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通过对比Mn Ox/AC、AC、无催化剂对甲苯的去除率和副产物的浓度,得知Mn Ox能大大提高甲苯去除率和降低副产物浓度。实验同时研究了负载量、煅烧温度和载体活性炭的活化对甲苯去除率的影响,实验表明:20%Mn Ox负载经过850℃活化的活性炭在350℃下煅烧得到的催化剂的活性最高。试验用BET、XRD和红外对催化剂进行了表征,研究发现,经过活化的催化剂比表面积高于没有活化的催化剂,随着负载量的增加比表面积降低,温度为250℃时硝酸锰主要分解为Mn2O3,温度为350℃时主要分解产物为Mn3O4,温度为450℃时主要为Mn O。红外表明反应后的催化剂表面氧化基团增加。
By comparing Mn Ox / AC, AC, catalyst-free toluene removal and byproduct concentrations, it was found that MnOx can greatly increase the toluene removal rate and reduce the by-product concentration. The effects of loading, calcination temperature and activation of activated carbon on toluene removal were also studied. The results show that the activity of activated carbon calcined at 2050% MnO at 850 ℃ is the highest. The catalysts were characterized by BET, XRD and IR. The results showed that the specific surface area of the activated catalyst was higher than that of the catalyst without activation, and the specific surface area decreased with the increase of the loading. When the temperature was 250 ℃, the MnO2 was mainly decomposed into Mn2O3 , The main decomposition product is Mn3O4 when the temperature is 350 ℃, and MnO is mainly when the temperature is 450 ℃. Infrared shows that the surface of the catalyst after the oxidation of the group increased.