Preparation of red mud-based catalyst and performance for trace ammonia in simulative tail gas

被引：0

作者：

Wang C. ^{[1
]}

Li C. ^{[2
]}

Huangfu L. ^{[2
]}

Li P. ^{[1
]}

Yang Y. ^{[1
]}

Gao S. ^{[2
]}

Yu J. ^{[2
]}

Xu G. ^{[3
]}

机构：

[1] School of Chemical Engineering, Xiangtan University, Xiangtan, 411105, Hunan

[2] State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing

[3] Shenyang University of Chemical Technology, Shenyang, 110142, Liaoning

来源：

Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 03期

关键词：

Ammonia slip; Catalyst; ISCR; Red med; Simulation; Waste treatment;

D O I：

10.11949/j.issn.0438-1157.20181051

中图分类号：

学科分类号：

摘要：

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. © All Right Reserved.

引用

页码：1056 / 1064

页数：8

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