Effects of O(sub 2) on the reduction of NO over prereduced CaO surfaces: a mechanistic understanding

Article Abstract:

The effects of O(sub 2) on the reduction of nitric oxide over prereduced CaO surfaces have been investigated by exposing the surfaces to O(sub 2) at various temperatures. It was found that at least three different reaction channels exist, of which two are linked to the high-temperature reduction of the CaO surfaces and involve the use of additional electrons in breaking the nitric oxide bond. The third reaction channel does not utilize extra electrons for breaking the bond. However, the activity is affected by the amount of surface oxygens that are adsorbed. These results are compared with the reduction of nitric oxide over completely oxidized surfaces.

Oxygen, Calcium, Calcium (Chemical element), Nitrogen oxides, Surface chemistry, Nitrogen oxide

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Promoting effects of Na and Fe impurities on the catalytic activity of CaO in the reduction of NO by CO and H2

Article Abstract:

Research was conducted to examine the heterogeneous reduction of NO by H2 and CO over different CaO materials. For both reducing species, the dependence of the specific NO reduction rate on the impurity content was demonstrated. Results indicate that the presence of impurities in the CaO crystal structure did not have any substantial influence on the apparent activation energy. Findings also emphasized the importance of O- sites, created by the Na+ impurities.

Sodium, Sodium (Chemical element), Oxidation-reduction reaction, Oxidation-reduction reactions, Iron, Iron (Metal), Catalysis

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Kinetic study of heterogeneous oxygen-exchange reactions and bulk self-diffusion of oxygen

Article Abstract:

Research was conducted to examine the effects of surface pretreatment on the apparent activation energy for single-oxygen-isotope exchange between Cao and O2. Apparent activation energies were established for the reactions between O2, CO or NO and preoxidized or prereduced CaO surfaces. Results demonstrate that eventually the self-diffusion of oxygen ions in the bulk becomes the rate-determining step in the isotope-exchange reaction.

Diffusion, Diffusion (Physics), Active oxygen

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