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 440 K is ...
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https://www.riss.kr/link?id=A3328545
Rhee, Choong Kyun (Department of Chemistry, Chungnam National Univ.) ; Lee, Ho In (Dept. of Chem. Tech., College of Eng., Seoul National Univ.)
1994
English
570.000
SCIE,SCOPUS,KCI등재
학술저널
48-54(7쪽)
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다운로드다국어 초록 (Multilingual 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 440 K is ...
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 440 K is attributed to carbonyl species adsorbed on Co^(3+) 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 Co^(3+) ions. The other apparently incorporates with bulk LaCoO₃ and desorbs above 1000 K. 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.
THE EFFECT OF ASYMMETRIES OF DIE EXIT GEOMETRY ON EXTRUDATE SWELL AND MELT FRACTURE
CHARACTERIZATION OF TURBULENT DRAG REDUCTION IN ROTATING DISK SYSTEM
EFFECT OF CATALYST PORE STRUCTURE ON EFFECTIVE DIFFUSIVITY
REMOVAL OF SOχ AND NOχ FROM FLUE GAS WITH CERIA