Rh(0)/Rh(iii) core–shell nanoparticles as heterogeneous catalysts for cyclic carbonate synthesis

2017 ◽  
Vol 53 (2) ◽  
pp. 384-387 ◽  
Author(s):  
Younjae Jung ◽  
Taeil Shin ◽  
Kiseong Kim ◽  
Hyeeun Byun ◽  
Sung June Cho ◽  
...  
Keyword(s):  
High Activity ◽  
Heterogeneous Catalysts ◽  
Surface Oxidation ◽  
Cyclic Carbonate ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Rh(0)/Rh(iii) core–shell nanoparticles, generated by surface oxidation with N-bromosuccinimide, exhibited high activity and excellent recyclability for cyclic carbonate synthesis.

Preparation of Core-Shell Silica - 12-Tungstophosphoricacid Nanoparticles for Acylation of Aromatics

2013 ◽  
Vol 706-708 ◽  
pp. 219-223
Author(s):  
Hsiu Ling Hsu ◽  
Rosilda Selvin ◽  
L. Selva Roselin
Keyword(s):  
Liquid Phase ◽  
High Activity ◽  
Solid Acid ◽  
Coke Formation ◽  
Solid Acid Catalysts ◽  
Core Shell ◽  
Acid Catalysts ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles ◽  
Enhanced Selectivity

A variety of solid acid catalysts especially 12-Tungstophosphoricacid (DTP) supported on silica has been reported for the acylation of anisole, veratrole and toluene. However, the activity of this catalyst is susceptible to coke formation or poor activity. This paper reports the novelties of steam treated SiO2-DTP core-shell nanoparticles, which exhibits tremendous stability, high activity and enhanced selectivity in the liquid-phase acylation of anisole, veratrole and toluene as compared to conventional DTP supported on silica.

Impact of the capping agent removal from Au NPs@MOF core-shell nanoparticles heterogeneous catalysts

2022 ◽  
Author(s):  
Shan Dai ◽  
Kieu Phung Ngoc ◽  
Laurence Grimaud ◽  
Sanjun Zhang ◽  
Antoine Tissot ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Heterogeneous Catalysts ◽  
Synergistic Effects ◽  
Core Shell ◽  
Capping Agent ◽  
Shell Nanoparticles ◽  
Au Nps ◽  
Capping Agents ◽  
Core Shell Nanoparticles

Metal nanoparticles encased in a MOF shell have shown remarkable properties in catalysis due to potential synergistic effects. However, capping agents, commonly used to prepare these nanoparticles, lower their reactivity...

scholarly journals Core-Shell Nanostructure ofα-Fe2O3/Fe3O4: Synthesis and Photocatalysis for Methyl Orange

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Yang Tian ◽  
Di Wu ◽  
Xiao Jia ◽  
Binbin Yu ◽  
Sihui Zhan
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Methyl Orange ◽  
Molten Salts ◽  
Surface Oxidation ◽  
The Self ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Fe3O4nanoparticle was synthesized in the solution involving water and ethanol. Then,α-Fe2O3shell was produced in situ on the surface of theFe3O4nanoparticle by surface oxidation in molten salts, formingα-Fe2O3/Fe3O4core-shell nanostructure. It was showed that the magnetic properties transformed from ferromagnetism to superparamagnetism after the primaryFe3O4nanoparticles were oxidized. Furthermore, the obtainedα-Fe2O3/Fe3O4core-shell nanoparticles were used to photocatalyse solution of methyl orange, and the results revealed thatα-Fe2O3/Fe3O4nanoparticles were more efficient than the self-preparedα-Fe2O3nanoparticles. At the same time, the photocatalyzer was recyclable by applying an appropriate magnetic field.

Self-driven microstructural evolution of Au@Pd core–shell nanoparticles for greatly enhanced catalytic performance during methanol electrooxidation

Nanoscale ◽  
2021 ◽  
Author(s):  
Yaxing Liu ◽  
Weiyin Li ◽  
Guizhe zhao ◽  
Gang Qin ◽  
Yuexia Li ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Heterogeneous Catalysts ◽  
Catalytic Performance ◽  
Methanol Electrooxidation ◽  
Core Shell ◽  
Electrochemical Polarization ◽  
Shell Nanoparticles ◽  
Catalytic Materials ◽  
Core Shell Nanoparticles ◽  
Insight Into

The lack of direct insight into the microstructural evolution of catalytic materials under electrochemical polarization has inhibited the development of heterogeneous catalysts. By investigating a typical Au@Pd core–shell nanostructure, the...

Activity and Durability of PEFCs Alloy Core-Shell Catalysts: Role of Surface Oxidation

2014 ◽  
Vol 93 ◽  
pp. 31-40 ◽  
Author(s):  
Guadalupe Ramos-Sanchez ◽  
Fernando Godínez-Salomón ◽  
Omar Solorza-Feria ◽  
Perla Balbuena
Keyword(s):  
Oxygen Reduction ◽  
Density Functional ◽  
Electrochemical Characterizations ◽  
Surface Oxidation ◽  
Density Functional Theory Calculations ◽  
Oxidation Potential ◽  
Electrochemical Activity ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Low temperature fuel cells are one of the most promising systems for the transformation of fuels into electricity in an efficient, silent, and environmentally friendly manner. In this paper we show the advances accomplished in the synthesis and a theoretical-experimental analysis of the changes induced by the Ni@Pt structure and the presence of the almost unavoidable NiO species. The synthesis of core-shell nanoparticles is described and then physical and electrochemical characterizations confirm the presence of core-shell nanoparticles with a high electrochemical activity towards the Oxygen Reduction Reaction. Periodic density functional theory calculations are used to analyze the shift in the oxidation potential for Pt, Ni@Pt and NiO@Pt with different number of layers in the shell. The changes in the electrochemical activity towards oxygen reduction are evaluated by allowing oxygen to adsorb on the surface of the nanoparticle and alloys. It is found that only the first and second layers of Pt are being affected by the presence of the Ni or NiO core.

Preparation and Electrocatalytic Performance of Thin-shell Ni/Pt Core-shell Nanoparticles

2012 ◽  
Vol 27 (1) ◽  
pp. 95-101
Author(s):  
Shi-Bin LIU ◽  
Chun-Ying YANG ◽  
Zhong-Lin ZHANG ◽  
Dong-Hong DUAN ◽  
Xiao-Gang HAO ◽  
...  
Keyword(s):  
Thin Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Electrocatalytic Performance ◽  
Core Shell Nanoparticles

Pluronic-Based Core/Shell Nanoparticles for Drug Delivery and Diagnosis

2013 ◽  
Vol 20 (28) ◽  
pp. 3488-3499 ◽  
Author(s):  
Yon Jung ◽  
Hwanbum Lee ◽  
Jae Kim ◽  
Eun Koo ◽  
Keun Oh ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles
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