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本文用脉冲色谱技术和液氮冷阱分离技术研究了(Fe,Cr)_3O_4上 CO、CO_2的吸附和反应性能。本文还用色谱法测定了吸附热。在(Fe,Cr)_3O_4上 CO 的吸附热为44.4千焦/摩(70—160℃),改变样品中的含铬量对 CO 的吸附热影响不大。CO_2的吸附热在低温区(76—155℃)为38.3千焦/摩;高温区(292.5—380℃)为32.6千焦/摩,但对缺氧表面可高达73.2千焦/摩(349—412℃)。这表明(Fe,Cr)_3O_4的表面状态不同,对高温区 CO_2吸附热影响很大。
In this paper, the adsorption and reactivity of CO and CO_2 on (Fe, Cr) _3O_4 were studied by pulse chromatography and liquid nitrogen cold trap separation. In this paper, the adsorption heat was also measured by chromatography. The adsorption heat of CO on (Fe, Cr) _3O_4 is 44.4 kJ / mol (70-160 ℃). The change of chromium content in the sample has little effect on the CO adsorption heat. The CO 2 adsorption heat is 38.3 kJ / mol in the low temperature range (76-155 ° C) and 32.6 kJ / mol in the high temperature range (292.5-380 ° C), but can reach as high as 73.2 kJ / 412 ° C). This indicates that (Fe, Cr) _3O_4 has different surface states and has a great influence on the adsorption heat of CO_2 in high temperature.