甲酰氯生物炭催化剂同步脱硝除汞的研究

摘要

In order to obtain stable and high simultaneous NO and Hg0 removal catalyst at lower temperatures, formyl chloride biocarbon was synthesized by impregnation using tea-stalk as raw material and characterized by N2 physisorption-desorption, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). NO and Hg0 performance on formyl chloride biochar were investigated at 100-300 ℃ in fixed bed. The results indicate that temperature exhibites a significant effect on NO and Hg0 removal and heating can promote NO removal while Hg0 removal is inhibited above 200 ℃. At 200 ℃, NH3 exhibites an inhibitory effect on Hg0 removal, but almost no effect on NO removal, and O2 shows a significant promotion effect on NO and Hg0 removal. Formyl chloride biocarbon exhibites a good low temperature activity, achieving the optimum removal efficiency, such as Hg0 (93％) and NO (82.1％) at 200 ℃ and 300 ℃, respectively. Formyl chloride biocarbon can be used as a potential catalyst for simultaneous NO and Hg0 removal.%为了获得在较低温度下具有稳定的较高同步脱硝除汞效率的催化剂, 文中以茶梗为原料采用浸渍法合成了甲酰氯生物炭, 并进行了扫描电镜、X射线衍射、N2吸脱附、X射线光电子能谱分析技术表征.在固定床上100—300℃温度范围内对甲酰氯生物炭催化剂脱硝除汞性能进行了测试.研究结果表明:温度对于脱硝除汞效率有显著影响, 升温能促进NO的去除效率, 而除汞效率在200℃以上则受到抑制.在200℃, NH3对于汞的去除有抑制作用, 对NO去除几乎无影响, 而O2对于脱硝除汞均有较为显著的促进作用.酰氯生物炭催化剂表现出较好的低温活性, 在200℃除汞效率达到93％, 在300℃脱硝效率达到82.1％.甲酰氯生物炭可作为一种有潜力的同步脱硝除汞催化剂.