【摘要】：采用浸漬法負載Cu,Mn及Cu-Mn雙金屬,制備以菱沸石分子篩SAPO-34為載體的低溫、廉價、高效的負載型選擇性催化還原(SCR)脫硝催化劑.考察了不同活性組分、負載量及煅燒溫度對氨選擇性催化還原(NH_3-SCR)催化劑活性的影響,并通過BET,XRD,NH_3-TPD,TEM,XPS等多種表征手段對催化劑進行分析.活性測試結果表明,Cu-Mn雙金屬共同負載的催化劑活性明顯優(yōu)于Cu或Mn單金屬負載的催化劑活性,當Cu,Mn的負載量分別為2%和6%,煅燒溫度為450℃時,催化劑的活性最佳,在溫度為180~330℃之間脫硝效率均能達到90%以上.分析結果表明,Cu-Mn雙金屬共同負載與單獨負載Cu或Mn相比,能夠減弱活性組分與分子篩載體的作用,在催化劑表面促進活性組分分散得更加均勻,同時Cu的引入增加了高價態(tài)Mn~(4+)和Mn~(3+)的比例,有利于提高催化劑的活性,引入Mn可適當調節(jié)Cu~(2+)與Cu~+的比例,有利于拓寬催化劑的活性溫度窗口.
[Abstract]:A low temperature, cheap and efficient supported selective catalytic reduction catalyst for (SCR) denitrification was prepared by impregnation of Cu,Mn and Cu-Mn bimetallic catalysts supported on SAPO-34 of siderite molecular sieves. The catalyst was characterized by low temperature, low cost and high efficiency. The effects of different active components, loading amount and calcination temperature on the catalytic activity of ammonia selective catalytic reduction (NH_3-SCR) catalysts were investigated. The catalysts were characterized by BET,XRD,NH_3-TPD,TEM,XPS and other characterization methods. The results of activity test showed that the activity of Cu-Mn bimetallic co-supported catalyst was better than that of Cu or Mn single metal supported catalyst. When the loading amount of Cu,Mn was 2% and 6%, the calcination temperature was 450 鈩，

本文編號：2459643