School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
J Environ Sci (China). 2021 Mar;101:36-48. doi: 10.1016/j.jes.2020.05.029. Epub 2020 Aug 21.
Cu-Co multiple-oxides modified on HNO-pretreated activated coke (AC) were optimized for the simultaneous removal of gaseous CO and elemental mercury (Hg) at low temperature (< 200 °C). It was found that 2%CuOx-10%CoOx/AC catalyst calcined at 400°C resulted in the coexistence of complex oxides including CuO, CuO, CoO, CoO and CoO phases, which might be good for the simultaneous catalytic oxidation of CO by Co-species and removal of Hg by Cu-species, benefiting from the synergistic catalysis during the electro-interaction between Co and Cu cations (CoO ⇌ CoO and CuO ⇌ CuO). The catalysis removal of CO oxidation was obviously depended on the reaction temperature obtaining 94.7% at 200 °C, while no obvious promoting effect on the Hg removal (68.3%-78.7%). These materials were very substitute for the removal of CO and Hg° from the flue gas with the conditions of 8-20 vol.% O and flue-gas temperature below 200 °C. 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 mechanism with lattice oxygen species.
在经 HNO3 预处理的活性炭 (AC) 上修饰的 Cu-Co 多氧化物，优化了其在低温（<200°C）下同时去除气态 CO 和元素汞（Hg）的性能。研究发现，在 400°C 下煅烧的 2%CuOx-10%CoOx/AC 催化剂中存在包括 CuO、Cu2O、CoO、Co3O4 和 Co2O3 等复杂氧化物共存，这可能有利于 Co 物种同时催化氧化 CO 和 Cu 物种去除 Hg，这得益于 Co 和 Cu 阳离子之间的电相互作用（CoO ⇌ CoO 和 CuO ⇌ CuO）的协同催化。CO 氧化的催化去除明显依赖于反应温度，在 200°C 时可获得 94.7%的去除率，而对 Hg 去除（68.3%-78.7%）没有明显的促进作用。这些材料非常适合在 8-20%O 和烟气温度低于 200°C 的条件下，从烟道气中去除 CO 和 Hg°。Hg°的去除遵循通过 Langmuir-Hinshelwood 机制的吸附和催化氧化反应的组合过程，而 CO 的催化则遵循通过晶格氧物种的 Mars-van Krevelen 机制。
