scholarly journals Synthesis of Bimetallic Gold-Silver (Au-Ag) Nanoparticles for the Catalytic Reduction of 4-Nitrophenol to 4-Aminophenol

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 412 ◽  
Author(s):  
Nurafaliana Berahim ◽  
Wan Basirun ◽  
Bey Leo ◽  
Mohd Johan
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Ag Nanoparticles ◽  
Catalytic Properties ◽  
Catalytic Reduction ◽  
Direct Impact ◽  
Reduction Activity ◽  
Relative Composition ◽  
Catalytic Nanoparticles ◽  
Gold Silver

Bimetallic gold-silver nanoparticles as unique catalysts were prepared using seed colloidal techniques. The catalytic capabilities of the nanoparticles were ascertained in the reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride. Our results clearly showed that the rate of 4-NP reduction to 4-AP increased with a corresponding decrease in the diameter of the bimetallic NPs. The Au-Ag nanoparticles prepared with 5.0 mL Au seed volume indicated higher reduction activity, which was approximately 1.2 times higher than that of 2.0 mL Au seed volume in the reductive conversion of 4-NP to 4-AP. However, the monometallic NPs showed relatively less catalytic activity in the reductive conversion of 4-NP to 4-AP compared to bimetallic Au-Ag nanoparticles. Our studies also reinforced the improved catalytic properties of the bimetallic Au-Ag nanoparticles structure with a direct impact of the size or diameter and relative composition of the bimetallic catalytic nanoparticles.

scholarly journals Sustainable and recyclable palladium nanoparticles–catalyzed reduction of nitroaromatics in water/glycerol at room temperature

2020 ◽  
pp. 174751982093947
Author(s):  
Bencai Dai ◽  
Yang Zhou ◽  
Changchun Liu ◽  
Jin Chen ◽  
Zhihao Shen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Palladium Nanoparticles ◽  
High Stability ◽  
Room Temperature ◽  
Catalytic Reduction ◽  
Ambient Pressure ◽  
Green Solvents ◽  
Reduction Activity ◽  
Water Glycerol ◽  
Low Consumption

Palladium nanoparticles with unique catalytic activity and high stability are synthesized. These nanoparticles exhibit excellent catalytic reduction activity for nitroaromatics in green solvents in the presence of H2 at ambient pressure and temperature. The prominent advantages of this nanotechnology include low consumption of catalyst, excellent chemoselectivity, high reusability of the catalyst, and environmentally green solvents.

scholarly journals Synthesis and Catalytic Activity Studies of Silver Nanoparticles Stabilized in Polymeric Hydro Gel

2021 ◽  
Author(s):  
Jaya T. Varkey
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Heterogeneous Catalysis ◽  
Conventional Method ◽  
Metallic Nanoparticles ◽  
Biomedical Applications ◽  
Catalytic Reduction ◽  
Catalytic Activities ◽  
Flexible Support ◽  
Profound Influence

Silver nanoparticles (AgNPs) are one of the most vital and fascinating nanomaterials among several metallic nanoparticles that are involved in biomedical applications. But their stabilization towards agglomeration is a serious concern. Synthesized silver nanoparticles can be dispersed in polymeric hydrogel for stabilization and can be efficiently used in heterogeneous catalysis. Polystyrene crosslinked with 1, 6-hexanediol diacrylate can be suitably functionalized for catalytic activities. The nature of the support has a profound influence on the reactivity of the polymeric resin. A flexible support with optimum hydrophilic and hydrophobic balance enhanced the reactivity of the supporting system. Using this supported AgNPs catalytic reduction of Para-nitro phenol can be easily accomplished comparing to conventional method.

