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  

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

作　　者：束韫[1] 张凡[1] 王凡[1] 王红梅[1] 王洪昌[1] SHU Yun ZHANG Fan WANG Fan WANG Hong-mei WANG Hong-chang(Research Center of Air Pollution Control Technology,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]中国环境科学研究院大气污染控制技术研究中心,北京100012

出　　处：《燃料化学学报》2017年第6期747-754,共8页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21507119);青海省科技支撑计划(2012-J-144)资助~~

摘　　要：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-O_2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CO_2选择性。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 NOx 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.

关 键 词：NO还原 生物质炭 选择性 催化剂 

分 类 号：X51[环境科学与工程—环境工程]