Rate constants for the reactions OH+H2S→H2O+SH and OH+NH3 →H2O+NH2 over the temperature range 297–427 °K

Abstract

Rate constants for the reactions OH+H₂S→H₂O+SH (k₁) and OH+NH₃→H₂O+NH₂ (k₂) were determined over the temperature range 297–427 °K by a flash photolysis–resonance fluorescence technique. The Arrhenius expressions obtained were k₁= (5.2±0.5) ×10⁻¹² cm³ molecule⁻¹sec⁻¹, independent of temperature (297–424 °K); k₂=2.93×10⁻¹² e^{−(1710±300)/RT} cm³ molecule⁻¹sec⁻¹ with rate constants at 298 °K of k₁= (5.25±0.53) ×10⁻¹² cm³ molecule⁻¹sec⁻¹ and k₂= (1.64±0.16) ×10⁻¹³ cm³ molecule⁻¹sec⁻¹. These rate constants are compared and discussed with literature values.