Oxidation of NH3 over YBa2Cu3O7(123) oxide systems

Ramesh, S. ; Hegde, M. S. (1992) Oxidation of NH3 over YBa2Cu3O7(123) oxide systems Journal of Catalysis, 135 (2). pp. 335-344. ISSN 0021-9517

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002195...

Related URL: http://dx.doi.org/10.1016/0021-9517(92)90037-I


A temperature-programmed desorption study showed that the activation energy of oxygen desorption from YBa2Cu3O7-x (x = 0.05), PrBa2Cu3O7-x (x =0.02), and YBa2Cu2CoO7-x (x = 0.26) were 28.2, 26.4, and 22.3 kcal/mole, respectively. Anaerobic oxidation of NH3 over these oxide systems shows the formation of H20, N2 and NO transforming the oxides to tetragonal phases. Aerobic oxidation of NH3 is NO specific over all the three oxide catalysts. The Co-substituted YBa2Cu2 CoO7+x was the most reactive and stable oxide in this family; the lower oxygen desorption energy and higher reactivity are suggested to be due to the presence of holes in the form Co4+O2- Co3+O-. The conversion of NH3 to NO was nearly 100% above 400°C when the ammonia flow rates were 10 μmole/cm2/s over 0.3 g of the YBa2Cu2CoO7+x catalyst. Structural Chemistry Unit.

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