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HWAHAK KONGHAK,
Vol.26, No.5, 473-479, 1988
Vol.26, No.5, 473-479, 1988
12-몰리브도인산계 촉매상에서 Isobutyraldehyde로부터 Methacrolein으로의 산화탈수소반응
The Oxidative Dehydrogenation of Isobutyraldehyde to Methacrolein over a Series of 12-Molybdophosphoric Acid
알칼리 및 알칼리토금속으로 치환된 12-molybdophosphates 촉매상에서 isobutyraldehyde로부터 methacrolein으로의 산화탈수소반응을 고정층반응기로 상압하에서 실시하였다. 촉매의 제조는 Tsigdinos 제조법에 따라 행하였으며 X-ray 및 FT-IR를 사용하여 그 구조를 확인하였다. 반응실험결과 대부분의 촉매에서 90 % 정도의 높은 MAC 선택률을 보였으며 Cs염의 경우 95 %로 가장 좋은 선택률을 보였다. 이와같이 비교적 높은 선택률을 보인 것은 헤테로폴리산 촉매의 Keggin구조중 bridge oxygen이 isobutyraldehyde의 산화탈수소반응에 탁월한 기능을 가지고 있으며 생성물인 물에 의해 부반응들이 억제되었기 때문인 것으로 사료된다.
The catalytic oxidative dehydrogenation of isobutyraldehyde to methacrolein over 12-molybdophosphoric acid and its alkali & alkaline earth metal salts has been studied at atmospheric condition in a flow reactor system.
Catalysts were prepared by Tsigdinos method and these compositions and structures were verified by X-ray diffraction and FT-IR.
Most catalysts showed about 90 % selectivity and among them Cs salt was best.
This valuable catalytic result is maybe related with the dehydrogenation function of the bridge oxygen on the catalyst and the effective inhibition of side reactions by water interaction with catalyst.
Catalysts were prepared by Tsigdinos method and these compositions and structures were verified by X-ray diffraction and FT-IR.
Most catalysts showed about 90 % selectivity and among them Cs salt was best.
This valuable catalytic result is maybe related with the dehydrogenation function of the bridge oxygen on the catalyst and the effective inhibition of side reactions by water interaction with catalyst.
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