铂催化剂上乙烯和一氧化碳同时氧化反应多定态特性的实验研究

对铂催化剂上乙烯和一氧化碳同时氧化反应多定态特性的实验研究结果表明：在实验条件下体系最多存在有两个稳定的定态，随乙烯和／或一氧化碳浓度的增加，系统的点火温度升高，熄火温度下降，存在多定态的操作参数区域增大；在较高的乙烯和／或一氧化碳浓度条件下，系统将出现自持，实验观测不到熄火现象。通过对体系多定态特性的分析可知，同时氧化反应体系的多定态特性并不等于两个单独氧化反应体系多定态特性的简单迭加，在两个反应之间，除了热量的相互作用外，还存在着动力学抑制作用。

STEADY STATE MULTIPLICITY OF SIMULTANEOUS OXIDATIONS OF ETHYLENE AND CARBON MONOXIDE ON PLATINUM FOIL

The multiple steady state features for the simultaneous oxidations of ethylene and carbon monoxide on platinum foil are investigated by experiments.The experimental results illustrate that the maximum number of the stable steady states is two for the specific system. With increasing the concentration of ethylene and ／or carbon monoxide,the ignition temperature increases,but the extinction temperature decreases,the region of operating arameters in which multiple steady states exist enlarges.When the concentration of carbon monoxide or ethylene is higher than some critical value,the reaction System will appear self-sustained,and extinction can not be observed during the experiments.From the analysis on the multiplicity features of the simultaneous oxidations,we know that the multiple steady state features of this system are different from separate ethylene oxidation or carbon monoxide oxidation on the same catalyst．From the multiplicity features of the simultaneous oxidation system the mechanism is found to be parallel reaction,but not consecutive reaction.In addition to thermal interaction,there exists kinetic inhibition between the two reactions.