Influence of H2 on the decomposition of halides by nonthermal plasma incorporated with in situ alkaline absorption

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• 作者：Takafumi Fujita ; Takayuki Kawano ; Liwei Huang ; Yoshihiro Kojima ; Hitoki Matsuda and Koichi Ushiroebisu
• 关键词：Nonthermal plasma ; Halides ; Hydrogen ; Decomposition ; In situ absorption
• 刊名：Journal of Material Cycles and Waste Management
• 出版年：2007
• 出版时间：March, 2007
• 年：2007
• 卷：9
• 期：1
• 页码：15-20
• 全文大小：369 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Waste Management and Waste Technology
  Environmental Management
  Industrial Pollution Prevention
  
• 出版者：Springer Japan
• ISSN：1611-8227

文摘

To control the emission of halides into the environment, an experiment on the nonthermal plasma decomposition of the halides CF₄, CHF₃, C₂HCl₃, and CHClF₂ was conducted in a wire-in-tube corona reactor. It was found that the decomposition of C₂HCl₃ and CHClF₂ was easy compared with the decomposition of CF₄ and CHF₃. With the addition of H₂ in N₂ gas, the decomposition ratio of CF₄, C₂HCl₃, and CHClF₂ increased. In contrast, the decomposition ratio of CHF₃ in a hydrogen-rich atmosphere was lower than that in an N₂ atmosphere. It was demonstrated that the yields of HF and/or HCl formed during halide decomposition clearly increased in the presence of H₂ in N₂ gas. Furthermore, in order to prevent the production of unwanted products from halide decomposition, a combination of plasma decomposition and in situ alkaline absorption was devised by coating a layer of Ca(OH)₂ onto the surface of the grounding electrode. It was demonstrated that the Ca(OH)₂ sorbent played an effective role as a scavenger, participating in halide decomposition by capturing reaction products such as HCl and HF, therefore resulting in increased halide decomposition.