炭基材料负载型低温NH_3-SCR脱硝催化剂的研究进展
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摘要
氮氧化物(NO_x)是主要的大气污染物之一,对人体健康和生态环境造成了严重危害。低温选择性催化还原(SCR)技术是近年来烟气脱硝领域的主要研究方向。炭基材料具有较大的比表面积、发达的孔隙结构等特点,在SCR脱硝方面被广泛用作催化剂载体。本文综述了炭基材料包括活性炭(焦)、活性炭纤维、碳纳米管、石墨烯及碳包覆负载型催化剂在低温NH_3-SCR脱硝领域的研究成果与进展,阐述了表面官能团、反应条件及稀土元素等因素对炭基材料负载型催化剂脱硝性能的影响,并且讨论了炭基材料负载型催化剂的催化反应机理。指出采用多种手段改性催化剂,优化其中低温脱硝性能与稳定性,深入探究催化剂表面反应物种的吸附-活化行为和催化反应路径是炭基材料负载型低温NH_3-SCR催化剂研究的重点。
Nitrogen oxides(NO_x) are one class of the major air pollutants, which has brought serious problems to human health and ecological environment. Low temperature selective catalytic reduction(SCR) technology is the main research direction of flue gas denitrification in recent years. Carbon-based materials have been extensively studied as catalyst carriers in SCR field because of their large specific surface area, porous structure and many other characteristics. The researches about the carbon-based materials including activated carbon(coke), activated carbon fiber, carbon nanotubes, graphene, and about the carbon coated catalysts in the field of low-temperature ammonia selective catalytic reduction(NH_3-SCR) denitrification are reviewed. The effects of surface functional groups, reaction conditions and rare earth elements on the denitration performance of carbon-based supported catalysts are described.The catalytic reaction mechanism of carbon-based materials is also discussed. The future research focuses of the carbon-based SCR catalysts should be placed on modifying them by various methods,optimizing the denitrification performance and stability under moderate and low temperature conditions and further exploring the adsorption-activation behavior and catalytic pathway of the reaction species on the catalyst surface.
Nitrogen oxides(NO_x) are one class of the major air pollutants, which has brought serious problems to human health and ecological environment. Low temperature selective catalytic reduction(SCR) technology is the main research direction of flue gas denitrification in recent years. Carbon-based materials have been extensively studied as catalyst carriers in SCR field because of their large specific surface area, porous structure and many other characteristics. The researches about the carbon-based materials including activated carbon(coke), activated carbon fiber, carbon nanotubes, graphene, and about the carbon coated catalysts in the field of low-temperature ammonia selective catalytic reduction(NH_3-SCR) denitrification are reviewed. The effects of surface functional groups, reaction conditions and rare earth elements on the denitration performance of carbon-based supported catalysts are described.The catalytic reaction mechanism of carbon-based materials is also discussed. The future research focuses of the carbon-based SCR catalysts should be placed on modifying them by various methods,optimizing the denitrification performance and stability under moderate and low temperature conditions and further exploring the adsorption-activation behavior and catalytic pathway of the reaction species on the catalyst surface.
引文
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