Characteristics of Residual Ozone Decomposition with Commercial Ozone Decomposition Catalyst (ODC) and Photo catalyst

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(1)대학기계학회 2004년도 춘계학술대회 논문집.

(2) · · † *. *. Characteristics of Residual Ozone Decomposition with Commercial Ozone Decomposition Catalyst (ODC) and Photo catalyst Jeong-Hoon Byeon, Jae-Hong Park, Jung-Ho Hwang Key Words :. Ozone Decomposition Catalyst (ODC), Photo catalyst, Ozone Decomposition () Abstract. Decomposition of ozone at room temperature was investigated comparatively with commercial monolithic ozone decomposition catalyst (ODC, MnO2) and monolithic photo catalyst (TiO2). The effects of residence time, UV (ultraviolet) light dependence and ozone concentration on the conversion was presented. UV ray was irradiated using BLB (black light blue) lamp (315~400 nm), supplied with a constant intensity in the reactor. The concentration of ozone in the square-shape reactor can be controlled by combining the DBD (dielectric barrier discharge) reactor with an AC high voltage supply system. The catalytic performance, in presence of UV irradiation did not show significant changes for MnO2 catalyst. TiO2 catalyst was the different case, which showed higher decomposition activity in presence of UV irradiation. Deactivation of catalyst detected by real – time ozone monitor for 120 hours with a constant inlet ozone concentration.. 1.. . . ozone

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(9) 대학기계학회 2004년도 춘계학술대회 논문집. . ., BC * , XG/ 1001400 ppmNM,á/2¢4 È /I %' ¼½^ Ò¿ "#$ NÓ,pelectronhole 3i#2¼½#'-3®AÂ3 4 4. Table 1 Methods for treatment of residual ozone Phase. Gaseous Ozone. Method Adsorption with AC Catalytic Decomposition Thermal Decomposition Bath Washing Soil Decomposition. £^@.,ABC£f¤ #3

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(12) ' -ÙÚTy$,|]ÛÜ Ý 36| Ý3d^Þ bioaerosol ] /012X\4 Î¼½ Ò ¿ ß&2d à® }0^ Ó14 . hv 3.2 eV. TiO2. h+ + e(6) e + O3 O3 (7) h+ + OH- OH (8) O3- + O3 O4- + O2 (9) OH + O3 O4- + H+ (10) O4- + O3 2O2 + O3(11) (12) H+ + O3- + O4- 3 O2 + OH(6)a ¼½ Ò¿ , p ^ , 2 3X, (7)a (6)a i# p â3;@ i# 3, (8)a (6)a i# 3 ãäå (hydroxyl group) ãäå æç (radical)3 i#2 34. (9)a (7)a i# â3;3 O4 â3; . i#2 3X, (10)a (8)a i# ãäå æç 3 O4 â3; 3;3 i #2 34. (11)a (9) (10)a i# O4 â3;3 J Í . â3;@ È# 3X, (12)a (9) (10)a i# 3;, O4 â3; (11) 3;3 3 Í . ãä^^ pÖ2 ., èß @ _f4. pI éê 3 A \4. hv 3.2 eV. 2O3. 3O2. (13). TiO2. ë ÏÆ +ì0^ ]í-î½2 ©ï |È (monolithic shape) .,¼½ (MnO2) Î¼½ (TiO2) \d ] ð#Ê gáñ ò f #Êl% f ¾#@ Ì 0^ ºH Ô4.. 2..

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(14) 대학기계학회 2004년도 춘계학술대회 논문집. Table 2 Basic Information of Catalysts Size of Catalys t Bed (L*W* D, cm3). Mesh Size (#/in). Bed Material. Preparation Method. Additives (absorber). MnO2. 5*5*4.5. 14. Alumina. Impregnation. -. TiO2. 5*5*4.5. 10. Inorganic Paper. ImpregnationCoating. Activated Carbon, Zeolite. ôimpregnatedBCf ÔXÎ¼½ ,3%õ¡öTiO23~#«] ÷3ø ù] ú ©ï |È ûè3 inorganic paperôIô8üýþ33 drBCf Ô4. ¼½ pIj3 1 3 X A Â, .,¼½ BC 1 3 ©J 3, Î¼½ BC TiO2, ~#«, ]÷3ø Ë·3 0.2, 0.5, 0.3 3¢4. 36f ÌNM + ì0^ ]í$î½2.,¼½Î¼½ f}0H¾#@ ]b 7@ XZ Ô Â²34 3 3 XZ ¼½ 0&f]Nz ^]íf¼½ fð » 7¡¢4 % 3Ìgh?Æ# Ô4. (compressor)7;}ø (oil trap) $jN regulator? K X 8 ºM N diffusion dryer HEPA (high efficiency particulate filter)^ Æ# % á| (air filtering system)@ Kf4 % á|@ Kfc% &'( # ' !!)*,$j3 + ^ N4 N $j 3 , - HzÈ ø^$

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(21) 대학기계학회 2004년도 춘계학술대회 논문집. 3.. 100. 3.1 UV ë ÏÆ +ì1 .,¼½ Î¼½ .,¾#@ % \d k&l? X 56 NÓ NM ¼½ IEáñ@ l%á 56 t? on, off '@ Â, G/ ? 5 30 ppm ^ N ^ Ô4. I Eáñ3 0.0375 sec 1.35 sec H N M G/ 5 30 ppm } Â . ,¶· F 1 15 % F 0.4 11 %^ 2¢4. IEáñ ( ¸ .,¶· ¿È0^ ( BV@ »ÔX, G/ µ NM #Ê3 IEáñ3 H BC F 0.6 4 %/ Äâ@ ºH Ô4.. Ozone Conversion (%). 90 UV off (TiO_2). 80. UV on (TiO_2). 70. UV off (MnO_2) UV on (MnO_2). 60 50 40 30 0.0100. 0.1000. 1.0000. 10.0000. Residence Time (sec). Fig. 3 Initial Ozone Conversion (at 5 ppm) 3.2

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