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HWAHAK KONGHAK,
Vol.25, No.3, 275-281, 1987
Vol.25, No.3, 275-281, 1987
Isobutyraldehyde에 의한 MoO3의 환원 및 환원된 MoO2의 산소에 의한 재산화반응
Kinetics of MoO3 Reduction with Isobutyraldehyde and Reoxidation of Reduced MoO2 with Oxygen
기체상태의 isobutyraldehyde에 의한 고체입자 MoO3의 환원반응과 산소에 의한 MoO2의 재산화반응을 반응온도 400∼600 ℃, isobutyraldehyde 분압 0.04∼0.17 atm 및 산소분압 0.3 atm에서 flow microbalance reactor를 사용하여 연구하였다.
Isobutyraldehyde에 의한 MoO3의 환원반응의 경우, isobutyraldehyde는 산화탈수소되어 거의 methacrolein으로 되었고, MoO3는 550 ℃ 이상에서는 완전히 MoO2로 환원되었으며 그 이하의 온도에서는 반응온도에 따라 MoO2로의 환원도에 차이가 있었다. 이러한 환원반응은 표면반응이 율속인 미반응각모델에 적용될 수 있었으며 활성화에너지는 15 Kcal/g mole이었다.
산소에 의한 MoO2의 재산화반응은 온도 450∼487 ℃에서 MoO2가 거의 MoO3로 재산화되었으며 ash layer를 통한 확산이 율속인 미반응각 모델에 적용될 수 있었다. 이때의 활성화에너지는 47 Kcal/g mole이었다.
Isobutyraldehyde에 의한 MoO3의 환원반응의 경우, isobutyraldehyde는 산화탈수소되어 거의 methacrolein으로 되었고, MoO3는 550 ℃ 이상에서는 완전히 MoO2로 환원되었으며 그 이하의 온도에서는 반응온도에 따라 MoO2로의 환원도에 차이가 있었다. 이러한 환원반응은 표면반응이 율속인 미반응각모델에 적용될 수 있었으며 활성화에너지는 15 Kcal/g mole이었다.
산소에 의한 MoO2의 재산화반응은 온도 450∼487 ℃에서 MoO2가 거의 MoO3로 재산화되었으며 ash layer를 통한 확산이 율속인 미반응각 모델에 적용될 수 있었다. 이때의 활성화에너지는 47 Kcal/g mole이었다.
The kinetics of the reduction of MoO3 with isobutyraldehyde and the reoxidation of reduced MoO2 with oxygen were studied in a flow microbalance reactor over the temperature range of 400 ℃ to 600 ℃, isobutyraldehyde partial pressure of 0.04-0.17 atm and oxygen partial pressure of 0.3 atm.
On the reduction of MoO3 with isobutyraldehyde, isobutyraldehyde was mainly dehydrogenated to methacrolein and MoO3 was completely reduced to MoO2 at higher temperature than 550 ℃. The degree of reduction of MoO3 to MoO2 was decreased with decrease in reaction temperature at lower temperatures. This reaction of MoO3 reduction with isobutyraldehyde could be explained by chemical reaction control in the unreacted core model and the activation energy was 15 Kcal/g mole.
On the reoxidation of MoO2 with oxygen over the temperature range of 450 ℃ to 487 ℃, MoO2 was almost reoxidized to MoO3 and its reaction model could be explained by diffusion control through ash layer. The activation energy of reoxidation of MoO2 with O2 was 47 Kcal/g mole.
On the reduction of MoO3 with isobutyraldehyde, isobutyraldehyde was mainly dehydrogenated to methacrolein and MoO3 was completely reduced to MoO2 at higher temperature than 550 ℃. The degree of reduction of MoO3 to MoO2 was decreased with decrease in reaction temperature at lower temperatures. This reaction of MoO3 reduction with isobutyraldehyde could be explained by chemical reaction control in the unreacted core model and the activation energy was 15 Kcal/g mole.
On the reoxidation of MoO2 with oxygen over the temperature range of 450 ℃ to 487 ℃, MoO2 was almost reoxidized to MoO3 and its reaction model could be explained by diffusion control through ash layer. The activation energy of reoxidation of MoO2 with O2 was 47 Kcal/g mole.
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