NOx reduction on Ceria: Impact of lean-rich cycling

Zhou, Zhiyu; Harold, Michael P.; Luss, Dan

doi:10.1016/j.apcatb.2018.08.050

Cited by 26 publications

(6 citation statements)

References 44 publications

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“…Mechanisms. Combination with the above results and the relevant literature, 35 a cyclic mechanism was established for NO storage and reduction over Rh1Cu5Ba5Ce with O 2 as an oxidant and CO as the sole reductant, as depicted in Figure 5a. The mechanism assumes that N 2 is the main product of the NO x reduction reactions involved in this work.…”

Section: Structural and Texturalsupporting

confidence: 69%

“…The result further demonstrated that Rh loading promoted electron transfer between Rh–Ce–Cu. In general, the increase of Ce 3+ promoted the formation of oxygen vacancies, thus increasing the adsorption of NO x . The O 1s XPS spectra of the catalysts are shown in Figure g.…”

Section: Resultsmentioning

confidence: 94%

“…In general, the increase of Ce 3+ promoted the formation of oxygen vacancies, thus increasing the adsorption of NO x . 35 The O 1s XPS spectra of the catalysts are shown in Figure 2g. The band at higher binding energy (531.48 eV) is ascribed to the surface oxygen O 2 2− and O − (O α ), the peak at lower binding energy (529.23 eV) is assigned to the lattice oxygen O 2− (O β ).…”

Section: Structural and Texturalmentioning

confidence: 99%

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Revealing the Roles of Rh in Inhibiting “NO_x Puff” on the Cu/Ba-CeO₂ Catalyst during the Process of Lean NO_x Trap

Pei,

Fan,

et al. 2024

Ind. Eng. Chem. Res.

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Lean NO x traps (LNTs) have proven to be efficient in mitigating NO x emissions from light-duty diesel or lean-burn engines. Nevertheless, "NO x puff" is usually observed on conventional LNT catalysts due to the release of previously stored NO x rather than reducing it during the initial lean-burn period, which significantly lowers the overall NO x removal efficiency. Thus, Rh was introduced into the Cu5Ba5Ce catalyst with an excellent NO x storage performance to address the "NO x puff" issue in this work. The onset of the "NO x puff" on Rh1Cu5Ba5Ce during the initial phase of the rich-burn period is effectively controlled. The concentration of the "NO x puff" is decreased from 1200 ppm on Cu5Ba5Ce to 400 ppm on Rh1Cu5Ba5Ce. Moreover, the NO x storage and removal efficiency are improved from 75.2 and 22.0% on Cu5Ba5Ce to 99.1 and 74.2% on the Rh1Cu5Ba5Ce catalyst, respectively. The concentration of oxygen vacancies is increased, and the adsorption behavior of CO is adjusted by the introduction of Rh. The concentrations of Ce 3+ , Cu 2+ , and surface oxygen are promoted, which are contributed to enhance the amount of NO x adsorption and storage. The introduction of Rh compensates for the insufficient reduction capability of the Cu5Ba5Ce catalyst during the initial lean-burn period, enhancing the reactivity of NO x and CO. Finally, the "NO x puff" was inhibited by NO catalytic reduction with CO to improve NO x removal efficiency. This study provides an efficient strategy to address "NO x puff" issues on Ce-based LNT catalysts.

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Section: Structural and Texturalsupporting

confidence: 69%

Section: Resultsmentioning

confidence: 94%

Section: Structural and Texturalmentioning

confidence: 99%

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Revealing the Roles of Rh in Inhibiting “NO_x Puff” on the Cu/Ba-CeO₂ Catalyst during the Process of Lean NO_x Trap

Pei,

Fan,

et al. 2024

Ind. Eng. Chem. Res.

