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首页> 外文期刊>Catalysis science & technology >The synergistic mechanism of NOx and chlorobenzene degradation in municipal solid waste incinerators
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The synergistic mechanism of NOx and chlorobenzene degradation in municipal solid waste incinerators

机译：氮氧化物和氯苯的协同机制退化的市政固体废物焚化炉

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The development of a selective catalytic reduction (SCR) catalyst that destroys both NOx and chlorobenzene (CB) has drawn considerable interest for controlling emissions from municipal solid waste incinerators. SCR catalyst deactivation that is caused by Cl-containing species is one of the most serious problems in actual operation. We developed a MnOx-CeO2 catalyst for simultaneous control of NOx and chlorobenzene and proposed a mechanism by which this occurs. The primary problem is that Cl can easily dissociate from CB and deposit on the catalyst surface via nucleophilic or electrophilic exchange effects between 200 and 300 degrees C. This leads to a considerable decrease in both redox properties and SCR performance. This passivation effect decreased the formation of undesired by-products, N2O or NO2, at high temperatures. CB adsorption was inhibited by competitive adsorption with excess NH3; however, CB catalytic destruction was improved by NO and O-2 at 300 degrees C, whether NH3 was present or not. The intermediate species, NH4NOx, or the product, NO2, during the SCR process accelerated the dechlorination process on the catalyst surface and the formation of HCl or chlorinated hydrocarbons (e.g. CCl4) instead of Cl-2. The long-term SCR activity depended mainly on the accumulation of Cl on the catalyst rather than competitive adsorption.
机译：选择性催化还原的发展(SCR)破坏氮氧化物和催化剂氯苯(CB)吸引了相当大的对控制排放的城市固体废物焚化炉。由于Cl-containing失活物种是最严重的问题之一实际操作。同时控制氮氧化物和催化剂氯苯和提出了一种机制,通过这种机制这发生。容易使分离CB和存款通过亲核或催化剂表面从200年到亲电子交换的影响300度c,这导致相当大降低氧化还原性质和可控硅的性能。不受欢迎的副产品的形成,一氧化二氮NO2在高温下。抑制过剩的竞争吸附氨;提高了没有和0 2在300摄氏度,是否氨是现在或不是。NH4NOx或产品、NO2在可控硅过程加速了脱氯过程催化剂表面和盐酸或的形成氯化碳氢化合物(例如亚兰)代替Cl-2。在Cl的积累,而催化剂比竞争吸附。

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