A mild and environmentally benign strategy towards hierarchical CeO<sub>2</sub>/Au nanoparticle assemblies with crystal facet-enhanced catalytic effects for benzyl alcohol aerobic oxidation

Gong, Xia; Liu, Baocang; Zhang, Geng; Xu, Guangran; Zhao, Tiebiao; Shi, Dichao; Wang, Qin; Zhang, Jun

doi:10.1039/c5ce02472b

Cited by 14 publications

(12 citation statements)

References 49 publications

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“…A promising research avenue is the exploration of structure (e.g., crystal planes) and morphology (e.g., CeO 2 nanoparticle assemblies, nano-CeO 2 ) of the CeO 2 support, which on the one hand provide powerful restrictions over size and distribution, resulting in uniform metal nanoparticles immobilized on the internal or external surface of CeO 2 , and on the other hand, turn surface intrinsic chemical property (higher Ce 3+ species, more oxygen vacancies), resulting in significantly improved catalytic behavior. The synergetic effects between ceria crystal plane and gold on the catalytic activity of oxidative dehydrogenation of alcohols to aldehydes or ketones in the liquid phase have been investigated by Wang et al using CeO 2 nanorods (CeO 2 -R), nanocubes (CeO 2 -C), and nanooctahedra (CeO 2 -O) as supports for Au nanoparticles .…”

Section: Ceria-based Catalysts For Selective Oxidation Via Thermocata...mentioning

confidence: 99%

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

et al. 2021

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Value-added chemicals, fuels, and pharmaceuticals synthesized by organic transformation from raw materials via catalytic techniques have attracted enormous attention in the past few decades. Heterogeneous catalysts with high stability, long cycling life, good environmental-friendliness, and economic efficiency are greatly desired to accomplish the catalytic organic transformations. With the advantages of reversible Ce3+/Ce4+ redox pairs, tailorable oxygen vacancies, and surface acid–base properties, ceria-based catalysts have been actively investigated in the fields of catalytic organic synthesis. In this Review, we summarize the fundamentals and latest applications of ceria-based heterogeneous catalysts for organic transformations via thermocatalytic and photocatalytic routes. The fabricating approaches of various ceria and ceria-based catalysts and their structure/composition–activity relationship are discussed and prospected. The advanced characterization techniques and theoretical methods for reaction mechanism studies over CeO2-based catalysts are summarized and discussed. This comprehensive Review provides a basic understanding of the structure–performance relationships of ceria-based catalysts for organic synthesis. In addition, it also provides some insights and outlooks in the design and research direction in the ceria-based catalysts with better performance.

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Section: Ceria-based Catalysts For Selective Oxidation Via Thermocata...mentioning

confidence: 99%

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

et al. 2021

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“…The improved activity and recycling performance were consistent with the H 2 -TPR test that hollow structure with more surface oxygen species demonstrated enhanced catalytic properties shown as larger peak area in the low temperature zone. [155] Guo and his co-workers prepared well-dispersed CeO 2 hollow nanospheres with high surface areas by developing a facile one-step solvothermal method with the assistance of hydrochloric acid. The as-prepared Zr-doped CeO 2 NTs possess high surface areas and large cavities.…”

Section: Catalytic Redox Reactionsmentioning

confidence: 99%

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Wang

2018

Advanced Materials

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Hollow micro/nanostructured CeO2‐based materials (HMNCMs) have triggered intensive attention as a result of their unique structural traits, which arise from their hollowness and the fascinating physicochemical properties of CeO2. This attention has led to widespread applications with improved performance. Herein, a comprehensive overview of methodologies applied for the synthesis of various hollow structures, such as hollow spheres, nanotubes, nanoboxes, and multishelled hollow spheres, is provided. The synthetic strategies toward CeO2 hollow structures are classified into three major categories: 1) well‐established template‐assisted (hard‐, soft‐, and in situ template) methods; 2) newly emerging self‐template approaches, including selective etching, Ostwald ripening, the Kirkendall effect, galvanic replacement, etc.; 3) bottom‐up self‐organized formation synthesis (namely, oriented attachment and self‐deformation). Their underlying mechanisms are concisely described and discussed in detail, the differences and similarities of which are compared transversely and longitudinally. Niche applications of HMNCMs in a wide range of fields including catalysis, energy conversion and storage, sensors, absorbents, photoluminescence, and biomedicines are reviewed. Finally, an outlook of future opportunities and challenges in the synthesis and application of CeO2‐based hollow structures is also presented.

