Analysis of a Novel Three-Phase Catalytic Reactor

陶瓷蜂窝单体最初是作为汽车催化转化器的催化剂支架而开发的。整体催化剂支架提供了一种用固体催化剂接触气体和液体的方法。由于其独特的几何结构，这种催化剂支撑具有较低的压降。由于催化剂的高表面积和低传质阻力，可以获得高反应速率，这可以在单体的通道内保持段塞流时实现。这种催化剂的正确使用要求气体和液体在单体的开孔中均匀分布。本研究将涉及一种新型单片反应器的建造和运行，该反应器通过在同一容器内形成两相泡沫来产生均匀的气液进料。泡沫是在段塞流中引入可控体积气体并进入整体通道的载体。该反应器将对苯酚在铜氧化物催化剂上的水相氧化进行评估，并将结果与泥浆反应器报告的数据进行比较。流动可视化实验将用于确定获得所需的单体内段塞流所需的流体动力学参数，并了解控制泡沫特性的方法。本文将建立一个基于方形通道内流体力学的反应器模型，该模型具有最小的可调参数。

Ceramic honeycomb monoliths were initially developed as catalyst supports for use in automotive catalytic converters. Monolithic catalyst support provides a means of contacting a gas and a liquid with a solid catalyst. This catalyst support delivers low pressure drop because of its unique geometry. High reaction rates may be obtained because of the high surface area of the catalyst and the low mass transfer resistance which can be realized when slug flow is maintained within the channels of the monolith. The proper use of such a catalyst requires uniform distribution of gas and liquid in the open cells of the monolith. This research will involve the construction and operation of a novel monolithic reactor in which a uniform gas-liquid feed is produced through the formation of a two-phase froth within the same vessel. The froth is a vehicle for the introduction of controlled volumes of gas and into the channels of the monolith in slug flow. The reactor will be evaluated for the aqueous phase oxidation of phenol over copper oxide catalyst and the results compared with data reported from a slurry reactor. Flow visualization experiments will be used to determine the hydrodynamic parameters necessary to obtain the desired slug flow within the monolith and understand the means by which the froth characteristics may be controlled. A reactor model based upon the hydrodynamics within square channels of the monolith will be developed, a model with a minimum of adjustable parameters.