An in situ spatially resolved analytical technique to simultaneously probe gas phase reactions and temperature within the packed bed of a plug flow reactor.
An in situ spatially resolved analytical technique to simultaneously probe gas phase reactions and temperature within the packed bed of a plug flow reactor.
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一种原位空间分辨分析技术，可同时探测活塞流反应器填充床内的气相反应和温度。
DOI：
10.1039/c3an00250k
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Touitou J
中科院分区：
文献类型：
--
作者：
Touitou J
本文报道了一种全自动、计算机控制的分析方法的详细描述和验证，该方法用于空间探测填充床系统中的气体成分和热特性。作为一个例子，我们已经研究了在粉末状氧化物负载的金属催化剂床内的非均相催化气相反应。公开了气体采样和温度记录系统的设计。一个固定的毛细管与孔钻在其壁和一个可移动的反应器与质谱仪耦合用于使采样和分析。该方法通过使用实际上可以使用的热电偶和毛细管的最小组合来限制探针对反应器的侵入。80 μ m（O.D.）热电偶插入250 μ m（O.D.）毛细血管热电偶与采样孔对齐，以使气体成分和温度分布能够在等效的空间分辨位置同时测量。这种分析技术已被验证，通过研究CO氧化超过1%的Pt/Al2O3催化剂和空间分辨率的化学物种的浓度和温度作为催化剂床内的轴向位置的函数的分布报告。
This paper reports the detailed description and validation of a fully automated, computer controlled analytical method to spatially probe the gas composition and thermal characteristics in packed bed systems. As an exemplar, we have examined a heterogeneously catalysed gas phase reaction within the bed of a powdered oxide supported metal catalyst. The design of the gas sampling and the temperature recording systems are disclosed. A stationary capillary with holes drilled in its wall and a moveable reactor coupled with a mass spectrometer are used to enable sampling and analysis. This method has been designed to limit the invasiveness of the probe on the reactor by using the smallest combination of thermocouple and capillary which can be employed practically. An 80 μm (O.D.) thermocouple has been inserted in a 250 μm (O.D.) capillary. The thermocouple is aligned with the sampling holes to enable both the gas composition and temperature profiles to be simultaneously measured at equivalent spatially resolved positions. This analysis technique has been validated by studying CO oxidation over a 1% Pt/Al2O3 catalyst and the spatial resolution profiles of chemical species concentrations and temperature as a function of the axial position within the catalyst bed are reported.
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