This work assesses the carbon monoxide formation upon Fenton process, the most popular method for Advanced Oxidation Processes (AOPs). CO concentrations in the order of 11,000 mg/Nm³ were measured in the Fenton oxidation of phenol after 180 min reaction at 90 °C and 3 bar. The Fenton oxidation performed on phenol and its oxidized intermediates such as hydroquinone, catechol and short-chain acids allows concluding that CO is produced through the oxidative cleavage of aromatic rings; the hydroquinone route being more selective to CO than catechol. In all cases, the carbon mass balance was satisfactorily closed to 100%. The study of the influence of the operational conditions shows that CO production is clearly favoured at H₂O₂ dosage above the stoichiometric value and low temperatures (T < 90°). The H₂O₂ dosage was the most influence variable.

The results of this work evidence for the first time the production of noxious amounts of CO along with CO₂ in Fenton processes. This finding highlights the importance of evaluating not only liquid phase intermediates due to their recalcitrant and/or toxic behavior, but also gas phase because of CO emissions.

这项工作评估了Fenton工艺（最先进的高级氧化工艺（AOP））中一氧化碳的形成。在90°C和3 bar下反应180分钟后，苯酚的Fenton氧化反应测得的CO浓度为11,000 mg / Nm ³。对苯酚及其氧化的中间体（如对苯二酚，邻苯二酚和短链酸）进行的Fenton氧化可以得出结论，CO是通过芳环的氧化裂解而产生的；对苯二酚路线比邻苯二酚对CO更具选择性。在所有情况下，碳质量平衡均令人满意地接近100％。对运行条件影响的研究表明，H ₂ O ₂明显有利于CO的生产高于化学计量值和低温（T <90°）的剂量。H ₂ O ₂剂量是影响最大的变量。

这项工作的结果首次证明了Fenton工艺中与CO ₂一起产生有害量的CO 。这一发现突出了评估不仅要评估因其难降解和/或有毒行为而引起的液相中间体的重要性，而且还应因对CO的排放来评估气相的重要性。