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1 Bulletin of the Polish Academy of Sciences. Chemistry

1 2002

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Catalytic cycle of NOx conversion based on pentacyanoferrate complexes

Maciejowska I., Stasicka Z.

Bulletin of the Polish Academy of Sciences. Chemistry

2002

Vol. 50, No. 1

67-76

Conversion of NO(x) + NH(3) to N(2), catalysed by the [Fe(II)(CN)(5)L]n- complexes (L= NO(+), NH(3), H(2)O proceeds through addition, comproportionation and substitution processes within the complexes and the reaction rates are sensitive to the different parameters. In this study the role of added cations was investigated and the main impact found concerned acceleration of the [Fe(CN)(5)NO](2)(2-) production from [Fe(CN)(5)L](3) (L= H(2)O, NH(3) and NO(2)(-) in alkaline medium. This could be achieved by increasing the amount ratio of [Fe(CN)(5)H(2)O] to its parent ammonia complex at given pH taking advantage from the specific cation effect on the rate of the [Fe(CN)(5)NH(3)](3) aquation. The rate wasaffected not only by concentration but also by the nature of the cation, i.e. by the hydratedradius of cation and its influence on the solution viscosity. The reaction of [Fe(CN)(5)NO](2-) with ammonia was re-examined in aspects of the pH dependent production of molecular nitrogen. The results are summarised in the overall photocatalytic cycle for which the optimal working pH range is limited to 10-11. The trend is consistent with the nucleophilic attack of NH(3)(+) on the N(NO) atom in [Fe(CN)(5)NO](2), followed by comproportionation within the N(NO)NH(+)(3) ligand, which results in N(2) generation.