杂原子
催化作用
氮氧化物
化学
碳纤维
掺杂剂
氮气
选择性催化还原
密度泛函理论
氧气
无机化学
选择性
兴奋剂
化学工程
材料科学
有机化学
计算化学
戒指(化学)
光电子学
复合数
工程类
复合材料
燃烧
作者
Xuhan Li,Fei Sun,Zhibin Qu,Xiao Zhu,Jihui Gao,Guangbo Zhao,Liqiang Zhang
标识
DOI:10.1016/j.cej.2022.140098
摘要
Heteroatom doping in carbon catalysts has been shown to enhance the low-temperature selective catalytic reduction of NOx with NH3 (NH3-SCR); however, precise identification of active structure and activity origin remains challenging as various heteroatoms co-existence. Here, we provide a new insight into the synergistic effects of oxygen and nitrogen dual-dopants on carbon-catalyzed NH3-SCR. Density functional theory calculations reveal a new reaction pathway that the quaternary N enhances O2 activation and NO oxidation, and carboxyl as Bronsted acid site coupling H2O as H mediator decreases energy barriers of intermediate NH2NO evolution by enhancing H transfer, which was further experimentally verified by model activated cokes with controllable doping patterns. The dual-doped activated coke delivers superior NO conversion (∼90 %) and N2 selectivity (above 90 %) with H2O presence and corresponding kinetic and in-situ characterizations evidence the reaction pathway on dual-doped carbon. This work guides the design of high-performance heteroatom doped carbon catalysts for NH3-SCR.
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