Unveiling H2O2-optimized NOx adsorption-selective catalytic reduction (AdSCR) performance of WO3/CeZrO2 catalyst

Huang, Yan; Liu, Shuang; Pei, Ming-Ming; Li, Jia-Yi; Xu, Hai-Di; Chen, Yao-Qiang

doi:10.1007/s12598-023-02369-y

Cited by 11 publications

(2 citation statements)

References 55 publications

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“…In recent decades, significant success has been achieved in NO x emission control worldwide due to the stringent regulations and efforts from both industry and academia . Among those strategies for NO x elimination, − selective catalytic reduction of NO x by NH 3 (NH 3 –SCR of NO x ) is the most widely applied. − Although the commercial V 2 O 5 –WO 3 (MoO 3 )/TiO 2 catalyst has been proven to be capable of efficient NH 3 –SCR of NO x in high-temperature (>300 °C) flue gas emitted by electric-power industry, the new requirements for the NO x emission control in nonelectric industries made V 2 O 5 –WO 3 (MoO 3 )/TiO 2 sometimes incompetent due to the low temperature of flue gas containing multiple toxic elements (e.g., SO 2 , H 2 O, alkali and chloride, etc.). Besides, the discarded V 2 O 5 –WO 3 (MoO 3 )/TiO 2 catalyst is considered a new solid pollutant because of the biological toxicity of vanadium .…”

Section: Introductionmentioning

confidence: 99%

Modulating the Activity and SO₂ Resistance of α-Fe₂O₃ Catalysts for NH₃–SCR of NO_x via Crystal Facet Engineering

Cheng,

Xu,

Yang

et al. 2024

Environ. Sci. Technol.

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The development of Fe-based catalysts for the selective catalytic reduction of NO x by NH 3 (NH 3 −SCR of NO x ) has garnered significant attention due to their exceptional SO 2 resistance. However, the influence of different sulfur-containing species (e.g., ferric sulfates and ammonium sulfates) on the NH 3 − SCR activity of Fe-based catalysts as well as its dependence on exposed crystal facets of Fe 2 O 3 has not been revealed. This work disclosed that nanorod-like α-Fe 2 O 3 (Fe 2 O 3 −NR) predominantly exposing (110) facet performed better than nanosheet-like α-Fe 2 O 3 (Fe 2 O 3 −NS) predominantly exposing (001) facet in NH 3 −SCR reaction, due to the advantages of Fe 2 O 3 −NR in redox properties and surface acidity. Furthermore, the results of the SO 2 /H 2 O resistance test at a critical temperature of 250 °C, catalytic performance evaluations on Fe 2 O 3 −NR and Fe 2 O 3 −NS sulfated by SO 2 + O 2 or deposited with NH 4 HSO 4 (ABS), and systematic characterization revealed that the reactivity of ammonium sulfates on Fe 2 O 3 catalysts to NO(+O 2 ) contributed to their improved catalytic performance, while ferric sulfates showed enhancing and inhibiting effects on NH 3 −SCR activity on Fe 2 O 3 −NR and Fe 2 O 3 −NS, respectively; despite this, Fe 2 O 3 −NR showed higher affinity for SO 2 + O 2 . This work set a milestone in understanding the NH 3 −SCR reaction on Fe 2 O 3 catalysts in the presence of SO 2 from the aspect of crystal facet engineering.

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Section: Introductionmentioning

confidence: 99%

Modulating the Activity and SO₂ Resistance of α-Fe₂O₃ Catalysts for NH₃–SCR of NO_x via Crystal Facet Engineering

Cheng,

Xu,

Yang

et al. 2024

Environ. Sci. Technol.

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“…Adamowska et al proposed that there were three types of NO x storage sites on Ce 0.63 Zr 0.37 O 2 , which were mainly determined by the unsaturation degree of support and Ce oxidation state . Additionally, it was reported that the adsorption-storage of NO 2 on Ce x Zr 1– x O 2 was directly related to the Ce 3+ species and oxygen vacancy, with NO x stored as nitrites first at room temperature and then as nitrates due to the interaction with reactive oxygen species. , Consequently, the concentration of oxygen vacancy was usually positively correlated with the NO x adsorption-storage capacity, and oxygen storage performance was directly related to the formation rate of NO 2 . − Several areas of research have revealed that appropriate reductive treatment of CeZrO x could increase the concentration of surface oxygen vacancies and the NO x adsorption-storage capacity could be increased accordingly. , …”

Section: Introductionmentioning

confidence: 99%

Unique κ-Ce₂Zr₂O₈ Superstructure Promoting the NO_x Adsorption-Selective Catalytic Reduction (AdSCR) Performance of the WO₃/CeZrO_x Catalyst

Liu,

Huang,

et al. 2023

Environ. Sci. Technol.

