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Adsorption and reduction of NO over activated coke at low temperature

机译：低温下焦炭对NO的吸附和还原

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NO adsorption and reduction with NH_3 over activated coke at low temperatures were studied by temperature-programmed desoption (TPD) and step-response experiments. NO adsorption is inhibited by competitive adsorption of NH_3 in the absence of oxygen, and is significantly increased in the presence of oxygen. This phenomenon cannot be explained by either the oxidation of NO in the gas phase, nor the creation of oxidized surface on the activated coke. A hypothesis is proposed to interpret the phenomenon, which suggests that on the surface of the activated coke there are at least two types of adsorption sites, one of them adsorbs NO_2 and/or the oxidized NO species rather than NO. NO--NH_3--O_2 reaction proceeds via both the ED mechanism and the LH mechanism. NO conversion decreases with increasing temperature in the range of 30--250deg.C, which suggests that the adsorption of reactants, especially NH_3, is the rate-limiting step.
机译：通过程序升温除臭（TPD）和阶跃响应实验研究了低温下活性炭对NO_3的吸附和还原。在不存在氧气的情况下，NH_3的竞争性吸附会抑制NO的吸附，在存在氧气的情况下，NO_的吸附会显着增加。这种现象既不能用气相中的NO氧化来解释，也不能用活化的焦炭上产生氧化的表面来解释。提出了一种假设来解释该现象，这表明在活化焦炭的表面上至少存在两种​​类型的吸附位，其中一种吸附NO_2和/或氧化的NO物种而不是NO。 NO--NH_3--O_2反应通过ED机理和LH机理进行。随着温度在30--250°C范围内升高，NO转化率降低，这表明反应物特别是NH_3的吸附是限速步骤。

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