化工学报2019，Vol.70Issue(3)：1056-1064,9.DOI:10.11949/j.issn.0438-1157.20181051
赤泥催化剂的制备及其对模拟烟气中微量氨的脱除性能
Preparation of red mud-based catalyst and performance for trace ammonia in simulative tail gas
摘要
Abstract
A Fe-based powder catalyst was prepared from red mud (RM) solid waste with acid base neutralization method, which was used to eliminate the trace ammonia thought the proposed process of directly spraying the catalyst into SNCR tail gas. The effects of temperature, space velocity, NH3 concentration and water vapor on ammonia removal capacity of the catalyst were investigated in details, and excellent removal efficiency could be achieved with 100％ NH3 conversion above 450℃ as well as＞ 80％ selectivity of N2 between 400-500℃.Especially, the trace ammonia in the tail gas can completely be cleared with 0 left between the space velocity of 3×106-6×106 h-1 at 500℃. Meanwhile, the catalytic process is also effective for the removal of NH3 with wide concentration of (40×10-6～800×10-6 mol/L) even in the presence of water. The multiple characterizations further revealed that the strong alkalinity of the original solid waste was removed together with the increase of surface acidity as well as large specific surface area and rich surface microstructure for the obtained red mud catalyst, which accounts for its significant increase of adsorption and activation of NH3. Moreover, it was found the removal process of NH3 follows the internal selective catalytic reduction (iSCR) mechanism, and the NH3 was eliminated through both the NH3-SCR and NH3-SCO reactions, which mainly function below 400℃ and between 400-500℃, respectively.关键词
氨逃逸/废物处理/赤泥/催化剂/模拟/内部催化氧化Key words
ammonia slip/waste treatment/red med/catalyst/simulation/iSCR分类
化学化工引用本文复制引用
王超,李长明,皇甫林,李萍,杨运泉,高士秋,余剑,许光文..赤泥催化剂的制备及其对模拟烟气中微量氨的脱除性能[J].化工学报,2019,70(3):1056-1064,9.基金项目
国家自然科学基金青年基金项目(21601192) （21601192）
中日政府间国际合作项目(2016YFE0128300) （2016YFE0128300）
多项复杂系统国家重点实验室自主研究课题(MPCS-2017-A-06) （MPCS-2017-A-06）
多项复杂系统国家重点实验室自主研究课题(MPCS-2017-D-11) （MPCS-2017-D-11）
