Simultaneous removal of gaseous CO and elemental mercury over Cu-Co modified activated coke at low temperature

• 作者: Fengyu Gao Hao Yan Xiaolong Tang Honghong Yi Shunzheng Zhao Qingjun Yu Shuquan Ni
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2021,（3）
• 页码范围: 36-48
• 页数: 13页
• 语种: 英文

摘要

Cu-Co multiple-oxides modified on HNO3-pretreated activated coke(ACN)were optimized for the simultaneous removal of gaseous CO and elemental mercury(Hg0)at low tempera-ture(＜ 200 ℃).It was found that 2％CuOx-10％COOx/ACN catalyst calcined at 400℃ resulted in the coexistence of complex oxides including CuO,Cu2O,Co3O4,Co2O3 and CoO phases,which might be good for the simultaneous catalytic oxidation of CO by Co-species and re-moval of Hg0 by Cu-species,benefiting from the synergistic catalysis during the electro-interaction between Co and Cu cations(CoO(?)Co3O4 and Cu2O(?)CuO).The catalysis removal of CO oxidation was obviously depended on the reaction temperature obtaining 94.7％at 200 ℃,while no obvious promoting effect on the Hg0 removal(68.3％-78.7％).These materials were very substitute for the removal of CO and Hg° from the flue gas with the con-ditions of 8-20 vol.％O2 and flue-gas temperature below 200 ℃.The removal of Hg° followed the combination processes of adsorption and catalytic oxidation reaction via Langmuir-Hinshelwood mechanism,while the catalysis of CO abided by the Mars-van Krevelen mech-anism with lattice oxygen species.