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Selective catalytic reduction of NO x by NH3 (NH3-SCR) for diesel emission control at low temperatures is still a great challenge due to the limit of the urea injection threshold and inferior SCR activity of state-of-the-art catalyst systems below 200 °C. Fabricating bifunctional catalysts with both low temperature NO x adsorption-storage capacity and medium-high temperature NO x reduction activity is an effective strategy to solve the issues mentioned above but is rarely investigated. Herein, the WO3/Ce0.68Zr0.32O x (W/CZ) catalyst containing the κ-Ce2Zr2O8 pyrochlore structure was successfully developed by a simple H2 reduction method, not only showing superior NO x adsorption-storage ability below 180 °C but also exhibiting excellent NH3-SCR activity above 180 °C. The presence of the pyrochlore structure effectively increased the oxygen vacancies on the κ-Ce2Zr2O8-containing W/CZ catalyst with enhanced redox property, which significantly promoted the NO x adsorption-storage as active nitrate species below 180 °C. Upon NH3 introduction above 180 °C, the κ-Ce2Zr2O8-containing W/CZ catalyst showed greatly improved NO x reduction performance, suggesting that the pyrochlore structure played a vital role in improving the NO x adsorption-selective catalytic reduction (AdSCR) performance. This work provides a new perspective for designing bifunctional CeZrO x -based catalysts to efficiently control the NO x emissions from diesel engines during the cold-start process.

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Highly efficient Ag/Ce–Zr catalyst for catalytic oxidation of NVOCs: balance of redox ability and acidity

Guo,

Sun,

Gao

et al. 2024

Rare Met.

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Unveiling H2O2-optimized NOx adsorption-selective catalytic reduction (AdSCR) performance of WO3/CeZrO2 catalyst

Cited by 11 publications

References 55 publications

Modulating the Activity and SO₂ Resistance of α-Fe₂O₃ Catalysts for NH₃–SCR of NO_x via Crystal Facet Engineering

Modulating the Activity and SO₂ Resistance of α-Fe₂O₃ Catalysts for NH₃–SCR of NO_x via Crystal Facet Engineering

Unique κ-Ce₂Zr₂O₈ Superstructure Promoting the NO_x Adsorption-Selective Catalytic Reduction (AdSCR) Performance of the WO₃/CeZrO_x Catalyst

Highly efficient Ag/Ce–Zr catalyst for catalytic oxidation of NVOCs: balance of redox ability and acidity

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Unveiling H2O2-optimized NOx adsorption-selective catalytic reduction (AdSCR) performance of WO3/CeZrO2 catalyst

Cited by 11 publications

References 55 publications

Modulating the Activity and SO2 Resistance of α-Fe2O3 Catalysts for NH3–SCR of NOx via Crystal Facet Engineering

Modulating the Activity and SO2 Resistance of α-Fe2O3 Catalysts for NH3–SCR of NOx via Crystal Facet Engineering

Unique κ-Ce2Zr2O8 Superstructure Promoting the NOx Adsorption-Selective Catalytic Reduction (AdSCR) Performance of the WO3/CeZrOx Catalyst

Highly efficient Ag/Ce–Zr catalyst for catalytic oxidation of NVOCs: balance of redox ability and acidity

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Modulating the Activity and SO₂ Resistance of α-Fe₂O₃ Catalysts for NH₃–SCR of NO_x via Crystal Facet Engineering

Modulating the Activity and SO₂ Resistance of α-Fe₂O₃ Catalysts for NH₃–SCR of NO_x via Crystal Facet Engineering

Unique κ-Ce₂Zr₂O₈ Superstructure Promoting the NO_x Adsorption-Selective Catalytic Reduction (AdSCR) Performance of the WO₃/CeZrO_x Catalyst