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利用溶液浸渍法制备了一种氯化铜改性的选择性催化还原(SCR)催化剂(Cu Cl2/SCR)。用X射线衍射(XRD)和X射线荧光光谱分析(XRF)等对Cu Cl2/SCR催化剂的结构进行了表征,在自制的催化剂活性实验台上,用模拟烟气对催化剂Hg0的催化氧化性能进行了研究。结果表明:催化剂中的Cu Cl2在高温(HCl+O2)气氛中能“可逆”释放活性氯;Cu Cl2的引入显著提高了催化剂在低氯烟气(HCl浓度在0~81.5 mg/m3)中对Hg0的催化氧化效率;Hg0的氧化率随烟气中HCl浓度和催化剂中Cu Cl2负载量的增加而增加;烟气中的NH3和SO2能阻止Hg0在催化剂表面的吸附,导致Cu Cl2/SCR催化剂在SCR条件下对Hg0的催化氧化效率较纯氧化条件有所降低,但Cu Cl2/SCR仍保持了较高的Hg0催化氧化效率(可高达98%);Cu Cl2/SCR催化氧化Hg0的机制为Mars-Maessen机制。Cu Cl2/SCR兼具较高的脱硝性能和Hg0氧化性,可用于低氯燃煤烟气同时脱硝脱汞。
A copper chloride modified Selective Catalytic Reduction (SCR) catalyst (Cu Cl2 / SCR) was prepared by solution impregnation method. The structure of CuCl2 / SCR catalyst was characterized by X-ray diffraction (XRD) and X-ray fluorescence spectroscopy (XRF). The catalytic oxidation performance of catalyst Hg0 was simulated by simulated flue gas on a self- Study. The results show that CuCl2 can release “active” chlorine in the atmosphere of high temperature (HCl + O2). The introduction of CuCl2 significantly improves the catalytic activity of the catalyst in the low-chloride flue gas (HCl concentration range from 0 to 81.5 mg / m3 ) Oxidation efficiency of Hg0; the oxidation rate of Hg0 increases with the HCl concentration in the flue gas and the increase of Cu Cl2 loading in the catalyst; NH3 and SO2 in the flue gas can prevent the adsorption of Hg0 on the catalyst surface, resulting in the formation of CuCl2 / SCR catalyst has a lower catalytic oxidation efficiency for Hg0 than that for pure oxidation under SCR conditions, but Cu Cl2 / SCR retains higher Hg0 catalytic efficiency (up to 98%); Cu Cl2 / SCR catalyzes the oxidation of Hg0 The mechanism is the Mars-Maessen mechanism. Cu Cl2 / SCR has high denitrification performance and Hg0 oxidation, which can be used for the simultaneous denitration and mercury removal of low-chlorine coal-fired flue gas.