光催化氧化脱除高浓度氮氧化物的实验研究

利用自制负载型纳米二氧化钛光催化剂, 对NO光催化氧化诸实验条件进行了研究. 实验结果表明, 催化剂、氧气、湿度、NO浓度等是影响NO光催化氧化的主要因素, 在最佳实验条件下, NO光催化氧化降解率较高. 同时利用扫描电镜(SEM)、透射电镜(TEM)和X射线衍射图谱(XRD)分析光催化剂的微观性质; 利用化学分析方法分析反应产物的淋洗液和尾气吸收液的成分, 发现硝酸根的含量占优势, 根据此结果, 对NO光催化氧化机理进行了初步推断.

Removal of High Concentration NO through Photocatalytic Oxidation

The supported nano-TiO2 photocatalyst was prepared in laboratory, and the experimental conditions of photocatalytic oxidation for NO were studied by using a self-designed platform. Experimental results showed that the TiO2 photocatalyst, oxygen concentration, humidity and NO initial concentration were the main factors to the photocatalytic oxidiation of NO. Under the optimum experimental conditions, the higher removal efficiency for NO was obtained. The micro-properties of TiO2 photocatalyst were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffractometry. The leaching liquid and the absorption liquid of the tail gas were analyzed by chemical analysis methods, and the results indicated that the nitrate ion had a higher proportion in the liquid. According to above experimental results, the mechanism of NO photocatalytic oxidation was deduced initially.