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建立了一套具有一定特点的脉冲气固色谱装置。可在接近反应条件下进行实验。(1)利用吸附平衡数据,计算了 CO 及 O_2在载体γ-Al_2O_3上的吸附等温线、微分吸附热及吸附熵变,并分析了随温度变化吸附性能转变的规律。(2)利用不可逆吸附和热脱数据,研究了附载在γ-Al_2O_3上稀土钙钛矿型催化剂的 CO 和 O_2的吸附性能,观察到 CO 氧化的反应活性和 CO 不可逆吸附之间有一定关联;CO 从催化剂表面热脱产物为 CO_2;并发现在表面“吸饱”CO 后,对 O_2没有不可逆吸附。
Established a set of pulse gas chromatography with certain characteristics of the device. Experiments can be performed near the reaction conditions. (1) The adsorption isotherms, differential adsorption heats and adsorption entropies of CO and O_2 on the carrier γ-Al_2O_3 were calculated by using adsorption equilibrium data. The change of adsorption properties with temperature was also analyzed. (2) The irreversible adsorption and thermal desorption data were used to study the adsorption properties of CO and O_2 on rare earth perovskite catalysts supported on γ-Al_2O_3. It is observed that there is a certain relationship between CO oxidation reaction and CO irreversible adsorption. CO was thermally removed from the surface of the catalyst by CO 2. It was found that there was no irreversible adsorption of O 2 on the surface after the CO was adsorbed on the surface.