过去人们总认为不可逆化学反应是瞬时完成的瞬时反应,或者是反应产物随着时间稳定增加的稳态反应,但是近20年来发现在不可逆化学反应中,生成物的转化率随着时间或空间发生周期性的变化,转化率由低而高,再由高而低,如此周而复始循环不息地变化着,化学反应过程中存在着振荡现象。例如,在气体流动的开敞体系中,一氧化碳经铂箔的催化氧化,生成二氧化碳,人们观察到在某种情况下一氧化碳变为二氧化碳的转化率,由50%逐渐增加到90%后,又逐 The past, people always think that the irreversible chemical reaction is an instantaneous reaction completed instantaneously, or the reaction product steady steady reaction over time, but in the past 20 years found that the irreversible chemical reaction, the conversion of the product with time or space Periodic changes, the conversion rate from low to high, and then from high to low, so the cycle of change constantly changing, there is oscillation in the chemical reaction process. For example, in an open system of gas flow, carbon monoxide is catalytically oxidized by platinum foil to generate carbon dioxide, and one observes that in some cases the conversion of carbon monoxide to carbon dioxide is gradually increased from 50% to 90%