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实验研究了 C_3H_6在 Pt/γ-Al_2O_3上氧化的非稳态现象。考察了反应参数变化对体系稳定性的影响。特别注重检测了变参数过程中动力学行为的演变。通过对比催化剂表面的温度振荡和产物中 CO_2的浓度振荡观察到各种复杂的非稳态过程,加深了对产生化学振荡的机理认识。并提出了简化的7步机理模型来解释振荡行为。在这一机理中,通过 Pt 相的氧化还原循环来说明催化剂活性的循环导致了振荡态的出现。
The oxidation of C_3H_6 on Pt / γ-Al_2O_3 was studied experimentally. The effects of reaction parameters on the stability of the system were investigated. Special attention has been paid to detecting the evolution of kinetic behavior during variable parameters. By comparing the temperature oscillation of the catalyst surface with the concentration of CO 2 in the product, various complex unsteady processes were observed and the mechanism of chemical oscillation was deepened. A simplified 7-step mechanism model is proposed to explain the oscillation behavior. In this mechanism, the cycling of catalyst activity through the redox cycle of the Pt phase results in the appearance of an oscillatory state.