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Catalytic activity of Pt catalysts promoted by MnOx for n-hexane oxidation

Authorized Users Only
2011
Authors
Anic, Mirjana
Radić, Nenad
Grbić, Boško
Dondur, Vera
Damjanović, Ljiljana
Stoychev, Dimitar
Stefanov, Plamen
Article (Published version)
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Abstract
The deep oxidation of n-hexane was studied over Pt catalysts with small and large Pt crystallites, promoted by MnOx. The Mn was deposited on the Pt/Al2O3 by deposition-precipitation method using two alkalis, ammonia and dimethylamine. The strength of the base influenced morphology and performances of Mn-Pt catalysts. Ammonia formed mostly spherical structure of manganese oxide, while dimethylamine created fibrous needle-like shape of MnOx, typical for cryptomelane phase of manganese oxide. This was confirmed by XPS results that show an oxidation state of Mn close to that for cryptomelane. The Pt-Mn catalysts were more active than catalysts containing Pt only. Promoting effect of MnOx is more pronounced for larger Pt crystallites. Among Pt-Mn samples, catalysts synthesized with dimethylamine exhibited the highest activities. Mobility and reactivity of oxygen from Pt-O-Mn sites associated with cryptomelane phase may be responsible for increased activity.
Keywords:
Pt/Al2O3 catalyst / Manganese oxide / Deep oxidation / n-Hexane / Promoting effect
Source:
Applied Catalysis B-Environmental, 2011, 107, 3-4, 327-332
Publisher:
  • Elsevier Science Bv, Amsterdam
Projects:
  • The development of efficient chemical-engineering processes based on the transport phenomena research and process intensification principles (RS-172022)
  • Chemical and structural designing of nanomaterials for application in medicine and tissue engineering (RS-172026)

DOI: 10.1016/j.apcatb.2011.07.032

ISSN: 0926-3373

WoS: 000295305500012

Scopus: 2-s2.0-80052622464
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/865
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