Kinetic studies on the CO oxidation on a Rh(111) surface by means of angle-resolved thermal desorption

概要

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The kinetics of the reaction of adsorbed CO with oxygen adatoms was studied in the temperature range of 100–600 K with LEED and angle-resolved thermal desorption. At small oxygen coverages the CO2 formation peaked from 500 to 400 K with increasing CO exposure. The activation energy decreased from 45 to 35 kcal/mol. When the oxygen coverage was large, a new CO2 formation peak appeared around 400 K. The activation energy was 30 kcal/mol. LEED observations revealed that the surface was covered by separate domains of CO and oxygen. The former CO2 is produced outside the domains or on the perimeters, whereas the latter is formed in the oxygen domains. The angular distribution of the desorption of CO2 in the former varied as cos4 θ, where θ is the desorption angle. The desorption of CO2 in the latter showed a sharper angular distribution of cos15θ .
American Institute of Physicsの論文
1984-12-01