中文摘要：

通过工业上的浸渍方法,制备了应用于燃煤电厂脱硝的不同配方的钒钼基脱硝催化剂,对已有活性配方进行了优化。利用XRD,N2-TPD,H2-TPR等技术对催化剂的物理性能、物相分析及氧化还原性进行了表征,解释了催化剂的构效关系。氮氧化物脱除率效果显示,在NO及NH3浓度为500μL/L,O2体积分数为5%,烟气空速达到60 000 h-1的条件下,催化剂达到了在200~400℃范围内脱硝效率在90%以上的效果,N2选择性在250℃以下高于60%,满足了电厂低负荷运行的需要。催化剂比表面积为59.86 m2/g。试验表明工业脱硝钒钼钛基催化剂高钒含量的最佳配方（质量百分比）为3%V-6%Mo-Ti O2,低钒含量活性最佳配方为1%V-7.5%Mo-Ti O2。氢气程序控温还原表征,钒含量及钼含量的提高明显增强了催化剂的氧化还原性,钼的出现提高了钒物种在催化剂表面的分散性,同时提供了更多氧化还原位点,从而导致了低温效果提高的结果。

英文摘要：

In order to enhance the deNOs catalyst efficiency used in the power plant, it used a traditional impregnation method to prepare a set of V -Mo -TiO2 catalyst samples. The NO performance, N2 selectivity and applicability were tested. N2 - TPD, XRD were used to characterize the catalyst structural and textural properties. H2 -TPR was used to evaluate the redox ability. A stimulated flue gas concentration was applied in the activity test. As a result, the best catalyst had a 90% above NO performance in the temperature range of 200 -400℃, the N2 selectivity was above 60% under 350 ℃. NO and NH3 concentration of 500 μL/L,.5 vol% 02 and the GHSV of 60000 h^ -1 was the simulated flue gas condition. The best performance catalyst with high V content was 3%V - 6% Me - TiO2. The best performance catalyst with low V content was 1% V - 7.5 % Mo - TiO2. Characterizations showed that the existence of MoO3 enhanced the dispersion of vanadium species on the surface and provided excess active redox sites, thus promoted the SCR performance at low temperature.