Adsorption and Photocatalytic Oxidation of Methanol-Benzene Binary Mixture in an Annular Fluidized Bed Photocatalytic Reactor

作者：Geng Qijin^*; Wang Qingming; Zhang Bin

来源：Industrial & Engineering Chemistry Research, 2012, 51(47): 15360-15373.

DOI：10.1021/ie302207p

Adsorption and photocatalytic degradation kinetics of a gaseous benzene-methanol binary mixture in an annular fluidized bed photocatalytic reactor (AFBPR) were investigated. On the basis of a series of adsorption and photocatalytic degradation :kinetic equations developed, the influences' Of molar ratios of benzene-methanol and relative humidity (RH), on adsorption efficiency, degradation efficiency, and half-life were explored. The results indicated that the molar ratio of benzene-methanol and RH has obviously influenced the adsorption/photocatalytic degradation and corresponding kinetic parameters. In the adsorption process, the coadsorption mechanism of methanol-benzene not only was related to competition adsorption but also involved penetrating the multi- or mono-water layer formed on the surface of Catalyst particles as well. On the basis of the photocatalytic degradation. kinetics of the benzene methanol binary component, a new mechanism occurred in the photocatalytic oxidation of the methanol benzene binary mixture due to competitive adsorption of them and some new radicals produced On the same photocatalyst surface was deduced. The special complex relationship between the photocatalytic degradation,efficiency and the molar ratio of benzene-methanol with various RH demonstrated that there was an obvious synergy effect between benzene, methanol, and water molecule in photocatalytic degradation processes. This investigation highlights the importance of controlling RH and molar ratio in binary mixture in order to obtain the desired synergy effect in PCO processes.

• 出版日期2012-11-28
• 单位潍坊学院