Comparison of Metal-Support Interactions in Pt/TiO2 and Pt/CeO2

Datye, Abhaya K.; Kalakkad, D. S.; Yao, Minghui; Smith, David J.

doi:10.1006/jcat.1995.1196

Cited by 154 publications

(86 citation statements)

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“…In addition to the clusters some individual Pt atoms are present. With this study the presence of a Ti-O overlayer could not be verified as has been observed by others [17].…”

Section: Pt On Silica and Titaniacontrasting

confidence: 56%

Behavior of Pt Atoms on Oxide Supports During Reduction Treatments at Elevated Temperatures, Characterized by Aberration Corrected Stem Imaging

et al. 2011

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Aberration-corrected scanning transmission electron microscopy at the sub-Å ngström resolution allows imaging the structure of catalytic materials at the single atom level and permits fundamental studies of the behavior of heavy metal catalytic species as a result of elevated temperature gas-treatments. The present study is aimed at understanding the development of clusters and nanoparticles of Pt on c-alumina during reduction treatments of a pre-oxidized highly dispersed catalyst. A special built ex situ reactor and a specimen holder allowing cyclic anaerobic transfer between the reactor and microscope were used for the study. The number of atoms in a nascent cluster can be determined along with the general shape of the cluster. Reduction experiments without air exposure of the sample showed that although clusters are formed at 500°C, many Pt atoms are not associated with the cluster and are still dispersed on the catalyst support. After a 700°C reduction, all of the Pt atoms are associated with the clusters. Movement of the clusters on the catalyst support is different depending upon the catalyst support.

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“…In addition to the clusters some individual Pt atoms are present. With this study the presence of a Ti-O overlayer could not be verified as has been observed by others [17].…”

Section: Pt On Silica and Titaniacontrasting

confidence: 56%

Behavior of Pt Atoms on Oxide Supports During Reduction Treatments at Elevated Temperatures, Characterized by Aberration Corrected Stem Imaging

et al. 2011

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“…It is well known that partially reduced TiO 2 (TiO x ) decorates metal surface when TiO 2 supported metal catalysts are reduced at high temperatures. In the cases of Pt/TiO 2 , the decoration of TiO x preferentially occurs over Pt crystallite terrace sites where bridge-type adsorbed CO is formed [40,41]. This would be the reason of the disappearance of bridge-type adsorbed CO by the high temperature reduction.…”

Section: Influence Of Pt Loading and Catalyst Reduction Temperaturementioning

confidence: 99%

Selective hydrogenation of nitrostyrene to aminostyrene over Pt/TiO2 catalysts: Effects of pressurized carbon dioxide and catalyst preparation conditions

Fujita

Yoshida

Asai

et al. 2011

The Journal of Supercritical Fluids

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The present work has studied the influence of CO 2 pressurization on the hydrogenation of nitrostyrene (NS) using Pt/TiO 2 . With CO 2 pressurization up to 12 MPa (CO 2 -dissolved expanded liquid (CXL) phase), the over-all reaction rate and the selectivity to aminostyrene (AS) increased. At higher CO 2 pressures where all NB dissolved in scCO 2 (scCO 2 -homogeneous phase), both of them decreased with increasing the CO 2 pressure. The phase behavior was an important factor for the present reaction system. It was also found that the presence of pressurized CO 2 gave higher selectivity to AS than in its absence at any conversion level. This was ascribed to retardation effects of dense phase CO 2 on the hydrogenation of AS to ethylaniline. Competitive adsorption of nitro and vinyl groups was suggested to determine the product selectivity. FTIR measurements showed that the pressurized CO 2 lowers the reactivity of the nitro group, and this effect is stronger in scCO 2 -homogeneous phase than in CXL phase, resulting in the lower AS selectivity in the former phase. Lower Pt loadings and higher catalyst reduction temperatures gave Pt/TiO 2 catalysts more selective for the AS formation. FTIR measurements of adsorbed CO over the catalysts suggested that the presence of less-coordinated Pt atoms on edge, corner and kink sites was significant for the selective hydrogenation of NS to AS.

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“…Low and high graphitic carbon are, e.g., carbon black (CB), single-walled or multi-walled carbon nanotube (CNT), graphene oxide (GO) [55,[163][164][165][166][167][168][169][170][171][172][173][174][175][176][177][178][179][180][181][182] and carbon nitride (CN) [183][184][185][186] among others. The semi-conducting oxides, such as TiO 2 , doped-TiO 2 and doped-SnO 2 , have been reported as support for catalytic centers [187][188][189][190][191][192][193]. The conductivity of oxides can be improved by synthesizing oxide/carbon composites [194].…”

Section: Oxygen Reduction Reaction-orr and Carbon Supportsmentioning

confidence: 99%

What Can We Learn in Electrocatalysis, from Nanoparticulated Precious and/or Non-Precious Catalytic Centers Interacting with Their Support?

2016

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This review is devoted to discussing the state of the art in the relevant aspects of the synthesis of novel precious and non-precious electrocatalysts. It covers the production of Pt-and Pd-based electrocatalysts synthesized by the carbonyl chemical route, the synthesis description for the preparation of the most catalytically active transition metal chalcogenides, then the employment of free-surfactants synthesis routes to produce non-precious electrocatalysts. A compilation of the best precious electrocatalysts to perform the hydrogen oxidation reaction (HOR) is described; a section is devoted to the synthesis and electrocatalytic evaluation of non-precious materials which can be used to perform the HOR in alkaline medium. Apropos the oxygen reduction reaction (ORR), the synthesis and modification of the supports is also discussed as well, aiming at describing the state of the art to improve kinetics of low temperature fuel cell reactions via the hybridization process of the catalytic center with a variety of carbon-based, and ceramic-carbon supports. Last, but not least, the review covers the experimental half-cells results in a micro-fuel cell platform obtained in our laboratory, and by other workers, analyzing the history of the first micro-fuel cell systems and their tailoring throughout the time bestowing to the design and operating conditions.

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Comparison of Metal-Support Interactions in Pt/TiO2 and Pt/CeO2

Cited by 154 publications

References 0 publications

Behavior of Pt Atoms on Oxide Supports During Reduction Treatments at Elevated Temperatures, Characterized by Aberration Corrected Stem Imaging

Behavior of Pt Atoms on Oxide Supports During Reduction Treatments at Elevated Temperatures, Characterized by Aberration Corrected Stem Imaging

Selective hydrogenation of nitrostyrene to aminostyrene over Pt/TiO2 catalysts: Effects of pressurized carbon dioxide and catalyst preparation conditions

What Can We Learn in Electrocatalysis, from Nanoparticulated Precious and/or Non-Precious Catalytic Centers Interacting with Their Support?

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