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实验采用浸渍法制备分子筛负载型催化剂,微波场中利用吸波材料碳化硅和催化剂催化氧化甲苯废气.考察了碳化硅与分子筛负载铜-钒催化剂混合比及混合方式等条件变化对甲苯降解的影响,并通过电镜扫描、比表面积测试和X射线衍射分析等手段对催化剂进行了表征.研究表明,在固定床反应器底部装填质量比20%的碳化硅时,反应器兼有蓄热性能和低温催化氧化的优点,可有效提高微波能的利用和甲苯的催化氧化效率;微波功率75 W和47 W作用下,分子筛负载铜-钒催化剂和负载铜-钒-铈催化剂对甲苯的完全燃烧温度分别为325℃和160℃.表征发现,稀土元素铈的掺杂提高了活性组分在催化剂表面的分散度,催化剂的微孔结构保证了其对甲苯的高吸附性能,而非晶相型铜、钒氧化物的存在则提高了催化剂的催化活性.
In the experiment, molecular sieve supported catalyst was prepared by impregnation method, and microwave was used to catalyze the oxidation of toluene gas by microwave absorbing silicon carbide and catalyst. The effects of mixing ratio of silicon carbide and molecular sieve supported copper-vanadium catalyst on the degradation of toluene were investigated , And the catalysts were characterized by scanning electron microscopy, surface area measurement and X-ray diffraction analysis.The results show that when the bottom of the fixed bed reactor is filled with 20% silicon carbide, the reactor has both thermal storage performance and low temperature Catalytic oxidation can effectively improve the utilization of microwave energy and the catalytic oxidation efficiency of toluene. Under the microwave power of 75 W and 47 W, the complete combustion temperatures of toluene on zeolite supported copper-vanadium catalyst and supported copper-vanadium-cerium catalyst are respectively Was 325 ℃ and 160 ℃ .It was found that the doping of rare earth element cerium increased the dispersion of the active component on the catalyst surface and the microporous structure of the catalyst guaranteed its high adsorption capacity for toluene while the amorphous phase of copper, The presence of vanadium oxide increases the catalytic activity of the catalyst.