Enhanced thermal stability of Au@Pt nanoparticles by tuning shell thickness: Insights from atomistic simulations

2012 ◽  
Vol 22 (15) ◽  
pp. 7380 ◽  
Author(s):  
Yu-Hua Wen ◽  
Rao Huang ◽  
Cheng Li ◽  
Zi-Zhong Zhu ◽  
Shi-Gang Sun
Keyword(s):  
Thermal Stability ◽  
Shell Thickness ◽  
Pt Nanoparticles ◽  
Atomistic Simulations ◽  
Thermal Stability Of

scholarly journals In situ study of the thermal stability of supported Pt nanoparticles and their stabilization via atomic layer deposition overcoating

Nanoscale ◽  
2020 ◽  
Vol 12 (21) ◽  
pp. 11684-11693
Author(s):  
Eduardo Solano ◽  
Jolien Dendooven ◽  
Ji-Yu Feng ◽  
Philipp Brüner ◽  
Matthias M. Minjauw ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Atomic Layer Deposition ◽  
Pt Nanoparticles ◽  
Atomic Layer ◽  
Pt Nanoparticle ◽  
In Situ Study ◽  
Layer Deposition ◽  
Nanoparticle Stabilization ◽  
Thermal Stability Of

Supported Pt nanoparticle stabilization via Atomic Layer Deposition overcoating with Al2O3 has been proved to prevent particle coarsening during thermal annealing for widely spaced nanoparticles while ensuring surface accessibility for applications.

Influence of shell thickness on thermal stability of bimetallic Al–Pd nanoparticles

2014 ◽  
Vol 16 (7) ◽  
Author(s):  
John Z. Wen ◽  
Ngoc Ha Nguyen ◽  
John Rawlins ◽  
Catalin F. Petre ◽  
Sophie Ringuette
Keyword(s):  
Thermal Stability ◽  
Shell Thickness ◽  
Pd Nanoparticles ◽  
Thermal Stability Of

scholarly journals Graphene sheets manipulated the thermal-stability of ultrasmall Pt nanoparticles supported on porous Fe2O3nanocrystals against sintering

RSC Advances ◽  
2017 ◽  
Vol 7 (27) ◽  
pp. 16379-16386 ◽  
Author(s):  
Yunqian Dai ◽  
Xiaomian Qi ◽  
Wanlin Fu ◽  
Chengqian Huang ◽  
Shimei Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Pt Nanoparticles ◽  
Catalyst System ◽  
Graphene Sheets ◽  
Thermal Stability Of

This study reports a new sinter-resistant catalyst system, consisting of Pt nanoparticles on Fe2O3rhombohedrons isolated by wrinkled graphene sheets.

Thermal Stability of Pt Nanoparticles Supported on WOx/Al2O3 for n-Heptane Hydroconversion

2010 ◽  
Vol 1279 ◽  
Author(s):  
J. L. Contreras ◽  
G.A. Fuentes ◽  
J. Salmones ◽  
B. Zeifert
Keyword(s):  
Thermal Stability ◽  
Bimetallic Catalysts ◽  
Pt Nanoparticles ◽  
Thermal Stabilization ◽  
Reaction Rates ◽  
Atomic Ratio ◽  
Impregnation Method ◽  
Reduction Temperature ◽  
Sequential Samples ◽  
Thermal Stability Of

AbstractThe thermal stabilization of γ-Al2O3 using W+6 ions has been found useful to the synthesis of Pt/Al2O3 catalysts. The sequential impregnation method was used to study the effect of W6+ upon Pt/ γ-Al2O3 reducibility, Pt dispersion, Raman spectroscopy and n-heptane hydroconversion. The W/Pt atomic ratios varied from 3.28 to 75. We found that the W6+ ions delayed reduction of a fraction of Pt+4 atoms beyond 773 K. At the same time, W6+inhibited sintering of the metallic crystallites once they were formed on the surface. For the sample with a W/Pt atomic ratio of 3.28, W6+ did not inhibit the H2 reduction of Pt oxides even below of 773 K, the Pt oxides were reduced completely, however, the Pt dispersion decreased for this sample with respect to the Pt/γ-Al2O3 catalyst. After reduction at 1073 K, sequential samples impregnating Pt on WOx/γAl2O3 were more active and stable during n-heptane hydroconversion than monometallic Pt/γAl2O3 catalyst. Selectivities for dehydrocyclization, isomerization and Hydrocracking changed significantly when the W/Pt atomic ratio and reduction temperature increased. Initial and final reaction rates were more sensitive to reduction temperature. W6+ ions promoted high thermal stability of Pt crystallites when sequential catalysts were reduced at 1073 K and deactivation of bimetallic catalysts reduced at 773 K and 1073 K was less than the deactivation of Pt/Al2O3 catalyst.

Tunable thermodynamic stability of Au–CuPt core–shell trimetallic nanoparticles by controlling the alloy composition: insights from atomistic simulations

2014 ◽  
Vol 16 (41) ◽  
pp. 22754-22761 ◽  
Author(s):  
Rao Huang ◽  
Gui-Fang Shao ◽  
Yu-Hua Wen ◽  
Shi-Gang Sun
Keyword(s):  
Thermal Stability ◽  
Thermodynamic Stability ◽  
Alloy Composition ◽  
Atomistic Simulations ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Metallic Core ◽  
Core Shell Nanoparticles ◽  
Thermal Stability Of

A microscopic understanding of the thermal stability of metallic core–shell nanoparticles is of importance for their synthesis and ultimately application in catalysis.

Investigation of the thermal stability of Cu nanowires using atomistic simulations

2014 ◽  
Vol 115 (21) ◽  
pp. 213518 ◽  
Author(s):  
F. Granberg ◽  
S. Parviainen ◽  
F. Djurabekova ◽  
K. Nordlund
Keyword(s):  
Thermal Stability ◽  
Atomistic Simulations ◽  
Cu Nanowires ◽  
Thermal Stability Of
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