Effect of doping elements on oxygen vacancies and lattice oxygen in CeO2CuO catalysts

Zhang, Lu; Chen, Tianjia; Zeng, Shanghong; Su, Haiquan

doi:10.1016/j.jece.2016.05.023

Cited by 45 publications

(19 citation statements)

References 51 publications

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“…As shown in Figure 20, close relationships between the half-conversion temperature (T 50 ) and the main Raman peak shift or the concentration of Ce 3+ and oxygen vacancies were observed [278]. The doping effect on the CO-PROX performance has also been studied in the inverse copperceria catalysts [276,277]. It was reported that doping ceria with transition metals (e.g., Fe, Co, Ni) induces changes in the ceria lattice and in the formation of oxygen vacancies [276].…”

Section: Preferential Oxidation Of Co (Co-prox)mentioning

confidence: 79%

Section: Preferential Oxidation Of Co (Co-prox)mentioning

confidence: 99%

“…The doping effect on the CO-PROX performance has also been studied in the inverse copper-ceria catalysts [276,277]. It was reported that doping ceria with transition metals (e.g., Fe, Co, Ni) induces changes in the ceria lattice and in the formation of oxygen vacancies [276]. The doping element affects the reducibility of the CeO 2 /CuO x catalysts, while promoting the formation of Ce 3+ ions and oxygen vacancies, with the NiO-doped CeO 2 /CuO x catalyst exhibiting the highest activity (T 50 = 68 • C) and the widest temperature window for total CO conversion (115-155 • C) [276].…”

Section: Preferential Oxidation Of Co (Co-prox)mentioning

confidence: 99%

“…It was reported that doping ceria with transition metals (e.g., Fe, Co, Ni) induces changes in the ceria lattice and in the formation of oxygen vacancies [276]. The doping element affects the reducibility of the CeO 2 /CuO x catalysts, while promoting the formation of Ce 3+ ions and oxygen vacancies, with the NiO-doped CeO 2 /CuO x catalyst exhibiting the highest activity (T 50 = 68 • C) and the widest temperature window for total CO conversion (115-155 • C) [276]. In the inverse copper-ceria catalysts, it has also been found that the presence of Zn improves the CO-PROX performance, as it has the ability to hinder the CuO reduction to highly reduced copper sites which provide the active sites for the H 2 oxidation [277].…”

Section: Preferential Oxidation Of Co (Co-prox)mentioning

confidence: 99%

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Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Konsolakis

Lykaki

2020

Catalysts

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Catalysis is an indispensable part of our society, massively involved in numerous energy and environmental applications. Although, noble metals (NMs)-based catalysts are routinely employed in catalysis, their limited resources and high cost hinder the widespread practical application. In this regard, the development of NMs-free metal oxides (MOs) with improved catalytic activity, selectivity and durability is currently one of the main research pillars in the area of heterogeneous catalysis. The present review, involving our recent efforts in the field, aims to provide the latest advances—mainly in the last 10 years—on the rational design of MOs, i.e., the general optimization framework followed to fine-tune non-precious metal oxide sites and their surrounding environment by means of appropriate synthetic and promotional/modification routes, exemplified by CuOx/CeO2 binary system. The fine-tuning of size, shape and electronic/chemical state (e.g., through advanced synthetic routes, special pretreatment protocols, alkali promotion, chemical/structural modification by reduced graphene oxide (rGO)) can exert a profound influence not only to the reactivity of metal sites in its own right, but also to metal-support interfacial activity, offering highly active and stable materials for real-life energy and environmental applications. The main implications of size-, shape- and electronic/chemical-adjustment on the catalytic performance of CuOx/CeO2 binary system during some of the most relevant applications in heterogeneous catalysis, such as CO oxidation, N2O decomposition, preferential oxidation of CO (CO-PROX), water gas shift reaction (WGSR), and CO2 hydrogenation to value-added products, are thoroughly discussed. It is clearly revealed that the rational design and tailoring of NMs-free metal oxides can lead to extremely active composites, with comparable or even superior reactivity than that of NMs-based catalysts. The obtained conclusions could provide rationales and design principles towards the development of cost-effective, highly active NMs-free MOs, paving also the way for the decrease of noble metals content in NMs-based catalysts.

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Section: Preferential Oxidation Of Co (Co-prox)mentioning

confidence: 79%

Section: Preferential Oxidation Of Co (Co-prox)mentioning

confidence: 99%

Section: Preferential Oxidation Of Co (Co-prox)mentioning

confidence: 99%

Section: Preferential Oxidation Of Co (Co-prox)mentioning

confidence: 99%

See 2 more Smart Citations

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Konsolakis

Lykaki

2020

Catalysts

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“…Based on the abovementioned peak-tting measurements, a literature method was applied to estimate the relative concentrations (C) of Ce(III) by the calculated peak area of Ce species according to the following equations: [30][31][32][33]…”

Section: Resultsmentioning

confidence: 99%

Modulating Cu⁺ distribution on the surface of Ce-doped CuO composite oxides for SO₂-resistant NH₃-selective catalytic reduction of NO

et al. 2017

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A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

et al. 2018

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Copper oxide nanoparticles were dispersed onto the surface of ceria nanorods, while a post‐synthesis modification was applied to the reference sample using ammonia solutions. The modified catalysts were characterized with a variety of analytical techniques, providing useful information on the effect of the Cu:NH3 ratio, employed in the modification step, on the physicochemical properties. Re‐dispersion of the active copper species under extremely basic conditions promoted the reducibility and the oxygen mobility of the catalyst, thus resulting in a more active and selective catalyst for preferential CO oxidation.

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Effect of doping elements on oxygen vacancies and lattice oxygen in CeO2CuO catalysts

Cited by 45 publications

References 51 publications

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Modulating Cu⁺ distribution on the surface of Ce-doped CuO composite oxides for SO₂-resistant NH₃-selective catalytic reduction of NO

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

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Effect of doping elements on oxygen vacancies and lattice oxygen in CeO2CuO catalysts

Cited by 45 publications

References 51 publications

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

Modulating Cu+ distribution on the surface of Ce-doped CuO composite oxides for SO2-resistant NH3-selective catalytic reduction of NO

A Novel Post‐Synthesis Modification of CuO‐CeO2 Catalysts: Effect on Their Activity for Selective CO Oxidation

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Modulating Cu⁺ distribution on the surface of Ce-doped CuO composite oxides for SO₂-resistant NH₃-selective catalytic reduction of NO

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation