负载铈-铜茶梗基生物炭联合脱硝除汞的性能研究

Performance study on simultaneous removal of nitrogen oxide and elemental mercury by CeO_2-CuO loaded Pu'er tea stem biochar

为了获得廉价易得的可以同时脱硝除汞的吸附催化剂,选取云南普洱茶废弃茶梗为碳源,采用等体积浸渍的方法制备了不同二氧化铈(CeO_2)-氧化铜(CuO)(CeO_2-CuO)浸渍配合比的茶梗基生物炭。并运用氮气(N_2)吸附脱附、扫描电子显微镜(SEM)、X射线衍射(XRD)对吸附催化剂进行了表征。在100~300℃范围内,固定床模拟烟气条件下研究了联合去除的效果。研究结果表明:CeO_2和CuO的浸渍量都为4%(wt,质量分数),制得的茶梗基生物炭,在300℃条件下,对一氧化氮(NO)的降解率达到82.3%,在100℃条件下,对单质汞(Hg0)的降解率高达93.0%。

Yunnan Pu＇er tea stem was chosen as carbon source,in order to getting inexpensive adsorption catalyst for simultaneous removal of nitrogen oxides and elemental mercury.Tea stem biochars with different impregnating ratio of cerium dioxide-copper oxide（CeO2-CuO）were prepared by incipient impregnation method.The adsorption catalyst was characterized using nitrogen（N2）adsorption-desorption,scanning electron microscopy（SEM）and X-ray diffraction（XRD）.The catalysts＇ performance of simultaneous removal was investigated in fixed-bed system with the condition of simulated flue gas in the temperature range of 100℃to 300℃.The results showed that when the impregnation ratio of CeO2 and CuO was 4 wt%（mass percentage）,respectively,the obtained tea stem biochar had a degradation rate of 82.3% for nitric oxide（NO）at 300℃,the degradation rate of elemental mercury（Hg0）was as high as 93.0% at 100℃.