介质阻挡—催化降解甲苯中催化剂的表征研究

Research on catalyst characterization in DBD-catalyst reaction for toluene removal

采用介质阻挡放电作为低温等离子体的产生方式,对在低温等离子环境中反应了一段时间后的4种催化剂进行了表征.通过与反应前的表征结果对比,可以看到,催化剂在低温等离子体环境中反应,表面的铝酸盐分解成为金属氧化物;反应后催化剂表面的颗粒变小,分散度提高;有一定的有机物被吸附或沉积在催化剂表面上;Mn氧化物催化剂在发泡镍载体上分散良好,比表面积最大,在电场中Mn的铝酸盐基本完全分解为氧化物,因此催化反应活性最高.

In this paper, dielectric barrier discharge is used as a method to produce non-thermal plasma, and four catalysts which reacted under plasma field for a long time are characterized. Contrasting the result before and after the reaction, it is found that in the plasma reaction, aluminate on the catalyst surface is decomposed to metal oxide. The granularity of the grain on the catalyst surface became smaller and the distribution became more uniform after discharge. Some organic compounds are deposited on the catalysts after plasma reaction. In addition, manganese oxide catalyst disperses better on the nickel foam support, the BET surface area is largest, and its aluminate ahnost all is decomposed to metal oxide. Therefore, its catalytic activity is best.