scholarly journals Highly durable carbon-supported Pt catalysts prepared by hydrosilane-assisted nanoparticle deposition and surface functionalization

2015 ◽  
Vol 51 (27) ◽  
pp. 5883-5886 ◽  
Author(s):  
Akinori Saito ◽  
Hiromi Tsuji ◽  
Iwao Shimoyama ◽  
Ken-ichi Shimizu ◽  
Yuta Nishina
Keyword(s):  
Surface Functionalization ◽  
Pt Nanoparticles ◽  
Carbon Support ◽  
Pt Catalysts ◽  
Support Material ◽  
One Pot ◽  
Nanoparticle Deposition ◽  
Supported Pt Catalysts

Hydrosilane enabled the formation of Pt nanoparticles and the silane functionalization of a carbon support material in one pot.

Tunable and selective hydrogenation of furfural to furfuryl alcohol and cyclopentanone over Pt supported on biomass-derived porous heteroatom doped carbon

2017 ◽  
Vol 202 ◽  
pp. 79-98 ◽  
Author(s):  
Xiuyun Liu ◽  
Bo Zhang ◽  
Benhua Fei ◽  
Xiufang Chen ◽  
Junyi Zhang ◽  
...  
Keyword(s):  
Furfuryl Alcohol ◽  
Value Added ◽  
Pt Nanoparticles ◽  
Carbon Support ◽  
Carbonization Temperature ◽  
High Dispersion ◽  
Pt Catalysts ◽  
Product Selectivity ◽  
Reaction Products ◽  
Hierarchical Porous

The search for and exploitation of efficient catalytic systems for selective conversion of furfural into various high value-added chemicals remains a huge challenge for green synthesis in the chemical industry. Here, novel Pt nanoparticles supported on bamboo shoot-derived porous heteroatom doped carbon materials were designed as highly active catalysts for controlled hydrogenation of furfural in aqueous media. The porous heteroatom doped carbon supported Pt catalysts were endowed with a large surface area with a hierarchical porous structure, a high content of nitrogen and oxygen functionalities, a high dispersion of the Pt nanoparticles, good water dispersibility and reaction stability. Benefiting from these features, the novel Pt catalysts displayed a high activity and controlled tunable selectivity for furfural hydrogenation to produce furfuryl alcohol and cyclopentanone in water. The product selectivity could be easily modulated by controlling the carbonization temperature of the porous heteroatom doped carbon support and the reaction conditions (temperature and H2 pressure). Under mild conditions (100 °C, 1 MPa H2), furfuryl alcohol was obtained in water with complete conversion of the furfural and an impressive furfuryl alcohol selectivity of >99% in the presence of Pt/NC-BS-500. A higher reaction temperature, in water, favored rearrangement of the furfural (FFA) with Pt/NC-BS-800 as the catalyst, which resulted in a high cyclopentanone yield of >76% at 150 °C and 3 MPa H2. The surface properties and pore structure of the heteroatom doped carbon support, adjusted using the carbonization temperature, might determine the interactions between the Pt nanoparticles, carbon support and catalytic reactants in water, which in turn could have led to a good selectivity control. The effect of different reaction temperatures and reaction times on the product selectivity was also explored. Combined with exploration of the distribution of the reaction products, a reaction mechanism for furfural reduction has been proposed.

A smart catalyst system for the valorization of renewable furfural in aliphatic alcohols

2016 ◽  
Vol 6 (4) ◽  
pp. 1214-1221 ◽  
Author(s):  
Zonghui Liu ◽  
Xinli Tong ◽  
Jinbiao Liu ◽  
Song Xue
Keyword(s):  
Catalyst System ◽  
Aliphatic Alcohols ◽  
Hydrogenation Process ◽  
Pt Catalysts ◽  
Oxidative Condensation ◽  
One Pot ◽  
Highly Efficient ◽  
Supported Pt Catalysts

A highly efficient and selective oxidative condensation–hydrogenation process of renewable furfural with aliphatic alcohols mediated by supported Pt catalysts in a one-pot reactor is developed.

Contrast of Highly Dispersed Metal Nanoparticles in High-resolution Secondary Electron and Backscattered Electron Images of Supported Metal Catalysts

2000 ◽  
Vol 6 (4) ◽  
pp. 388-399 ◽  
Author(s):  
Jingyue Liu
Keyword(s):  
High Resolution ◽  
Secondary Electron ◽  
Light Element ◽  
Pt Nanoparticles ◽  
Carbon Support ◽  
Supported Metal Catalysts ◽  
Backscattered Electrons ◽  
Supported Pt Catalysts ◽  
Backscattered Electron ◽  
Small Metal Particles

AbstractPlatinum nanoparticles finely dispersed in activated carbon powders have been observed with high contrast in secondary electron (SE) and backscattered electron (BE) images. The factors that contribute to the visibility of small metal particles in high-resolution BE and SE images are discussed. Monte Carlo simulations provided insight into the scattering of electrons by small, heavy-element particles located on, or embedded in, light-element supports. The visibility of Pt nanoparticles in BE images depends on many factors including the size and the location of the Pt particles, the energy of the incident electrons, and the size of the electron probe. The SE signals generated by backscattered electrons may not significantly contribute to the visibility of small Pt particles in high-resolution SE images of carbon supported Pt catalysts. Only those small Pt particles that are located on or very close to the surface of the carbon support can be revealed in high-resolution SE images.

