scholarly journals Amorphous Alloy: Promising Precursor to Form Nanoflowerpot

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Guo Lan ◽  
Zhiqiang Xie ◽  
Zhenwei Huang ◽  
Shengchen Yang ◽  
Xuhai Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Amorphous Alloy ◽  
Amorphous Alloys ◽  
High Catalytic Activity ◽  
Cu Alloy ◽  
Nanoporous Copper ◽  
Highly Dispersed ◽  
Oxidation Of Glucose

Nanoporous copper is fabricated by dealloying the amorphous Ti2Cu alloy in 0.03 M HF electrolyte. The pore and ligament sizes of the nanoporous copper can be readily tailored by controlling the dealloying time. The as-prepared nanoporous copper provides fine and uniform nanoflowerpots to grow highly dispersed Au nanoflowers. The blooming Au nanoflowers in the nanoporous copper flowerpots exhibit both high catalytic activity and stability towards the oxidation of glucose, indicating that the amorphous alloys are ideal precursors to form nanoflowerpot which can grow functional nanoflowers.

Mussel-inspired construction of thermo-responsive double-hydrophilic diblock copolymers-decorated reduced graphene oxide as effective catalyst supports for highly dispersed superfine Pd nanoparticles

Nanoscale ◽  
2018 ◽  
Vol 10 (26) ◽  
pp. 12487-12496 ◽  
Author(s):  
Haichao Duan ◽  
Yu Yang ◽  
Jianhua Lü ◽  
Changli Lü
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Pd Nanoparticles ◽  
Catalyst Supports ◽  
High Catalytic Activity ◽  
Reduced Graphene ◽  
Highly Dispersed

We report a facile, mussel-inspired construction of a thermo-responsive diblock copolymer-anchored rGO support for superfine PdNPs with high catalytic activity.

Preparation, Characterization and Catalytic Activity of Highly Dispersed Gold Catalyst

2014 ◽  
Vol 875-877 ◽  
pp. 304-307 ◽  
Author(s):  
Chun Xiu Liu ◽  
Mei Lin Jia ◽  
Yu Hong Bao ◽  
Jiang Wang ◽  
Sagala ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Gluconic Acid ◽  
Reduction Method ◽  
Gold Catalyst ◽  
Buffer Solution ◽  
Supported Gold Catalysts ◽  
Highly Dispersed ◽  
Supported Gold ◽  
Oxidation Of Glucose ◽  
Dispersed Gold

Highly dispersed supported gold catalysts have been prepared by solution reduction method using L-lysine as protection agents, and their catalytic activity was evaluated by the liquid phase catalytic oxidation reaction of glucose to gluconic acid. The results suggested that the Au/ZrO2 catalyst, exhibited high activity for the selective oxidation of glucose. At the reaction temperature of 323K, reaction time of 1h, with the NaCO3-NaHCO3 as buffer solution, the yield of gluconic acid was 100%.

A novel silver nanoparticle embedded mesoporous polyaniline (mPANI/Ag) nanocomposite as a recyclable catalyst in the acylation of amines and alcohols under solvent free conditions

RSC Advances ◽  
2014 ◽  
Vol 4 (80) ◽  
pp. 42670-42681 ◽  
Author(s):  
Usha Mandi ◽  
Anupam Singha Roy ◽  
Biplab Banerjee ◽  
Sk. Manirul Islam
Keyword(s):  
Silver Nanoparticles ◽  
Acetic Acid ◽  
Catalytic Activity ◽  
Silver Nanoparticle ◽  
Solvent Free ◽  
Organic Polymer ◽  
High Catalytic Activity ◽  
Ag Nps ◽  
Solvent Free Conditions ◽  
Highly Dispersed

Highly dispersed silver nanoparticles (Ag NPs) have been embedded into a mesoporous organic polymer (mPANI) and the material showed high catalytic activity in the acylation of amines and alcohols using acetic acid.

