Fabrication of homogeneously Cu2+/La3+-doped CeO2nanosheets and their application in CO oxidation

Zhou, Xia; Ling, Jun; Sun, Wen‐Hua

doi:10.1039/c7ta00924k

Cited by 44 publications

(41 citation statements)

References 45 publications

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“…The E vf of single TM‐doped CeO 2 had a wide distribution ranging from −1.49 eV (Cu) to +2.01 eV (Os). Cu‐doped CeO 2 has the lowest E vf among the single TM‐doped CeO 2 , which is consistent with the results of previous reports ,,,…”

Section: Resultssupporting

confidence: 93%

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

et al. 2019

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We present a highly active CeO 2 -based catalyst for oxidizing CO in automobile exhaust. This catalyst was systemically designed by co-doping with transition metals (TMs). First, we used density functional theory (DFT) calculations to screen Mn and 13 dopant TMs (periods 4~6 in groups VIII~XI) and their 91 binary combinations for co-doping. As a result, Cu and (Cu, Ag) were found to be the best candidates among the single and binary dopants, respectively. Next, we synthesized CeO 2 nano-particles doped with Cu or (Cu, Ag), then experimentally confirmed that the predicted (Cu, Ag) co-doped CeO 2 showed higher activity than pure CeO 2 and other TM-doped CeO 2 . This was attributed to the easy formation of oxygen vacancies in the lattice of CeO 2 . Our study demonstrates that the use of a rational design of CeO 2 -based catalyst through theoretical calculations and experimental validation can effectively improve the low-temperature catalytic activity of CO oxidation.

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Section: Resultssupporting

confidence: 93%

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

et al. 2019

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“…The smaller Pd domain resulted in higher levels of Pd−O−Ce, with higher catalytic activity than the catalyst using the same amount of precious metal . Among strategies for enhanced catalytic activity using small amounts of inexpensive active metals, the doping system has been proven in many studies . Mai et al.…”

Section: Improving Co Oxidation By Enhancing the Intrinsic Activity Omentioning

confidence: 99%

“…Those catalysts were synthesized with the same specific surface area, clearly explaining the intrinsic effects of the RE dopant. Most studies, however, usually did not control the specific surface area during the synthesis of RDC catalysts . Thus, it was hard to distinguish whether the improved activity originated from intrinsic or extrinsic effects of RE dopants.…”

Section: Improving Co Oxidation By Enhancing the Intrinsic Activity Omentioning

confidence: 99%

“…[25] Among strategies for enhanced catalytic activity using small amounts of inexpensive active metals, the doping system has been proven in many studies. [26,[28][29][30] Mai et al designed a superior catalyst by substituting a Cu species into the CeO 2 lattice. The redox properties of CeO 2 catalysts have been further enhanced by Cu species, and yielded higher density of oxygen vacancies and CO chemisorption sites.…”

Section: Improving Co Oxidation By Enhancing the Intrinsic Activity Omentioning

confidence: 99%

“…[67] area during the synthesis of RDC catalysts. [28,[57][58] Thus, it was hard to distinguish whether the improved activity originated from intrinsic or extrinsic effects of RE dopants. In this sense, a clear understanding of the effect of increased specific surface area of RDC, apart from the intrinsic effect of RE dopants, is undoubtedly critical for the rational design of RDC catalysts.…”

Section: Increase In Chemisorption Sites On Catalyst Surface By Re Domentioning

confidence: 99%

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Design of Ceria Catalysts for Low‐Temperature CO Oxidation

et al. 2019

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A catalyst active to carbon monoxide (CO) oxidation at low temperature is essential for environmental conservation, saving fuel and improvement of the quality of human life. Rational design of CO oxidation catalyst on the basis of comprehensive understanding of physicochemical properties of catalytic materials, rather than simply searching for the catalyst based on trial‐and‐error, is a promising approach to meet the increasingly stringent regulations. This review covers metal‐doped and ‐loaded system based on CeO2 catalysts as strategies to significantly improve CO oxidation activity at low temperature. When incorporated into CeO2 lattice, active metals significantly lower the oxygen vacancy formation energy (Evf) of the catalyst surface, resulting in high catalytic activities at low temperature. When the active metals are loaded on the CeO2 surface, many active sites could be acquired by increasing the dispersion, and the catalytic activity can be dramatically improved by newly introducing the interfacial sites between the metals and the CeO2 support. Doping the support could further improve this loaded system in terms of specific surface area, oxygen vacancy formation, and spillover effects. In this review, based on this knowledge, we propose a rational design approach to a robust low‐temperature CO oxidation catalysts. The desirable CO oxidation catalysts identified from the interplay between theoretical and experimental approaches would ultimately improve the quality of human life, and create potential economic benefits by alleviating air pollution.

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Design and Synthesis of Sm, Y, La and Nd‐doped CeO₂ with a broom‐like hierarchical structure: a photocatalyst with enhanced oxidation performance

Yang

Zhang

et al. 2020

ChemCatChem

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CeO 2 doped with various rare earth (RE) ions (Sm, Y, La and Nd) having a broom-like hierarchical structure was successfully prepared by a template-free hydrothermal method. The photooxidation performance of RE-doped products was significantly better than that of pure CeO 2 , and comparative experiments showed that Sm-doped CeO 2 (SC) has superior photooxidation activity, resulting about 3.0-times and 8.5-times higher activities of bisphenol A (BPA) degradation and of acetaldehyde (CH 3 CHO) decomposition, respectively, than those of pure CeO 2 . Due to the incorporation of RE ions, the surface exposed cerium ions are partly substituted by those cations, resulting in a higher concentration of oxygen vacancies (O v ) in RE-doped CeO 2 . The increased O v can act as a trapping center for photogenerated electrons to form a doping transition state between the conduction band (CB) and valence band (VB), which can restrict the recombination rate of electrons and holes effectively and lead to an outstanding enhancement of photooxidation performance. Furthermore, abundant highly reactive hydroxyl radicals ( * OH) and superoxide radicals ( * O 2 À ), which are efficient intermediates with vivid oxidation ability, can further enhance the photocatalytic activity of RE-doped CeO 2 . A cost-effective strategy for designing CeO 2 -based semiconductor photocatalysts doped with multitudinous RE ions that have enhanced photooxidation performance is presented in this paper.[a] Assoc.

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Fabrication of homogeneously Cu²⁺/La³⁺-doped CeO₂nanosheets and their application in CO oxidation

Abstract: Nanosheets of coordination polymers (CPs) were synthesizedviaa facile and one-step complexing-coprecipitation (CC) method.

Cited by 44 publications

References 45 publications

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

Design of Ceria Catalysts for Low‐Temperature CO Oxidation

Design and Synthesis of Sm, Y, La and Nd‐doped CeO₂ with a broom‐like hierarchical structure: a photocatalyst with enhanced oxidation performance

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Fabrication of homogeneously Cu2+/La3+-doped CeO2nanosheets and their application in CO oxidation

Abstract: Nanosheets of coordination polymers (CPs) were synthesizedviaa facile and one-step complexing-coprecipitation (CC) method.

Cited by 44 publications

References 45 publications

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation

Design of Ceria Catalysts for Low‐Temperature CO Oxidation

Design and Synthesis of Sm, Y, La and Nd‐doped CeO2 with a broom‐like hierarchical structure: a photocatalyst with enhanced oxidation performance

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Fabrication of homogeneously Cu²⁺/La³⁺-doped CeO₂nanosheets and their application in CO oxidation

Design and Synthesis of Sm, Y, La and Nd‐doped CeO₂ with a broom‐like hierarchical structure: a photocatalyst with enhanced oxidation performance