Investigation of Co-doped Mn oxide catalyst for NH3-SCR activity and SO2/H2O resistance

LI, Hai-xia; Jin, Leying; ZHANG, An-chao; Sun, Zhijun; ZHANG, Xin-min; Zhu, Qifeng; Yang, Changze; Zhang, Shuaibo

doi:10.1016/s1872-5813(22)60044-6

Cited by 16 publications

(10 citation statements)

References 49 publications

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“…It can be observed that the samples exhibit almost identical vibration modes, with two broad Raman vibration bands appearing at 460 and 510 cm −1 . The vibration at 460 cm −1 is due to the superposition of the F 2g (2) and F 2g…”

Section: Raman Analysismentioning

confidence: 99%

“…However, NH 3 −SCR suffers from poor low-temperature activity, ammonia leakage, and equipment corrosion issues. 2 In CO-SCR, CO serves as the reducing agent and directly utilizes CO in the flue gas to degrade NO x , converting it into nontoxic N 2 and CO 2 . This achieves simultaneous removal of CO and NO x , effectively treating waste with waste, and the reaction process releases a significant amount of heat, which can greatly reduce the operating costs of CO-SCR denitrification systems.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the widely applied technique is NH 3 –SCR, where NH 3 acts as a reducing agent to convert NO x into N 2 . However, NH 3 –SCR suffers from poor low-temperature activity, ammonia leakage, and equipment corrosion issues . In CO-SCR, CO serves as the reducing agent and directly utilizes CO in the flue gas to degrade NO x , converting it into nontoxic N 2 and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Reduction Mechanism of NO_x by NH₃ and CO Catalyzed by Mn–Co Oxides and the Oxidation Process of CO: In Situ DRIFTS and DFT Study

Han,

Xuan,

Wang

et al. 2023

Energy Fuels

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In this study, Mn–Co bimetallic catalysts were prepared by a coprecipitation method. The effect of different Mn/Co molar ratios on the performance of NH3–SCR, CO-SCR, and CO oxidation was investigated, and a representative catalyst was selected to test the NO x catalytic activity of the NH3–CO-SCR synergy reaction. The microphysical and chemical properties of the samples were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, and other analytical techniques. The CO-assisted NH3 removal mechanism of NO x was explored through in situ diffuse reflectance infrared spectroscopy (DRIFTS) and density functional theory (DFT). The results show that MC-3 has the best NO x catalytic activity and a wider SCR reaction temperature window. In the synergy reaction, the NO x conversion rate of NH3–SCR can be reached at NH3 = 400 ppm, and the N2 selectivity is effectively improved. In situ DRIFTS and DFT results show that NH3–SCR follows the L-H mechanism. In the presence of CO, some CO competes with NH3 for adsorption on the Mn sites, which suppresses the adsorption activation of NH3 and reduces the CO oxidation activity. Second, with CO participation, the activation energy required for NH4NO3* to form is lower, which promotes its further decomposition into N2 and H2O, and is of great significance for CO-assisted NH3 removal of NO x technology.

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Section: Raman Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergistic Reduction Mechanism of NO_x by NH₃ and CO Catalyzed by Mn–Co Oxides and the Oxidation Process of CO: In Situ DRIFTS and DFT Study

Han,

Xuan,

Wang

et al. 2023

Energy Fuels

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“…As shown in Table , the PrMnO δ /3DOM ZSM-5 catalyst possessed more acidic sites, especially medium-strength acidic sites (9.03 μmol g –1 ), compared with the other catalysts. According to the literature, the excellent NO removal effect is likely due to the abundance of acidic sites and particularly medium-strength acidic sites in catalysts. , Therefore, the abundant acidic sites of the 3DOM ZSM-5-supported PrMnO δ may be beneficial to the excellent NO removal effect …”

Section: Resultsmentioning

confidence: 99%

“…According to the literature, the excellent NO removal effect is likely due to the abundance of acidic sites and particularly medium-strength acidic sites in catalysts. 47,48 Therefore, the abundant acidic sites of the 3DOM ZSM-5supported PrMnO δ may be beneficial to the excellent NO removal effect. 49 3.1.6.…”

Section: H 2 -Tpr Resultsmentioning

confidence: 99%

Simultaneous Removal of Soot and NO_x from Diesel Engines over Three-Dimensionally Ordered Macroporous ZSM-5-Supported MMnO_δ Catalysts

Wang,

Yu,

Zhao

et al. 2023

Ind. Eng. Chem. Res.

