화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.12, No.5, 511-516, August, 2001
Export Citation
초임계 반응매개에서 BTX 촉매산화의 산소몰농도 효과
Catalytic Oxidation of BTX in Supercritical Reaction Media with Varible Oxygen Concentration
이승범, 김진모, 홍인권, 김형진1, †
  • 단국대학교 화학공학전공, 서울 140-714
  • 1김포대학 환경토목과, 김포 415-870
Seung Bum Lee, Jin Mo Kim, In Kwon Hong, and Hyung Jin Kim1, †
  • Department of Chemical Engineering, Dankook University, Seoul 140-714, Korea
  • 1Department of Environmental & Civil Engineering, Kimpo College, Gimpo 415-870, Korea
E-mail:
초록
휘발성 유기화합물(VOC(s))의 촉매산화공정에서 반응매개 특성을 고찰하기 위해 고압의 공기와 초임계 상태의 이산화탄소를 반응매개로 하여 실험을 수행하였으며, 촉매로는 Pt/γ-Al2O3 촉매를 사용하였다. 고압공기에서 benzene, toluene, m-xylene (BTX)의 완전산화 전환율은 유입농도에 반비례하며 반응온도와 압력에 비례하였다. Off-line 시료들로부터 BTX의 부분산화 생성물들의 존재가 확인되었다. 초임계 이산화탄소 반응매개의 경우 고압공기에서와 같은 경향을 보였으며, 고압공기에서의 완전산화 전환율보다 높은 전환율을 확인할 수 있었다. 이는 초임계 이산화탄소에서 BTX의 증가된 용해도에 의해 설명될 수 있다. 검출된 중간생성물들은 고압공기에서의 경우와 유사하였다. 이산화탄소에 대한 산소의 비를 감소시킨 결과 중간생성물의 양도 감소하였다. 산소 대 이산화탄소의 비가 1:16일 때 완전산화 전환율은 일정한 값으로 유지되었으며, 중간생성물은 생성되지 않음을 알 수 있었다.
The catalytic oxidation of volatile organic compounds (VOCs), which were benzene, toluene and m-xylene (BTX), was studied on a Pt/γ-Al2O3 catalyst. In high pressure air, the deep oxidation conversion of BTX was increased with decreasing the inlet concentration and increasing the reaction temperature and pressure. Many intermediates, which were produced by the partial oxidation of BTX, were detected from off-line samples. The supercritical carbon dioxide (SC-CO2) was used as reaction media. In SC-CO2 media, the deep oxidation conversion of BTX was increased with the increases of temperature and pressure. The deep oxidation conversion in SC-CO2 media was better than that in air media at same pressure condition. This can be explained by the solubility of BTX in SC-CO2. The intermediates were similar to those of high pressure reaction. The amount of intermediates was decreased as the molar ratio of oxygen to carbon dioxide was decreased. Then the molar ratio of oxygen to carbon dioxide was 1:16, the yield of deep oxidation was kept constant and the intermediates were not detected.
Keywords:catalytic oxidation;VOCs;VTX;Pt/γ-Al2O3 catalyst;supercritical reaction media
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