Degradation of volatile organic compounds in the gas phase by heterogeneous photocatalysis with XXXX /ultraviolet light.

@entity1045 @entity7323 @entity58465 @entity14143 @entity273 @entity6701 @entity37125 @entity23940 @entity702
UNASSIGNED: This work presents an overview over heterogeneous photocatalysis performed in gas phase towards the degradation of @entity58465 , @entity1045 , @entity14143 , @entity37125 , @entity23940 and @entity7323 . The experimental set-up composed by a @entity702 plug flow reactor vessel contained a quartz tube with a 100 W UV lamp placed at center position from 1.7 cm to the quartz wall. A @entity6701 film was immobilized on the internal walls of the reactor and used as catalyst. All measurements were taken after reaching steady state condition and evaluated at the inlet and outlet of the system. Conversion rates were studied in a wide range of residence times yielding to a 90% or above conversion as from 20 seconds of residence time. During experiments the temperature of reactor's wall was monitored and remained between 52 and 62   C. Temperature influence over degradation rates was negligible once a control experiment performed at 15   C did not modify outgoing results. Humidity effect was also evaluated showing an ideal working range of 10 - 80% with abrupt conversion decay outside the range. By varying inlet concentration between 60 and 110 ppmv the VOC degradation curves remained unchanged. Loss over catalytic activity was only observed for @entity58465 after 30 minutes of reaction, the catalyst was reactivated with a solution of @entity273 and UV light followed by additional deposition of the catalytic layer. The kinetic study suggests a first order reaction rate. IMPLICATIONS: The study of effective and economically viable techniques on the treatment of volatile organic compounds (VOCs) has being highlighted as an important parameter on the environmental research. The heterogeneous photocatalysis in gas phase was proved to be an effective process for the degradation of the nonaromatic VOCs tested, yielding high conversion values for the optimized systems.
