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一种改性选择性催化还原催化剂及其对零价汞的催化氧化性能

DOI: 10.13334/j.0258-8013.pcsee.2015.03.015, PP. 623-630

Keywords: 改性选择性催化还原(SCR)催化剂,氯化铜,制备,零价汞氧化,机制

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Abstract:

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(CuCl2/SCR)。用X射线衍射(XRD)和X射线荧光光谱分析(XRF)等对CuCl2/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CuCl2在高温(HCl?O2)气氛中能“可逆”释放活性氯;CuCl2的引入显著提高了催化剂在低氯烟气(HCl浓度在0~81.5mg/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CuCl2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CuCl2/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CuCl2/SCR仍保持了较高的Hg0催化氧化效率(可高达98%);CuCl2/SCR催化氧化Hg0的机制为Mars-Maessen机制。CuCl2/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。

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