Mechanisms for formation of inorganic byproducts in plasma chemical processing of hazardous air pollutants
Mechanisms for formation of inorganic byproducts in plasma chemical processing of hazardous air pollutants
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有害空气污染物等离子化学处理中无机副产物的形成机制
DOI：
10.1109/28.777182
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发表时间：
1999
影响因子：
4.4
通讯作者：
Toshiaki Yamamoto
中科院分区：
文献类型：
--
作者：
S. Futamura;A. Zhang;Toshiaki Yamamoto
利用铁电填料床等离子体反应器研究了空气中有害污染物（Cl/sub 2/C=CCl/sub 2/、Cl/sub 2/C=CHCl、Cl/sub 3/C-CH/sub 3/、Cl/sub 2/CH /sub 2/Cl、CH/sub 3/Cl、CH/sub 3/Br和苯）及其分子探针（CH/sub 4/、CH/sub 3/-CH/sub 3/和CH/sub 2/=CH/sub 2/）和碳氧化物（CO/sub x/）的等离子体化学行为，以获得CO/sub x/和N/sub 2/O的形成信息。研究表明，CO在血浆中氧化为CO/sub - 2/是一个缓慢的反应，CO和CO/sub - 2/主要是由不同的前驱体引起的。同时实现等离子体中HAPs的完全氧化分解和CO作为化学原料的回收是有利的。N/sub 2/O的形成过程受HAP结构和氧浓度的影响。在Cl/sub - 2/C=CCl/sub - 2/和Cl/sub - 2/C=CHCl等烯烃气体分解过程中，大功率短停留时间操作可有效抑制N/sub - 2/O的生成。在CH/sub - 3/Cl和CH/sub - 3/Br的情况下，可能需要低比能密度操作来降低N/sub - 2/O浓度。在N/sub - 2/中加入2%的氧气，CO、CO/sub - 2/和N/sub - 2/O的产率和选择性发生显著变化，且氧浓度不是控制这些无机氧化物的良好因素。
Plasma chemical behavior of hazardous air pollutants (HAPs) (Cl/sub 2/C=CCl/sub 2/, Cl/sub 2/C=CHCl, Cl/sub 3/C-CH/sub 3/, Cl/sub 2/CH-CH/sub 2/Cl, CH/sub 3/Cl, CH/sub 3/Br and benzene), their molecular probes (CH/sub 4/, CH/sub 3/-CH/sub 3/, and CH/sub 2/=CH/sub 2/), and carbon oxides (CO/sub x/) was investigated with a ferroelectric packed-bed plasma reactor to obtain information on the formation of CO/sub x/ and N/sub 2/O. It has been shown that the oxidation of CO to CO/sub 2/ is a slow reaction in plasma, and that CO and CO/sub 2/ mainly result from different precursors. Simultaneous achievement of complete oxidative decomposition of HAPs in plasma and recovery of CO as a chemical feedstock could be favorable. The process of N/sub 2/O formation is affected by HAP structures and oxygen concentration. In the decomposition of olefinic HAPs, such as Cl/sub 2/C=CCl/sub 2/ and Cl/sub 2/C=CHCl, high-power short-residence-time operations are effective in suppressing N/sub 2/O formation. In the cases of CH/sub 3/Cl and CH/sub 3/Br, low specific energy density operations could be necessary to reduce N/sub 2/O concentrations. The yields and selectivities of CO, CO/sub 2/ and N/sub 2/O change drastically by adding only 2% of oxygen to N/sub 2/, and oxygen concentration is not a good factor to control these inorganic oxides.