4.7 Review

Recent progress of CeO2-based catalysts with special morphologies applied in air pollutants abatement: A review

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Article Energy & Fuels

Metal-organic framework-derived one-dimensional Pd@CeO2 catalysts with enhanced activity for methane oxidation

Mingwei Wu et al.

Summary: In this study, a unique 1D Pd@CeO2-BDC catalyst with rich oxygen vacancies and uniformly distributed PdO clusters and PdxCe1-xO2-s species on CeO2 surface was fabricated. The intense metal support interaction in the MOF skeleton resulted in the substitution of Ce4+ in CeO2 lattice by Pd atoms, thus significantly affecting the structure and electronic properties of the catalyst. The excellent reactivity of MOF-derived catalysts was attributed to lower energy barriers for methane activation on the reconstructed surfaces, as revealed by experimental and theoretical calculations. This research provides a new approach for the construction of lean methane combustion catalysts.
Article Chemistry, Physical

Metal-organic framework derived hollow CuO/CeO2 nano-sphere: To expose more highly dispersed Cu-O-Ce interface for enhancing preferential CO oxidation

Lei Wang et al.

Summary: By designing and synthesizing a hollow spherical CeO2 supporting Cu-3(BTC)(2) precursor shell to generate CuO/CeO2-S catalyst, the dispersion of active sites can be improved and sintering of active interfaces can be avoided, leading to enhanced catalytic performance for preferential CO oxidation in H-2-rich stream.

APPLIED SURFACE SCIENCE (2022)

Article Chemistry, Physical

Structure sensitivity of CuO in CO oxidation over CeO2-CuO/Cu2O catalysts

Zhenhua Zhang et al.

Summary: By studying the CO oxidation catalyzed by CeO2-CuO/Cu2O nanocomposites with different CuO structures, it was found that the CuO-CeO2 interfaces in the CeO2-CuO/c-Cu2O (cubes) nanocomposites exhibit higher intrinsic activity, indicating that the active oxygen species originates from CuO. An active 13.2% CeO2-CuO/c-Cu2O(s) catalyst for CO oxidation was achieved on fine Cu2O cubes, possessing a high density of active sites.

JOURNAL OF CATALYSIS (2022)

Article Engineering, Environmental

Three-dimensionally ordered macroporous Ce-W-Nb oxide catalysts for selective catalytic reduction of NOx with NH3

Ye Jiang et al.

Summary: 3DOM Ce-W-Nb ternary catalysts show excellent NH3-SCR activity, high thermal stability, and durability. The addition of Nb leads to more evenly dispersed active sites and increased specific surface area. The interaction among Ce, W, and Nb species enhances the chemisorbed oxygen, promoting SCR activity, while Nb doping boosts NH3 adsorption and facilitates the generation of active NOx species, accelerating the reaction rate.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Engineering, Environmental

Unraveling the importance between electronic intensity and oxygen vacancy on photothermocatalytic toluene oxidation over CeO2

Ying-juan Hao et al.

Summary: The study shows that high electron density of materials plays a crucial role in generating reactive oxygen species and improving photothermocatalytic activity for toluene oxidation. Excessive oxygen vacancies can be detrimental to the appearance of mobile reactive oxygen species due to strong chemical interaction and high escape probability of surface lattice oxygen in CeO2.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Engineering, Environmental

Designed preparation of nano rod shaped CeO2-MnOx catalysts with different Ce/Mn ratios and its highly efficient catalytic performance for chlorobenzene complete oxidation: New insights into structure-activity correlations

Jie Wan et al.

Summary: A series of nano rod shaped CeO2-MnOx catalysts with different Ce/Mn molar ratios were synthesized through a facile hydro-thermal method. The Ce/Mn-1/8 catalyst showed the highest catalytic activity and the least production of hazardous byproducts in the complete oxidation of chlorobenzene (CB). The outstanding performance of this catalyst can be attributed to both its unique morphology effect and the strong interaction between CeO2 and MnOx.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Engineering, Environmental

A superior cerium-tungsten bimetal oxide catalyst with flower-like structure for selective catalytic reduction of NOx by NH3

Xiaoxiang Wang et al.

