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Kinetic study of methanol oxidation on Pt2Ru3/C catalyst in the alkaline media

Kinetika oksidacije metanola na Pt2Ru3/C katalizatoru u alkalnoj sredini

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2007
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Authors
Tripković, Amalija
Popović, Ksenija
Lović, Jelena
Article (Published version)
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Abstract
The electrochemical oxidation of methanol in NaOH solution was examined on a thin film Pt2Ru3/C electrode. The XRD pattern revealed that the Pt2Ru3 alloy consisted of a solid solution of Ru in Pt and a small amount of Ru or a solid solution of Pt in Ru. It was shown that in alkaline solution, the difference in activity between Pt/C and Pt2Ru3/C is significantly smaller than in acid solution. It is proposed that the reaction follows a quasi bifunctional mechanism. The kinetic parameters indicated that the chemical reaction between adsorbed COad and OHad species could be the rate limiting step.
Elektrohemijska oksidacija metanola ispitivana je na nanokatalizatoru Pt2Ru3 dispergovanom na aktivnom uglju kao nosaču u alkalnoj sredini. Katalizator je karakterisan difrakcijom X-zraka (XRD) i dobijeni rezultati su pokazali da se legura Pt2Ru3 sastoji od dve faze: čvrstog rastvora Ru u Pt i od malih količina čistog Ru ili čvrstog rastvora Pt u Ru. Poređenjem aktivnosti Pt/C i Pt2Ru3/C katalizatora u oksidaciji metanola u alkalnoj sredini, pokazano je da je ta razlika znatno manja nego u kiseloj sredini. Predložen je kvazi-bifunkcionalni mehanizam reakcije. Dobijeni kinetički parametri ukazuju na to da je hemijska reakcija između adsorbovanih COad i OHad čestica spori stupanj u oksidaciji metanola na Pt2Ru3/C katalizatoru u alkalnoj sredini.
Keywords:
platinum-ruthenium alloy / supported nanocatalyst / XRD analysis / methanoloxidation / alkaline solution
Source:
Journal of the Serbian Chemical Society, 2007, 72, 11, 1095-1101
Publisher:
  • Serbian Chemical Society
Projects:
  • Novi materijali za primenu u gorivim spregovima sa polimernom membranom (RS-142056)

DOI: 10.2298/JSC0711095T

ISSN: 0352-5139

Scopus: 2-s2.0-36048929809
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/290
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