In situ dilatometric and impedance spectroscopic study of core–shell like structures: insights into the exceptional catalytic activity of nanocrystalline Cu-doped CeO2

2015 ◽  
Vol 3 (16) ◽  
pp. 8369-8379 ◽  
Author(s):  
Philippe Knauth ◽  
Howard Saltsburg ◽  
Johanna Engel ◽  
Harry L. Tuller
Keyword(s):  
Catalytic Activity ◽  
Phase Separation ◽  
Spectroscopic Study ◽  
Catalytic Properties ◽  
Core Shell ◽  
Doped Ceo2 ◽  
Dopant Redistribution ◽  
The Impact

The impact of temperature and pO2 driven dopant redistribution and phase separation on thermo-mechanical, electrical and catalytic properties of Cu–doped CeO2 nanoparticles is explored.

Synthesis Technology of Silica Aerogels/Polystyrene Core-Shell Composite Materials

2010 ◽  
Vol 168-170 ◽  
pp. 1833-1836
Author(s):  
Gang Qiang Geng ◽  
Jing Tao Guo ◽  
Jun Jun Zou ◽  
Gong Xun Bian
Keyword(s):  
Composite Materials ◽  
Polymerization Process ◽  
System Component ◽  
Core Shell ◽  
Ultrasound Technique ◽  
The Core ◽  
Optimum Reaction ◽  
The Impact ◽  
Shell Composite

In order to obtain super aerogels heat insulating composite materials with silane coupling agent on the in-situ surface treatment. The core-shell structure composite materials have been prepared by dispersion polymerization process of polystyrene grafted on the SiO2 particles. By TEM on these samples the impact of the system components initiator polymerization parameters and dispersion process was discussed. The results showed that the system component of the greatest impact on conversion rate is the ratio of aerogels /St ,the optimum reaction temperature is 75 °C.With organic initiator KPS as initiator after a unique ultrasound technique to obtain the core-shell composite materials structure which coating is 70%.

A facile construction of Au nanoparticles on a copolymer ligand brushes modified graphene oxide nanoplatform with excellent catalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64937-64945 ◽  
Author(s):  
Yajiao Song ◽  
Jianhua Lü ◽  
Bingxin Liu ◽  
Changli Lü
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Au Nanoparticles ◽  
Catalytic Properties ◽  
High Catalytic Activity ◽  
Au Nps ◽  
Modified Graphene Oxide ◽  
Modified Graphene ◽  
Copolymer Brush

Au NPs were generated via in situ reduction on copolymer brush P(OEGMA-co-MQ) functionalized GO. MQ units in the brushes as capping agents could stabilize the Au NPs. The Au NPs–GO hybrid exhibited high catalytic activity for the reduction of 4-NP.

Controllable assembly of two types of metal nanoparticles onto block copolymer nanospheres with ordered spatial distribution

2015 ◽  
Vol 3 (7) ◽  
pp. 3382-3389 ◽  
Author(s):  
Shilin Mei ◽  
Jie Cao ◽  
Yan Lu
Keyword(s):  
Spatial Distribution ◽  
Block Copolymer ◽  
Metal Nanoparticles ◽  
Catalytic Properties ◽  
Reduction Process ◽  
Template Method ◽  
Core Shell ◽  
Aao Template ◽  
Shell Particles

Pd@PS-P2VP @DT–Au core–shell particles are fabricated based on the modified AAO template method and anin situreduction process, showing efficient optical and catalytic properties.

scholarly journals Studies of CO2 hydrogenation over cobalt/ceria catalysts with in situ characterization: the effect of cobalt loading and metal–support interactions on the catalytic activity

2020 ◽  
Vol 10 (19) ◽  
pp. 6468-6482 ◽  
Author(s):  
Kaixi Deng ◽  
Lili Lin ◽  
Ning Rui ◽  
Dimitriy Vovchok ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Catalytic Properties ◽  
Co2 Hydrogenation ◽  
In Situ Characterization ◽  
Control Activity ◽  
Metal Support ◽  
Metal Support Interactions ◽  
Ceria Catalysts

Metal–oxide interactions affect the catalytic properties of Co/CeO2 and can be used to control activity and selectivity.

scholarly journals Effect of Pyrolysis Temperature During Valorization of Date Stones on Physiochemical Properties of Activated Carbon and Its Catalytic Activity for the Oxidation of Cycloalkenes

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 686
Author(s):  
Hamed M. Alshammari ◽  
Nadir Abbas
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Calcination Temperature ◽  
Pyrolysis Temperature ◽  
Catalytic Properties ◽  
Kingdom Of Saudi Arabia ◽  
Physiochemical Properties ◽  
Pyrolysis Method ◽  
Different Temperatures ◽  
The Impact

This study presents findings on the chemical synthesis of activated carbon from Saudi dates and its structural, chemical, and catalytic properties. Dates are among the top biowaste materials in the Kingdom of Saudi Arabia, and efforts are underway to utilize this resource. A chemical pyrolysis method was used to synthesize activated carbon from date stones. Synthesized activated carbon was calcined at different temperatures of 400, 500, 600, and 700 °C, and the impact of calcination temperature on the properties of activated carbon was investigated. For this purpose, contemporary characterization tools, namely, XRD, Raman spectroscopy, FTIR, SEM, TEM, TGA, DSC, and XPS, were employed. Results are discussed and compared with associated studies. Finally, the catalytic activity of gold-deposited activated carbon for the oxidation of cycloalkenes was evaluated, and it was found that the calcination temperature has a linear positive relationship with the catalytic activity.

An advanced electrocatalyst for efficient synthesis of ammonia based on chemically coupled NiS@MoS2 heterostructured nanospheres

2021 ◽  
Author(s):  
Shoushuang Huang ◽  
Chunyan Gao ◽  
Peijun Xin ◽  
Haitao Wang ◽  
Xiao Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Core Shell ◽  
Efficient Synthesis ◽  
Hierarchical Microspheres

Here, uniform NiS@MoS2 core–shell microspheres were controllably prepared by the in situ growth of MoS2 nanosheets on the nanoplates of NiS2–NiS hierarchical microspheres, and they exhibited efficient catalytic activity for ambient NRR reaction.

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