富氧条件下生物质基活性炭负载钾催化剂高选择性还原氮氧化物

研究了富氧环境中生物质基活性炭负载钾催化剂选择性还原氮氧化物的性能。结果表明，与煤基（褐煤）活性炭负载钾催化剂相比，生物质基（木屑）活性炭负载钾催化剂表现出高选择性还原NO能力，在2 h恒温稳态实验过程中能够保持80%的NO还原效率，而C-O₂反应活性仅为18%。X射线衍射、比表面积、X射线光电子能谱以及程序升温脱附实验表征结果显示，生物质基活性炭负载钾催化剂优异的选择性还原NO性能应归因于炭表面钾物种的高度分散性，这与催化剂的高比表面积以及大量的表面氧基团有关。另外，生物质基炭材料还原NO反应产物中具有较高的CO₂选择性。

Biomass-derived activated carbon supported potassium catalyst for reduction of NOx in excess oxygen with higher selectivity

The selective reduction of NO in an oxygen-rich environment with biomass-derived activated carbon supported potassium catalyst was investigated. The. results show that in comparison with coal (lignite) based activated carbon supported potassium catalyst, biomass (sawdust) based activated carbon supported potassium catalyst exhibits a high selectivity for the reduction of NO_x to N₂, keeping a high and stable activity with NO reduction of about 80% during 2 h-isothermal experiment as well as a relatively low activity with the oxygen-carbon reaction of 18%. XRD, BET, XPS and TPD results indicate that the excellent catalytic performance of the biomass-derived activated carbon supported potassium catalyst is associated with the highly dispersion of active potassium species, which might result from the high surface area and the large amount of surface oxygen groups. Furthermore, the selective emission of CO₂ with regard to CO is an additional benefit of using biomass-derived activated carbon as the support for NO reduction.