抗高温失活SCR脱硝催化剂研究进展

doi:10.11896/cldb.20090242

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Abstract The V₂O₅-WO₃(MoO₃)/TiO₂ catalysts are widely utilized in the commercial fields of selective catalytic reduction (SCR) denitration. However, many factors can result in the deactivation of the catalysts in the process of SCR denitration operation, especially in the industrial processes of waste incinerators and oil/gas turbines, among which the thermal deactivation in high-temperature flue gas is important. This review summarizes the deactivation mechanisms of the SCR catalysts at high temperatures, including the crystalline transformation of TiO₂ support, the catalytic oxidation of NH₃ by V₂O₅, and the competitive adsorption between water vapor and NH₃. Then, the developments of SCR denitration catalysts with the resistance of high-temperature deactivation are presented, i.e., improving the thermal stability of support and inhibiting the catalytic oxidation of gaseous NH₃. Ti-based composite supports, including Ti-Zr/Ti-Si supports and zeolites, are considered to be optimal for improving the thermal stability of support, while metal oxides, such as Fe₂O₃ and WO₃, are the main active components to prevent the NH₃ catalytic oxidation. In addition,the technologies for the thermal resistance improvement of SCR denitration catalysts are briefly discussed, including the addition of anti-water components and the application of hydrophobic supports. With the presence of anti-water components such as noble metals (Pt, Pd) and metal oxides (WO₃, CeO₂), the adsorption of gaseous reactants over the catalyst can be promoted. Besides, using the hydrophobic carriers, such as zeolites and carriers coated with water-resistant layers, can also suppress the adsorption of water vapor. Finally, the developing prospects of SCR denitration catalysts with superior resistance to high temperature are discussed. This review can provide some fundamental instructions for the improvement of SCR denitration catalysts with the resistance of thermal deactivation in the high-temperature flue gas.

Key words： catalysts selective catalytic reduction (SCR) deactivation high temperature NO_x emissions

Published: 10 July 2022 Online: 2022-07-12

CLC number:

X51

Fund:National Natural Science Foundation of China (51806220, 51922040), China Postdoctoral Science Foundation (2019M660594) and Fundamental Research Funds for the Central Universities (2019QN003, 2020DF01).

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	Articles by authors
	LU Qiang
	WU Yachang
	XU Mingxin
	QU Yanchao
	WANG Hanxiao
	PEI Xinqi
	OUYANG Haodong

Cite this article:

LU Qiang,WU Yachang,XU Mingxin, et al. Progress in the Development of SCR Denitration Catalysts with Resistance of High-temperature Deactivation[J]. Materials Reports, 2022, 36(13): 20090242-9.

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http://www.mater-rep.com/EN/10.11896/cldb.20090242 OR http://www.mater-rep.com/EN/Y2022/V36/I13/20090242

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