparticles angakwazi futhi ukuvuselela ukusabela kwe-oxidation yama-hydrocarbon anephunga elimnandi kakhulu kunama-catalyst asetshenziswa embonini.Lolu cwaningo luvula indlela yokusetshenziswa okungcono nangempumelelo kwama-hydrocarbon anephunga elimnandi, okuyizinto ezibalulekile kukho kokubili ucwaningo nezimboni.

I-oxidation ekhethiwe yama-hydrocarbon ibalulekile ekuphenduleni kwamakhemikhali amaningi kanye nezinqubo zezimboni, futhi ngenxa yalokho, ososayensi bebelokhu befuna izindlela ezisebenza kahle kakhulu zokwenza lokhu ku-oxidation.Ama-nanoparticles e-Copper oxide (CunOx) atholakale ewusizo njengesisusa sokucubungula ama-hydrocarbon anephunga elimnandi, kodwa ukufuna kwezinhlanganisela ezisebenza kahle nakakhulu kuqhubekile.

Esikhathini esidlule, ososayensi basebenzise ama-catalyst asekelwe ensimbi ahlanganisa izinhlayiya ezingeni le-sub-nano.Kuleli zinga, izinhlayiya zikala ngaphansi kwe-nanometer futhi uma zibekwe kuma-substrates afanelekile, zinganikeza ngisho nezindawo eziphakeme kakhulu kune-nanoparticle catalysts ukukhuthaza ukusebenza kabusha.

Kulo mkhuba, ithimba lososayensi elihlanganisa uProf. Kimihisa Yamamoto kanye noDkt. Makoto Tanabe abavela e-Tokyo Institute of Technology (Tokyo Tech) baphenya ukusabela kwamakhemikhali okwenziwe yi-CunOx subnanoparticles (SNPs) ukuze bahlole ukusebenza kwabo ku-oxidation yama-hydrocarbons anephunga elimnandi.Ama-CunOx SNP osayizi abathathu abathize (ana-12, 28, kanye nama-athomu ethusi angama-60) akhiqizwa ngaphakathi kwezinhlaka ezifana nesihlahla ezibizwa ngokuthi ama-dendrimers.Zisekelwe ku-zirconia substrate, zifakwe ku-aerobic oxidation yento ephilayo eneringi ye-benzene enephunga elimnandi.

I-X-ray photoelectron spectroscopy (XPS) kanye ne-infrared spectroscopy (IR) zisetshenziswe ukuze kuhlaziywe izakhiwo ezihlanganisiwe ze-SNP, futhi imiphumela yasekelwa izibalo ze-density functionality theory (DFT).

Ukuhlaziywa kwe-XPS nokubalwa kwe-DFT kwembule ionicity ekhulayo yamabhondi e-copper-oxygen (Cu-O) njengoba usayizi we-SNP wehla.Lokhu kuhlukaniswa kwebhondi bekukukhulu kunalokho okubonwa kunqwaba yamabhondi e-Cu-O, futhi ukuhlukaniswa okukhulu kwaba yimbangela yomsebenzi othuthukisiwe we-CunOx SNPs.

U-Tanabe kanye namalungu eqembu babone ukuthi ama-CunOx SNP asheshisa ukukhishwa kwe-oxidation kwamaqembu e-CH3 axhunywe kwendandatho enamakha, ngaleyo ndlela kuholele ekwakhiweni kwemikhiqizo.Lapho i-CunOx SNP catalyst ingasetshenziswanga, ayikho imikhiqizo eyakhiwe.I-catalyst ene-CunOx SNPs encane kakhulu, i-Cu12Ox, ibe nokusebenza okuhle kakhulu kwe-catalytic futhi ibonakale ithatha isikhathi eside kakhulu.

Njengoba uTanabe echaza, "ukuthuthukiswa kwe-ionicity yamabhondi e-Cu-O ngokuncipha kosayizi wama-CunOx SNPs kwenza umsebenzi wawo ongcono we-catalytic for aromatics hydrocarbon oxidations."

Ucwaningo lwabo lusekela ingxabano yokuthi kukhona amandla amakhulu okusebenzisa i-copper oxide SNPs njengezisusa ekusetshenzisweni kwezimboni."Ukusebenza kwe-catalytic kanye nendlela yalawa ma-CunOx SNP ahlanganisiwe alawulwa usayizi kungaba ngcono kunalawo ama-catalysts ensimbi ahloniphekile, asetshenziswa kakhulu embonini njengamanje," kusho u-Yamamoto, eqondisa lokho okungafinyelelwa yi-CunOx SNPs esikhathini esizayo.

Izinto ezihlinzekwa yi-Tokyo Institute of Technology.Qaphela: Okuqukethwe kungase kuhlelwe ngesitayela nobude.

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