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首页> 外文期刊>Comptes Rendus Chimie >Spatially resolved operando infrared analysis of a microstructured catalytic surface for CO oxidation over Pt based catalysts
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Spatially resolved operando infrared analysis of a microstructured catalytic surface for CO oxidation over Pt based catalysts

机译：Pt基催化剂上CO氧化微结构催化表面的空间分辨操作红外分析

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摘要

A new experimental reactor concept was developed for operando and spatially resolved DRIFTS surface analysis over a microstructured catalytic reactor. Both gas and surface adspecies concentration profiles can be established along the channels coated with catalyst.The oxidation of carbon monoxide was studied from 25 to 300 °C over a Pt/Ce02—A1203 catalyst. For these operating conditions nearly isothermal conditions were observed for the microstructured reactor, with a continuous increase in conversion along the microchannels. In contrast, an important thermal effect with characteristic light-off was obtained in the fixed bed reactor, underlining the unique behaviour of the microstructured system.Modelling of the CO conversion and surface adspecies concentration as a function of temperature along the channels was performed on the basis of a simple reaction mechanism. Kinetic parameters depending on the catalyst composition were obtained, in good agreement with literature data.
机译：开发了一种新的实验反应器概念，用于在微结构催化反应器上进行操作和空间分辨的DRIFTS表面分析。可以沿着涂有催化剂的通道建立气体和表面形态的浓度分布图。研究了在Pt / Ce02-A1203催化剂上，一氧化碳的氧化温度从25到300°C。对于这些操作条件，对于微结构化反应器观察到几乎等温条件，并且沿着微通道的转化率连续增加。相比之下，在固定床反应器中获得了具有特征性起燃的重要热效应，突显了微结构化系统的独特行为。对沿通道的CO转化率和表面态浓度随温度的函数进行了建模。一个简单的反应机制的基础。获得了取决于催化剂组成的动力学参数，与文献数据高度吻合。

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