Au–Pd Core–Shell Nanoparticles as Alcohol Oxidation Catalysts: Effect of Shape and Composition

Cheong, Soshan; Graham, Leah; Brett, Gemma Louise; Henning, Anna M.; Watt, John; Miedziak, Peter J.; Song, Minghui; Takeda, Yoshihiko; Taylor, Stuart Hamilton; Tilley, Richard D.

doi:10.1002/cssc.201300483

Cited by 24 publications

(20 citation statements)

References 74 publications

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“…However, the major challenge for the application of solvent-free liquid oxidation in industry relies in the development of highly active and selective catalyst systems. Supported noble metal NPs, such as Au [3][4][5], Pd [6,7] and bimetallic catalysts (Au-Pd) [8][9][10][11][12] have been extensively studied for selective oxidation of alcohols [13]. Among them, gold (Au) and palladium (Pd) bimetallic catalyst was the most frequently reported for alcohol oxidation; a synergistic effect between these two metals was observed [8,9,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Formation of PdO on Au–Pd bimetallic catalysts and the effect on benzyl alcohol oxidation

Cao

Zhao

et al. 2019

Journal of Catalysis

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A series of catalysts containing of gold-palladium bimetallic nanoparticles (Au-Pd NPs in the range of 1-6 nm) anchored on foam-like mesoporous silica were used for the aerobic oxidation of benzyl alcohol. A remarkable synergistic effect was observed on these Au-Pd NPs catalysts prepared by one-pot method. Both the experimental and theoretical study revealed a close relationship between the surface PdO species on the catalysts and their catalytic performance, that is, a higher surface PdO content leads to a lower catalytic activity. The surface content of PdO species on the catalysts could be tuned by controlling the Au/Pd ratios, because the formation of Au-Pd alloy NPs and electron transfer between surface Au and Pd atoms prevented the oxidation of surface Pd and retarded the formation of PdO species. An optimal Au/Pd ratio of 1/4.5 on the foam-like mesoporous silica support was obtained, with nearly no surface PdO species formed and resulted the highest benzyl alcohol conversion of 96%.The bimetallic Au-Pd catalysts exhibited much higher catalytic activity for benzyl alcohol oxidation (TOF = 50000 -60000 h -1 ) than the monometallic Pd catalyst (TOF = 12500 h -1 ) on which surface Pd is easily oxidized to PdO. These results provide direct evidence for the synergistic effect of the Au-Pd bimetallic catalyst in benzyl alcohol oxidation.

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Section: Introductionmentioning

confidence: 99%

Formation of PdO on Au–Pd bimetallic catalysts and the effect on benzyl alcohol oxidation

Cao

Zhao

et al. 2019

Journal of Catalysis

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“…Being a large‐quantity byproduct from the industrial production of biodiesel and fatty acids,, glycerol (GLY) shows a great potential to be converted into many high value‐added chemicals and intermediates, such as dihydroxyacetone, glyceraldehyde (GALD), glycolic acid (GA), tartronic acid (TA), and glyceric acid (GLA) via the selective oxidation reaction . In conventional heterogeneous catalytic processes, GLY oxidation is carried out using stoichiometric oxidants, such as permanganate, nitric acid or chromic acid.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Conversion of Glycerol into Value‐Added Chemicals by Selective Electro‐Oxidation on Pt‐Based Catalysts

2018

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Electro‐oxidation of glycerol affords a totally green route to produce high value‐added chemicals. Herein, we report a study on glycerol electro‐oxidation over a series of graphene nanosheet supported Pt (Pt/GNS), PtNi (PtNi/GNS), PtRu (PtRu/GNS), PtRh (PtRh/GNS), PtRuNi (PtRuNi/GNS), and PtRhNi (PtRhNi/GNS) catalysts in alkaline solution. The activity of the catalysts was evaluated by cyclic voltammetry, linear sweep voltammetry, and chronoamperometric measurements. The PtRh/GNS and PtRhNi/GNS catalysts exhibited superior activity in terms of higher current densities and lower onset potentials. The products of glycerol oxidation formed at potentials of −0.4, −0.1, and 0.2 V, were systematically analyzed by high performance liquid chromatography (HPLC). Five compounds as products from glycerol electro‐oxidation catalyzed by the prepared materials were found, including glyceraldehyde, glycolic acid, tartronic acid, glyceric acid and oxalate acid. The product distribution at the different potentials was investigated for all catalysts. A maximum glycolic acid selectivity of 65.4 % was obtained for the Pt/GNS catalyst at 0.2 V while a maximum glyceric acid selectivity of 47.7 % was achieved using the PtNi/GNS catalyst at −0.1 V. It was found that the introduction of Ru facilitated the formation of C3 products while the addition of Rh was beneficial for the formation of C2 products. Based on HPLC results, the pathways of glycerol electro‐oxidation by the prepared catalysts were proposed.

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“…For example, Pd NPs are catalysts for Heck and Suzuki reactions [7] and can be used to detect oxygen [8] and formaldehyde [9]. A synergy between Au NPs and Pd NPs is found in core-shell Au-Pd NPs [10], which exhibit catalytic activity toward various reactions, such as oxidation of CO, alcohols, and phenols [11][12][13]. Pt NPs have antioxidant activities.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Metal Nanoparticles by Microorganisms

Kato

Suzuki

2020

SSRN Journal

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Metal nanoparticles (NPs), with sizes ranging from 1-100 nm, are of great scientific interest because their functions and features differ greatly from those of bulk metal. Chemical or physical methods are used to synthesize commercial quantities of NPs, and green, energy-efficient approaches generating byproducts of low toxicity are desirable to minimize the environmental impact of the industrial methods. Some microorganisms synthesize metal NPs for detoxification and metabolic reasons at room temperature and pressure in aqueous solution. Metal NPs have been prepared via green methods by incubating microorganisms or cell-free extracts of microorganisms with dissolved metal ions for hours or days. Metal NPs are analyzed using various techniques, such as ultraviolet-visible spectroscopy, electron microscopy, X-ray diffraction, electron diffraction, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Numerous publications have focused on microorganisms that synthesize various metal NPs. For example

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Au–Pd Core–Shell Nanoparticles as Alcohol Oxidation Catalysts: Effect of Shape and Composition

Cited by 24 publications

References 74 publications

Formation of PdO on Au–Pd bimetallic catalysts and the effect on benzyl alcohol oxidation

Formation of PdO on Au–Pd bimetallic catalysts and the effect on benzyl alcohol oxidation

Sustainable Conversion of Glycerol into Value‐Added Chemicals by Selective Electro‐Oxidation on Pt‐Based Catalysts

Synthesis of Metal Nanoparticles by Microorganisms

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