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전이 금속 산화물이 담지된 La/Al 복합산화물 촉매상에서의 메탄 연소반응
Methane Combustion on Transition Metal Oxide Impregnated La/Al Oxide Catalysts
HWAHAK KONGHAK, December 1993, 31(6), 667-674(8), NONE
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Abstract
La/Al 복합산화물(Al2O3/La2O3=19)에 한종의 전이금속을 담지시킨 후 대기중에서 소성처리하여 연소촉매를 제조하고 메탄 연소반응을 실시하였다. X선 회절 분석결과 La/Al 복합산화물은 1200℃이상에서 무정형으로부터 La-β-Al2O3로 상전이가 일어났다. 구리가 담지된 경우에는 결정성장이 촉진되는 반면에 크롬이 담지된 경우에는 결정성장이 억제되었다. 소성온도의 증가에 따라 촉매 표면에서의 구리의 조성은 점차 감소하여 고용체(solid solution)가 형성되는 것으로 보이며, 크롬은 Cr2O3의 상태로 대부분 표면에 존재하는 것으로 나타났다. 메탄연소반응에 대한 촉매활성은 1200℃에서 소성퍼리한 시료에서는 구리, 크롬>철>망간>코발트>니켈이 담지된 순으로 활성을 나타내었다. 구리가 담지된 La/Al 복합산화물은 소성온도의 증가에 따라 활성이 감소하였으나 크롬이 담지된 경우에는 1400℃까지 촉매활성이 거의 일정하게 유지되었다.
Combustion catalysts were prepared by the impregnation of transition metal oxide on La/Al oxide(Al2O3/La2O3=19), and then calcined in air. Methane combustion was carried out using these catalysts. X-ray diffraction analysis indicates that La/Al oxide was crystallized from amorphous form into La-β-Al2O3 phase above 1200℃. Crystallization was accelerated by the addition of copper on La/Al oxide, but it was retarded by the addition of chromium on La/Al oxide. The copper content of the surface of CuO-La/Al oxide decreased as the calcination temperature increased. This result indicates the formation of solid solution. In case of Cr2O3-La/Al oxide, Cr2O3 mainly existed on the catalyst surface. The activities of catalysts calcined at 1200℃ appeared as the following order; CuO, Cr2O3>Fe2O3>MnO>CoO>NiO. The catalytic activity of CuO-La/Al oxide decreased as the calcination temperature increased. However the catlytic activity of Cr2O3-La/Al oxide was still maintained after calcination at 1400℃.
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