Adsorptive and catalytic properties of platinum microcrystals deposited on inert supports

Bagotzky, V.S.; Kanevsky, L.S.; Palanker, V.Sh.

doi:10.1016/0013-4686(73)80053-2

Cited by 44 publications

(4 citation statements)

References 18 publications

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“…This has proved to be a solution to the problem as it prevents the fast poisoning of the catalyst [1,[3][4][5][6][7][8][9][10]. Different mechanisms were suggested for the role of the added modifying element, namely (a) adsorption of the alcohol molecules on Pt and oxygen derivatives generated from the decomposition of water on the added element (for example Pb, Sn) [11][12][13], (b) "ligand effect" (electronic interaction of the added element with Pt which changes the adsorption energy of the adsorbate on Pt) [14], and (c) homogeneous catalytic reactions which was confirmed by the presence of complexed cations of the added element in the reaction media [12,15].…”

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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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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“…The probable explanation of this fact is the assumption of the competitive adsorption (in relation to Pt) of the reaction intermediate products (acting as ªpoisonº) on a polymer surface [24]. A similar hypothesis was formulated earlier [25] for the methanol electro-oxidation reaction on a vitreous carbon electrode with dispersed platinum on its surface. However, in the latter case the advantageous interaction of a support was significantly weaker than the action of the polymer matrix.…”

Section: Introductionmentioning

confidence: 89%

Electro‐Oxidation of Methanol and Ethanol on Poly(3,4‐Ethylenedioxythiophene) with Dispersed Pt, Pt + Sn, and Pt + Pb Particles

Białłozór¹,

Kupniewska²,

Jasulaitene³

2003

Fuel Cells

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The influence of tin and lead additives on the catalytic activity of platinum particles dispersed on a poly(3,4‐dioxyethylenethiophene) (PEDT) layer deposited on gold or steel towards anodic oxidation of methanol and ethanol was studied. It was found that these additives increase the rate of anodic oxidation of both alcohols. It was also found that the electro‐catalytic properties of PEDT depend on the kind of support used for its deposition. The authors have shown that these additives (Pb and Sn) increase the rate of anodic oxidation of both alcohols on platinum deposited on PEDT, but tin was evidently more effective than lead. In the presence of Sn, the steady‐state current density of methanol oxidation increases about 100 times, while Pb only promotes the platinum catalyst activity by about 2 times. In the authors opinion the most probable mechanism for the tin promotion effect seems to be a homogenous catalytic reaction with the participation of the Sn (IV) and Sn (II) ions as mediators.

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“…In fact the water can act as a 'vehicle' to transport ions through zeolite free volume space by hitching a ride on water. This phenomenon is called 'spillover' [14], mainly involving hydrogen and oxygen-containing species and has been observed on catalyst such as Pt/C [15], Pt/SiO 2 [16], Pt/Al 2 O 3 [17] and Pt/zeolite [18] in gas phase. Therefore, it is important to investigate H + spillover effect in zeolite -supported Pt Nafion @ bound Pt zeolite electrode system [7].…”

Section: Introductionmentioning

confidence: 99%

Proton Modified Pt Zeolite Fuel Cell Electrocatalysts

Yao

Mirzaii³

2015

Renewable Energy in the Service of Mankind Vol I

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NaY Zeolite has been selected as a suitable material to host 1.5 wt% Platinum (Pt) loading on zeolite using ion exchange methods of Pt(NH 3 ) 4 (NO 3 ) 2 without excess NH 4 NO 3 nitrate and Pt(NH 3 ) 4 (NO 3 ) 2 with excess NH 4 NO 3 nitrate. The structure/reactivity relationship of Pt nanoparticle was experimentally studied via Nafion @ bound electrodes to investigate the interaction nature of Pt with zeolite and electron transfer. By using extended X-ray adsorption fine structure technique, Pt particle size was predicted as 0.7 -1.5 nm. It was found Pt oxides can be electrochemically reduced via a hydrogen 'spillover' phenomenon. A highly dispersed small Pt particle distribution can be achieved with excessive H + ions on zeolite acidic sites.

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Adsorptive and catalytic properties of platinum microcrystals deposited on inert supports

Cited by 44 publications

References 18 publications

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

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

Electro‐Oxidation of Methanol and Ethanol on Poly(3,4‐Ethylenedioxythiophene) with Dispersed Pt, Pt + Sn, and Pt + Pb Particles

Proton Modified Pt Zeolite Fuel Cell Electrocatalysts

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