Study on the CO Oxidation over Ceria-Based Nanocatalysts

Piumetti, Marco; Andana, Tahrizi; Bensaid, Samir; Russo, Nunzio; Fino, Debora; Pirone, Raffaele

doi:10.1186/s11671-016-1375-z

Cited by 60 publications

(36 citation statements)

References 44 publications

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“…The peaks located at around 882.8, 888.1, and 898.4 eV are assigned to the Ce 3 d 5/2 , and those at around 901.3, 907.0, and 916.7 eV are assigned to the Ce 3 d 3/2 , corresponding to spin-orbit split doublets of Ce (IV) compounds. The observed results are matched with reported literatures generally [19, 28, 29, 32]. It is obvious that the samples are in the state of Ce 4+ without any impurity of the Ce 3+ state.…”

Section: Resultssupporting

confidence: 91%

“…Combined with H 2 -TPR and XPS experiments, it suggested that CO oxidation over LaO x -doped CeO 2 -supported Au catalysts might follow the Langmuir–Hinshelwood + Redox mechanism [1, 20, 26, 30, 32]. The XPS results suggest that there are Ce 3+ and Ce 4+ on the surface of the catalyst.…”

Section: Resultsmentioning

confidence: 92%

“…6c) is asymmetric and deconvoluted into 529.3, 531.6, and 527.6 eV, respectively. The peak at 529.3 eV is assigned to lattice oxygen and that at around 531.9 eV is assigned to hydroxyl groups on the surface of the support [27, 28, 32]. The small shoulder peak at 527.6 eV is attributed to La-O, which could also reveal the presence of LaO x in the catalysts [11, 48].…”

Section: Resultsmentioning

confidence: 99%

“…For pure CeO 2 nanorods, the reduction peak centered at about low temperature (410 °C) and high temperature (620 °C) could be attributed to the reduction of surface and bulk oxygen species of CeO 2 , respectively [1, 32]. For pure La nanorods, obvious reduction peaks could be detected at ~ 700 °C assigned to the reduction of bulk La 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

“…CeO 2 has an excellent oxygen storage and release capacity due to the ability to switch Ce 4+ /Ce 3+ , which makes CeO 2 become an active oxide component of various oxidation catalysts used in diverse redox catalytic reactions [17–32]. Surface areas, mesoporous structures, lattice defects, and synergistic effects with other dopants can all promote the catalytic properties of ceria nanomaterials [3, 22].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Zhong

Zhu

et al. 2017

Nanoscale Res Lett

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One-dimensional (1D) Ce-La nanorods with different La contents (Ce and La in the molar ratio of 1:0, 3:1, 1:1, 1:3, and 0:1) were synthesized by hydrothermal process. Au/Ce-La nanorod catalysts were obtained by a modified deposition-precipitation method. The samples were characterized by N2 adsorption-desorption (BET), ICP, X-ray diffraction (XRD), SEM, TEM, EDX, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and temperature-programmed reduction (H2-TPR). It revealed that La existed as LaOx in the 1D nanorods. The catalysis results demonstrated that the mixed binary Ce-La nanorod oxides could be a good support for gold catalysts. The contents of La had an important influence on the catalytic performance of Au/Ce-La nanorod catalysts. Among the catalysts, when the Ce/La molar ratio was 3:1, the 1.0%Au/Ce0.75-La0.25 nanorods pretreated at 300 °C showed the best activity among the catalysts for CO oxidation, which could convert CO completely at 30 °C. The catalysts also performed high temperature resistance and good stability for CO oxidation at the reaction temperatures of 40, 70, and 200 °C.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Zhong

Zhu

et al. 2017

Nanoscale Res Lett

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Tuning the C₁/C₂ Selectivity of Electrochemical CO₂ Reduction on Cu–CeO₂ Nanorods by Oxidation State Control

