研究报告
杨全,秦彩虹,黄家玉,白文文,郑洋,郭孟柯.双载体催化剂协同DBD氧化吸附态乙酸乙酯[J].环境科学学报,2020,40(5):1650-1655
双载体催化剂协同DBD氧化吸附态乙酸乙酯
- Oxidation of adsorbed ethyl acetate by dielectric barrier discharge coupled with bi-support catalysts
- 基金项目:陕西省教育厅2019年度专向研究计划(No.19JK0479);中国博士后科学基金第61批面上项目(No.2017M613289XB)
- 杨全
- 1. 西安建筑科技大学环境与市政工程学院, 西安 710055;2. 西北水资源与环境生态教育部重点实验室, 西安 710055
- 秦彩虹
- 1. 西安建筑科技大学环境与市政工程学院, 西安 710055;2. 西北水资源与环境生态教育部重点实验室, 西安 710055
- 黄家玉
- 中国环境科学研究院大气污染控制技术研究中心, 北京 100012
- 白文文
- 西安建筑科技大学环境与市政工程学院, 西安 710055
- 郑洋
- 西安建筑科技大学环境与市政工程学院, 西安 710055
- 郭孟柯
- 西安建筑科技大学环境与市政工程学院, 西安 710055
- 摘要:以13X为载体,采用等体积浸渍法制备分别负载Mn、Mo和Fe 的金属氧化物的催化剂,并与载体γ-Al2O3混合作为介质阻挡放电(DBD)的填料降解吸附态乙酸乙酯.实验结果表明,Mn/13X的乙酸乙酯氧化降解效果优于Mo/13X和Fe/13X,放电120 min时,其矿化率可达61.5%,CO2选择性为98.2%,其副产物O3和N2O的排放浓度也最低.在Mn/13X中加入γ-Al2O3,当两者质量比例为1:1时,由于双载体间的协同作用,吸附态乙酸乙酯的矿化率可进一步提高至64.4%.最后,结合反应器出口气体中和催化剂表面的中间有机副产物,分析了吸附态乙酸乙酯在DBD中的降解机理.
- Abstract:Mn, Mo and Fe loaded catalysts were prepared by wet impregnation method with 13X as the carrier. Then they were mixed with γ-Al2O3 as the filler of dielectric barrier discharge (DBD) reactor for the degradation of adsorbed ethyl acetate. The experimental results showed that Mn/13X had better ethyl acetate oxidation performance than Mo/13X and Fe/13X. When discharging for 120 min, the mineralization rate of Mn/13X was 61.5% with CO2 selectivity of 98.2%. The emissions of byproduct O3 and N2O of Mn/13X were the lowest among the tested catalysts. When γ-Al2O3 was added into Mn/13X with the mass ratio of 1:1, the mineralization rate of ethyl acetate further increased to 64.4% due to the synergistic effect between carriers. Finally, the degradation mechanism of adsorbed ethyl acetate in DBD was analyzed basing on the intermediate organic by-products in the gas at the outlet of the reactor and on the surface of catalysts.