Research advances of rare earth catalysts for catalytic purification of vehicle exhausts − Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

Wang, Lanyi; Yu, Xin; Wei, Yuechang; Liu, Jian; Zhang, Zhao

doi:10.1016/j.jre.2021.05.001

Cited by 46 publications

(20 citation statements)

References 278 publications

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“…The electron hopping between Pr 3+ and Pr 4+ endows Pr 6 O 11 with high electronic conductivity [27,28] . Due to the shielding of 5 s electrons in the outer layer, 4 f electrons in Pr exhibit localization and incomplete filling, making it easier to change their valence states and possess unique redox capabilities [29,30] . Our previous work introduced Pr 6 O 11 as an efficient cathode catalyst for LOBs for the first time and found that regulating the temperature‐dependent oxygen vacancy (V O ) concentration could greatly affect its catalytic performance in the Li−O reactions.…”

Section: Introductionmentioning

confidence: 99%

“…[27,28] Due to the shielding of 5 s electrons in the outer layer, 4 f electrons in Pr exhibit localization and incomplete filling, making it easier to change their valence states and possess unique redox capabilities. [29,30] Our previous work introduced Pr 6 O 11 as an efficient cathode catalyst for LOBs for the first time and found that regulating the temperaturedependent oxygen vacancy (V O ) concentration could greatly affect its catalytic performance in the LiÀ O reactions. Although V O causes Pr 6 O 11 to deviate from its stoichiometric ratio, it does not destroy its cubic fluorite crystal structure; instead, it provides additional catalytic active sites, good conductivity, and fast reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Vacancies Riched PrO_x Polycrystalline Nanorods on Graphene Nanosheets as Advanced Oxygen Catalysts for Lithium‐Oxygen Batteries

Zhan,

Zhang,

et al. 2024

Batteries & Supercaps

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The slow reaction kinetics of Li−O is currently the most pressing technical obstacle to the development of lithium‐oxygen batteries. The Li2O2′s growth/decomposition pathways dominate the battery performance and can be optimized by exploring efficient cathode catalysts. Herein, we prepare regular, polycrystalline, oxygen vacancy (VO)‐riched PrOx uniformly anchored on few‐layered graphene (FLG) nanosheets to boost the Li−O reactions. XRD, TGA, XPS, SEM, TEM, SEAD, and electrochemical test techniques are used to study their chemical composition, microstructure, battery performance, and the effect of FLG on the formation of polycrystalline and VO. It is confirmed that FLG provides a large specific surface area and good electron transport. Moreover, it works as an anchoring substrate to transform PrOx from single crystal to polycrystalline, which is beneficial for exposing catalytic sites and VO and improving the battery performance. This unique composition and structure offer efficient active sites, accelerate electron transport, and regulate the Li2O2′s nucleation to form nanofilms or nanosheets on the catalyst. With this cathode catalyst, the battery achieved an ultralow total overpotential of 0.618 V, with a discharge capacity of 11489 mAh g−1 in the ultimate‐capacity mode and a superior cyclability of 85 cycles under the limited capacity of 500 mAh g−1.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxygen Vacancies Riched PrO_x Polycrystalline Nanorods on Graphene Nanosheets as Advanced Oxygen Catalysts for Lithium‐Oxygen Batteries

Zhan,

Zhang,

et al. 2024

Batteries & Supercaps

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“…As estimated by the World Health Organization, air pollution is causing ∼7% of the world’s deaths each year. The automotive industry accounts for the release of a major portion of toxic air pollutants, such as carbon monoxide (CO), soot particulates, and nitrogen oxides (NO x ). − Volatile organic compounds (VOCs), released from various stationary chemical industries and indoor sources, are also identified as toxic air pollutants because of their carcinogenic nature. − Thus, the purification of these air pollutants at ambient conditions is of utmost importance for a sustainable ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Review of Shape-Controlled CeO₂ Nanocatalysts for Purification of Auto-Exhaust Pollutants

Putla,

Kamali,

Swapna

et al. 2024

ACS Appl. Nano Mater.

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CeO2 (cerium dioxide or ceria) is a versatile material for industrial catalysis because of its reversible Ce4+/Ce3+ redox pair and tunable oxygen vacancies. Purification of air pollutants released from vehicles and stationary chemical industries is one of the imperative catalytic applications of CeO2. In this regard, significant efforts have been made to improve the properties of CeO2 by precisely controlling its’ particle shape. This fascinating shape-controlled strategy can stabilize the surface-enriched crystal facets with excellent redox properties, abundant surface oxygen vacancies, enhanced active-site accessibility, and high catalytic activities. The synergistic effect of doping and deposition of transition metals in improving the structure–activity properties of shape-controlled ceria is also unraveled for air pollution control. Thus, this review aims to summarize and elucidate the advances in the field of catalytic air pollution control using shape-controlled ceria-based nanomaterials. The adverse effects of four types of air pollutants, namely carbon monoxide, soot particulates, nitrogen oxides, and volatile organic compounds, while emphasizing the drawbacks and challenges associated with the current technologies were briefly provided. The role of various doped metals (Zr, Ti, Mn, Co, Fe, Ni, etc.) and deposited metals (Au, Pt, Pd, Ru, Ag, Cu, Mn, etc.) associated with the well-defined morphologies (rods, cubes, tubes, polyhedra, spheres, fibers, etc.) of ceria for air pollution control was meticulously discussed. We hope that this timely important review can provide promising strategies for the rational design of advanced ceria-based catalysts not only for air pollution control but also for important energy-related applications.

