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Issue
Korean Chemical Engineering Research,
Vol.51, No.5, 531-535, 2013
Fe 이온이 담지된 BEA 제올라이트 촉매의 열처리 온도에 따른 N2O 분해반응에 대한 영향
Effect of Fe Ion-Exchanged BEA Zeolite Catalysts on N2O Decomposition Reaction Following Heat-treatment Temperatures
정기림, 이승재, 유인수, 문승현
철 이온을 담지시킨 BEA 제올라이트에서 N2O가 분해되는 반응을 조사하여 열처리 온도가 촉매의 활성에 미치는 영향을 고찰하였다. N2O 분해 반응 실험 결과, Fe/BEA 촉매에 대한 열처리 온도가 증가함에 따라 N2O 분해 활성이 현저히 줄어들었다. 열처리 온도의 증가에 따른 Fe/BEA 촉매의 입자모양 및 크기의 변화는 크지 않았지만, 열처리 온도 증가에 따라 비표면적이 크게 줄어들었다. 또한 열처리온도가 증가함에 따라 β 구조의 결정성이 크게 낮아지는 것을 확인하였고, 열처리 온도가 높아질수록 SiO 구조는 증가하거나 크게 변화가 없는 반면, Fe가 골격구조와 결합된 구조는 감소하는 것으로 판단되었다. 이와 같은 결과로 열처리 온도의 증가에 따라 알루미늄과 Fe가 결합된 β 구조가 붕괴되어 N2O 분해활성이 크게 저하되는 것으로 사료된다.
The effect of heat-treatment temperature on the activity of catalysts was studied by investigating N2O decomposition reaction in Fe ion-supported BEA Zeolite. As a result of N2O decomposition reaction experiment, N2O decomposition activity significantly decreased as heat-treatment temperature of Fe/BEA catalyst increased. the shape and size of the particles of Fe/BEA catalyst following the rise of heat-treatment temperature did not display a significant change. But following the rise of the heat-treatment temperature, its surface area was significantly reduced. Also it was confirmed that as the heat-treatment temperature rose, the crystallization of β structure was greatly reduced. And as heattreatment temperature rose, while SiO structure either increased or did not exhibit much change, the structure of Fe bonded with lattice structure was speculated to decrease. From the stated results, it was concluded that the increase of heat-treatment temperature became the cause of the declined activity of catalysts by destruction of its β structure of bonding aluminium and Fe atoms.
Keywords: N2O; Catalyst; Zeolite; Heat Treatment; Structure
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