钴铝水滑石对氮氧化物吸附性能研究  

Performance of Cobalt Aluminum Hydrotalcite on Nitrogen Oxides Adsorption

作　　者：邹吕熙 张学杨[2] 张茹 王昌松 郑文天 夏彤彤 葛林萍 

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214000 [2]徐州工程学院环境工程学院,江苏徐州221018 [3]山东建筑大学市政与环境工程学院,山东济南250000

出　　处：《环境科技》2017年第6期5-9,共5页Environmental Science and Technology

基　　金：江苏省高校自然科学研究面上项目(14KJB610010);徐州市科技计划项目(KC15SH017)

摘　　要：为实现NO_x的高效吸附,制备了钴铝水滑石吸附剂,并考察了Co,Al的质量比、吸附温度、空速、NO_x浓度等条件对钴铝水滑石吸附NO_x的影响;通过机械研磨法与等体积浸渍法分别制备了磷钨酸负载型钴铝水滑石吸附剂,研究了负载方式对NO_x的吸附量的影响;最后通过吸脱附再生实验评价了钴铝水滑石对NO_x的脱附与再生性能。实验结果表明:提高Co,Al的质量比与吸附温度均能提高对NO_x的吸附效率,而增大空速会降低对NO_x的吸附效率,提高NO_x浓度对吸附效率影响不明显,在NO_x质量比为29 000 mg/m^3时NO_x去除率仍高达87%;机械研磨法负载磷钨酸的钴铝水滑石对NO_x的吸附量最高可达176.4 mg/g,优于等体积浸渍法;通过升温脱附可实现水滑石吸附剂的再生,经4次吸脱附实验后对NO_x吸附效率仍高于85%,由此表明该吸附剂具有良好的重复使用性能。In order to reduce the NOx, adsorption technology with cobalt alumina hydrotalcite as adsorbent was explored. The influence of Co/Al mole ratio, adsorption temperature, gas velocity, NO, concentration and other conditions on NOx adsorption were determined. To improve the NOx adsorption capacity, adsorbent of phosphotungsten -loaded cobalt alumina hydrotalcite was prepared by two different methods of mechanical milling and impregnation. Then, the performance of loaded adsorbent on NOx adsorption capacity was investigated. Finally, the NO~ desorption and regeneration performance of cobalt aluminum hydrotalcite was evaluated by adsorption and desorption experiments. The results showed that increase Co/A1 molar ratio, increase adsorption temperature, decrease gas velocity would improve the NO, adsorption efficiency significantly, while change the NOx concentration present slight influence on the adsorption efficiency, such as when increase the NOx concentration up to 29 000 mg/m^3, the adsorption efficiency was still as high as 87%. The adsorption capacity of NOx on loaded adsorbent prepared by mechanical milling was up to 176.4 mg/g, which was higher than that of loaded adsorbent prepared by impregnation. After 4 times adsorption- desorption recycle experiments, the NOx adsorption efficiency on cobalt alumina hydrotalcite was still higher than 85%, which demonstrated the cobalt alumina hydrotalcite was qualified to be NOx adsorbent.

关 键 词：氮氧化物 吸附 吸附剂 水滑石 

分 类 号：X5[环境科学与工程—环境工程]