期刊
CATALYSIS LETTERS
卷 134, 期 3-4, 页码 210-216出版社
SPRINGER
DOI: 10.1007/s10562-009-0244-0
关键词
Manganese oxides; Microrods; Nanocrystals; CO oxidation; Oxalate precipitation
资金
- ARC (Communaute Francaise de Belgique)
- Hungarian Science and Research Fund OTKA [NNF 78837]
Manganese oxides of various stoichiometry were prepared via Mn-oxalate precipitation followed by thermal decomposition in the presence of oxygen. A non-stoichiometric manganese oxide, MnOx (x = 1.61...1.67) was obtained by annealing at 633 K and demonstrated superior CO oxidation activity, i.e. full CO conversion at room temperature and below. The activity gradually decreased with time-on-stream of the reactants but could be easily recovered by heating at 633 K in the presence of oxygen. CO oxidation over MnOx in the absence of oxygen proved to be possible with reduced rates and demonstrated a Mars-van Krevelen-type mechanism to be in operation. A TEM structural analysis showed the MnOx phase to form microrods with large aspect ratio which broke up into nanocrystalline manganese oxide (MnOx) particles with diameters below 3 nm and a BET specific surface area of 525 m(2)/g. Annealing at 798 K rather than 633 K produced well crystalline Mn2O3 which showed lower CO oxidation activity, i.e. 100% CO conversion at 335 K. The catalytic performance in CO oxidation of various Mn-oxides either studied in this work or elsewhere was compared on the basis of specific reaction rates.
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