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A-2.2.4 Development of Techniques for Decomposition of Brominated Organic Com pounds

[Contact Person]

Takashi Ibusuki
Director
Atmospheric Environmental Protection Department
National Institute for Resources and Environment
16-3 Onogawa, Tsukuba, Ibaraki, 305-8569 Japan
Tel:+81-298-58-8250 Fax:+81-298-58-8258
e-mail:ibusuki@nire.go.jp

Total budget for FY1996-FY1998

46,688,000 Yen (FY1998 4,999,000 Yen)

Abstract

Three different methods were investigated for the abatement of bromomethane emitted from stationary sources such as quarantine facilities: catalytic decomposition, nonthermal plasma chemical decomposition, and photocatalytic decomposition. In the catalytic decomposition of bromomethane, Cu-doped WO₃/Al₂O₃-ZrO₂ was the most effective catalyst to promote its oxidative decomposition at 400^治C. Nonthermal plasma afforded a reaction medium where 1,000 to 2,000 ppm of bromomethane in N₂-O₂ (98:2 v/v) was decomposed in higher than 90 % conversions at 1.5 to 4.4 s of residence time. Practicai application of this method is promising because 1,000 ppm of bromomethane in dry N₂ can be decomposed almost quantitatively at 0.9 s of residence time with a pulsed corona reactor on a semibench scale. The initial concentration of bromomethane affected its photocatalytic decomposition behavior, and 2,000 ppm of bromornethane was completely photodecomposed in 8 h with a newly prepared TiO₂ catalyst, HDep.

[Key Words]

Bromomethane, Decomposition. Catalyst, Nonthermal plasma, Photocatalyst