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Zaštita materijala
2018, vol. 59, br. 2, str. 265-272
Pt/Ru0,7Ti0,3O2 kao nanokatalizator za oksidaciju vodonika i njegova tolerancija na CO
Obradović Maja D.a ORCID, Gojković Snežana Lj.b ORCID
aUniverzitet u Beogradu, Institut za hemiju, tehnologiju i metalurgiju - IHTM, Srbija
bUniverzitet u Beogradu, Tehnološko-metalurški fakultet, Srbija

e-adresa: obradovic@ihtm.bg.ac.rs
Projekat:
Razvoj, karakterizacija i primena nanostruktuiranih kompozitnih katalizatora i interaktivnih nosača u gorivnim spregovima i elektrolizi vode (MPNTR - 172054)

Ključne reči: platina; RuO2; TiO2; oksidacija vodonika; tolerancija na CO
Sažetak
Oksidacija čistog H2 i smeše H2/CO (100 ppm CO) je ispitivana na nanokatalizatoru koji se sastojao od čestica Pt na nosaču Ru0,7Ti0,3O2 (Pt/Ru0,7Ti0,3O2). Korišćene su metoda linearne voltametrije u rastvoru 0,1 M HClO4 i rotirajuća disk elektroda. Rezultati su upoređeni sa komercijalnim katalizatorom Pt/C. Za katalizator Pt/Ru0,7Ti0,3O2 je utvrđena dobra provodnost i stabilnost nosača u elektrohemijskim eksperimentima. Pokazano je da oksidacija adorbovanog CO na Pt/Ru0,7Ti0,3O2 počinje na negativnijim potencijalima nego na Pt/C. To ukazuje da su nanočestice Pt u bliskom kontaktu sa atomima Ru iz nosača, što omogućuje odigravanje bifunkcionalnog mehanizma i ispoljavanje elektronskog efekta. Uticaj trovanja katalizatora Pt/Ru0,7Ti0,3O2 i Pt/C adsorbovanim CO na oksidaciju H2 je ispitivan na nekoliko stepena pokrivenosti u opsegu od 0 do 0,6. Smanjenje struje oksidacije vodonika na površini delimično pokrivenoj adsorbovanim CO u oblasti malih prenapetosti 0,05-0,50 V je manje izraženo na Pt/Ru0,7Ti0,3O2 u odnosu na Pt/C. Ovo se pripisuje slabljenju interakcija Pt-CO što dovodi do povećane pokretljivosti CO na česticama Pt koje su u kontaktu sa Ru iz nosača Ru0,7Ti0,3O2.
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O članku

jezik rada: engleski
vrsta rada: naučni članak
DOI: 10.5937/ZasMat1802265O
objavljen u SCIndeksu: 13.07.2018.
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