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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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scr脱硝催化剂对烟气中零价汞的氧化效率研究
, PP. 241-246
Keywords: scr,脱硝催化剂,烟气,零价汞,氧化效率
Abstract:
？采用模拟实验方法,在氧化气氛工况和scr(选择性催化还原法)工况下,对比研究新鲜的和运行40000h的scr催化剂对零价汞(hg0)的氧化效率,并结合n2吸/脱附、sem-eds、ft-ir、离子色谱法等手段对催化剂的组成及结构进行了表征。结果表明,在氧化气氛工况下(一定的hcl和o2浓度),40000h催化剂对零价汞的氧化效率比新鲜催化剂低5%~20%,但是,在scr工况(氧化气氛下加入nh3和no)下,氧化效率仅下降5%~10%。运行40000h催化剂出现表面颗粒的团聚现像,而且比表面积、活性物质v及v5+=o基团的含量均相对下降;然而,运行40000h催化剂的水溶性离子含量(特别是na+、k+、nh4+、so42-)要高于新鲜催化剂。这些因素都会影响催化剂表面活性位和内部孔道结构,从而影响到催化剂对于烟气中hg0的氧化效率。
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