Enhancement of NO2 adsorption performance during adsorption-regeneration cycles over Pt/Ba/Al2O3 catalyst

被引：6
作者：
Wang, Yixi [1 ,3 ]
Xu, Wenqing [1 ,2 ]
Yang, Yang [1 ]
Li, Chaoqun [1 ,3 ]
Wang, Jian [1 ]
Zhu, Tingyu [1 ,2 ]
机构：
[1] Chinese Acad Sci, Res Ctr Proc Pollut Control, Natl Engn Lab Hydrometallurg Cleaner Prod Technol, Inst Proc Engn, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
FUEL | 2020年 / 279卷
基金：
国家重点研发计划;
关键词：
NOx adsorption; Regeneration; Industrial flue gas; NH3; STORAGE-REDUCTION; TRAP; MECHANISM; REMOVAL; PT/K/GAMMA-AL2O3; DEGRADATION;
D O I：
10.1016/j.fuel.2020.118409
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
In this study, NO2 adsorption on Pt/Ba/Al2O3 was investigated. Results show that NO2 adsorption on fresh samples quickly begins to penetrate due to the NO slip. However, after several adsorption-regeneration cycles by NH3, the NO slip significantly decreased and the NO2 adsorption amount apparently increased from 2.59 mg/g to about 47 mg/g at 90% adsorption efficiency. In situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) experiments indicated that the adsorbed NOx can be well reduced by NH3 at 250 degrees C, and the by-product of this process is extremely low. Combining the experimental results of electron paramagnetic resonance (EPR), it can be found that a non-reduced Ba-NO2 structure remains on the surface of the regenerated sample. At the same time, apparently signals of unpaired electrons were detected by EPR, which were considered to play an important role in NO2 adsorption. Pt/Ba/Al2O3 is considered for the capture of NO2 under unconstant concentration conditions in industrial flue gas due to its excellent adsorption-regeneration properties.
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页数：7
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