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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 adsorbent loaded with CoOX / CeO2 binary oxide was prepared by impregnation and incineration under inert gas using wooden activated carbon as raw material, and the adsorption performance of this kind of material on low concentration NOX at room temperature was studied. The particle morphology, thermal stability, crystal structure and specific surface area of the samples were characterized by scanning electron microscopy (SEM), thermogravimetry, X-ray diffraction (XRD) and low temperature nitrogen adsorption BET specific surface area method. The results showed that 0.10mmol-AC prepared at 0.10mmol / g CoOX / CeO2 had the best adsorption capacity for NOX at low concentration (7.04mg / m3) at room temperature (28 ℃), and the BET specific surface area Higher, better thermal stability and maximum adsorption capacity for NOX. When the loading of CoOX / CeO2 is too large, the BET specific surface area of the sample decreases overall, and the surface of the activated carbon burns, which leads to the decrease of NOX adsorption capacity. According to SEM, XRD, TG, BET specific surface area analysis results show that the activated carbon sample is likely to be the first of NO catalytic oxidation, and then the NO2 generated by adsorption and fixation.