以C2H4和C2HCl3为模型有机污染物，考察了不同反应条件下水蒸气对微波催化反应性能的影响.结果表明，水蒸气的存在是影响微波光催化反应性能的重要因素.由于微波对物质的极化作用不同，在加水的微波光催化反应过程中微波能量主要被水吸收，微波场对水的脱附有利于提高加水条件下C2H4微波光催化氧化活性，但不利于需要水的C2HCl3氧化反应的进行.
It is known that the competitive a dsorption of water vapor ontophotocatalyst causes a negative effect on gas-solid photocatalytic reaction. In this paper, the effect of water vapor on the micr owave-assisted photocatalytic oxidation of C2H4 and C2HCl3, with which as model organic pollutants, was examined under different reaction conditions. The results showed that H2O was an imp ortant factor to the photocatalytic oxidation. Because polarization of diff erent substances is quite different in microwave field, the energy of microwave was mostly absorbed by H2O for the photocatalytic reaction with water vapor. The improvement of C2H4 photocatalytic reactivity was attributed to desorptio n of water vapor from the catalyst surface in microwave field. However, the result of C2HCl3 oxidation was opposite, where H2O was required to complete the reaction.
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