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The pseudo-catalytic promotion of nitric oxide oxidation by ethane at low temperatures

机译：乙烷在低温下伪催化促进一氧化氮氧化

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Experimental work carried out in a flow reactor has shown that, from 700 to 750 K, low concentrations of ethane can act as a virtual catalyst in effecting the oxidation of NO to NO_2. That is, while there is strong promotion of the oxidation of NO, there is very little concurrent degradation of the ethane. This contrasts with other experimental and modeling investigations, in which promotion by the hydrocarbon of NO oxidation has accompanied oxidation of a considerable fraction of the hydrocarbon. The rate of this pseudo-catalytic effect is significantly affected by the concentrations of both ethane and oxygen, which in this study ranged from 0 to 70% for [O_2], 0 to 5000 ppm for [C_2H_6], and 0 to 350 ppm for [NO]. The level of reaction achieved under the various conditions was measured in terms of the rates of formation of NO_2 and C_2H_4 Current kinetic mechanisms, though displaying good accuracy in other temperature regimes, fail to predict this pseudo-catalytic behavior of ethane, indicating that several elementary reactions important at the low temperatures are missing or poorly represented in such mechanisms. Mechanistic modifications are discussed and allow the measurements to be simulated more closely than with existing reaction schemes. It has been shown that the relative rates of the competing reactions C_2H_5 + O_2 → C_2H_4 + HO_2 and C_2H_5 + O_2 (+M) → C_2H_5O_2 + (M) are of critical importance in this situation.
机译：在流动反应器中进行的实验工作表明，从700 K到750 K，低浓度的乙烷可以充当虚拟催化剂，将NO氧化为NO_2。即，虽然强烈促进了NO的氧化，但是乙烷的同时降解却很小。这与其他实验和模型研究形成对比，在其他实验和模型研究中，碳氢化合物对NO氧化的促进作用伴随着相当一部分碳氢化合物的氧化。这种拟催化作用的速率受乙烷和氧气浓度的显着影响，在本研究中，[O_2]的浓度为0至70％，[C_2H_6]的浓度为0至5000 ppm，而[C_2H_6]的浓度为0至350 ppm。 [没有]。根据NO_2和C_2H_4的形成速率测量了在各种条件下所达到的反应水平。尽管在其他温度条件下显示出良好的准确性，但当前的动力学机理未能预测乙烷的这种假催化行为，表明几种元素在这种机制中，低温下重要的反应缺失或表现不佳。讨论了机械修改，并允许与现有反应方案相比更精确地模拟测量结果。已经证明竞争反应C_2H_5 + O_2→C_2H_4 + HO_2和C_2H_5 + O_2（+ M）→C_2H_5O_2 +（M）的相对速率至关重要。

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