HWAHAK KONGHAK, Vol.21, No.6, 293-304, December, 1983
Cu-Co-Cr계 촉매에 의한 Alcohol 합성연구
A Study on the Synthesis of Alcohols with Cu-Co-Cr Catalyst
초록
Copper, Cobalt, Chrome 산화물에 Potassium oxide가 알칼리로서 첨가된 촉매를 제조하였으며, X-선회절분석 결과 결정성이 낮은 Cupric oxide와 Chromite의 혼합물에 가까운 특성을 나타내었고 BET 표면적은 19.5 ㎡/g이었다. 이 촉매는 Carbon monoxide와 Hydrogen 으로부터 저온, 저압에서 Methanol을 주로 한 Alcohols의 합성에 좋은 활성을 보여 주었으며 300 ℃이상에서는 많은 higher alcohols을 생성시킬 수 있음을 보여 주었디. 반응의 기구는 Trimolecular surface reaction을 rate determining step으로 한 Langmuir-Hinshelwood mechanism으로 표현했을 때 잘 일치하였으며 280o에서의 속도식은 다음과 같이 표현할 수 있었다.
γ = fcof2H2-fCH3OH/Keq / （A+Bfco+CfH2+DfCH3OH）3
여기서
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γ = fcof2H2-fCH3OH/Keq / （A+Bfco+CfH2+DfCH3OH）3
여기서
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We came up with a system of catalysts that can be useful in manufacturing methanol and higher alcohols from carbon monoxide and hydrogen at low temperature and pressure. These were prepared by adding alkaline potassium oxide to a mixture of oxides of copper, cobalt and chrome. The BET measurements of the catalysts gave 16.5㎡/g for surface area and the X-ray diffraction data indicated the presence of partly crystalline cupric oxide and cobalt chromite mixture.
The activity was relatively high for the formation of methanol and, at temperatures higher than 300 ℃, C2, C3 and C4 alcohols were also produced. The reaction was closely described by the Langmuir-Hinshelwood mechanism, in which the rate determining step was assumed to be the trimolecular surface reaction. Thus we could write the rate of reaction at 280 ℃ as, （fcof2H2-fCH3OH/Keq）/(A+Bfco+CfH2+DfCH3OH)3, where f denotes the fugacity of each gas, Keq the equilibrium constant and A,B,C,D empirical constants.
The activity was relatively high for the formation of methanol and, at temperatures higher than 300 ℃, C2, C3 and C4 alcohols were also produced. The reaction was closely described by the Langmuir-Hinshelwood mechanism, in which the rate determining step was assumed to be the trimolecular surface reaction. Thus we could write the rate of reaction at 280 ℃ as, （fcof2H2-fCH3OH/Keq）/(A+Bfco+CfH2+DfCH3OH)3, where f denotes the fugacity of each gas, Keq the equilibrium constant and A,B,C,D empirical constants.