论文部分内容阅读
采用调节前驱体溶液pH值的方法制备了用于低温NH3-SCR的V2O5-WO3/Ti O2催化剂。通过XPS、Raman光谱、H2-TPR、NH3-TPD、NH3-DRIFT、XRD及物理吸附等手段对催化剂进行了表征分析,并对其脱硝催化活性进行了测试。结果表明,前驱体溶液酸性的增强能够提高催化剂表面聚合态钒物种和V4+(3+)/V5+的比值以及表面酸性,增加活性位数量、降低反应的活化能、提高其脱硝催化性能。因此,通过提高前驱体溶液的酸性,有助于制备出脱硝活性较好的NH3-SCR催化剂。
The V2O5-WO3 / Ti O2 catalyst for low temperature NH3-SCR was prepared by adjusting the pH of the precursor solution. The catalysts were characterized by XPS, Raman spectroscopy, H2-TPR, NH3-TPD, NH3-DRIFT, XRD and physical adsorption. The catalytic activities of the catalysts were also tested. The results show that the acidity of precursor solution can increase the ratio of V4 + (3 +) / V5 + and surface acidity, increase the number of active sites, decrease the activation energy and improve the denitration catalytic performance of the catalyst. Therefore, by improving the acidity of the precursor solution, contribute to the preparation of better denitrification activity NH3-SCR catalyst.