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Oxidation mechanism of carbon black by NO_2: Effect of water vapour

机译：NO_2氧化炭黑的机理：水蒸气的影响

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摘要

The oxidation mechanism of carbon by automotive exhaust gasses (O_2, H_2O and NO_2) was investigated in the range of temperature (300-400℃) corresponding to the operation conditions of the continuous regeneration regime of the soot trap. No carbon gasification occurs when O_2 is injected in absence of NO_2 below 450℃. However, when O_2 (10 vol.%) and NO_2 (100-600 ppmv) are both present in the gas mixture, two distinct carbon oxidation reactions take place. A direct reaction occurs between NO_2 and the carbon surface along with a co-operative one involving simultaneously O_2 and NO_2. In the latter case, NO_2 promotes the decomposition of the intermediate C(O) complex. Injection of water vapour increases the overall oxidation rate but does not modify the global mechanism. The promoting effect of water is attributed to the intermediate formation of traces of nitric and nitrous acids which enhance the direct reaction C-NO_2 rate. In contrast, water has no measurable effect on the co-operative C-NO_2-O_2 reaction. A relationship between the water promoting effect on the direct oxidation rate and the amount of theoretical formation of HNO_2 and HNO_3 was established.
机译：在与烟灰捕集器连续再生方式的运行条件相对应的温度范围（300-400℃）内，研究了汽车废气（O_2，H_2O和NO_2）对碳的氧化机理。在不存在低于450℃的NO_2的情况下注入O_2不会发生碳气化。但是，当气体混合物中同时存在O_2（10体积％）和NO_2（100-600 ppmv）时，会发生两个不同的碳氧化反应。 NO_2与碳表面之间发生直接反应，同时发生的反应包括O_2和NO_2。在后一种情况下，NO_2促进中间C（O）配合物的分解。注入水蒸气可提高总体氧化速率，但不会改变整体机理。水的促进作用归因于痕量硝酸和亚硝酸的中间形成，这提高了直接反应的C-NO_2速率。相反，水对合作的C-NO_2-O_2反应没有可测量的影响。建立了水对直接氧化速率的促进作用与HNO_2和HNO_3的理论形成量之间的关系。

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