摘要
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。
Unsteady state phenomena in th oxidation reaction of propylene on Pt/γ-Al_2O_3 were studied experimentally.The effects of the variations in reaction parameters on the system stability were investigated.The observation of special importance was the evolution of dynamic behavior of the parameter variation.Various complex unsteady states were observed by the comparison of the catalyst surface temperature oscillations with the CO_2 concentration oscillations in products.The mechanism for the appearance of chemical oscillation was recognized further,and a simplified 7 step reaction mechanism model was suggested to interpret the oscillation behaviour.In this mechanism, it was considered that the occurrence of oscillation results from the cyclic variation of catalyst activity because of the oxidation-reduction cycle of Pt phase.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1992年第2期136-141,共6页
Chemical Reaction Engineering and Technology
关键词
稳定性
铂
丙烯
催化
氧化
振荡
Propylene
Catalytic oxidation
Kinetics
Oscillation
Stability
Reaction mechanism
