Zhang Aihua, Futamura Shigeru, Yamamoto Toshiaki
a National Institute for Resources and Environment , Tsukuba , Ibaraki , Japan.
b Osaka Prefecture University , Sakai , Osaka , Japan.
J Air Waste Manag Assoc. 1999 Dec;49(12):1442-1448. doi: 10.1080/10473289.1999.10463977.
Nonthermal plasma chemical decomposition of bromomethane (CHBr) was investigated with a coaxial type packed-bed plasma reactor. It has been demonstrated that plasma chemical processing is an effective approach to decompose CHBr in a wide concentration range. It has been shown that CHBr decomposition reactivity depends on reactor operating factors such as background gas, O concentration, and humidification. Higher decomposition efficiencies can be obtained in dry N. However, organic byproducts such as BrCN are concurrently produced under deaerated conditions. Water suppresses CHBr decomposition and also affects the yields of CO (CO and CO) and organic byproducts due to the involvement of some active species generated from water. The presence of O retards CHBr decomposition by quenching high-energy electrons, while it suppresses organic byproducts and improves CO yield. The reacted carbons in CHBr are recovered as CO almost quantitatively in air. Higher CO selectivities cannot be achieved by increasing O concentration. NO formation, which is accompanied by CHBr decomposition, can be effectively suppressed by decreasing O concentration down to 2%. Furthermore, reaction mechanisms are discussed by comparing the reactivities of CHBr and its congeners.
采用同轴型填充床等离子体反应器对溴甲烷（CHBr）的非热等离子体化学分解进行了研究。结果表明，等离子体化学处理是在宽浓度范围内分解CHBr的有效方法。研究表明，CHBr分解反应活性取决于反应器操作因素，如背景气体、O浓度和湿度。在干燥的N中可获得更高的分解效率。然而，在脱气条件下会同时产生诸如BrCN等有机副产物。水会抑制CHBr分解，并且由于水产生的一些活性物种的参与，还会影响CO（CO和CO）和有机副产物的产率。O的存在通过淬灭高能电子阻碍CHBr分解，同时它抑制有机副产物并提高CO产率。CHBr中反应的碳在空气中几乎定量地以CO形式回收。通过增加O浓度无法实现更高的CO选择性。通过将O浓度降低至2%，可以有效抑制伴随CHBr分解产生的NO形成。此外，通过比较CHBr及其同系物的反应活性来讨论反应机理。
