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- W2333815624 abstract "Abstract The oxidation of carbon monoxide was studied at atmospheric pressure in a plug-flow reactor over polycrystalline ruthenium dioxide powder in the temperature range from 363 to 453 K as a function of the pretreatment. Calcining RuO 2 in flowing oxygen resulted in purified bulk RuO 2 , whereas reduction in hydrogen led to bulk Ru metal, which was partially oxidized again in flowing oxygen at increasing temperatures ( T ox ) up to 573 K to obtain RuO 2 /Ru shell-core particles with increasing RuO 2 shell thickness. Using the TPR technique subsequent to steady-state CO oxidation to monitor the degree of oxidation, the most active and stable state of the unsupported ruthenium catalysts was identified as an ultra-thin RuO 2 layer covering a metallic Ru core in agreement with the shell-core model established for supported Ru catalysts. Steady-state turnover frequencies (TOFs) obtained with the ultra-thin RuO 2 films are in good agreement with TOFs reported for studies on Ru single crystal surfaces and with supported Ru catalysts. Only for RuO 2 films thicker than 1 nm ( T ox ≥ 473 K) and for fully oxidized RuO 2 deactivation was observed, presumably due to the formation of inactive RuO 2 surfaces such as the RuO 2 (100)-c(2×2) facet. Moreover, it was demonstrated that the presence of moisture in the reactant feed inhibits the oxidation of CO completely." @default.
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- W2333815624 date "2005-07-01" @default.
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- W2333815624 title "Structure-Activity Correlations for the Oxidation of CO over Polycrystalline RuO<sub>2</sub> Powder Derived from Steady-State and Transient Kinetic Experiments" @default.
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- W2333815624 doi "https://doi.org/10.1524/zpch.219.7.979.67092" @default.
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