光化学反応による微粒子化を利用したガス状汚染物質の除去に関する研究 -窒素酸化物とベンゼン, トルエン, キシレンの除去- [in Japanese] Removal of Gaseous Pollutants Using Photochemical Aerosol Formation -Removal of Nitrogen Oxides and Benzene, Toluene or Xylene- [in Japanese]
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We have been researching air cleaning technology using gas-to-particle conversion of atmospheric gaseous pollutants by UV light irradiation. We measured removal efficiency of NO<SUB>x</SUB> and typical aromatic hydrocarbons ; benzene, toluene and o-xylene(BTX) , by the irradiation with a high power UV (with 184.9 nm wavelength) lamp. The removal efficiencies of NO<SUB>x</SUB> and BTX increased with increasing water vapor concentration. And 78-91 % NO<SUB>x</SUB> removal efficiencies were achieved in 50 % RH. The removal efficiencies of benzene, toluene and o-xylene in 50 % RH were 64 %, 82 % and 90 %, respectively, which could be related to their chemical reaction rate with OH radicals. Larger particles were formed in NO-BTX-air systems than in a NO-air system. The decrease in the removal efficiency of NO<SUB>x</SUB> by the addition of BTX could be ascribed to the competitive reaction of OH radicals with NO<SUB>x</SUB> and BTX. The obtained experimental results suggest that hybrid air cleaning systems to remove both paniculate and gaseous pollutants from the air could be built in conjunction with catalyst and air filters.
- Earozoru Kenkyu
Earozoru Kenkyu 11(4), 349-356, 1996-12-20
Japan Association of Aerosol Science and Technology