Abstract
The combined effect of potential and temperature on the mechanism of autocatalytic reduction of nitric acid is analyzed. The change of solubility of nitrogen oxides with temperature allows separation of potential intervals with predominant contribution of homogenous autocatalysis. Heterogeneous autocatalysis dominates in concentrated media, while homogenous catalysis is more real in totally disassociated solutions. The presence of nickel in steels catalyzes the formation of ammonia ions.
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