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“…Ammonia (NH 3 ) is a colorless gas with a strong, pungent odor, contributing to acid rain, photochemical smog, and environmental problems. It also harms the human respiratory system, causing severe irritation to the skin and eyes. − Among existing NH 3 removal techniques, ammonia selective catalytic oxidation (NH 3 -SCO) stands out as the most practical for its low cost and mild operation conditions. ,,, So far, various types of catalysts for NH 3 -SCO have been developed, including noble metals ( e.g. , Pt, Au, and Ru), − modified zeolites ( e.g.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Lattice O Assisted Internal Selective Catalytic Reduction Mechanism on High N₂ Selectivity of CuO_x/PtCu Catalysts in NH₃-SCO

Liu

Wang

et al. 2023

ACS Catal.

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Supported Pt catalysts suffer from low reaction selectivity (<65% at 100% conversion) in the selective catalytic oxidation of ammonia (NH 3 -SCO) because of their intrinsic over-oxidation tendencies. Herein, a strategy based on facilitating byproduct NO x reduction to N 2 is demonstrated at CuO x /PtCu catalysts, aiming to tackle the low selectivity challenge. This PtCu alloy sample with a CuO x -rich surface displays an N 2 selectivity of 95%, while its turnover frequencies are the highest among reported supported Ptbased catalysts. The enhanced reaction activities and N 2 selectivities are primarily attributed to the Pt-Cu δ+ dual-site synergies at the CuO x /PtCu interface, in which dual sites exhibit distinct NH 3 adsorption, activation, and dehydrogenation behaviors. The O lat assisted internal selective catalytic reduction mechanism at CuO x /PtCu with N 2 O 2 2− as the central intermediates is proposed. Density functional theory calculation and temperature-programmed surface reaction measurements show that the N−O bond in N 2 O 2 2− tends to break simultaneously with the assistance of O v in CuO x followed by the easy transition from N 2 O 2 2− to N 2 , which serve as the origin of the high selectivity.

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Research advances of rare earth catalysts for catalytic purification of vehicle exhausts − Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

Cited by 46 publications

References 278 publications

Oxygen Vacancies Riched PrO_x Polycrystalline Nanorods on Graphene Nanosheets as Advanced Oxygen Catalysts for Lithium‐Oxygen Batteries

Oxygen Vacancies Riched PrO_x Polycrystalline Nanorods on Graphene Nanosheets as Advanced Oxygen Catalysts for Lithium‐Oxygen Batteries

Review of Shape-Controlled CeO₂ Nanocatalysts for Purification of Auto-Exhaust Pollutants

Unraveling the Lattice O Assisted Internal Selective Catalytic Reduction Mechanism on High N₂ Selectivity of CuO_x/PtCu Catalysts in NH₃-SCO

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Research advances of rare earth catalysts for catalytic purification of vehicle exhausts − Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

Cited by 46 publications

References 278 publications

Oxygen Vacancies Riched PrOx Polycrystalline Nanorods on Graphene Nanosheets as Advanced Oxygen Catalysts for Lithium‐Oxygen Batteries

Oxygen Vacancies Riched PrOx Polycrystalline Nanorods on Graphene Nanosheets as Advanced Oxygen Catalysts for Lithium‐Oxygen Batteries

Review of Shape-Controlled CeO2 Nanocatalysts for Purification of Auto-Exhaust Pollutants

Unraveling the Lattice O Assisted Internal Selective Catalytic Reduction Mechanism on High N2 Selectivity of CuOx/PtCu Catalysts in NH3-SCO

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Oxygen Vacancies Riched PrO_x Polycrystalline Nanorods on Graphene Nanosheets as Advanced Oxygen Catalysts for Lithium‐Oxygen Batteries

Oxygen Vacancies Riched PrO_x Polycrystalline Nanorods on Graphene Nanosheets as Advanced Oxygen Catalysts for Lithium‐Oxygen Batteries

Review of Shape-Controlled CeO₂ Nanocatalysts for Purification of Auto-Exhaust Pollutants

Unraveling the Lattice O Assisted Internal Selective Catalytic Reduction Mechanism on High N₂ Selectivity of CuO_x/PtCu Catalysts in NH₃-SCO