Summary: A flower-like 0.1%WO3/CeO2 catalyst was fabricated with high-efficiency for the selective reduction of NOx by NH3. The flower-like structure promoted a more uniform dispersion of tungsten species on the support and a stronger interaction between WO3 and CeO2, resulting in increased acid sites and surface vacancies. The catalyst exhibited significant SCR performance, with 90% NOx conversion and 95% N2 selectivity within a wide temperature range. The study provides a new strategy for developing high-efficiency ceria supported NH3-SCR catalyst.

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Construction of a Nanorod Structure-Confined Pt@CeO2 Catalyst by an In-Situ Encapsulation Strategy for Low-Temperature Catalytic Oxidation of Toluene

Siyi Ma et al.

Summary: Pt@CeO2 catalysts with different structures were synthesized and their catalytic performance for toluene combustion was studied. The Pt@CeO2-R catalyst with a nanorod structure exhibited the best activity, which can be attributed to the confinement effect of Pt nanoparticles in Ce-MOFs, as well as the chemical state of Pt species, redox ability, and the amount of active oxygen species.

CHEMISTRY-AN ASIAN JOURNAL (2022)

Article Energy & Fuels

Chemical deactivation and resistance of Mn-based SCR catalysts for NOx removal from stationary sources

Lin-gang Wei et al.

Summary: This paper discusses the application of Mn-based catalysts in low-temperature NH3-SCR reactions, methods to improve anti-poisoning properties, and different regeneration approaches. The results obtained are crucial for optimizing Mn-based SCR catalysts.
Article Energy & Fuels

Promoting effect of Co-doped CeO2 nanorods activity and SO2 resistance for Hg0 removal

Wei He et al.

Summary: A simple hydrothermal method is used to dope cobalt species into CeO2 nanorods, which improves the reduction properties and activity of CeO2 for Hg-0 removal. Co doping increases the adsorption energy of Hg-0 and promotes the formation of oxygen vacancies, leading to enhanced activity for Hg degrees removal. The oxidation of Hg-0 over Co-doped CeO2 nanorods occurs through a Mars-van Krevelen mechanism, where Hg-0 reacts with surface oxygen to form HgO.
Article Energy & Fuels

Defective Ce3+associated CeO2 nanoleaves for enhanced CO oxidation

M. Romero-Saez et al.

Summary: By comparing the CO oxidation performance of mesoporous CeO2 nanoleaves with commercial CeO2 bulk powder, it was found that the synthesized nanoleaves showed superior performance, possibly due to the presence of cubic structure nanoleaves and line displacements, which favored more electron active sites.
Article Chemistry, Physical

Effects of chemical etching and reduction activation of CeO2 nanorods supported ruthenium catalysts on CO oxidation

Yifan Wang et al.

Summary: Pristine and NaBH4 etched CeO2 nanorods supported ruthenium catalysts were synthesized and used to investigate the effects of chemical etching and reduction activation treatment on CO oxidation. The results showed that the etched catalyst exhibited lower apparent activation energy and significantly increased H2 consumption at low temperature. In-situ analysis revealed that the strong RuOx-CeO2 interaction induced by NaBH4 etching treatment contributed to the enhanced activity of CO oxidation.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2022)

Article Engineering, Chemical

High flux asymmetric oxygen permeation membrane based on BaFe0.95Sm0.05O3-δ-Ce0.9Sm0.1O2-δ dual-phase composite

Shipeng Zeng et al.

Summary: In this study, a dual-phase oxygen permeation membrane consisting of 30 wt% perovskite phase and 70 wt% fluorite phase was prepared using a one-pot EDTA/citric-nitrate combustion method. The membrane showed improved oxygen permeability after coating with a porous LSCF layer. The asymmetric membrane exhibited excellent permeation flux at 950 degrees C.

SEPARATION AND PURIFICATION TECHNOLOGY (2022)

Article Engineering, Chemical

Aerosol-phase synthesis of bimetallic NiCu oxide-decorated CeO2 nanoparticle cluster for catalytic methane combustion

Chuan-Bin Du et al.

