Supervariate Ceramics: Gelatinous and Monolithic Ceramics Fabricated under Ambient Conditions

Wang, Hao; Bao, Yan; Mao, Zhengyi; Bian, Haidong; Xu, Zhengtao; J, Lu; Li, Yang Yang

doi:10.1002/adem.202100866

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…Moreover, O 3 is easily decomposed into O* and O 2 on the catalyst's surface. We deduce that the catalytic oxidation of NO by O* in cooperation with CuO X @ MnO X mainly follows the Eley-Rideal (E-R) reaction mechanism, [53,54] and the reaction pathway is exhibited in Figure 7.…”

Section: Resultsmentioning

confidence: 92%

Hetero‐Shelled Hollow Structure Coupled with Non‐Thermal Plasma Inducing Spatial Charge Rearrangement for Superior NO Conversion and Sulfur Resistance

Liao

Zhao

Yang

et al. 2022

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environmental compatibility. [2] However, the coexistence of NO and SO 2 in the flue gas makes the deactivation of the traditional catalysts, due to the competition adsorption of SO 2 and NO on the active sites of the catalyst surface, resulting in the change of catalyst structure and the decrease of NO conversion efficiency.Recently, many researchers have been focused on tuning the structures of the catalysts to avoid the poison effect caused by SO 2 . The design of active components with the construction of a unique hollow structure presents the enhanced catalytic performance on NO oxidation with the existence of SO 2 . [3] The cavity confinement effect of the hollow nanoreactor could realize the impact on the unique electronic and geometric structure for enhancing the charge transfer and separation in the temporal-spatial catalytic process. [4] The charge transfer induced by the hetero-shelled hollow structure may change the catalytic activity and selectivity. [5] Besides, more interesting catalysts have been developed and applied to NO oxidation, such as composites structure control from one dimensional to three dimensional, [6,7] surface active site including defects engineering, [8,9] and catalytic sites tuning on synergetic conversion. [2,10] Non-thermal plasma(NTP) technology has attracted lots of research attention for NO catalytic removal. [11] The combination of NTP and catalyst can promote the formation of reaction intermediates on the catalyst surface, thus reducing the activation energy of the reaction, and achieving the rapid selective catalytic oxidation of NO at low temperatures. [12][13][14][15] In fact, many researchers attentions have been paid to tune the engineering parameters of the NTP and the advanced catalyst structure design without exploring the synergetic effect on the temporal-spatial structure, which may induce spatial charge rearrangement and trigger the micro-domain surficial species reaction. For instance, Cui et al. [16] studied the process of simultaneous oxidation of NO and SO 2 using non-thermal plasma coupled with catalyst on engineering parameters control. They found that the oxidation efficiency of both NO and SO 2 could be significantly improved in conjunction with further oxidation by the wet electrostatic precipitator (WESP). Furthermore, because of the unique properties of the hetero-shelled hollow structure catalyst, it may also be easier to produce synergistic Facilitating the mass transfer and spatial charge separation is a great challenge for achieving efficient oxidation of NO and outstanding sulfur resistance. Herein, a hydrothermal-assisted confinement growth technique is used to fabricate well-defined three-dimensional CuOx@MnOx hetero-shelled hollow-structure catalysts. By integrating the coupled plasma space reactor and the porous hierarchical structure of the catalyst, excellent stability (10 h) and high conversion of NO (93.86%) are reached under the concentration of SO 2 (1000 mg m -3 ) and NO (200 mg m -3 ). Impressively, precise surface characterization ...

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Section: Resultsmentioning

confidence: 92%

Hetero‐Shelled Hollow Structure Coupled with Non‐Thermal Plasma Inducing Spatial Charge Rearrangement for Superior NO Conversion and Sulfur Resistance

Liao

Zhao

Yang

et al. 2022

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“…O* mainly originates from the plasma discharge via O 3 decomposition, which reacts with water to release OH* species in the flue gas. Based on the results of numerous studies, − we speculate that the plasma-catalytic oxidation of NO and SO 2 by O* and OH* in collaboration with Co 3 O 4 /TiO 2 -3DHS mainly follows the Eley–Rideal (E–R) reaction mechanism. According to DFT calculations, the catalytic oxidation of NO occurs primarily on the surface of Co 3 O 4 /TiO 2 (004) and secondarily on the surface of Co 3 O 4 /TiO 2 (200).…”

