TiO2-Supported Catalysts in Low-Temperature Selective Reduction of NOx with NH3: A Review of Recent Progress

Selective catalytic reduction (SCR) stands out as a pivotal method for curbing NOx emissions from flue gas. The support, crucially, for SCR efficacy, loads and interacts with the active components within the catalyst. The catalysts could be amplified by the denitration performance of the catalyst by...

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Bibliographic Details
Published in:Catalysts 2024-09, Vol.14 (9), p.558
Main Authors: Bian, Xue, Wang, Jing, Bai, Yuting, Li, Yanping, Wu, Wenyuan, Yang, Yuming
Format: Article
Language:English
Subjects:
Ammonia
Catalysts
catalytic mechanism
Chemical reduction
Crystal surfaces
Denitrification
Efficiency
Emissions
Flue gas
Gases
Industrial plant emissions
Low temperature
NH3-SCR catalyst
Nitrogen
NOx
Poisoning
Poisoning (reaction inhibition)
Reaction mechanisms
Selective catalytic reduction
Sulfur
support of catalyst
Thermal stability
TiO2
Titanium dioxide
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Summary:Selective catalytic reduction (SCR) stands out as a pivotal method for curbing NOx emissions from flue gas. The support, crucially, for SCR efficacy, loads and interacts with the active components within the catalyst. The catalysts could be amplified by the denitration performance of the catalyst by enhancements in support pore structure, acidity, and mechanical robustness. These improvements ensure efficient interaction between the support and active materials, thereby optimizing the structure and property of the catalysts. TiO2 is the most commonly used support of the NH3-SCR catalyst. The catalyst with TiO2 support has poor thermal stability and a narrow temperature range, which can be improved. This paper reviews the research progress on the effects of various aspects of TiO2 support on the NH3-SCR catalyst’s performance, focusing on the TiO2 crystal type, TiO2 crystal surface, different TiO2 structures, TiO2 support preparation methods, and the effects of TiO2-X composite support on the NH3-SCR catalyst’s performance. The reaction mechanism, denitrification performance, and anti-SO2/H2O poisoning performance and mechanism of TiO2 support with different characteristics were described. At the same time, the development trend of the NH3-SCR catalyst using TiO2 as the support is prospected. It is hoped that this work can provide optimization ideas for SCR catalyst research.
ISSN:2073-4344
DOI:10.3390/catal14090558