Oxidation of formaldehyde in KCl-coated vessels

摘要: In the temperature range 440–540°C, oxidation of HCHO in KCl-coated vessels is reproducible and short chain length for concentrations 0.05–4 Torr. Interpretation [CO] against time profile permits evaluation unknown parameters k1, k7/k1/24 k8. + O2→ HO2+ HCO (1), HO2→ H2O2+ O2(4), HO2 [graphic ommitted] ½ H2O O2(7), H2O2 +½ O2. (8). Comparison experimental values k8 with those calculated from diffusion theory indicates that destruction at surface fully controlled, whereas H2O2, though moderately efficient, not controlled. From measurements below 0.5 Torr, where close to unity, effectively direct k1 have been obtained, being 7.65 × 10–1, 2.08 8.50 10–2 2.20 dm3 mol–1 s–1 542.5, 500, 471 440.5°C, respectively. These give Arrhenius A1= 2.04 1010 s–1, E1= 38.9 ± 1.5 kcal mol–1. The absence any diameter effect on value confirms refer homogeneous process.