Hierarchically interconnected porous Mn Co3-O4 spinels for Low-temperature catalytic reduction of NO by CO

Liu, Shaomian; Ji, Yongjun; Xu, Wenqing; Zhang, Jianling; Jiang, Ruihuan; Li, Liang; Jia, Lei; Zhong, Ziyi; Xu, Guangwen; Zhu, Tong; Su, Fabing

doi:10.1016/j.jcat.2021.12.023

Cited by 25 publications

(12 citation statements)

References 44 publications

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“…Schematic diagrams of the synthesis processes of (G) hierarchically structured porous MAl 2 O 4 (Reprinted with permission from ref . Copyright 2018 American Chemical Society) and (H) HIP Mn x Co 3‑ x O 4 spinels (Reprinted with permission from ref . Copyright 2022 Elsevier Inc.).…”

Section: Preparation Of Pore-structured Metal Oxide Catalystsmentioning

confidence: 99%

Section: Preparation Of Pore-structured Metal Oxide Catalystsmentioning

confidence: 99%

“…The results showed that the macropore size could be varied by changing either the polymer and/or the metal (Ni or Co) concentration. Liu et al 92 reported that hierarchically interconnected porous (HIP) Mn x Co 3-x O 4 spinels could be synthesized by a citric acidassisted sol−gel method. The corresponding preparation process is illustrated in Figure 6H.…”

Section: Biologicalmentioning

confidence: 99%

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Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

Zhou,

Wang,

Gao

et al. 2024

ACS Catal.

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Because of their special physicochemical properties, pore-structured metal oxide catalysts are widely used in environmental catalysis, energy chemicals, fuel cells, medicine, and other related fields. In recent years, these oxides have also been increasingly studied in the catalytic purification of diesel engine exhaust gases. In this paper, the research progresses of preparation methods of porous metal oxide catalysts and their application in the catalytic purification of diesel engine exhaust were reviewed. The advantages and disadvantages of different methods for the synthesis of porous metal oxide catalysts were elaborated, as well as the mechanism comparison of different types of porous metal oxide catalysts in catalytic purification of diesel engine exhaust pollutants. Finally, the current issues on the preparation of porous metal oxide catalysts and their development trends in application of diesel engine exhaust purification were summarized and discussed. The pore-structured metal oxide catalysts are beneficial for improving the contact efficiency between catalysts and pollutants, which can enhance the catalytic purification efficiency of catalysts. Meanwhile, the intrinsic activity is the most fundamental factor for determining their catalytic activity except for porous structure effects. In addition, this paper can help researchers to deeply understand the important effect of porous metal oxide catalysts in the treatment of diesel engine exhaust pollutants and provide theoretical guidance for the design and development of high-efficiency catalysts.

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Section: Preparation Of Pore-structured Metal Oxide Catalystsmentioning

confidence: 99%

Section: Preparation Of Pore-structured Metal Oxide Catalystsmentioning

confidence: 99%

Section: Biologicalmentioning

confidence: 99%

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Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

Zhou,

Wang,

Gao

et al. 2024

ACS Catal.

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“…In contrast, among low‐cost transition metal catalysts, Co‐based catalysts are certainly one of the most highly regarded catalysts for CO‐SCR because of their good catalytic performance in the presence of O 2 . [ 16–19 ] For example, the CoCeO x catalysts exhibited 38% NO conversion and 100% N 2 selectivity at 350 °C with 2 vol% O 2 , [ 16 ] and Co 2.9 Cu 0.1 O 4 approximately achieved 75% NO conversion at 200 °C in the presence of 2.5 vol% O 2 . [ 20 ] In our previous work, the Co 3 O 4 ‐CeO 2 catalyst possessing abundant interfacial oxygen vacancies (OVs) achieved 100% NO conversion at 200 °C in the presence of 5 vol% O 2 .…”

Section: Introductionmentioning

confidence: 99%

Co Single Atoms and CoO_x Nanoclusters Anchored on Ce_0.75Zr_0.25O₂ Synergistically Boosts the NO Reduction by CO

