Mn-Ag/13X的焙烧温度对等离子体催化氧化吸附态甲苯的影响

采用等体积浸渍法制备一系列在不同温度下焙烧的Mn-Ag/13X分子筛催化剂，并用SEM、BET、XRD和XPS对催化剂进行表征。在低温等离子体反应器中，考察了不同焙烧温度制备的催化剂对甲苯的吸附和低温等离子体催化氧化甲苯的性能。研究结果表明，在对甲苯的吸附中，不同温度下焙烧的催化剂的吸附穿透时间依次为：600 ℃ > 500 ℃ > 400 ℃ > 300 ℃ > 700 ℃，600 ℃的Mn-Ag/13X催化剂比表面积最大，到达甲苯吸附穿透的时间最长；在低温等离子体催化氧化甲苯中，不同温度下焙烧的催化剂催化氧化所产生的COx浓度大小依次为：500 ℃ > 600 ℃ > 400 ℃ > 300 ℃，CO2选择性依次为：600 ℃ > 500 ℃ > 400 ℃ > 300 ℃，焙烧温度为500 ℃的Mn-Ag/13X催化剂的晶格氧多，产生的COx多，对甲苯的催化氧化活性高。

Effect of calcination temperature on Mn-Ag/13X for plasma catalytic oxidation of adsorbed toluene

A series of Mn-Ag/13X catalysts were prepared by an incipient-wetness impregnation method and calcinated at different temperatures.The catalysts were characterized by scanning electron microscopy (SEM), the Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS).The effects of different calcination temperatures on the Mn-Ag/13X catalysts on toluene adsorption and degradation were investigated in a nonthermal plasma reactor.The results show that the adsorption breakthrough times of catalysts calcinated at different temperatures ranked as follows:600℃ > 500℃ > 400℃ > 300℃ > 700℃;with the Mn-Ag/13X catalyst calcinated at 600℃ having the longest breakthrough time due to its highest BET surface area.During the catalytic oxidation of adsorbed toluene in the nonthermal plasma reactor, from the point of COx concentration, the catalysts calcinated at different temperatures ranked as follows:500℃ > 600℃ > 400℃ > 300℃ and from the point of CO2 selectivity, ranked as follows:600℃ > 500℃ > 400℃ > 300℃.The best calcination temperature for the catalystic oxidation of adsorbed toluene was 500℃, considering it had the highest COx due to its high amount of lattice oxygen.