Oscillations in the reaction rate of nitric oxide reduction by ammonia over polycrystalline platinum foil catalysts
Oscillations in the reaction rate of nitric oxide reduction by ammonia over polycrystalline platinum foil catalysts
复制标题
多晶铂箔催化剂上氨还原一氧化氮反应速率的波动
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
G. Somorjai
中科院分区：
文献类型：
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作者：
T. Katona;G. Somorjai
在大气压、反应物分压为133-600 Pa（1-4.5 Torr）、温度为603-673 K的条件下，NO + NH{sub 3}反应得到了自持振荡。研究了反应参数、温度、分压和反应气速对反应的影响。振荡的起始温度（603 K）略微依赖于进料气体中的一氧化氮的分压。在此温度附近，振荡是不受控制的（混沌），而增加温度导致反应速率的周期性振荡。振荡现象进行了研究，在等温和绝热模式。振荡，当由温度升高引发时，仅在诱导期之后启动，在诱导期期间，NO消耗和N{sub 2}形成的速率急剧增加，而不是N{sub 2}O形成的速率的缓慢增强。在间歇模式中，在高温和低温状态下发现的两个反应分支的产物分布与速率振荡幅度极端时发现的产物分布相似。参考文献36篇，13图。
Self-sustained oscillations were obtained in the No + NH{sub 3} reaction at atmospheric pressure with reactant partial pressures of 133-600 Pa (1-4.5 Torr), in the temperature range of 603-673 K. The effects of reaction parameters, temperature, partial pressure, and reactant gas velocity were studied. The onset temperature of the oscillations (603 K) was slightly dependent on the partial pressure of nitric oxide in the feed gas. Near this temperature the oscillations were uncontrolled (chaotic), while increasing the temperature resulted in periodic oscillations in the reaction rates. The oscillation phenomena were studied in both isothermic and adiabatic modes. The oscillations, when initiated by a temperature increase, start up only after an induction period during which the rates of NO consumption and N{sub 2} formation sharply increase as opposed to the slow enhancement of the rate of N{sub 2}O formation. The two reaction branches found at the high- and low-temperature regimes in the batch mode have product distributions which are similar to those found at the extremes of the amplitudes of rate oscillations. 36 refs., 13 figs.