Wang Wen, Chiang Li Wei, Ku Young
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei City, Taiwan.
J Hazard Mater. 2003 Jul 18;101(2):133-46. doi: 10.1016/s0304-3894(03)00169-9.
Photocatalytic decomposition of gaseous benzene at room temperature was studied with a fixed-bed annular reactor using titania as the photocatalyst. The effects of humidity, UV light intensity and benzene concentration on the conversion and mineralization of benzene were presented. Experimental results can be adequately described by using the Langmuir-Hinshelwood (L-H) kinetic model. The concentration distribution of benzene in the annular reactors of various dimensions can be described by combining the reactor design equation with L-H kinetics. Deactivation of catalyst was observed and attributed to the adsorption of reaction intermediates on TiO2 surface. The deactivated TiO2 catalyst could be photochemically regenerated by ozone-purging in the presence of humidity.
采用固定床环形反应器，以二氧化钛为光催化剂，研究了室温下气态苯的光催化分解。考察了湿度、紫外光强度和苯浓度对苯转化率和矿化率的影响。实验结果可用Langmuir-Hinshelwood（L-H）动力学模型进行充分描述。结合反应器设计方程和L-H动力学，可以描述不同尺寸环形反应器中苯的浓度分布。观察到催化剂失活，这归因于反应中间体在TiO2表面的吸附。失活的TiO2催化剂可在湿度存在下通过臭氧吹扫进行光化学再生。
