改性炽热炭还原脱硝技术的研究
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摘要
针对炽热炭还原脱硝技术存在的反应温度高、炭消耗量大等问题,通过负载金属元素对活性炭进行改性,考察了不同元素(K、Ca、Fe、Co、Ni和Cu)对C-NO脱硝性能和反应选择性的影响。结果表明:反应条件对C-NO反应有着重要影响,高温有利于C-NO反应的进行,氧气的存在可提高低温条件下NO的还原率,但同时会增加活性炭的消耗;Co改性的活性炭,在低温下的NO还原率最高,且Co的最佳负载量为7%;在Co/AC的基础上,进一步K负载改性可以提高催化剂活性,而Ni和Ca改性则可以降低活性炭的消耗。
In order to solve the problems of high reaction temperature and high carbon consumption involved in the reduction denitrification technology by hot carbon,modification of activated carbon was achieved with several metals. Experiments were performed to investigate the effect of metals( K,Ca,Fe,Co,Ni and Cu) on the denitrification activity and selectivity. The results indicated that reaction conditions would significantly affect the C-NO reaction. high temperature facilitated the C-NO reaction. The presence of oxygen could improve the reduction ratio of NO under low-temperature conditions,but the oxygen also increased the carbon consumption.Activated carbon modified by Co exhibited the best low-temperature denitrification performance,and the optimal Co content was 7%. Based on Co/AC,the further modification with K could promote the denitrification activity,while modification with Ni and Ca would reduce the carbon consumption.
In order to solve the problems of high reaction temperature and high carbon consumption involved in the reduction denitrification technology by hot carbon,modification of activated carbon was achieved with several metals. Experiments were performed to investigate the effect of metals( K,Ca,Fe,Co,Ni and Cu) on the denitrification activity and selectivity. The results indicated that reaction conditions would significantly affect the C-NO reaction. high temperature facilitated the C-NO reaction. The presence of oxygen could improve the reduction ratio of NO under low-temperature conditions,but the oxygen also increased the carbon consumption.Activated carbon modified by Co exhibited the best low-temperature denitrification performance,and the optimal Co content was 7%. Based on Co/AC,the further modification with K could promote the denitrification activity,while modification with Ni and Ca would reduce the carbon consumption.
引文
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[3]张烨,缪明烽.SCR脱硝催化剂失活机理研究综述[J].电力科技与环保,2011,27(6):6-9.
[4]Duan J F,Shi W W,Xia Q B,et al.Characterization and regeneration of deactivated commercial SCR catalyst[J].Journal of Functional Materials,2012,43(16):2191-2195.
[5]Liang Z Y,Ma X Q,Linh,et a1.The energy consumption and environmental impacts of SCR technology in China[J].Applied Energy,2011,88(4):1120-1129.
[6]仇志超,陆强,王琦,等.铜基CH4-SCR脱硝催化剂的性能研究[J].电力科技与环保,2017,33(5):1-5.
[7]彦斌.炭还原法治理石油FCC催化剂再生烟气中氮氧化物的研究[D].湘潭:湘潭大学文,2012.
[8]祝社民,李伟峰,陈英文,等.烟气脱硝技术研究新进展[J].环境污染与防治,2005,27(9):699-703.
[9]曹小凯.活性炭及活性纤维负载金属氧化物催化去除NOx的研究[D].哈尔滨:哈尔滨工业大学,2008.
[10]Yamashitah,Tomita A,Yamadah,et a1.Influence of char surface chemistry on the reduction of nitric oxide with chars[J].Energy and Fuels,1993,7(1):85-89.
[11]Suzuki T,Kyotani T,Tomita A.Study on the carbon-nitric oxide reaction in the presence of oxygen[J].Industrial and Engineering Chemistry Research,2002,33(11):2840-2845.
[12]Yamashitah,Yamadah,Tomita A.Reaction of nitric oxide with metal-loaded carbon in the presence of oxygen[J].Applied Catalysis,1991,78(2):L1-L6.
[13]López D,Calo J.The NO-carbon reaction:?the influence of potassium and CO on reactivity and populations of oxygen surface complexes[J].Energy and Fuels,2007,21(4):1872-1877.
[14]Illán-Gómez M J,Brandán S,Linares-Solano A,et a1.NOxreduction by carbon supporting potassium-bimetallic catalysts[J].Applied Catalysis B:Environmental,2000,25(1):11-18.
[15]高志明,王新平,叶兴凯,等.活性炭酸处理对Cu O/AC催化剂上NO还原反应的影响[J].分子催化,1996,10(2):109-114.
[16]Feng B N,Lu G Z,Wang Y Q,et a1.Promoting role of potassium on the catalytic performance of copper oxide for the reduction of NO by activated carbon[J].Chinese Journal of Catalysis,2011,32(5):853-861.