Direct Observation of Hydrogen Spillover on Carbon-Supported Platinum and Its Influence on the Hydrogenation of Benzene

Srinivas, Seethamraju; Rao, P. Kanta

doi:10.1006/jcat.1994.1233

Cited by 152 publications

(107 citation statements)

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“…Results from both Ni and Pt nanoparticles directly dispersed on high surface area carbons were used as the metal receptor sites for hydrogen dissociation. Platinized carbon was the standard system studied in the discovery of the spillover phenomenon 52 , the benzene hydrogenation experiments that later confirmed the spillover mechanism 53 , and in the first reports of spillover enhancement to hydrogen storage capacity.Error! Bookmark not defined.…”

Section: Metal Modified Carbonsmentioning

confidence: 42%

“…It was proposed that an enhancement of the hydrogen storage capacities of physisorptive materials can be gained by hydrogen spillover from a metal catalyst onto the adsorbing surface. 46,47 ,48 ,49 ,50 ,51 Hydrogen spillover is dissociative chemisorption of dihydrogen onto a metal particle followed by migration of hydrogen atoms onto the surface of the bulk material and subsequent diffusion away from the receptor site 52,53,54 as shown in Figure 21.…”

Section: Metal Modified Carbonsmentioning

confidence: 48%

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Enhanced Hydrogen Dipole Physisorption, Final Report

Ahn

2014

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literature 9 . The surface excess can be depicted schematically as shown in Figure 4. Near the adsorbent surface, in the region labeled "adsorbed layer", the local adsorptive density is considerably higher than in the bulk gas phase. It is assumed that at a suitably large distance from the adsorbent surface, the adsorptive density decays back to a constant bulk density (bulk). This region is labeled as the "bulk gas". Important quantities for the adsorption model are defined in Table 1.The standard practice is to express adsorption as a Gibbs surface excess quantity. This is the amount of adsorptive which is present in the adsorbed layer in excess of the bulk gas density, indicated in Figure 4 by the dark gray region. Conveniently, the surface excess amount is the quantity which is measured in a standard volumetric measurement. The expression for the Gibbs surface excess amount is therefore Equation 3The surface excess amount n_is an extensive quantity. Typically, however, data are presented as a specific surface excess amount Equation 4where ms is the sorbent mass. 9 S. Sircar, Gibbsian surface excess for gas adsorption-revisited, Ind Eng Chem Res 38 (10), 3670-3682 (1999).

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Section: Metal Modified Carbonsmentioning

confidence: 42%

Section: Metal Modified Carbonsmentioning

confidence: 48%

Enhanced Hydrogen Dipole Physisorption, Final Report

Ahn

2014

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“…The hydrogen 'spillover' pathway on Pt/C catalyst was investigated by Srinivas and Rao [25]. They found the adsorption/desorption can occur on carbon based Pt active sites.…”

Section: The Cyclic Voltammetry (Cv) Measurementsupporting

confidence: 40%

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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“…The influence of hydrogen spillover on the hydrogenation of benzene has been reported in a number of articles [39][40][41][42][43]. Moreover, some researchers have concluded that the concentration of oxygen atoms (or hydroxyl groups) on the support surface affects the rate of hydrogen spillover [44][45][46].…”

Section: Correlation Between Hydrogenation Activity and Smsi Effectsupporting

confidence: 40%

Naphthalene hydrogenation over Pt/TiO2–ZrO2 and the behavior of strong metal–support interaction (SMSI)

Lu¹,

Lin²,

Wang³

2000

Applied Catalysis A: General

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Vapor-phase naphthalene hydrogenation over various supported Pt catalysts was studied in a continuous fixed-bed microreactor. Experimental results indicated that the catalytic activity of the catalyst strongly depended on the nature of the support and the pre-reduction temperature. Reaction order was independent of the support as the reaction was pseudo-first-order with respect to naphthalene in the temperature range studied. By comparing the apparent rate constant over various supported Pt catalysts, Pt supported on TiO 2 -ZrO 2 (1 : 1) reduced at a low temperature showed the highest activity. For higher pre-reduction temperatures, Pt/TiO 2 -ZrO 2 (1 : 1) exhibited the least suppression of H 2 uptake, due to a stabilization effect exerted by ZrO 2 , which prevents the migration of TiO x moieties and the blockage of the Pt surface. However, the apparent depression of the hydrogenation activity of high-temperature reduced Pt/TiO 2 -ZrO 2 (1 : 1) was significantly greater than the suppression of its hydrogen uptake. Furthermore, the decreasing value of the hydrogenation activity relative to the hydrogen uptake demonstrates electron perturbations between the support and the Pt metal.

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Direct Observation of Hydrogen Spillover on Carbon-Supported Platinum and Its Influence on the Hydrogenation of Benzene

Cited by 152 publications

References 0 publications

Enhanced Hydrogen Dipole Physisorption, Final Report

Enhanced Hydrogen Dipole Physisorption, Final Report

Proton Modified Pt Zeolite Fuel Cell Electrocatalysts

Naphthalene hydrogenation over Pt/TiO2–ZrO2 and the behavior of strong metal–support interaction (SMSI)

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