여러 가지 산촉매상에서 CFC-113의 산화분해

지영철; 장원철; 이태진

HWAHAK KONGHAK, Vol.34, No.4, 424-428, August, 1996

Export Citation

여러 가지 산촉매상에서 CFC-113의 산화분해

Oxidative Decomposition of CFC-113 on Various Acidic Catalysts

지영철, 장원철, 이태진

초록

CFC-113의 산화분해 반응을 다양한 금속산화물 촉매상에서 대기압, 500℃, 0.5% CFC-113의 몰비로 관형 흐름반응기에서 수행하였다. 알루미나, 제올라이트, 티타니아-실리카 등과 같은 산촉매들은 높은 분해활성을 나타내었지만, Fe₂O₃, ZnO, TiO₂, SiO₂, CaO 등은 활성이 낮았다. TiO₂- SiO₂(Ti/Si=50/50)촉매는 조사된 산촉매들 중에서 가장 좋은 활성유지도와 CO₂로의 높은 선택도를 보였다. 그러나, 이 촉매에서도 Si성분이 반응생성물인 무기할로겐과 반응하는데 기인하여 비활성화가 일어났다. 이러한 무기할로겐에 대한 내구성을 높이기 위해서 황산으로 변형시킨 고체 초강산촉매(TiO₂-SiO₂/SO₄^2- : Ti/Si=50/50)를 제조하였다. DSC로 산점의 분포를 측정하여 반응활성종이 강산점임을 입증하였다. 이러한 초강산촉매는 시험된 모든 촉매들 중에서 가장 높은 활성과 내구성을 보였다.

The catalytic oxidative decomposition of CFC-113 was carried out on various metal oxides at atmospheric pressure, 500℃, and CFC-113 feed mole percent of 0.5 using a tubular flow reactor. Acid catalysts such as aluminas, zeolites, and titania-silica exhibited high decomposition activities, whereas the activities of Fe₂O₃, ZnO, TiO₂, SiO₂, and CaO were low. TiO₂-SiO₂catalyst showed the best performance regarding retention of activity and high selectivity to CO₂among the acid catalysts investigated. However, it was found that deac- tivation of catalyst occurred because Si in TiO₂-SiO₂(Ti/Si=50/50) reacted with inorganic ha- logens(fluorine and chlorine)which were reaction products. Solid superacid catalyst(TiO₂-SiO₂/ SO₄^2-:Ti/Si=50/50) modified with H₂SO₂was prepared for high durability against inorganic ha- logens. The acid sites distribution of the catalyst was measured by DSC. The result sugge- sted that strong acid sites were active sites. This superacid catalyst showed the highest ac- tivity and durabitity among the catalysts examined.

Keywords:CFC-113;Oxidative Decomposition;Acid Catalysts;Titania-Silica

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[22] Imamura S, Tarumoto H, Ishida S, Ind. Eng. Chem. Res., 28, 1449 (1989)

[23] Mizuno K, Fujii Y, Tajima M, Kinuma R, Aizawa Kushiyama S, Kobayashi S, Ohuchi H, Proc. Fukuoka Int. Symp. '90, Fukuoka (1990)

[24] Nagata H, Takakura T, Tashiro S, Kishida M, Mizuno K, Tamori I, Wakabayashi K, Appl. Catal. B: Environ., 5(1-2), 23 (1994)

[25] Nakamato K, "Infrared and Raman Spectra of Inorganic and Coordination Compounds," 3rd Ed., p. 241, John Wiley & Sons, New York (1978)

[26] John LG, Douglas LH, Barry D, Environ. Sci. Technol., 20(7), 703 (1986)