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“…The loss of XRD signal intensity is probably due to the incorporation of the Ce 3+ species inside the resin network. The XRD pattern of Ce‐Amb‐Air (treated under oxidative atmosphere) showed narrow lines corresponding to diffraction on ceria CeO 2 planes (111), (200), (220), (311), (222), (400) and (331) crystallizing in a fluorite‐like face‐centered cubic structure (ICDD#034‐0394) of the space group Fm‐3 m (225) (where (225): is Hermann Maugin notation) as cited in literature [24,25] . The presence of CeO 2 oxide in Ce‐Amb‐Air could be explained by oxidation of Ce 3+ ions (introduced during sample preparation) by oxygen present in air during treatment.…”

Section: Resultsmentioning

confidence: 84%

“…[nm] [a] Crystallites size for Au [nm] [a] Ce-Amb-Air ChemistrySelect fluorite-like face-centered cubic structure (ICDD#034-0394) of the space group Fm-3 m (225) (where (225): is Hermann Maugin notation) as cited in literature. [24,25] The presence of CeO 2 oxide in Ce-Amb-Air could be explained by oxidation of Ce 3 + ions (introduced during sample preparation) by oxygen present in air during treatment.…”

Section: Samplesmentioning

confidence: 99%

Photocatalytic Easy Recovery of Orthophosphates Contaminants in Water Using Amberlite‐732 Cationic‐Resin Exchanged by Ce³⁺and Ce³⁺‐Au³⁺ Species

et al. 2022

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This report discusses the efficiency of photo‐recovery of orthophosphate anions in water under visible irradiation using materials containing amorphous carbon, ceria and gold‐ceria species. Catalysts were obtained by the exchange of Amberlite‐732 polymeric‐resin with isolated Ce(III) and co‐mixing of Ce(III)‐Au(III) cations. Syntheses were developed for molar ratios Ce(III)/3H+=100 and Au(III)‐Ce(III)/3H+=0.01. Solids were treated at 800 °C under Air or Ar atmosphere then characterized by: X‐ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy coupled to energy‐dispersive X‐ray spectroscopy (EDS), X‐ray photoemission spectroscopy (XPS) and UV‐visible spectroscopy. By XRD, non‐stoichiometric Ce2.658S4 sulfide and particles of metallic gold are identified in Ce‐Au‐Amb‐Ar and in the case of Ce‐Au‐Amb‐Air, mixture of CeO2 and Au0 is clearly observed. Moreover, XPS study of Ce3d emission spectra showed well resolved electronic states of the spin‐orbit Ce3d5/2 and Ce3d3/2 levels in the Ce4+ and Ce3+ oxidation states confirming coexistence of Ce(IV)/Ce(III). On the surfaces of both Ce‐Au‐Amb‐Air and Ce‐Au‐Amb‐Ar, XPS revealed metallic Au species. A certain amount of carbon, identified by EDS and XPS, corresponds to poorly ordered carbon formed by the resin decomposition during thermal treatments under Air and Ar. The UV‐vis spectroscopy was valuable to quantify the remaining PO43− anions in solution (at each moment of reaction) using “Molybdenum Blue” method. Photo‐recovery of orthophosphates under visible irradiation yields optimal trapping of ∼75 % of PO43− on Ce‐Au‐Amb‐Ar, attributed to a catalyst surface enrichment with Ce3+ species, which promoted structural oxygen vacancies.

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A mild and environmentally benign strategy towards hierarchical CeO₂/Au nanoparticle assemblies with crystal facet-enhanced catalytic effects for benzyl alcohol aerobic oxidation

Cited by 14 publications

References 49 publications

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Photocatalytic Easy Recovery of Orthophosphates Contaminants in Water Using Amberlite‐732 Cationic‐Resin Exchanged by Ce³⁺and Ce³⁺‐Au³⁺ Species

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A mild and environmentally benign strategy towards hierarchical CeO2/Au nanoparticle assemblies with crystal facet-enhanced catalytic effects for benzyl alcohol aerobic oxidation

Cited by 14 publications

References 49 publications

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

Photocatalytic Easy Recovery of Orthophosphates Contaminants in Water Using Amberlite‐732 Cationic‐Resin Exchanged by Ce3+and Ce3+‐Au3+ Species

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A mild and environmentally benign strategy towards hierarchical CeO₂/Au nanoparticle assemblies with crystal facet-enhanced catalytic effects for benzyl alcohol aerobic oxidation

Photocatalytic Easy Recovery of Orthophosphates Contaminants in Water Using Amberlite‐732 Cationic‐Resin Exchanged by Ce³⁺and Ce³⁺‐Au³⁺ Species