Tailoring the surface structures of iron oxide nanorods to support Au nanoparticles for CO oxidation

Gao, Tongtong; Zhang, Liyun; Ma, Yanshuang; Liu, Zhao‐Tie; Zhang, Bingsen

doi:10.1016/s1872-2067(19)63374-7

Cited by 15 publications

(8 citation statements)

References 55 publications

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“…Comparatively, when concentrating on the size effect of iron oxide dispersed as small clusters or Fe 1 (OH) x , the Ir–Fe 1 (OH) x interfaces render an enhanced activity at higher temperatures (60–180 °C) . These advances tell us that the modulation of specific Fe species, which not only provide the Fe 2+ sites for O 2 adsorption but also affect the property of metal sites for CO or H 2 activation, ,− could markedly affect the work temperature window for the CO-PROX reaction.…”

Section: Introductionmentioning

confidence: 99%

Widening Temperature Window for CO Preferential Oxidation in H₂ by Ir Nanoparticles Interaction with Framework Fe of Hexaaluminate

et al. 2021

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It is important to develop an efficient noble-metal-based catalyst that has a wide work temperature window and good stability for CO preferential oxidation in H 2 (CO-PROX), a key step to purify industrial hydrogen resource. Herein, a catalyst of Fe-substituted hexaaluminatesupported Ir nanoparticles with a mean size of ∼1.4 nm (Ir/BaFeAl 11 O 19 ) is synthesized. It can exhibit total CO conversion for the CO-PROX reaction in an unprecedented temperature range from 20 to 200 °C, high stability, and good resistance to CO 2 and H 2 O in a simulated practical atmosphere. Detailed characterizations coupled with density functional theory (DFT) calculations show that the interaction between Ir species and framework Fe cations in mirror planes of hexaaluminate promotes the formation of a certain amount (8%) of Fe 2+ species for low-temperature CO oxidation, while the Ir species interacting with these Fe 2+ provide moderate CO bond strength that is critical to maintaining the preferential oxidation of CO rather than H 2 at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Widening Temperature Window for CO Preferential Oxidation in H₂ by Ir Nanoparticles Interaction with Framework Fe of Hexaaluminate

et al. 2021

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“…CO oxidation is one of the most extensively investigated reactions in heterogeneous catalysis, ,− which not only plays an important role in practical applications, such as CO gas sensors , and automotive exhaust emission control, but also often used as an ideal probe reaction to unravel the reaction mechanism. , In recent years, lots of studies have been carried out on the metal oxide supported noble metal NPs for the CO oxidation reaction, , in which most of the catalysts are highly active for low-temperature CO oxidation, but they suffer from low thermal stability. , The CO oxidation reaction is an exothermic reaction, which inevitably leads to the catalyst sintering and accelerating the catalyst deactivation during long time operation. Thus, it is still challenging to prepare a CO oxidation catalyst with high activity and stability.…”

Section: Introductionmentioning

confidence: 99%

Sinter Resistance and Activity Enhancement via a Facet-Dependent Metal–Support Interaction of Pd/ZnO Catalysts in CO Oxidation

Niu

Wang

et al. 2021

J. Phys. Chem. C

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Metal−support interaction (MSI) has been extensively investigated regarding its structural and catalytic modification in heterogeneous catalysts. Herein, we reveal how facet-dependent MSI impacts on the structure and performance of Pd/ZnO in the CO oxidation reaction. ZnO nanosheets with orthohexagonal shape which are exposed mainly with {001} facets exhibit remarkable thermal stability under air atmosphere until 600 °C, while ZnO nanorods bounded with {100} facets transform at 400 °C and totally change after calcination at 600 °C. Thus, the Pd species supported on ZnO nanorods and nanosheets also display different sintering behaviors after thermal treatment, and the particle size of Pd grows from 1.1 to 5.7 nm on {100} facets while it keeps high-dispersion on {001} facets after 600 °C calcination. In situ transmission electron microscopy was used to visualize the sintering process, demonstrating that Pd displays the Ostwald ripening and particle migration coalescence mechanism on ZnO {100} facets, while shows extraordinary stability on ZnO {001} facets. Therefore, Pd supported on ZnO nanorod exhibits deactivation behavior after high temperature treatment in CO oxidation, during which the T 50 delays from 106 to 120 and 145 °C after 200, 400, and 600 °C calcination. Interestingly, Pd on ZnO nanosheet shows obvious activity enhancement from 137 to 90 and 75 °C of T 50 after the same treatment, which is ascribed to the synergy between Pd and ZnO {001} facets during catalysis. This work gives indepth understanding of the facet-dependent MSI of Pd/ZnO catalysts, and it sheds light on the rational design of heterogeneous catalysts with high efficiency and sinter resistance.

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“…The hypothesis of one of these oxides formation seems consistent with the brick red/orange sample aqueous solution at 40°C for 10 minutes [20] . By drawing a parallel with Shi et al study [21] , where the calcination at different temperatures of FeOOH is investigated, we may suspect that FeOOH and Fe 2 O 3 could coexist on the ZnO surface. Moreover, Achouri et al assumed that ZnO acts as a support able to absorb FeCl 3 at its surface until its conversion into iron oxide (Fe 2 O 3 ) through heating and annealing at 100°C [22] .…”

Section: Characterisationmentioning

confidence: 92%

Improving natural sunlight photocatalytic efficiency of ZnO nanowires decorated by iron oxide cocatalyst via a simple drop method

Pivert

Suo²,

Tang³

et al. 2022

Materials Chemistry and Physics

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Tailoring the surface structures of iron oxide nanorods to support Au nanoparticles for CO oxidation

Cited by 15 publications

References 55 publications

Widening Temperature Window for CO Preferential Oxidation in H₂ by Ir Nanoparticles Interaction with Framework Fe of Hexaaluminate

Widening Temperature Window for CO Preferential Oxidation in H₂ by Ir Nanoparticles Interaction with Framework Fe of Hexaaluminate

Sinter Resistance and Activity Enhancement via a Facet-Dependent Metal–Support Interaction of Pd/ZnO Catalysts in CO Oxidation

Improving natural sunlight photocatalytic efficiency of ZnO nanowires decorated by iron oxide cocatalyst via a simple drop method

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Tailoring the surface structures of iron oxide nanorods to support Au nanoparticles for CO oxidation

Cited by 15 publications

References 55 publications

Widening Temperature Window for CO Preferential Oxidation in H2 by Ir Nanoparticles Interaction with Framework Fe of Hexaaluminate

Widening Temperature Window for CO Preferential Oxidation in H2 by Ir Nanoparticles Interaction with Framework Fe of Hexaaluminate

Sinter Resistance and Activity Enhancement via a Facet-Dependent Metal–Support Interaction of Pd/ZnO Catalysts in CO Oxidation

Improving natural sunlight photocatalytic efficiency of ZnO nanowires decorated by iron oxide cocatalyst via a simple drop method

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Widening Temperature Window for CO Preferential Oxidation in H₂ by Ir Nanoparticles Interaction with Framework Fe of Hexaaluminate

Widening Temperature Window for CO Preferential Oxidation in H₂ by Ir Nanoparticles Interaction with Framework Fe of Hexaaluminate