摘要
以木质活性炭为原料,通过浸渍和惰性气体下灼烧的方法制备了负载有CoOX/CeO2二元氧化物的活性炭吸附材料,并研究了该类材料对室温下低浓度NOX的吸附性能。通过扫描电子显微镜(SEM)、热重、X射线衍射(XRD)分析和低温氮吸附BET比表面积方法表征了样品的颗粒形貌、热稳定性、晶体结构和比表面积。结果表明,CoOX/CeO2负载量为0.10mmol/g时制得的0.10mmol-AC在室温(28℃左右)下对低质量浓度(7.04mg/m3)NOX的吸附效果最佳,其BET比表面积较高,热稳定性较好,对NOX的吸附容量最大;当CoOX/CeO2负载量过大时,样品的BET比表面积总体下降,活性炭表面发生烧损,导致对NOX的吸附能力反而下降;根据SEM、XRD、热重、BET比表面积等的分析结果可知,活性炭样品很可能首先对NO发生催化氧化,进而对产生的NO2进行了吸附固定。
The active carbon doped with CoOx/CeO2 binary oxide was prepared by the process of dipping and calcinations in inert gas. The performance of obtained CoOx/CeO2 doped active carbon for low concentrate NOx adsorption was investigated at room temperature. Scanning electron microscopy （SEM） ,thermogravimetry （TG） ,X-ray powder diffraction （XRD）,and low-temperature N2 adsorption （BET） methods were employed to investigate the par- ticle morphology,thermal stability, crystal structure and BET specific surface area of the active carbon samples. Re- suits showed that the active carbon with CoOx/CeO2 loading quantity of 0.10 mmol/g （0.10 mmol AC） achieved the best NOx （7.04 mg/m3） adsorption capacity under room temperature （28 ℃ ）. The 0.10 mmol-AC sample had relative high specific surface area,better thermal stability,so that it achieved the highest NOx adsorption capacity. The surface of active carbon would burn out under too much CoOx/CeO2 loading quantity,and the decreased specific surface area would decline its NOx adsorption capacity. According to the analysis of SEM, XRD, TG and BET, the mechanism of NOx adsorption on CoOx/CeO2 doped active carbon was obtained： NO was firstly catalyzed and oxidized by CoOx/CeO2 doped active carbon,and then the produced NO2 was adsorbed on the surface of active carbon sample.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2014年第7期1-4,共4页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.21107111)
中国科学院先导专项(B类)(No.XDB05000000)
中国科学院知识创新工程重要方向项目(No.KZCX2-EW-403)