Increased Metal Utilization in Carbon-Supported Pt Catalysts by Adsorption of Preformed Pt Nanoparticles on Colloidal Silica

Fuel Cells ◽  
2007 ◽  
Vol 7 (4) ◽  
pp. 285-290 ◽  
Author(s):  
J. Zeng ◽  
J. Y. Lee ◽  
J. Chen ◽  
P. K. Shen ◽  
S. Song
Keyword(s):  
Colloidal Silica ◽  
Pt Nanoparticles ◽  
Pt Catalysts ◽  
Supported Pt Catalysts

Contrast of Highly Dispersed Metal Nanoparticles in High-resolution Secondary Electron and Backscattered Electron Images of Supported Metal Catalysts

2000 ◽  
Vol 6 (4) ◽  
pp. 388-399
Author(s):  
Jingyue Liu
Keyword(s):  
High Resolution ◽  
Secondary Electron ◽  
Light Element ◽  
Pt Nanoparticles ◽  
Carbon Support ◽  
Supported Metal Catalysts ◽  
Backscattered Electrons ◽  
Supported Pt Catalysts ◽  
Backscattered Electron ◽  
Small Metal Particles

Abstract Platinum nanoparticles finely dispersed in activated carbon powders have been observed with high contrast in secondary electron (SE) and backscattered electron (BE) images. The factors that contribute to the visibility of small metal particles in high-resolution BE and SE images are discussed. Monte Carlo simulations provided insight into the scattering of electrons by small, heavy-element particles located on, or embedded in, light-element supports. The visibility of Pt nanoparticles in BE images depends on many factors including the size and the location of the Pt particles, the energy of the incident electrons, and the size of the electron probe. The SE signals generated by backscattered electrons may not significantly contribute to the visibility of small Pt particles in high-resolution SE images of carbon supported Pt catalysts. Only those small Pt particles that are located on or very close to the surface of the carbon support can be revealed in high-resolution SE images.

scholarly journals Influence of the Reduction Temperature and the Nature of the Support on the Performance of Zirconia and Alumina-Supported Pt Catalysts for n-Dodecane Hydroisomerization

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 88
Author(s):  
Diana García-Pérez ◽  
Maria Consuelo Alvarez-Galvan ◽  
Jose M. Campos-Martin ◽  
Jose L. G. Fierro
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Catalytic Properties ◽  
Catalytic Performance ◽  
Major Influence ◽  
Pt Catalysts ◽  
Reduction Temperature ◽  
Metal Dispersion ◽  
Tungsten Oxides ◽  
Supported Pt Catalysts

Catalysts based on zirconia- and alumina-supported tungsten oxides (15 wt % W) with a small loading of platinum (0.3 wt % Pt) were selected to study the influence of the reduction temperature and the nature of the support on the hydroisomerization of n-dodecane. The reduction temperature has a major influence on metal dispersion, which impacts the catalytic activity. In addition, alumina and zirconia supports show different catalytic properties (mainly acid site strength and surface area), which play an important role in the conversion. The NH3-TPD profiles indicate that the acidity in alumina-based catalysts is clearly higher than that in their zirconia counterparts; this acidity can be attributed to a stronger interaction of the WOx species with alumina. The PtW/Al catalyst was found to exhibit the best catalytic performance for the hydroisomerization of n-dodecane based on its higher acidity, which was ascribed to its larger surface area relative to that of its zirconia counterparts. The selectivity for different hydrocarbons (C7–10, C11 and i-C12) was very similar for all the catalysts studied, with branched C12 hydrocarbons being the main products obtained (~80%). The temperature of 350 °C was clearly the best reduction temperature for all the catalysts studied in a trickled-bed-mode reactor.

Effect of Ru surface composition on the CO tolerance of Ru modified carbon supported Pt catalysts

2004 ◽  
Vol 6 (8) ◽  
pp. 1792 ◽  
Author(s):  
E. M. Crabb ◽  
M. K. Ravikumar ◽  
D. Thompsett ◽  
M. Hurford ◽  
A. Rose ◽  
...  
Keyword(s):  
Surface Composition ◽  
Pt Catalysts ◽  
Co Tolerance ◽  
Supported Pt Catalysts
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