Understanding structure-performance relationships of CoOx/CeO2 catalysts for NO catalytic oxidation: Facet tailoring and bimetallic interface designing

Cheng, Xiaomin; Liu, Yiqi; Yang, Lubin; Yang, Mingjie; Zhang, Yongzheng; Ma, Cheng; Meng, Xuan; Xu, Jing; Wang, Jitong; Qiao, Wen-ming

doi:10.1016/j.jhazmat.2023.131144

Cited by 9 publications

(2 citation statements)

References 48 publications

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“…Due to the interaction between Co 3 O 4 and CeO 2 , on the composite catalysts supported on CeO 2 , bulk lattice oxygen is easily migrated, and surface oxygen vacancies are replenished to complete the cyclic process of MVK mechanism. [9,[16][17][18] Luo et al prepared a series of Co 3 O 4 À CeO 2 catalysts by soft template methods to investigate the CO reaction mechanism. The oxygen vacancies produced by CO assisted-oxidation is regarded as a vital step and the redox ability is interrelated to the oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

Chen,

Liu,

Wang

et al. 2024

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The oxygen vacancies and surface oxygen species play pivotal roles in CO catalytic oxidation. In this study, Co3O4−CeO2 supported on resin based spherical activated carbon was fabricated and the effect of CeO2 on surface oxygen species was demonstrated through controlling various Ce contents. When Ce content was optimal (nCo : nCe=9), the maximum surface adsorbed oxygen content (60.3 %) is displayed and the catalyst achieved good CO conversion (T100=110 °C), water resistance and robust stability. DFT simulation calculation confirmed that the energy barriers of two transition states significantly decreased to 0.60 eV and 0.37 eV, respectively, with the addition of CeO2. The results indicate that the presence of CeO2 is conducive to the increasement of surface adsorbed oxygen content and optimal Co/Ce ratio is the most favorable for the CO oxidation. It is attributed to the visible decline of the energy barrier between oxygen vacancies and gas–phase oxygen at the Co3O4−CeO2 interface, and the process of oxygen vacancies replenishment could be more prone to occur at the interface. This study may provide a protocol for further improving surface species on supporting catalysts.

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Section: Introductionmentioning

confidence: 99%

Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

Chen,

Liu,

Wang

et al. 2024

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“…Moreover, their high cost limits any large-scale industrial application. In recent years, transition metal oxides, such as manganese (Mn)-based, cobalt (Co)-based, and iron (Fe)-based catalysts, have become the research focus because of their high catalytic activity, low cost, and high yield [ 10 , 11 , 12 ]. Among these oxides, MnO x is considered one of the most efficient catalysts because of the Mn 4+ /Mn 3+ or Mn 3+ /Mn 2+ redox cycle related to the multivalence Mn ions, structural diversity, and good oxygen mobility.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation Activity of NO over Mullite-Supported Amorphous Manganese Oxide Catalyst

et al. 2023

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Nitric oxide (NO) can pose a severe threat to human health and the environment. Many catalytic materials that contain noble metals can oxidize NO into NO2. Therefore, the development of a low-cost, earth-abundant, and high-performance catalytic material is essential for NO removal. In this study, mullite whiskers on a micro-scale spherical aggregate support were obtained from high-alumina coal fly ash using an acid–alkali combined extraction method. Microspherical aggregates and Mn(NO3)2 were used as the catalyst support and the precursor, respectively. A mullite-supported amorphous manganese oxide (MSAMO) catalyst was prepared by impregnation and calcination at low temperatures, in which amorphous MnOx is evenly dispersed on the surface and inside of aggregated microsphere support. The MSAMO catalyst, with a hierarchical porous structure, exhibits high catalytic performance for the oxidation of NO. The MSAMO catalyst, with a 5 wt% MnOx loading, presented satisfactory NO catalytic oxidation activity at 250 °C, with an NO conversion rate as high as 88%. Manganese exists in a mixed-valence state in amorphous MnOx, and Mn4+ provides the main active sites. The lattice oxygen and chemisorbed oxygen in amorphous MnOx participate in the catalytic oxidation of NO into NO2. This study provides insights into the effectiveness of catalytic NO removal in practical industrial coal-fired boiler flue gas. The development of high-performance MSAMO catalysts represents an important step towards the production of low-cost, earth-abundant, and easily synthesized catalytic oxidation materials.

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Application of modified cerium dioxide for photocatalytic air pollution purification

Zhu,

Tian,

Wang

et al. 2024

Rare Met.

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Understanding structure-performance relationships of CoOx/CeO2 catalysts for NO catalytic oxidation: Facet tailoring and bimetallic interface designing

Cited by 9 publications

References 48 publications

Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

Catalytic Oxidation Activity of NO over Mullite-Supported Amorphous Manganese Oxide Catalyst

Application of modified cerium dioxide for photocatalytic air pollution purification

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Understanding structure-performance relationships of CoOx/CeO2 catalysts for NO catalytic oxidation: Facet tailoring and bimetallic interface designing

Cited by 9 publications

References 48 publications

Efficient CO Oxidation using Co3O4−CeO2 Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

Efficient CO Oxidation using Co3O4−CeO2 Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

Catalytic Oxidation Activity of NO over Mullite-Supported Amorphous Manganese Oxide Catalyst

Application of modified cerium dioxide for photocatalytic air pollution purification

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Product

Resources

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Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species