Overwhelming low ammonia escape and low temperature denitration efficiency via MnOx-decorated two-dimensional MgAl layered double oxides

Junqi Tian; Yanqin Li; Xia Zhou; Yongbin Yao; Denghao Wang; Jianming Dan; Bin Dai; Qiang Wang; Feng Yu

doi:10.1016/j.cjche.2020.01.004

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Overwhelming low ammonia escape and low temperature denitration efficiency via MnO_x-decorated two-dimensional MgAl layered double oxides

Energy, Resources and Environmental Technology | Updated：2026-01-06

- Overwhelming low ammonia escape and low temperature denitration efficiency via MnO_x-decorated two-dimensional MgAl layered double oxides
- Overwhelming low ammonia escape and low temperature denitration efficiency via MnO_x-decorated two-dimensional MgAl layered double oxides
- 中国化学工程学报（英文版） 2020年28卷第7期页码：1925-1934
- Affiliations：
  
  1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University,Shihezi,China,832003
  2. Environmental Functional Nanomaterials Laboratory, College of Environmental Science and Engineering, Beijing Forestry University,Beijing,China,100083
  3. Bingtuan Industrial Technology Research Institute, Shihezi University,Shihezi,China,832003
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2020.01.004
  中图分类号：
- 纸质出版：2020
- Accepted：
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Junqi Tian, Yanqin Li, Xia Zhou, 等. Overwhelming low ammonia escape and low temperature denitration efficiency via MnO_x-decorated two-dimensional MgAl layered double oxides[J]. 中国化学工程学报（英文版）, 2020,28(7):1925-1934. DOI: 10.1016/j.cjche.2020.01.004.

MnO
Junqi Tian, Yanqin Li, Xia Zhou, 等. Overwhelming low ammonia escape and low temperature denitration efficiency via MnO_x-decorated two-dimensional MgAl layered double oxides[J]. 中国化学工程学报（英文版）, 2020,28(7):1925-1934. DOI: 10.1016/j.cjche.2020.01.004. DOI：

MnO DOI： 10.1016/j.cjche.2020.01.004.

摘要

Abstract

Low temperature catalysts are attracting increasing attention in the selective catalytic reduction (SCR) of NO with NH

. MnO

-decorated MgAl layered double oxide (Mn/MgAl-LDO) was synthesized

via

a facile fast pour assisted co-precipitation (FP-CP) process. Compared to the Mn/MgAl-LDO obtained

via

slow drop assisted coprecipitation (SD-CP) method

the Mn/MgAl-LDO (FP-CP) has excellent activity. The Mn/MgAl-LDO (FP-CP) catalyst was shown to possess a high NO conversion rate of 76%-100% from 25 to 150 ℃

which is much better than the control Mn/MgAl-LDO (SD-CP) (29.4%-75.8%). In addition

the Mn/MgAl-LDO (FP-CP) offered an enhanced NO conversion rate of 97% and a N

selectivity of 97.3% at 100 ℃; the NO conversion rate was 100% and the N

selectivity was 90% at 150 ℃ with a GHSV of 60

000 h

-1

. The Mn/MgAl-LDO (FP-CP) catalyst exhibited a smaller fragment nano-sheet structure (sheet thickness of 7.23 nm). An apparent lattice disorder was observed in the HRTEM image confirming the presence of many defects. The H

-TPR curves

show that the Mn/MgAl-LDO (FPCP) catalyst has abundant reducing substances. Furthermore

the enhanced surface acidity makes the NH

concentration of the Mn/MgAl-LDO (FP-CP) catalyst lower than 100 ml·m

-3

after the reaction from 25 to 400 ℃. This can effectively reduce the ammonia escape rate in the SCR reaction. Thus

the Mn/MgAl-LDO (FP-CP) catalyst has potential applications in stationary industrial installations for environmentally friendly ultra-low temperature SCR.

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