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Stability challenges and prospects for the industrial application of non‐noble catalysts for selective catalytic reduction of NO_x by CO (CO‐SCR)

Li,

Wang,

et al. 2024

ChemCatChem

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The selective catalytic reduction of NOx by CO (CO‐SCR) holds considerable promise as a simple and cost‐effective technology capable of concurrently removing CO and NOx from mobile and stationary sources. This is especially pertinent for industry sectors with high CO emissions, such as the iron and steel industry, making CO‐SCR an attractive solution with significant industrial applicability. However, the widespread adoption of this technology faces several limiting factors, of which the impacts of SO2, H2O, and O2 on catalyst performance and stability are most pronounced. Current research into these specific constraints is not yet exhaustive, rendering the comprehensive industrial implementation of CO‐SCR technology a challenging endeavour. As such, this review paper seeks to concentrate on variables that impede the industrial utilization of CO‐SCR technology. It encapsulates the existing bottlenecks and underscores the criticality of resolving the inhibitory effects of O2 on the CO‐SCR reaction as the most pressing issue in contemporary research.

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Investigation of Co-doped Mn oxide catalyst for NH3-SCR activity and SO2/H2O resistance

Cited by 16 publications

References 49 publications

Synergistic Reduction Mechanism of NO_x by NH₃ and CO Catalyzed by Mn–Co Oxides and the Oxidation Process of CO: In Situ DRIFTS and DFT Study

Synergistic Reduction Mechanism of NO_x by NH₃ and CO Catalyzed by Mn–Co Oxides and the Oxidation Process of CO: In Situ DRIFTS and DFT Study

Simultaneous Removal of Soot and NO_x from Diesel Engines over Three-Dimensionally Ordered Macroporous ZSM-5-Supported MMnO_δ Catalysts

Stability challenges and prospects for the industrial application of non‐noble catalysts for selective catalytic reduction of NO_x by CO (CO‐SCR)

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Investigation of Co-doped Mn oxide catalyst for NH3-SCR activity and SO2/H2O resistance

Cited by 16 publications

References 49 publications

Synergistic Reduction Mechanism of NOx by NH3 and CO Catalyzed by Mn–Co Oxides and the Oxidation Process of CO: In Situ DRIFTS and DFT Study

Synergistic Reduction Mechanism of NOx by NH3 and CO Catalyzed by Mn–Co Oxides and the Oxidation Process of CO: In Situ DRIFTS and DFT Study

Simultaneous Removal of Soot and NOx from Diesel Engines over Three-Dimensionally Ordered Macroporous ZSM-5-Supported MMnOδ Catalysts

Stability challenges and prospects for the industrial application of non‐noble catalysts for selective catalytic reduction of NOx by CO (CO‐SCR)

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Product

Resources

About

Synergistic Reduction Mechanism of NO_x by NH₃ and CO Catalyzed by Mn–Co Oxides and the Oxidation Process of CO: In Situ DRIFTS and DFT Study

Synergistic Reduction Mechanism of NO_x by NH₃ and CO Catalyzed by Mn–Co Oxides and the Oxidation Process of CO: In Situ DRIFTS and DFT Study

Simultaneous Removal of Soot and NO_x from Diesel Engines over Three-Dimensionally Ordered Macroporous ZSM-5-Supported MMnO_δ Catalysts

Stability challenges and prospects for the industrial application of non‐noble catalysts for selective catalytic reduction of NO_x by CO (CO‐SCR)