Reaction between chlorine dioxide and nitric oxide

Abstract

The reaction between chlorine dioxide and nitric oxide has been studied in a fast-flow system at total pressures near 1 mm Hg and at 294°K. Under conditions when atomic chlorine is removed heterogeneously, the mechanism of the reaction is described by [graphic omitted] with k₂/k₁=(0.30 ± 0.05), and k₁ 5 × 10¹¹ cm³ mole^–1 sec^–1. For systems in which k_w is small, chlorine atoms produced in reaction (2) remove further chlorine dioxide according to the fast reaction, Cl + OClO → ClO + ClO (3) The rate constant k₁ is large for a molecular reaction of low exothermicity.