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

被引:5
作者
Fujita, Takafumi [1 ]
Kawano, Takayuki [1 ]
Huang, Liwei [2 ]
Kojima, Yoshihiro [3 ]
Matsuda, Hitoki [1 ]
Ushiroebisu, Koichi [4 ]
机构
[1] Nagoya Univ, Dept energy engn & Sci, Chikusa Ku, Aichi 4648603, Japan
[2] Zhejiang Univ Technol, Coll Biol & Environm Engn, Hangzhou 310027, Peoples R China
[3] Nagoya Univ, EcoTopia Sci Inst, Nagoya, Aichi, Japan
[4] Sintokogio Ltd, Res & Dev Div, Aichi 4440104, Japan
关键词
nonthermal plasma; halides; hydrogen; decomposition; in situ absorption;
D O I
10.1007/s10163-006-0166-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 H-2 in N-2 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 N-2 atmosphere. It was demonstrated that the yields of HF and/or HCl formed during halide decomposition clearly increased in the presence of H-2 in N-2 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.
引用
收藏
页码:15 / 20
页数:6
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