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Low-temperature hydrocarbon combustion over proton conductor/metal–mixed catalysts
Ist Teil von
Journal of catalysis, 2010-07, Vol.273 (1), p.59-65
Ort / Verlag
Amsterdam: Elsevier Inc
Erscheinungsjahr
2010
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
A micro-scale electrochemical reactor using a Sn
0.9In
0.2P
2O
7
+
Pt catalyst provided two to four orders of magnitude higher catalytic activity for propane oxidation under stoichiometric conditions, compared to that of a reactor using a Pt/γ-Al
2O
3.
Catalytic combustion of hydrocarbons is a highly active field of research, particularly in relation to the reduction of pollutant emissions from automobiles. In this study, we report on hydrocarbon oxidation at the internal interfaces of a mixed catalyst consisting of Sn
0.9In
0.1P
2O
7 and Pt powders. In a gaseous mixture of propane, H
2O, and O
2, the H
2O dissociates into protons, electrons and active oxygen species at anodic interface sites, leading to oxidation of the hydrocarbon to CO
2. On the other hand, O
2 reacts with protons and electrons to form H
2O at cathodic interface sites. As a consequence, local electrochemical cells are formed at the interfaces, and undergo self-discharge. It was shown that the mixed catalyst had a high turnover frequency for Pt, yielding high catalytic activity for Pt contents of as low as 0.1
wt% and an initiation temperature for hydrocarbon oxidation of 150
°C.