Liu,

Ji,

Liu

et al. 2023

Adv Funct Materials

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Achieving high NO conversion and N2 selectivity in selective catalytic reduction of NO by CO (CO‐SCR) in a wide operating temperature window, particularly in the presence of high O2 concentration, remains a big challenge. Herein, guided by density functional theory (DFT) calculations, a catalyst is rationally developed with dual active centers consisting of both Co single‐atoms (SAs) and CoOx nanoclusters (NCs) co‐anchored on Ce0.75Zr0.25O2 support (CZO), which show above 99.7% NO conversion and 100% N2 selectivity at 250–400 °C under 5 vol% O2. DFT calculation and experimental results confirm a strong interaction among Co SAs, CoOx NCs, and CZO support. Co SAs enhance CO adsorption and accompany the oxygen vacancies (OVs) formation in CZO, while the CoOx NCs promote both NO conversion to nitrate intermediate and the breakage of the NO bond at OVs, thus synergistically boosting the N2 formation.

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“…Currently, transition metal oxides have been extensively applied into NO reduction by CO reaction, and the cobalt-based oxides could be the promising catalysts due to the outstanding oxygen mobility. − Nevertheless, the low-temperature catalytic activities, especially the N 2 selectivity of cobalt-based oxides are still unsatisfactory. As revealed in our previous work, the content of oxygen vacancies (OVs) in catalysts highly affected the NO dissociation, which is the rate-determining step of NO reduction by CO. , Therefore, great efforts have been made to enhance the catalytic activity over cobalt-based catalysts through tailoring the OV amount, such as metal doping, dispersing cobalt species on the supports, and direct regulation the OVs by surface reduction. − Among these modification methods, the metal doping into Co 3 O 4 was clarified to be an efficient method to elongate the Co–O bond length to weaken the bond strength. − It is predictable that the doped cations could enhance the catalytic activity for NO reduction by CO through promoting the redox properties as well as the formation of more OVs. Therefore, the selection of metal cations is important for the catalytic performance enhancement of the cobalt-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Enhanced Activity and Effect of H₂O/O₂ on the Low-Temperature NO Reduction by CO over Ag-Modified Porous Co₃O₄ Nanosheets

Wang

Fan

et al. 2022

J. Phys. Chem. C

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The cobalt-based catalysts were broadly investigated in NO reduction with CO; however, further development is limited by the poor low-temperature catalytic activity and H2O/O2 resistance. Herein, a series of Ag-doped Co3O4 porous nanosheets (xAgCo) were synthesized and applied into NO reduction with CO reaction. The formation of more oxygen vacancies of xAgCo catalysts was promoted by the weakened Co–O bond strength; therefore, the redox properties and oxygen mobility were enhanced. The xAgCo catalysts reached superior catalytic activities compared with Co3O4. Especially, 0.02AgCo exhibited the optimal catalytic performance, achieving the lowest apparent active energy (E a = 34 kJ mol–1). The enhanced catalytic activity of xAgCo could be attributed to the optimized CO adsorption, promoted NO dissociation, and the formation of *NCO species. The 5 vol % H2O enhanced the NO conversion through promoting the decomposition of accumulated carbonate species. Meanwhile, the O2 or 10 vol % H2O inhibited the NO conversion due to the coverage of active sites and the competitive adsorption/reaction.

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Hierarchically interconnected porous Mn Co3-O4 spinels for Low-temperature catalytic reduction of NO by CO

Cited by 25 publications

References 44 publications

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

Co Single Atoms and CoO_x Nanoclusters Anchored on Ce_0.75Zr_0.25O₂ Synergistically Boosts the NO Reduction by CO

Unraveling the Enhanced Activity and Effect of H₂O/O₂ on the Low-Temperature NO Reduction by CO over Ag-Modified Porous Co₃O₄ Nanosheets

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Hierarchically interconnected porous Mn Co3-O4 spinels for Low-temperature catalytic reduction of NO by CO

Cited by 25 publications

References 44 publications

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

Co Single Atoms and CoOx Nanoclusters Anchored on Ce0.75Zr0.25O2 Synergistically Boosts the NO Reduction by CO

Unraveling the Enhanced Activity and Effect of H2O/O2 on the Low-Temperature NO Reduction by CO over Ag-Modified Porous Co3O4 Nanosheets

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Product

Resources

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Co Single Atoms and CoO_x Nanoclusters Anchored on Ce_0.75Zr_0.25O₂ Synergistically Boosts the NO Reduction by CO

Unraveling the Enhanced Activity and Effect of H₂O/O₂ on the Low-Temperature NO Reduction by CO over Ag-Modified Porous Co₃O₄ Nanosheets