A Combined Suspended Titania Reactor and Filtration System for Photocatalytic Oxidation of Airborne Volatile Organic Compounds

由于空气中VOC排放的环境和健康危害，联邦法规将要求改进VOC控制技术。利用紫外光照射的二氧化钛催化剂进行光催化氧化已显示出对多种有机物，特别是卤代化合物的破坏能力。许多实验室规模的反应堆设计已经过测试，并在一些应用中显示出前景，但其特点是光利用率相对较低，空气处理能力有限。建议的反应器设计结合了悬浮催化剂反应器和用于催化剂回收的陶瓷过滤系统，非常容易扩展到许多VOC应用中的高流速。该反应器的设计是一个简单的推流式反应器，其中悬浮的二氧化钛催化剂在VOC污染的空气中周期性地被照亮。悬浮的二氧化钛颗粒使用化学耐用、高效、可反冲的陶瓷过滤器进行过滤，这些过滤器具有非常高的堆积密度。由此产生的系统非常紧凑，可以将高活性的悬浮催化剂回收到光催化反应器中。

Due to the environmental and health-related hazards of airborne VOC emissions, Federal regulations will require improved VOC control technologies. Photocatalytic oxidation using UV illuminated titania catalysts has demonstrated the capability of destroying a wide range of organics, in particular halogenated compounds. Many bench scale reactor designs have been tested and show promise in some applications but are characterized by relatively poor light utilization and limited air treatment capacities. The proposed reactor design, which incorporates a suspended catalyst reactor combined with a ceramic filtration system for catalyst recycle, is very easily scaleable to high flow rates found in many VOC applications. The reactor design is a simple plug flow reactor in which suspended titania catalyst is periodically illuminated in the presence of VOC contaminated air. The suspended titania particulates are filtered using chemically durable, high efficiency, backpulsable ceramic filters which have a very high packing density. The resulting systems are very compact and allow the recycle of high activity suspended catalysts back to the photocatalytic reactor.