Section: Resultsmentioning

confidence: 96%

“…The above understanding has been summarized into the reaction pathways in Figure . With reference to Figure , ,, we can describe the course of the reaction in general. During the oxidation of NO, most of the NO molecules can be adsorbed on the Co 3 site, and then O* attacks the NO molecules to form NO 2 molecules which can be desorbed from the catalyst surface.…”

Section: Resultsmentioning

confidence: 99%

Unique Cluster-Support Effect of a Co₃O₄/TiO₂-3DHS Nanoreactor for Efficient Plasma-Catalytic Oxidation Performance

et al. 2023

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For environmental catalysis, a central topic is the design of high-performance catalysts and advanced mechanism studies. In the case of the removal of flue gas pollutants from coal-fired power plants, highly selective nanoreactors have been widely utilized together with plasma discharge characteristics, such as the catalytic oxidation of NO. Herein, a novel reactor with a three-dimensional hollow structure of TiO 2 confining Co 3 O 4 nanoclusters (Co 3 O 4 /TiO 2 -3DHS) has been developed for plasma-catalytic oxidation of NO, whose performance was compared with that of the commercial TiO 2 confining Co 3 O 4 cluster (Co 3 O 4 /TiO 2 ). Specifically, Co 3 O 4 /TiO 2 -3DHS presented a higher efficiency (almost 100%) within lower peak−peak voltage (V P−P ). More importantly, the NO oxidation efficiency was between 91.5 and 94.5% after a long time of testing, indicating that Co 3 O 4 /TiO 2 -3DHS exhibits more robust sulfur and water tolerance. Density functional theory calculations revealed that such impressive performance originates from the unique cluster-support effect, which changes the distribution of the active sites on the catalyst surface, resulting in the selective adsorption of flue gas. This investigation provides a new strategy for constructing a three-dimensional hollow nanoreactor for the plasma-catalytic process.

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Microstructure Refinement and Strengthening–Toughening Mechanisms of Gray Cast Irons Reinforced by In Situ Nanosized TiB₂–TiC/Al Master Alloy

et al. 2021

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Herein, the effects of addition of TiB2–TiC nanoparticles on the microstructure and tensile properties of as‐cast gray cast irons are investigated. The in situ nanosized TiB2–TiC/Al master alloy is added in the casting process. It is found that the presence of TiB2–TiC nanoparticles refines the graphite flakes and pearlite and increases the yield strength, tensile strength, and fracture strain simultaneously. The strengthening mechanisms are related to grain refining strengthening and Orowan strengthening. The toughening mechanism is related to the scattering behavior of cracks by nanoparticles.

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Supervariate Ceramics: Gelatinous and Monolithic Ceramics Fabricated under Ambient Conditions

Cited by 8 publications

References 18 publications

Hetero‐Shelled Hollow Structure Coupled with Non‐Thermal Plasma Inducing Spatial Charge Rearrangement for Superior NO Conversion and Sulfur Resistance

Hetero‐Shelled Hollow Structure Coupled with Non‐Thermal Plasma Inducing Spatial Charge Rearrangement for Superior NO Conversion and Sulfur Resistance

Unique Cluster-Support Effect of a Co₃O₄/TiO₂-3DHS Nanoreactor for Efficient Plasma-Catalytic Oxidation Performance

Microstructure Refinement and Strengthening–Toughening Mechanisms of Gray Cast Irons Reinforced by In Situ Nanosized TiB₂–TiC/Al Master Alloy

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Supervariate Ceramics: Gelatinous and Monolithic Ceramics Fabricated under Ambient Conditions

Cited by 8 publications

References 18 publications

Hetero‐Shelled Hollow Structure Coupled with Non‐Thermal Plasma Inducing Spatial Charge Rearrangement for Superior NO Conversion and Sulfur Resistance

Hetero‐Shelled Hollow Structure Coupled with Non‐Thermal Plasma Inducing Spatial Charge Rearrangement for Superior NO Conversion and Sulfur Resistance

Unique Cluster-Support Effect of a Co3O4/TiO2-3DHS Nanoreactor for Efficient Plasma-Catalytic Oxidation Performance

Microstructure Refinement and Strengthening–Toughening Mechanisms of Gray Cast Irons Reinforced by In Situ Nanosized TiB2–TiC/Al Master Alloy

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Product

Resources

About

Unique Cluster-Support Effect of a Co₃O₄/TiO₂-3DHS Nanoreactor for Efficient Plasma-Catalytic Oxidation Performance

Microstructure Refinement and Strengthening–Toughening Mechanisms of Gray Cast Irons Reinforced by In Situ Nanosized TiB₂–TiC/Al Master Alloy