论文部分内容阅读
以活性炭为载体,采用等体积浸渍法制备了负载型磷钨酸催化剂,并将其应用于NH3-SCR法低温脱硝。研究了磷钨酸(HPW)负载量和焙烧温度对脱硝性能的影响,通过BET、XRD和FT-IR等方法对催化剂进行了表征和机理研究。研究结果表明,HPW与载体活性炭之间存在着键合作用,且其在活性炭上存在的物相状态与负载量有关;研究焙烧温度时发现,负载在活性炭上的HPW随着焙烧温度的升高而逐渐发生分解;在NH3-SCR法脱硝反应中,催化剂的焙烧温度和HPW负载量对催化剂的脱硝性能有很大影响,通过XRD和FT-IR表征发现,活性炭上HPW晶相的出现和HPW的分解均不利于反应的进行。实验得到炭基HPW制备的最佳焙烧温度为400℃,负载量为30%,用于NH3-SCR法脱硝在反应温度为200℃时,NO转化率可达80.8%。
Activated carbon as a carrier, an equal volume impregnation method was prepared supported phosphotungstic acid catalyst, and its application to NH3-SCR low-temperature denitration. The effect of HPW loading and calcination temperature on the denitrification performance was studied. The catalysts were characterized and characterized by means of BET, XRD and FT-IR. The results showed that there was a bond between HPW and support activated carbon, and the phase state existed on the activated carbon was related to the loading. When the calcination temperature was found, HPW supported on activated carbon increased with the increase of calcination temperature And gradually decomposed. In the denitration reaction of NH3-SCR, the calcination temperature and HPW loading of the catalyst greatly influenced the denitration performance of the catalyst. The XRD and FT-IR characterization showed that the appearance of HPW crystal phase on HPC and HPW The decomposition is not conducive to the reaction. The optimal calcination temperature of the HPW-based HPW was 400 ℃ and the loading was 30%. The results showed that the NO conversion reached 80.8% when the reaction temperature was 200 ℃.