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Al2O3-TiO2 혼합담체에 담지한 크롬산화물 촉매상에서 NO의 NH3에 의한 선택적 촉매 환원반응
Selective Catalytic Reduction of NO by NH3 over Chromia Catalysts Supported on Al2O3-TiO2
HWAHAK KONGHAK, October 1999, 37(5), 623-627(5), NONE
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Abstract
Al2O3-TiO2 혼합담체에 담지된 크롬산화물 촉배상에서 TiO2의 변화량에 따른 NH3의 선택적 환원반응을 고정층 연속식 흐름 반응기에서 알아보았다. Al2O3-TiO2 혼합담체에 담지된 크롬산화물 촉매의 경우 Al2O3에 담지된 경우와 비슷한 질소산화물 제거활성을 가짐을 확인할 수 있었다. Al2O3-TiO2 혼합담체에 담지된 크롬산화물 촉매의 질소산화물 제거활성은 활성성분으로 알려진 Cr6+의 양과 직접적인 상관 관계를 보이지 않았으며, NH3 TPD를 통해 측정된 촉매의 표면 산도가 반응활성과 더욱 밀접한 관계를 가짐을 확인할 수 있었다. 또한, Al2O3-TiO2 담체를 사용한 경우 Al2O3만을 담체로 사용한 경우보다 상대적으로 SO2에 대한 내구성이 다소 증가하였다.
the NO removal activity and sulfur tolerance of chromia catalyst supported on Al2O3-TiO2 with respect to the contents of TiO2 were examined in a fixed bed flow reactor for the selective reduction of NO by NH3. By XPS analysis, it was observed that the content of Cr6+ on the catalyst surface, a known active reaction site for the catalyst surface examined by NH3 TPD may play an important role for this reaction system. The chromia catalyst on the mixed supports developed in the present study showed a slight improvement for its sulfur tolerance by SO2 compared to the catalyst supported on Al2O3 alone.
Keywords
References
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Nam IS, Eldridge JW, Kittrell JR, Ind. Eng. Chem. Prod. Res. Dev., 25, 192 (1986)
Clarebout G, Ruwet M, Matralis H, Grange P, Appl. Catal., 76, L9 (1991)
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Rodenas E, Yamaguchi T, Hattori H, Tanabe K, J. Catal., 69, 434 (1981)
Matralis HK, Ciardelli M, Ruwet M, Grange P, J. Catal., 157(2), 368 (1995)
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Stranick MA, Houalla M, Hercules DM, J. Catal., 106, 362 (1987)
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