One-Pot Synthesis of CeO2-Supported Pd-Cu-Alloy Nanocubes with High Catalytic Activity

2013 ◽  
Vol 19 (25) ◽  
pp. 8053-8057 ◽  
Author(s):  
Kyu-Hwan Park ◽  
Young Wook Lee ◽  
Yena Kim ◽  
Shin Wook Kang ◽  
Sang Woo Han
Keyword(s):  
Catalytic Activity ◽  
High Catalytic Activity ◽  
One Pot ◽  
One Pot Synthesis ◽  
Cu Alloy ◽  
Supported Pd

scholarly journals Synthesis of Au–Cu Alloy Nanoparticles as Peroxidase Mimetics for H2O2 and Glucose Colorimetric Detection

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 343
Author(s):  
Cun Liu ◽  
Sang Hyuk Im ◽  
Taekyung Yu
Keyword(s):  
Catalytic Activity ◽  
Limit Of Detection ◽  
Colorimetric Detection ◽  
Molar Ratio ◽  
High Catalytic Activity ◽  
Alloy Nanoparticles ◽  
Research Fields ◽  
Cu Alloy ◽  
Bimetallic Alloy ◽  
Mediated Oxidation

The detection of hydrogen peroxide (H2O2) is essential in many research fields, including medical diagnosis, food safety, and environmental monitoring. In this context, Au-based bimetallic alloy nanomaterials have attracted increasing attention as an alternative to enzymes due to their superior catalytic activity. In this study, we report a coreduction synthesis of gold–copper (Au–Cu) alloy nanoparticles in aqueous phase. By controlling the amount of Au and Cu precursors, the Au/Cu molar ratio of the nanoparticles can be tuned from 1/0.1 to 1/2. The synthesized Au–Cu alloy nanoparticles show good peroxidase-like catalytic activity and high selectivity for the H2O2-mediated oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB, colorless) to TMB oxide (blue). The Au–Cu nanoparticles with an Au/Cu molar ratio of 1/2 exhibit high catalytic activity in the H2O2 colorimetric detection, with a limit of detection of 0.141 μM in the linear range of 1–10 μM and a correlation coefficient R2 = 0.991. Furthermore, the Au–Cu alloy nanoparticles can also efficiently detect glucose in the presence of glucose oxidase (GOx), and the detection limit is as low as 0.26 μM.

Highly dispersed platinum nanoparticles generated in viologen micelles with high catalytic activity and stability

2013 ◽  
Vol 1 (39) ◽  
pp. 12206 ◽  
Author(s):  
Gui-Qi Gao ◽  
Ling Lin ◽  
Cong-Min Fan ◽  
Qing Zhu ◽  
Rui-Xia Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Platinum Nanoparticles ◽  
High Catalytic Activity ◽  
Highly Dispersed

scholarly journals Electrocatalytic Oxidation of Glucose on Highly Dispersed Ni-B/Nanoporous Cu Amorphous Alloy Electrode

2013 ◽  
Vol 71 (12) ◽  
pp. 1676 ◽  
Author(s):  
Shujin Zhang ◽  
Yixiong Zheng ◽  
Linshan Yuan ◽  
Weihua Yang
Keyword(s):  
Amorphous Alloy ◽  
Electrocatalytic Oxidation ◽  
Alloy Electrode ◽  
Highly Dispersed ◽  
Oxidation Of Glucose

scholarly journals Pt/CeO2 with residual chloride as reusable soft Lewis acid catalysts: application to highly efficient isomerization of allylic esters

2021 ◽  
Author(s):  
Qi-An Huang ◽  
Asahi Haruta ◽  
Yuhya Kumamoto ◽  
Haruno Murayama ◽  
Eiji Yamamoto ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
High Catalytic Activity ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
X Ray ◽  
Solvent Free Conditions ◽  
Highly Dispersed ◽  
Silica Alumina ◽  
Allylic Esters

Abstract Heterogeneous acid and base catalysts play a crucial role in many important chemical processes. Hard Lewis and Brønsted acid catalysts like silica-alumina and zeolites have been widely applied in numerous reactions; however, developing reusable and active soft Lewis acid catalysts remain a challenge. Herein, we demonstrate for the first time that a highly dispersed supported platinum catalyst can act as a heterogeneous soft Lewis acid. High turnover numbers and reusability were observed in the isomerization of allylic esters under solvent-free conditions. Moreover, the as-prepared catalysts are characterized by X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) analyses, revealing that the highly dispersed Pt clusters with Pt–Cl bonds play a key role in the high activity. The residual chloride anion enhances the Lewis acidity of the Pt metal center and thus improves the catalytic activity. Simultaneously, the high catalytic activity of Pt/CeO2 with residual chloride and the soft Lewis acid mechanism are also proved by density functional theory (DFT) calculations based on the model reaction.

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