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CO OXIDATION ON LaCoO3 PEROVSKITE
Korean Journal of Chemical Engineering, January 1994, 11(1), 48-54(7), 10.1007/BF02697514
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Abstract
A study of CO oxidation on LaCoO3 perovskite was performed in an ultrahigh vacuum system by means of adsorption and desorption. All gases were adsorbed at ambient temperature. Two adsorption states(α-and β-)of CO exist. The α-peak at 440K is attributed to carbonyl species adsorbed on Co3+ ions while the β-peak at 663 K likely comes from bidentate carbonate formed by adsorption on lattice oxygens. CO2 shows a single desorption peak(β-state, 483 K) whose chemical state may be monodentate carbonate. A new CO2 desorption peak at 590 K can be created by oxidation of CO. O2 also shows two adsorption states. One desorbs at 600 K, which may reflect adsorption on Co3+ ions. The other apparently incorporates with bulk LaCoO3 and desorbs above 1000K. The two adsorption states of CO are oxidized via different mechanisms. The rate determining step in oxidation of α-CO is the surface reaction whereas for that of β-CO, it is desorption of product CO2.
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