Experimental evidence for an oxidation/reduction mechanism in rate oscillations of catalytic CO oxidation on Pt/SiO2
Experimental evidence for an oxidation/reduction mechanism in rate oscillations of catalytic CO oxidation on Pt/SiO2
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DOI：
10.1007/bf00806068
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发表时间：
1994-06
影响因子：
2.8
通讯作者：
N. Hartmann;R. Imbihl;W. Vogel
中科院分区：
文献类型：
--
作者：
N. Hartmann;R. Imbihl;W. Vogel
原位X射线衍射实验已经进行了催化CO氧化的速率振荡期间的负载型Pt催化剂，EuroPt-1。在大气压下以200 ml/min的流速进行的测量表明，反应速率的非等温振荡伴随着布拉格峰的周期性强度变化。的德拜函数分析记录在两个极端的振荡的光束剖面显示，铂催化剂进行周期性的氧化和还原速率振荡期间。因此，衍射实验被认为是第一个实验证明，最初由销售，特纳和枫树提出的氧化物模型来解释速率振荡的CO + O2反应在大气压下实际上是正确的。
In situ X-ray diffraction experiments have been conducted during rate oscillations of catalytic CO oxidation on a supported Pt catalyst, EuroPt-1. The measurements which were carried out at atmospheric pressure with flow rates of ∼ 200 ml/min showed that the non-isothermal oscillations in the reaction rate were accompanied by periodic intensity variations of a Bragg peak. A Debye function analysis of beam profiles recorded at the two extrema of the oscillations revealed that the Pt catalyst undergoes a periodic oxidation and reduction during rate oscillations. The diffraction experiments are therefore considered to be the first experimental proof that the oxide model proposed originally by Sales, Turner and Maple to explain rate oscillations in the CO + O2reaction at atmospheric pressure is in fact correct.