Summary: A raspberry-structured hybrid nanocatalyst composed of NiCu bimetallic oxide nanoparticle decorated on ceria nanoparticle cluster (NiCuOx@CeO2) was successfully synthesized via a gas-phase evaporation-induced self-assembly approach. The NiCuOx@CeO2 exhibited superior catalytic performance in methane combustion and showed high stability. The addition of CuO promoted the redox ability of NiCuOx in the hybrid nanostructure.

ADVANCED POWDER TECHNOLOGY (2022)

Article Chemistry, Physical

Investigation into the catalytic roles of oxygen vacancies during gaseous styrene degradation process via CeO2 catalysts with four different morphologies

Ying Zhang et al.

Summary: CeO2 catalysts with different morphologies showed different thermocatalytic activities for gaseous styrene degradation. Spherical CeO2 exhibited the highest activity, which was attributed to its lattice distortion and oxygen vacancy concentration. Oxygen vacancies were identified as the main active sites, and the superior performance of spherical CeO2 was attributed to the lesser accumulation of intermediates on its surface.

APPLIED CATALYSIS B-ENVIRONMENTAL (2022)

Article Engineering, Environmental

Two-step hydrothermal synthesis of highly active MnOx-CeO2 for complete oxidation of formaldehyde

Meng Wang et al.

Summary: MnOx-CeO2 catalysts prepared by either a two-step hydrothermal method or a deposition-precipitation method were evaluated for formaldehyde oxidation. The catalyst prepared by the hydrothermal method showed higher activity, which was attributed to the higher contents of Ce3+ and Mn4+ species and the generation of abundant chemisorbed oxygen species. DFT simulation confirmed the results and revealed the role of Mn loading on the CeO2 (1 1 0) plane.

CHEMICAL ENGINEERING JOURNAL (2022)

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Vacuum-treated MnxCe1-xO2 nanorods for catalytic ozonation of 1,2-dichloroethane

Yuanyuan Zhuang et al.

Summary: MnxCe1-xO2 nanorod catalysts with high catalytic performance and long-term stability were synthesized and the synergistic effect between surface acidity and oxygen vacancy played a critical role in the catalytic ozonation of DCE.

SEPARATION AND PURIFICATION TECHNOLOGY (2022)

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Enhanced catalytic oxidation of soot over 3DOM LaMnO3 by adding Ag and CeO2: Improving the generation and delivery of active oxygen species

Zhuobin Huo et al.

Summary: Ag-Ce modified 3DOM LaMnO3 catalysts synthesized by redox etching precipitation showed excellent catalytic performance for NOx-assisted soot oxidation, with good activity and water resistance. Ag and CeO2 played important roles in enhancing catalyst performance.

APPLIED SURFACE SCIENCE (2022)

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Morphology and crystal-plane dependence of CeO2-TiO2 catalysts: Activity and mechanism for the selective catalytic reduction of NOx with NH3

Wen Luo et al.

Summary: CeO2-TiO2 catalysts with different morphologies were synthesized and tested for selective catalytic reduction of NOx with NH3. The catalyst with nanospheres morphology exhibited the best performance.

CHEMICAL ENGINEERING JOURNAL (2022)

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Research progress on preparation of 3DOM-based oxide catalysts and their catalytic performances for the combustion of diesel soot particles

Chunlei Zhang et al.

Summary: This paper discusses the importance of catalytic after-treatment exhaust technology in removing diesel soot particles, focusing on the preparation methods and applications of three-dimensional ordered macroporous catalysts. The latest research progress on the catalytic performance and mechanism of these catalysts for soot particle combustion is summarized, and the future development trends are proposed.

APPLIED CATALYSIS B-ENVIRONMENTAL (2022)

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Non-equilibrium plasma enhanced oxygen vacancies of CuO/CeO2 nanorod catalysts for toluene oxidation

Jianyu Yun et al.

Summary: A series of CuO/CeO2 nanorod catalysts for toluene oxidation were prepared with non-equilibrium plasma, which can enhance the synergism between CuO active phase and CeO2 support, increase oxygen vacancies, and improve catalytic activity.

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING (2022)

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Removal of gaseous pollutants by using 3DOM-based catalysts: A review

Yuan-zhen Liu et al.

