A Comparative Study on the Effect of Surface and Bulk Sulfates on the High-Temperature Selective Catalytic Reduction of NO with NH3 over CeO2

Herein, two CeO2 samples dominantly decorated with surface and bulk sulfates were constructed and their distinct effects on high-temperature NH3-SCR were investigated by strictly controlling the sulfate content at a comparable level. The obtainment of surface and bulk sulfates was revealed using a d...

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Bibliographic Details
Published in:Catalysts 2023-08, Vol.13 (8), p.1162
Main Authors: Tan, Chong, Gu, Zhiwen, Sin, Songil, Ji, Jiawei, Wang, Yan, Zhu, Baiyun, Cheng, Lijun, Huang, Chunkai, Li, Lulu, Zhang, Hongliang, Tang, Changjin
Format: Article
Language:English
Subjects:
Acids
Adsorption
Ammonia
bulk sulfates
Catalysts
CeO2
Cerium oxides
Chemical reactions
Chemical reduction
Coal-fired power plants
Comparative studies
Decomposition
Flue gas
Gases
High temperature
high-temperature denitration
Leaching
Oxidation
Selective catalytic reduction
Sulfates
Sulfur content
surface sulfates
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Summary:Herein, two CeO2 samples dominantly decorated with surface and bulk sulfates were constructed and their distinct effects on high-temperature NH3-SCR were investigated by strictly controlling the sulfate content at a comparable level. The obtainment of surface and bulk sulfates was revealed using a designed leaching experiment, and further evidenced by the characterization results from XPS and H2-TPR. In comparison with CeO2 modified with bulk sulfates (B-CeS), sufficient acid sites with strong intensity were generated on CeO2 modified with surface sulfates (S-CeS). In addition, due to electron-withdrawing effect from S=O in sulfate species, NH3 oxidation over S-CeS was greatly suppressed, providing an additional contribution to enhanced performance in high-temperature NH3-SCR.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal13081162