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Review
. 2022 Aug 17:10:946133.
doi: 10.3389/fchem.2022.946133. eCollection 2022.

Progress of selective catalytic reduction denitrification catalysts at wide temperature in carbon neutralization

Dehai Lin  1   2 , Longhui Zhang  1 , Zilin Liu  1 , Baodong Wang  1 , Yifan Han  2
Affiliations
Review

Progress of selective catalytic reduction denitrification catalysts at wide temperature in carbon neutralization

Dehai Lin et al. Front Chem. .

Abstract

With the looming goal of carbon neutrality and increasingly stringent environmental protection policies, gas purification in coal-fired power plants is becoming more and more intense. To achieve the NOx emission standard when coal-fired power plants are operating at full load, wide-temperature denitrification catalysts that can operate for a long time in the range of 260-420°C are worthy of study. This review focuses on the research progress and deactivation mechanism of selective catalytic reduction (SCR) denitration catalysts applied to a wide temperature range. With the increasing application of SCR catalysts, it also means that a large amount of spent catalysts is generated every year due to deactivation. Therefore, it is necessary to recycle the wide temperature SCR denitration catalyst. The challenges faced by wide-temperature SCR denitration catalysts are summarized by comparing their regeneration processes. Finally, its future development is prospected.

Keywords: SCR denitration; carbon neutralization; deactivation mechanism; regeneration; wide- temperature catalyst.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

FIGURE 1
FIGURE 1
Overview of NOX removal technology (Mladenović et al., 2018).
FIGURE 2
FIGURE 2
SCR technology route for controlling nitrogen oxide emissions.
FIGURE 3
FIGURE 3
Preparation and performance of WO3 supported CeO2 SCR catalyst (He et al., 2021).
FIGURE 4
FIGURE 4
Novel Mn-Ni spinel nanosheets fabricated by UH and UHHS and their NOx removal, H2O and SO2 resistance (Gao et al., 2020).
FIGURE 5
FIGURE 5
Schematic diagram of the structure of four different crystal forms of Fe2O3, (the colored ball in the center of the polyhedron represents the Fe atom, and the white atom on the edge represents the oxygen atom (Sakurai et al., 2009).
FIGURE 6
FIGURE 6
Microwave-assisted loading of phosphotungstic heteropolyacids on Fe2O3 surfaces: (A–D) Microstructure: (E) NO2 adsorption effect; (F) NOx removal effect (Ren et al., 2017b).
FIGURE 7
FIGURE 7
Comparison of NH3-SCR performance of Cu-SSZ-13 and Cu-SSZ-39 after high temperature hydrothermal treatment at 850°C (Shan et al., 2020).
FIGURE 8
FIGURE 8
SCR catalyst plugged (A) and deactivated (B) (Li et al., 2016).
FIGURE 9
FIGURE 9
K2O poisoning mechanism on CeO2 surface (Li et al., 2016).
FIGURE 10
FIGURE 10
Schematic diagram of the desulfurization regeneration experimental device (Xie et al., 2003).
See this image and copyright information in PMC

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