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CuHY 및 CuNaY형 Zeolite 촉매에 의한 일산화탄소의 산화

Oxidation of Carbon Monoxide on Zeolites Type CuHY and CuNaY

HWAHAK KONGHAK, February 1976, 14(1), 31-36(6), NONE
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Abstract

화우자싸이트형 제오라이트, CuHY와 CuNaY에 대한 일산화탄소의 촉매산화활성을 제오라이트내의 2가 동이온의 양을 변화시키며 구했다. CuHY에 대하여서는 동이온 42 % 교환점에서 현저한 산화활성의 증가가 있었으나 CuNaY에는 그러한 현상이 없었다. 그러나 후자의 경우는 온도가 350 ℃ 정도 상승했을 때 같은 정도의 교환점에서 산화활성의 최소점이 있었다.
2가 동이온이 42 %이하이고, 온도가 270 ℃보다 낮은 범위에서는 CuHY와 CuNaY의 활성화에너지가 각각 6 및 20 Kcal/mole이었다. 그러나 동이온의 교환이 42 %를 넘어서면 활성화에너지의 이러한 현저한 차이는 없어지고 12 Kcal/mole가 되었다. 이는 동이온만의 효과때문으로 생각된다. 270 ℃보다 반응온도가 크면 CuHY에 대하여는 전화율이 1에 가까워져 활성화 에너지의 측정이 불가능하였으나 CuNaY에 대하여서는 이보다 낮은 온도에서 구한 20 Kcal/mole와 같은 값을 나타내며 이는 동이온함량에 무관하다. 따라서 온도상승으로 동이온보다 나토리움이온의 영향이 커지기 때문이다.
Catalytic oxidation activities of carbon monoxide on faujasite zeolite, CuHY and CuNaY, were measured by controlling cupric ion exchange level in the zeolite. A significant increase in the oxidation activity was observed to occur at 42 % cupric ion exchange level on CuHY, but this was not the case with CuNaY. Nevertheless, in the latter kinetics, there appeared a minimum oxidation activity at the same ion exchange level when temperature was raised up to 350 ℃. In the cupric ion exchange level below 42 % and the temperature range lower than 270 ℃ the activation energy of the kinetics on CuHY and CuNaY showed 6 and 20 Kcal/mole respectively. However, as the cupric ion exchange level increased beyond 42 % such a distinguishable difference in activation energy between two solids disappeared giving the value of 12 Kcal/mole. It is probably due to only the effect of cupric ion under these circumstances. In the temperature range higher than 270 ℃ the activation energy on CuHY could not be measured due to complete conversion of reactants but on CuNaY revealed the same value of 20 Kcal/mole as that observed in the lower temperature range, independent of the cupric ion exchange level. This implies that the influence of sodium ion became prevaillng over the cupric ion.

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