Oscillatory behavior during CO oxidation over a Ni foil in a continuous-flow catalytic reactor has been discovered in the reaction mixture containing CO excess at atmospheric pressure in the temperature range of 500–630 °C. The oscillations are accompanied by propagation of the oxidation and reduction fronts which were recorded by a photo–video camera. Dark fronts of the oxidized state appear periodically in the upstream part of the catalyst and propagate to the downstream region in the direction of the gas flow. Reduction fronts move in the opposite direction. A mathematical model has been developed to simulate the oscillatory dynamics. The developed model simulates experimental data almost quantitatively. The origin of oscillations is connected with periodic oxidation and reduction of the nickel surface. It is shown that a precursor-mediated adsorption of CO on Ni surface is required to simulate the oscillations under reducing conditions.

在连续流动的催化反应器中，在镍箔上进行的CO氧化过程中，在500-630°C的大气压下，含有过量CO的反应混合物中发现了振荡行为。振荡伴随着氧化和还原前沿的传播，这是由摄象机记录下来的。氧化态的暗锋周期性地出现在催化剂的上游部分，并在气流方向上传播到下游区域。还原前沿向相反方向移动。已经开发了数学模型来模拟振荡动力学。开发的模型几乎定量地模拟了实验数据。振荡的起源与镍表面的周期性氧化和还原有关。