Summary: Three-dimensionally ordered macroporous (3DOM)-based catalysts are promising for controlling gaseous pollutants emissions due to their high porosity, large surface area, pore volume, and excellent mass transfer capability. Recent studies have summarized the preparation and applications of 3DOM catalysts, along with introducing their advantages and mechanisms in gaseous pollutants control. Future perspectives and directions for 3DOM-based catalysts in gaseous pollutants control have also been proposed.

CHEMOSPHERE (2021)

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Single crystalline CeO2 nanotubes

Fangxian Cao et al.

Summary: In this study, uniform single crystalline CeO(2) nanotubes were successfully prepared through a hydrothermal transformation of CeO(2) nanorods in aqueous Ce(NO3)3 solution. A chemically driven etching-dissolution-deposition mechanism was proposed to explain the formation process of CeO(2) nanotubes, which exhibited higher activity compared to CeO(2) nanorods.

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Promoting effect of Ti addition on three-dimensionally ordered macroporous Mn-Ce catalysts for NH3-SCR reaction: Enhanced N2 selectivity and remarkable water resistance

Xiaofeng Wang et al.

Summary: 3DOM-Mn3Ce1 and 3DOM-Mn3Ce1Ti1 catalysts exhibit high SCR activity and N-2 selectivity at low temperature, along with remarkable tolerance to H2O. Addition of Ti to the catalyst enhances N-2 selectivity and broadens the temperature window.

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Revealing Charge Transfer at the Interface of Spinel Oxide and Ceria during CO Oxidation

Sinmyung Yoon et al.

Summary: The study investigates the role of oxide-oxide interfaces produced by supported spinel oxide catalysts in catalytic performance. By creating interfaces between active metals and oxide supports, the CO oxidation rate was increased, demonstrating that charge transfer at the interface enhances activity.

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Solar photocatalytic H2 production over CeO2-based catalysts: Influence of chemical and structural modifications

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Cerium Oxide-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx with NH3: A Review

Jue Zhou et al.

Summary: This paper reviews the recent progress on Ce-based catalysts for low-temperature SCR de-NOx, including single CeOx, Ce-based multimetal oxide, and Ce-based multimetal oxides with support. For single CeOx, the reasons for significant catalytic activity and the function of CeOx in the reactions are systematically reviewed. In the study of multimetal oxide catalysts, the various roles played by the components of catalysts are summarized from multiple aspects.

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Double redox process to synthesize CuO-CeO2 catalysts with strong Cu-Ce interaction for efficient toluene oxidation

Yiqing Zeng et al.

Summary: A novel double redox method was developed to synthesize highly active CuO-CeO2 (CuCe-DR) catalyst, which exhibits higher Ce3+ and Cu2+ ion concentrations and stronger Cu-Ce interaction compared to CuCe-C catalyst. CuCe-DR catalyst shows higher toluene oxidation performance and stability at low temperatures, attributed to the increased surface chemisorbed oxygen and improved redox properties.

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Article Chemistry, Physical

Mechanochemically Prepared Co3O4-CeO2 Catalysts for Complete Benzene Oxidation

Lyuba Ilieva et al.

Summary: Efforts have been made to develop sustainable Co3O4-CeO2 mixed oxides for benzene oxidation at relatively low temperatures. The results show that the optimal composition of the mixed oxides exhibits superior catalytic activity, reaching 100% benzene conversion at 200°C. This eco-friendly and cost-effective catalyst shows promising potential for VOCs elimination.

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Shubhadeep Adak et al.

Summary: This study designed a polycrystalline Cu-CeO2 catalyst with defect sites, showing superior CO oxidation activity in presence of excess H-2. Characterization techniques such as XRD, TEM, Raman spectroscopy, and DRIFT spectroscopy were used to understand the mechanism of the catalyst's action.

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In-situ experimental and computational approach to investigate the nature of active site in low-temperature CO-PROX over CuOx-CeO2 catalyst

Shubhadeep Adak et al.

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APPLIED CATALYSIS A-GENERAL (2021)

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ACS CATALYSIS (2021)

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Rongli Mi et al.

Summary: By synthesizing CeO2 with varied morphologies, it was found that nanopolyhedra CeO2 exhibited superior catalytic activity for toluene combustion. Various analysis methods revealed that surface lattice oxygen plays a crucial role in the catalytic combustion of toluene on CeO2.

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