Masayendisiti kuTokyo Institute of Technology vakaratidza kuti copper oxide zvimedu pane sub-nanoscale zvine simba zvinokonzeresa kupfuura izvo zviri pa nanoscale.Aya ma subnanoparticles anogona zvakare kukonzeresa maitiro eiyo oxidation yeanonhuhwirira hydrocarbons zvinobudirira zvakanyanya kupfuura zvinokonzeresa zviri kushandiswa muindasitiri.Chidzidzo ichi chinovhura nzira yekushandiswa kuri nani uye kwakanyatsoshanda kwemahydrocarbons anonhuhwirira, zvinova zvinhu zvakakosha zvetsvagiridzo neindasitiri.

Iyo yakasarudzika oxidation yemahydrocarboni yakakosha mukuita kwemakemikari akawanda uye maindasitiri maitiro, uye nekudaro, masayendisiti anga achitsvaga nzira dzakasimba dzekuita oxidation iyi.Copper oxide (CunOx) nanoparticles yakawanikwa ichibatsira sechinhu chinokonzeresa kugadzira anonhuwirira mahydrocarbons, asi kuda kweanotonyanya kushanda makomisheni kwaenderera mberi.

Munguva pfupi yapfuura, masayendisiti akashandisa zvakanaka simbi-based catalysts inosanganisira zvimedu pane sub-nano level.Pane iyi nhanho, zvimedu zvinoyera zvishoma pane nanometer uye kana zvakaiswa paakakodzera substrates, anogona kupa kunyange yakakwirira pamusoro nzvimbo kupfuura nanoparticle catalysts kukurudzira reactivity.

Muchiitiko ichi, chikwata chemasayendisiti chinosanganisira Prof. Kimihisa Yamamoto naDr. Makoto Tanabe vanobva kuTokyo Institute of Technology (Tokyo Tech) vakatsvaga maitiro emakemikari akagadziriswa neCunOx subnanoparticles (SNPs) kuti vaongorore kushanda kwavo muoxidation yemahydrocarboni anonhuwira.CunOx SNPs dzematatu chaiwo saizi (ane gumi nemaviri, makumi maviri nemasere, uye makumi matanhatu emaatomu emhangura) akagadzirwa mukati memiti-yakafanana nemapuranga anonzi dendrimers.Vachitsigirwa pazirconia substrate, vakaiswa kune aerobic oxidation yeorganic compound ine inonhuwirira benzene mhete.

X-ray photoelectron spectroscopy (XPS) uye infrared spectroscopy (IR) yakashandiswa kuongorora maSNPs akagadzirwa, uye mhedzisiro yakatsigirwa ne density functionality theory (DFT) kuverenga.

Kuongorora kweXPS uye kuverenga kweDFT kwakaratidza kuwedzera ionicity yemhangura-okisijeni (Cu-O) zvisungo sezvo saizi yeSNP yakadzikira.Ichi chisungo polarization chaive chakakura kupfuura icho chinoonekwa muhuwandu hweCu-O mabhondi, uye iyo polarization yakakura ndiyo yakakonzera iyo yakagadziridzwa catalytic chiitiko cheCunOx SNPs.

Tanabe nenhengo dzechikwata vakaona kuti CunOx SNPs yakamhanyisa oxidation yemapoka eCH3 akasungirirwa mhete inonhuhwirira, zvichizotungamira mukuumbwa kwezvigadzirwa.Apo CunOx SNP catalyst haina kushandiswa, hapana zvigadzirwa zvakaumbwa.Iyo inokonzeresa ine diki CunOx SNPs, Cu12Ox, yaive neyakagwinya mashandiro ekuita uye yakaratidza kuve yakarebesa.

Sokutsanangura kunoita Tanabe, "kukwidziridzwa kweiyo ionicity yeCu-O zvisungo nekudzikira kwesaizi yeCunOx SNPs inogonesa chiitiko chavo chiri nani chekugadzirisa kunhuhwirira kwehydrocarbon oxidation."

Tsvagiridzo yavo inotsigira gakava rekuti kune mukana mukuru wekushandisa copper oxide SNPs sezvinokonzeresa mumaindasitiri ekushandisa."Kuita kwekuita uye mashandiro eiyi saizi-inodzorwa akagadzirwa CunOx SNPs angave ari nani pane aya emhando yepamusoro simbi catalysts, ayo anonyanya kushandiswa muindasitiri parizvino," Yamamoto akadaro, achinongedza izvo CunOx SNPs inogona kuwana mune ramangwana.

Zvishandiso zvinopihwa neTokyo Institute of Technology.Cherechedzo: Zviri mukati zvinogona kugadziridzwa sechimiro uye kureba.

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