Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation

Liu, Jiaxin; Qiao, Botao; Song, Yian; Tang, Huazhong; Huang, Yudong; Liu, Jingyue

doi:10.1016/j.jechem.2016.03.010

Cited by 24 publications

(28 citation statements)

References 70 publications

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“…Therefore, Au/ZnO-NW with relatively weaker interactions between Au and ZnO-NW displayed higher stability at high pretreatment temperature. In addition, Liu et al further explored the catalyst stability [138]. After calcination at 600 °C, the CO oxidation rate decreased about 30-times on Au/ZnO (powder) but only about 4-times on Au/ZnO (nanowires).…”

Section: Co Oxidationmentioning

confidence: 99%

“…It is mainly because of the higher stability of ZnO-NW that prohibits the sintering of Au particles and then displays higher stability at high pretreatment temperature [137,138] Au-ZnO Nanorods The formation of Au-O-Zn linkage or Au-Zn alloy was caused by different SMSI due to different pretreatment conditions. [139] Au-ZnO Nanorods The SMSI leading to a unique structure of a number of gold nanocrystals epitaxial oriented on the ZnO nanorod [140] Au-ZnO Twin-brush…”

Section: Co Oxidationmentioning

confidence: 99%

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The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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Zinc oxide (ZnO), with the unique chemical and physical properties of high chemical stability, broad radiation absorption range, high electrochemical coupling coefficient, and high photo-stability, is an attractive multifunctional material which has promoted great interest in many fields. What is more, its properties can be tuned by controllable synthesized morphologies. Therefore, after the success of the abundant morphology controllable synthesis, both the morphology-dependent ZnO properties and their related applications have been extensively investigated. This review concentrates on the properties of morphology-dependent ZnO and their applications in catalysis, mainly involved reactions on green energy and environmental issues, such as CO 2 hydrogenation to fuels, methanol steam reforming to generate H 2 , bio-diesel production, pollutant photo-degradation, etc. The impressive catalytic properties of ZnO are associated with morphology tuned specific microstructures, defects or abilities of electron transportation, etc. The main morphology-dependent promotion mechanisms are discussed and summarized.

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Section: Co Oxidationmentioning

confidence: 99%

Section: Co Oxidationmentioning

confidence: 99%

The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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“…Comparatively, noble metal catalysts were water tolerant, which obtained extensive attention since the discovery of nanometer Au catalyst by Haruta et al in 1987 . This catalyst exhibited an unexpectedly high performance in CO oxidation even at cryogenic temperatures and quickly became the best known benchmark system in CO oxidation . Although this reaction on Pt catalysts has been studied for almost a century since Langmuir's work, the Pt group metal (PGM) catalysts were less concerned probably due to the general one order of magnitude less active than Au catalysts .…”

Section: Introductionmentioning

confidence: 99%

“…benchmark system in CO oxidation. 13,14 Although this reaction on Pt catalysts has been studied for almost a century since Langmuir's work, 15 the Pt group metal (PGM) catalysts were less concerned probably due to the general one order of magnitude less active than Au catalysts. 16,17 The key lies in that the CO molecule is strongly adsorbed on PGM sites, which would prohibit the adsorption and activation of O 2 .…”

Section: Introductionmentioning

confidence: 99%

More active Ir subnanometer clusters than single‐atoms for catalytic oxidation of CO at low temperature

et al. 2017

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This work reported the adsorption and reaction performance of FeOx supported subnanometer cluster and single‐atom Ir catalysts for the oxidation of CO at low temperature. By varying the pretreatment temperature and Ir loading, the single‐atom and subnanometer cluster Ir catalysts were obtained. The Ir subnanometer clusters exhibited higher activity for the oxidation of CO with or without the presence of H2 than the single‐atom counterpart. By using adsorption microcalorimetry and in situ infrared spectroscopy measurements, it was found that the Ir subnanometer clusters not only promoted the adsorption and reaction of CO and O2 but also facilitated the formation of OH species from reaction between H2 and O2, thus opening a new reaction pathway between CO and OH species to produce CO2 compared with that between CO and O species on the single‐atom counterpart. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4003–4012, 2017

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“…CO oxidation is one of the most common and simple prototypical reactions for heterogeneous process, and is also of practical imporatnce for the removal of trace amounts of CO in fuel cell applications [113][114][115][116]. Recently, some studies using graphitized nanocarbon-supported metal catalysts for CO oxidation have attempted to obtain highly dispersed metal NPs on supports and to understand the interactions between NPs and graphitized nanocarbon.…”

Section: Oxidation Reactionsmentioning

confidence: 99%

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

Huang

2017

Sci. China Mater.

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Graphitized nanocarbon materials can be an ideal catalyst support for heterogeneous catalytic systems. Their unique physical and chemical properties, such as large surface area, high adsorption capacity, excellent thermal and mechanical stability, outstanding electronic properties, and tunable porosity, allow the anchoring and dispersion of the active metals. Therefore, currently they are used as the key support material in many catalytic processes. This review summarizes recent relevant applications in supported catalysts that use graphitized nanocarbon as supports for catalytic oxidation, hydrogenation, dehydrogenation, and C-C coupling reactions in liquid-phase and gas-solid phase-reaction systems. The latest developments in specific features derived from the morphology and characteristics of graphitized nanocarbon-supported metal catalysts are highlighted, as well as the differences in the catalytic behavior of graphitized nanocarbon-supported metal catalysts versus other related catalysts. The scientific challenges and opportunities in this field are also discussed. Keywords: nanocarbon materials; graphitized carbon supports; metal catalysts; hetergeneous catalysis INTRODUCTIONCarbon combines its atoms in diverse hybridization states (sp, sp 2 , sp 3 ) to form a variety of polymorphs. These are composed entirely of carbon but have different physical structures and different names, including diamond, graphite, fullerenes, and carbines, among others [1][2][3][4][5]. Because these various and versatile allotropes produce materials with a large range of properties, carbon materials can be used in a number of technological processes, including high-tech catalytic ones [6][7][8][9][10].In heterogeneous catalysis, carbon material plays wellestablished and important roles in a wide range of applications, both as catalyst in its own right and as a unique support material [11][12][13][14][15]. The chemical stability of carbon supports in some specifically aqueous phase biomass conversion surpasses that of metal oxide materials; in addition, carbon materials present other common and key advantages as support materials for catalysis [1,5]. From the point of physical structure, porous carbon can be prepared in different forms (granules, cloth, fibers, pallets, etc.). Due to its chemical properties, carbon structure is resistant to both acidic and basic media. The structure of carbon is stable at high temperature (even above 1023 K under inert atmosphere). The hydrophilic/ hydrophobic nature of carbon can be easily modified. Active metals on the support can be easily reduced. For the purposes of industrial economy and environment, the active phase can be easily recovered. Conventional carbon supports are lower-cost and more easily available than other conventional supports. Although several kinds of carbon materials have been studied, active carbon (AC) [12,[16][17][18][19] and, to a lesser extend, carbon black [20][21][22][23] have long been the most commonly used carbon supports. AC is an amorphous solid prepa...

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Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation

Cited by 24 publications

References 70 publications

The Applications of Morphology Controlled ZnO in Catalysis

The Applications of Morphology Controlled ZnO in Catalysis

More active Ir subnanometer clusters than single‐atoms for catalytic oxidation of CO at low temperature

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

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