Preparation of Pd/Pt Bimetallic Nanoparticles in Water/AOT/Isooctane Microemulsions

Wu, Ming; Chen, Dong-Hwang; Huang, Tian

doi:10.1006/jcis.2001.7887

Cited by 87 publications

(71 citation statements)

References 42 publications

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“…Pt-Pd nanoparticles (∆ε 0 = 0.15 V) at various molar ratios have been prepared by co-reduction with hydrazine in different microemulsions [84][85][86]. The resultant nanoparticles were characterized by TEM, XRD, EDX, and XPS.…”

Section: Bimetallic Nanoparticles Obtained From Microemulsions Using mentioning

confidence: 99%

“…The resultant nanoparticles were characterized by TEM, XRD, EDX, and XPS. The nanoparticles had a homogeneous alloy structure at molar ratio 1:1, and only an enrichment of Pt on particle surface was observed at a 9:1 molar ratio Pd-Pt [84]. Yashima et al [86] studied the catalytic activity for CO oxidation.…”

Section: Bimetallic Nanoparticles Obtained From Microemulsions Using mentioning

confidence: 99%

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On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

2017

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A comparative study on different bimetallic nanocatalysts prepared from microemulsions using a one-pot method has been carried out. The analysis of experimental observations, complemented by simulation studies, provides detailed insight into the factors affecting nanoparticle architecture: (1) The metal segregation in a bimetallic nanocatalysts is the result of the combination of three main kinetic parameters: the reduction rate of metal precursors (related to reduction standard potentials), the material intermicellar exchange rate (determined by microemulsion composition), and the metal precursors concentration; (2) A minimum difference between the reduction standard potentials of the two metals of 0.20 V is needed to obtain a core-shell structure. For values ∆ε 0 smaller than 0.20 V the obtaining of alloys cannot be avoided, neither by changing the microemulsion nor by increasing metal concentration; (3) As a rule, the higher the film flexibility around the micelles, the higher the degree of mixture in the nanocatalyst; (4) A minimum concentration of metal precursors is required to get a core-shell structure. This minimum concentration depends on the microemulsion flexibility and on the difference in reduction rates.

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Section: Bimetallic Nanoparticles Obtained From Microemulsions Using mentioning

confidence: 99%

Section: Bimetallic Nanoparticles Obtained From Microemulsions Using mentioning

confidence: 99%

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

2017

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“…Although w/o-microemulsions have been widely used to synthesize monometallic nanoparticles, the synthesis of intermetallic nanoparticles via w/o microemulsions is still a challenge and has been successful only in the case of metals with similar reduction potentials (e.g. Pt/Ag [31], Pt/Au [32], Pt/Pd [33]). The synthesis of intermetallic nanoparticles of metals with largely different reduction potentials has not yet been achieved.…”

Section: Introductionmentioning

confidence: 99%

Phase diagrams of microemulsions containing reducing agents and metal salts as bases for the synthesis of metallic nanoparticles

Najjar

2009

Journal of Colloid and Interface Science

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We studied the phase diagrams of microemulsions with a view to using these systems for the synthesis of metallic Pt, Pb, and Bi nanoparticles as well as of intermetallic Pt/Pb and Pt/Bi nanoparticles. The microemulsions consisted of H 2 O/salt -n-decane -SDS -1-butanol. The salt was either one metal precursor (H 2 PtCl 6 ·6H 2 O, Pb(NO 3 ) 2 , or Bi(NO 3 ) 3 ·5H 2 O), a mixture of two metal precursors (H 2 PtCl 6 ·6H 2 O + Pb(NO 3 ) 2 or H 2 PtCl 6 ·6H 2 O + Bi(NO 3 ) 3 ·5H 2 O), or the reducing agent (NaBH 4 ). In addition, other salts needed to be added in order to solubilize the metal precursors, to stabilize the reducing agent, and to adjust the ionic strength. Combining the microemulsion (µe1) that contains the metal precursor(s) with the microemulsion (µe2) that contains the reducing agent leads to metallic nanoparticles. To study systematically how the shape and size of the synthesized metallic nanoparticles depend on the size and shape of the respective microemulsion droplets, first of all one has to find those conditions under which µe1 and µe2 have the same structure. For that purpose we determined the water emulsification failure boundary (wefb) of each microemulsion as it is at the wefb where the water droplets are known to be spherical. We found that the ionic strength (I) of the aqueous phase as well as the hard acid and hard base properties of the ions are the key tuning parameters for the location of the wefb.

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“…Structural and electronic characteristics depend intimately on the preparation procedure itself [25] and on the different parameters of the procedure such as the calcination temperature [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Structure and Size of Bimetallic Palladium-Platinum Clusters in an Hydrotreatment

Bazin

Denis²,

Pichon

et al. 2005

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Structure et taille de particules bimétalliques palladium -platine dans un catalyseur d'hydrotraitement -Des catalyseurs bimétalliques PdPt supportés sur alumine ont été synthétisés par imprégnation à sec de bis acétylacétonate. Les formulations Pt 4 Pd/Al 2 O 3 and Pt 6 Pd/Al 2 O 3 dédiées à l'hydrogénation des aromatiques et à la désulfuration, ont été caractérisées par spectroscopie d'absorption X, microscopie électronique à transmission, et titrage H 2 -O 2 . Il a été montré que les métaux étaient associés dans des structures de type coeur-coquille avec un enrichissement préférentiel de la surface des particules en Pd. De plus, la composition optimale pour la réaction d'hydrogénation des aromatiques en pré-sence de soufre est dépendante de la taille des particules. Abstract

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Preparation of Pd/Pt Bimetallic Nanoparticles in Water/AOT/Isooctane Microemulsions

Cited by 87 publications

References 42 publications

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions

Phase diagrams of microemulsions containing reducing agents and metal salts as bases for the synthesis of metallic nanoparticles

Structure and Size of Bimetallic Palladium-Platinum Clusters in an Hydrotreatment

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