Co-Ce-Ni Ternary Metal Oxide Modified N-activated Carbon:The Superior Low Temperature NH3-SCR Performance

• 作者: Wang Pei Li Yuan Liu Jun Liu Xiaoqing Tan Yingxin Zhang Yongfa
• 来源期刊: 中国炼油与石油化工（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Catalyst Research
• 页码范围: 84-97
• 页数: 14页
• 语种: 英文

摘要

Introducing reduced metal and nitrogen species is a powerful strategy to improve the reactivity of carbon-based materials for selective catalytic reduction of NOx with NH3. To further improve the NH3-SCR performance of non-pitch coal activated coke (NPAC), a series of metal oxides (e.g., Co, Ce, and Ni) were loaded on nitrogen modified NPAC. The outstanding performance of NPAC-N-CoCeNi as well as the superior SO2- and H2O-tolerate performance are attributed to the extra electrons caused by the modification of N species, and these extra electrons are more conducive to the electron transfer. More importantly, the interaction of the major active component Co3+ and the promoter catalysts CeO2, NiOx, or CoNiO2 can also increase the charge transfer and produce more oxygen vacancy and unsaturated chemical bonds, leading to improving the redox performance of NPAC-N-CoCeNi. In addition, the NH3-SCR reaction is promoted after the metal oxides co-doping mainly via the Mars-van-Krevelen mechanism.