Electron beam treatment of gas stream containing high concentration of NOx: An in situ FTIR study
Electron beam treatment of gas stream containing high concentration of NOx: An in situ FTIR study
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DOI：
10.1016/j.cej.2013.06.019
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发表时间：
2013-08
影响因子：
15.1
通讯作者：
P. Lakshmipathiraj;Jing-qiu Chen;M. Doi;N. Takasu;S. Kato;A. Yamasaki;T. Kojima
中科院分区：
文献类型：
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作者：
P. Lakshmipathiraj;Jing-qiu Chen;M. Doi;N. Takasu;S. Kato;A. Yamasaki;T. Kojima
在两种不同的反应器中，研究了电子束(EB)脱除气流中NOx的流动条件。首先制造了I型反应器来考察NOx的脱除性能，在此基础上设计了II型反应器来进一步研究NOx的脱除效率。研究了外加电流、氧气、水蒸气和气体流量对脱除NO和NOx的影响。电子束辐照后的NO气体样品的FTIR光谱表明有NO2和N2O的生成。实验结果表明，利用II型反应器，NOx浓度可从初始的1000ppm降至95%，并对电子束辐照脱除NOx的可能机理进行了探讨。推测在无氧条件下，电子束辐照加速了NO还原为N_2和O_2。在电子束辐照下，在NO/N_2气流中添加O_2和水蒸气分别影响氧化和还原反应。气体的Na2SO3洗涤提高了EB处理过程中NOx的脱除性能。观察到，在电子束辐照过程中，N2O主要是由NO2还原形成的。
The NOxremoval from gas stream by electron beam (EB) technique under flow through condition was investigated using two different reactors. Initially reactor type I was fabricated to investigate the NOxremoval performance, based on its performance, the reactor type II was designed for further investigation on NOxremoval efficiency. The influence of the applied current, O2, water vapour and gas flow rate on the removal of NO and NOxwas studied. The FTIR spectrum of the NO gas samples acquired after EB irradiation indicated the formation of NO2and N2O. It was observed that the NOxconcentration could be reduced to 95% from the initial NO concentration of 1000 ppm using reactor type II. The possible removal mechanism of NOxunder EB irradiation is discussed. It is inferred that the EB irradiation accelerate the reduction of NO to N2and O2in the absence of O2. Addition of O2and water vapour in the NO/N2gas stream was found to influence the oxidation and reduction reaction, respectively under EB irradiation. The Na2SO3scrubbing of the gas increased the NOxremoval performance during EB processing. The N2O was observed to form mainly by the reduction of NO2during EB irradiation.