CuCe0.75Zr0.25Oy催化剂上CO自持燃烧实验研究

The Experiment Study on Self-sustained Combustion of CO over CuCe0.75Zr0.25Oy Catalyst

中文关键词: CuCe0.75Zr0.25Oy催化剂  CO  自持燃烧  温度场  热稳定性

英文关键词: CuCe0.75Zr0.25Oy catalyst  CO  self-sustained combustion  temperature field  thermal stability

中文摘要:

      针对转炉放散煤气传统的直燃排放造成严重的能源浪费和环境污染问题，采用溶胶凝胶法制备CuCe0.75Zr0.25Oy新型催化剂，研究了反应气浓度对CO自持催化燃烧的影响规律。结果表明，CO自持燃烧发生的临界条件为3%CO+3%O2/N2；CO与O2浓度的增大均促进了CO完全转化温度的提前，有利于CO自持燃烧反应的进行；随CO2浓度增大，导致CO完全转化所需炉温越来越高，不利于CO自持燃烧反应的进行。同时进行了CuCe0.75Zr0.25Oy催化剂的热稳定性实验研究，结果表明，10%CO+90%合成空气条件下，CuCe0.75Zr0.25Oy催化剂在100h内具有高热稳定性，催化剂活性基本保持不变，催化剂表面反应温度保持在310.0±3.0℃。

英文摘要:

      Direct combustion emissions of converter off-gas in steelmaking process create energy waste and environment pollution. The CuCe0.75Zr0.25Oy new catalyst is prepared by sol-gel method. The CO self-sustained combustion experiments show that the critical conditions of CO self-sustained combustion is 3%CO+3%O2/N2. The advance of CO conversion temperature is promoted with increasing of the concentration of CO and O2, which is benefit for the self-combustion reaction of CO. However, with rise of the concentration of CO2, the furnace temperature turn to be much higher to realize the complete conversion of CO, and it’s difficult for the self-combustion reaction of CO. The thermal stability test indicates that the CuCe0.75Zr0.25Oy catalyst remains high thermal stability for 100 h under the reaction gas (10%CO+90% air), its catalytic activity also remains unchanged, and the surface reaction temperature of the catalyst remains at 310.0±3.0℃.