MnOx-SnO2/TiO2型催化剂低温NH3选择性催化还原NO

摘要

采用分段负载的方式制备了MnOx-SnO2/TiO2型催化剂，并将其用于NH3选择性催化还原NO中，在280～600℃温度区间对该催化剂的脱硝活性进行了测试，同时也考察了催化剂的抗硫耐水性能。实验结果表明，该催化剂在130～250℃温度范围内NO的转化率接近100%，并且表现出较好的抗硫耐水性能。氮吸附-脱附、XRD和NH3-TPD等表征结果表明，较大的比表面积、无定形态的Mn、较强的酸性位以及Mn、Sn、Ti之间的强相互作用是该催化剂活性较高的主要原因。%MnOx-SnO2/TiO2 catalyst was prepared in two steps,and was studied for the selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen. Its activity for the SCR of NO was tested in the temperature range of 60~280 ℃,and its H2O/SO2 durability were also investigated. The experimental results showed that the catalyst yielded nearly 100%NO conversion at 130~250 ℃. This catalyst showed excellent SCR activity and high H2O/SO2 durability. The characterization results of N2 adsorption-desorption,XRD,and NH3-TPD indicated that the higher surface area,amorphous Mn,the stronger acid sites,and the strong interaction between Mn,Sn,and Ti were responsible for the high catalytic activity.