Table 3
List of possible reactions taking place in the H2CO + H + O2 experiment.
| Reaction | Product(s) | Branching ratio | Activation energy | Rate constant | References |
|---|---|---|---|---|---|
| (%) | (kJ mol−1) | (s−1) | |||
| H + H2CO → | CH3O | – | 16–18 | 6 × 105 – 2 × 106 | a |
| CH2OH | – | 43–47 | 4 × 101 – 9 × 101 | a | |
| H2 + HCO | – | 21–25 | 4 × 105 – 1 × 106 | a | |
| H + HCO → | H2CO | 50 | 0 | – | zeroth-order approximation(♠) |
| H2 + CO | 50 | 0 | – | zeroth-order approximation | |
| H + CO → | HCO | – | 12.4(b) + 3(c) | 2 × 105 | b, c |
| H + O2 → | HO2 | 100 | ~0 | – | d |
| H + HO2 → | 2 OH | 50 | 0 | – | e, zeroth-order approximation |
| H2O2 | 50 | 0 | – | e, zeroth-order approximation | |
| 2 OH → | H2O2 | 90 | 0 | – | d |
| H2O + O | 10 | 0 | – | d | |
| H + H2O2 → | H2O + OH | – | 21–27 | 2 × 103 – 1 × 106 | f |
| H2 + HO2 | – | 39 | (◇) | g | |
| OH + HCO → | HCOOH | 50 | 0 | – | zeroth-order approximation |
| H2O + CO | 50 | 0 | – | zeroth-order approximation | |
| OH + H2CO → | H2O + HCO | – | 2.64 | (◇) | h |
| OH + CO → | H + CO2 | – | (*) | (*) | i, j, k |
| HOCO | ~100 | ~0 | – | i, j, k | |
| H + HOCO → | H2 + CO2 | 50 | 0 | – | zeroth-order approximation |
| HCOOH | 50 | 0 | – | zeroth-order approximation | |
| OH + H → | H2O | 100 | 0 | – | – |
| OH + H2 → | H2O + H | – | 22.4–24.3 | 2 × 105 – 5 × 105 | l |
| H + CH3O → | CH3OH | 50 | 0 | – | zeroth-order approximation |
| H2CO + H2 | 50 | 0 | – | zeroth-order approximation |
Notes. (-) indicatesvalues that are notthe defining parameters. (*) indicates multi-step reaction; values cannot be trivially obtained. (◇) indicates that unimolecular rate constants are not available. (♠) indicates first educated guess.
References.(a)Song & Kästner (2017). (b)Andersson et al. (2011). (c)Álvarez-Barcia et al. (2018); zero-point energy contribution. (d)Lamberts et al. (2013). (e)Lamberts et al. (2014). (f)Lamberts & Kästner (2017). (g)Lamberts et al. (2016). (h)Zanchet et al. (2018). (i)Nguyen et al. (2012). (j)Masunov et al. (2016). (k)Tachikawa & Kawabata (2016). (l)Meisner et al. (2017).
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