et al. 2022

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drawing attention as a promising technology to mitigate excess anthropogenic CO 2 emissions because it can convert carbon dioxide into high-value-added chemicals and fuels in an eco-friendly and economical way. [2] Among suitable metals, Cu (and its compounds) is the only one capable of producing high value-added C 2+ products, such as C 2 H 4 and C 2 H 5 OH, with high selectivity through CO dimerization. [3] However, the C 2+ selectivity of Cu-based electrocatalysts can be further improved by tailoring the active sites of Cu through doping, [4] tuning the catalyst particle shapes and sizes, [5] and increasing the number of low coordination sites, for example, the grain boundary density. [6] In particular, the use of mixed oxidation states (i.e., Cu + and Cu 0 ) has been suggested as an effective means to achieve high C 2+ product selectivity by lowering the energy barrier for CO dimerization. [7] However, Cu + is not stable and is easily converted to metallic Cu (Cu 0 ) at the negative applied potentials used for the CO 2 RR. As a result, many strategies have been developed to sustain the mixed oxidation state of Cu during the CO 2 RR. [8] For instance, doping Cu with B atoms can induce the formation of Cu + under CO 2 RR conditions, and increase its stability. [4a,9] Nevertheless, it is still challenging to achieve controllable Cu + coverage at the catalytically active Cu top-surface.Ceria (CeO 2 ) is a reducible metal oxide and an excellent support for metal catalysts in many catalytic processes, such as the water-gas shift reaction, [10] CO oxidation, [11] and CO 2 hydrogenation reaction. [12] As a catalyst support, CeO 2 can disperse metals at various scales uniformly, from the nanometre in scale to single atoms. [13] In addition, CeO 2 forms strong metal-support interactions (SMSIs) with the active metals, which allows the formation of a partially charged metal at the metal-CeO 2 interface. [14] These unique characteristics of CeO 2 can also promote the electrocatalytic CO 2 RR activity of metals such as Au and Cu supported on CeO 2 . In particular, Cu on ceria (Cu-CeO 2 ) shows wide tunability in CO 2 RR product selectivity, and this is dependent on the sizes and compositions of Cu-CeO 2 . For example, CeO 2 can stabilize a single-atom (SA) Cu in the Cu 2+ valence state and generate CH 4 with a faradaic efficiency (FE) of Ceria (CeO 2 ) is one of the most extensively used rare earth oxides. Recently, it has been used as a support material for metal catalysts for electrochemical energy conversion. However, to date, the nature of metal/CeO 2 interfaces and their impact on electrochemical processes remains unclear. Here, a Cu-CeO 2 nanorod electrochemical CO 2 reduction catalyst is presented. Using operando analysis and computational techniques, it is found that, on the application of a reductive electrochemical potential, Cu undergoes an abrupt change in solubility in the ceria matrix converting from less stable randomly dissolved single atomic Cu 2+ ions to (Cu 0 ,Cu 1+ ) nanoclusters. Unlike single ...

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Ceria‐based nanomaterials as catalysts for CO oxidation and soot combustion: Effect of Zr‐Pr doping and structural properties on the catalytic activity

et al. 2016

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In this work, we investigated a set of ceria‐based catalysts prepared by the hydrothermal and solution combustion synthesis. For the first time to our knowledge, we synthesized nanocubes of ceria doped with zirconium and praseodymium. The catalysts were tested for the CO and soot oxidation reactions. These materials exhibited different surface reducibility, as measured by H2‐TPR, CO‐TPR and Soot‐TPR, despite their comparable chemical compositions. As a whole, Soot‐TPR appears a suitable characterization technique for the soot oxidation catalysts, whereas CO‐TPR technique allows to better discriminate among the CO oxidation activities. Praseodymium contributes positively toward the soot oxidation. On the other hand, it has an adverse effect on the CO oxidation over the same catalysts, as compared to pure ceria. The incorporation of zirconium into the ceria lattice does not have a direct beneficial effect on the soot oxidation activity, although it increases the catalyst performances for CO oxidation. © 2016 American Institute of Chemical Engineers AIChE J, 63: 216–225, 2017

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Study on the CO Oxidation over Ceria-Based Nanocatalysts

Cited by 60 publications

References 44 publications

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Tuning the C₁/C₂ Selectivity of Electrochemical CO₂ Reduction on Cu–CeO₂ Nanorods by Oxidation State Control

Ceria‐based nanomaterials as catalysts for CO oxidation and soot combustion: Effect of Zr‐Pr doping and structural properties on the catalytic activity

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Study on the CO Oxidation over Ceria-Based Nanocatalysts

Cited by 60 publications

References 44 publications

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Tuning the C1/C2 Selectivity of Electrochemical CO2 Reduction on Cu–CeO2 Nanorods by Oxidation State Control

Ceria‐based nanomaterials as catalysts for CO oxidation and soot combustion: Effect of Zr‐Pr doping and structural properties on the catalytic activity

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Tuning the C₁/C₂ Selectivity of Electrochemical CO₂ Reduction on Cu–CeO₂ Nanorods by Oxidation State Control