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“…The manganese (OMS-2) is shown to promote the conversion of CO to CO 2 , 33,34 which in turn is beneficial for the electron transfer from CO to NO. The CeO 2 tends to direct the selectivity to N 2 in the NO reduction with CO. 35,36 A ternary PdO−CeO 2 −OMS-2 nanocomposite based on these components is shown to exhibit high activity at 100% N 2 selectivity and remarkable tolerance against H 2 O and SO 2 . Based on the experimental work and theoretical calculations, a feasible reaction mechanism for the NO reduction with CO over the PdO−CeO 2 −OMS-2 composite has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Ternary PdO–CeO₂–OMS-2 Catalyst Afford High Catalytic Performance and Stability in the Reduction of NO with CO

Guo

Zhang

Han

et al. 2020

ACS Appl. Mater. Interfaces

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We developed a robust ternary PdO–CeO2–OMS-2 catalyst with excellent catalytic performance in the selective reduction of NO with CO using a strategy based on combining components that synergistically interact leading to an effective abatement of these toxic gases. The catalyst affords 100% selectivity to N2 at the nearly full conversion of NO and CO at 250 °C, high stability in the presence of H2O, and a remarkable SO2 tolerance. To unravel the origin of the excellent catalytic performance, the structural and chemical properties of the PdO–CeO2–OMS-2 nanocomposite were analyzed in the as-prepared and used state of the catalyst, employing a series of pertinent characterization methods and specific catalytic tests. The experimental as well as theoretical results, based on density-functional theory calculations suggest that CO and NO follow different reaction pathways, CO is preferentially adsorbed and oxidized at Pd sites (PdII and Pd0), while NO decomposes on the ceria surface. Lattice oxygen vacancies at the interfacial perimeter of PdO–CeO2 and PdO–OMS-2, and the diffusion of oxygen and oxygen vacancies are proposed to play a critical role in this multicenter reaction system.

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“…Within coal-fired power plants (major sources of NO pollution), various flue gas denitrification methods such as selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), and wet absorption are employed for NO removal. 4 Despite their high efficiency in removing NO, a considerable amount still escapes into the atmosphere as an atmospheric pollutant. Henceforth, developing a method for effectively eliminating low concentrations of airborne NO holds immense significance.…”

Section: Introductionmentioning

confidence: 99%

The temperature-controlled optimization of g-C₃N₄ structure significantly enhances the efficiency of photothermal catalytic NO removal

Qi,

Tan,

et al. 2024

J. Mater. Chem. A

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NOx reduction on Ceria: Impact of lean-rich cycling

Cited by 26 publications

References 44 publications

Revealing the Roles of Rh in Inhibiting “NO_x Puff” on the Cu/Ba-CeO₂ Catalyst during the Process of Lean NO_x Trap

Revealing the Roles of Rh in Inhibiting “NO_x Puff” on the Cu/Ba-CeO₂ Catalyst during the Process of Lean NO_x Trap

Synergistic Effects of Ternary PdO–CeO₂–OMS-2 Catalyst Afford High Catalytic Performance and Stability in the Reduction of NO with CO

The temperature-controlled optimization of g-C₃N₄ structure significantly enhances the efficiency of photothermal catalytic NO removal

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NOx reduction on Ceria: Impact of lean-rich cycling

Cited by 26 publications

References 44 publications

Revealing the Roles of Rh in Inhibiting “NOx Puff” on the Cu/Ba-CeO2 Catalyst during the Process of Lean NOx Trap

Revealing the Roles of Rh in Inhibiting “NOx Puff” on the Cu/Ba-CeO2 Catalyst during the Process of Lean NOx Trap

Synergistic Effects of Ternary PdO–CeO2–OMS-2 Catalyst Afford High Catalytic Performance and Stability in the Reduction of NO with CO

The temperature-controlled optimization of g-C3N4 structure significantly enhances the efficiency of photothermal catalytic NO removal

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Revealing the Roles of Rh in Inhibiting “NO_x Puff” on the Cu/Ba-CeO₂ Catalyst during the Process of Lean NO_x Trap

Revealing the Roles of Rh in Inhibiting “NO_x Puff” on the Cu/Ba-CeO₂ Catalyst during the Process of Lean NO_x Trap

Synergistic Effects of Ternary PdO–CeO₂–OMS-2 Catalyst Afford High Catalytic Performance and Stability in the Reduction of NO with CO

The temperature-controlled optimization of g-C₃N₄ structure significantly enhances the efficiency of photothermal catalytic NO removal