Effect on Addictives Adding of Mn-Ce/TiO2 Selective Catalytic Reduction NO by NH3 at Low-Temperature

2014 ◽  
Vol 955-959 ◽  
pp. 25-29 ◽  
Author(s):  
Bin Wu
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Conversion Efficiency ◽  
Catalytic Properties ◽  
Catalytic Reduction ◽  
Catalytic Conversion ◽  
No Conversion ◽  
Performance Results

Additives addition into Mn-Ce/TiO2 which had good low-temperature catalytic properties was studied, so as to improve its low-temperature anti-poisoning performance. Results showed that catalytic activity of Mn-Ce/TiO2 added additives V, Fe and Cu (short for Mn-M-Ce/TiO2 ) was improved all, compared with 95% NO conversion efficiency of Mn-Ce/TiO2 at temperature of 120°C, the ratio of Mn-M-Ce/TiO2 reached nearly 100%. Mn-Fe-Ce/TiO2 had the best single anti-poisoning ability, under the existence of 7% vapor, its catalytic conversion efficiency could be always kept over 90% at 120°C.The anti-SO2 poisoning ability at low-temperature reduced after adding additives Fe and Cu. catalytic conversion efficiency of Mn-Fe-Ce/TiO2 and Mn-Cu-Ce/TiO2 could be close to 90% at temperature of 180°C when water and SO2 exist simultaneously.

Supports matter: unraveling the role of charge transfer in the plasmonic catalytic activity of silver nanoparticles

2017 ◽  
Vol 5 (23) ◽  
pp. 11720-11729 ◽  
Author(s):  
Letizia Papa ◽  
Isabel C. de Freitas ◽  
Rafael S. Geonmonond ◽  
Caroline B. de Aquino ◽  
Joana C. Pieretti ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Charge Transfer ◽  
Ag Nanoparticles ◽  
Catalytic Activities

This paper unravels the role played by charge transfer to and from Ag nanoparticles in their plasmonic catalytic activities.

scholarly journals Facile simultaneous synthesis of tetraaniline nanostructures/silver nanoparticles as heterogeneous catalyst for the efficient catalytic reduction of 4-nitrophenol to 4-aminophenol

RSC Advances ◽  
2020 ◽  
Vol 10 (37) ◽  
pp. 22043-22053
Author(s):  
Sathish Mohan Botsa ◽  
Yarramsetti Pavan Kumar ◽  
Keloth Basavaiah
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Model Reduction ◽  
Heterogeneous Catalyst ◽  
Sodium Borohydride ◽  
Catalytic Reduction ◽  
Excess Sodium ◽  
Simultaneous Synthesis

Nanocomposites of tetraaniline/silver nanoparticles were synthesised using an interfacial polymerisation method. The catalytic activity was investigated for the model reduction of 4-nitrophenol to 4-aminophenol in the presence of excess sodium borohydride.

Multiple Silver Nanoparticles Anchored Hollow Mesoporous Silica Nanospheres by Polyacrylic Acid Aggregate Templating Approach for Catalytic Reduction of p-Nitrophenol

2018 ◽  
Vol 18 (12) ◽  
pp. 8307-8312 ◽  
Author(s):  
Peng Xu ◽  
Nannan Chen ◽  
Huan Lin ◽  
Changli Cen ◽  
Zhenguo Wu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Mesoporous Silica ◽  
Polyacrylic Acid ◽  
Ag Nanoparticles ◽  
Catalytic Reduction ◽  
Metal Catalyst ◽  
Silica Nanospheres ◽  
One Pot ◽  
Hollow Mesoporous Silica ◽  
Mesoporous Silica Nanospheres

Anchoring metal cores inside porous shells can endow metal catalyst with high selectivity and stability. Herein, multiple silver nanoparticles were successfully anchored in hollow mesoporous silica nanospheres (Ag@HMSNs) through a facile one-pot method. Polyacrylic acid aggregates self-assembled in water/ethanol solvent were used as core templates and Ag nanoparticles captors, and hexadecyl trimethoxysilane (C16TMS) was used as the pore-making agent. The hollow cavity, encapsulated multiple Ag nanoparticles, and mesoporous silica shell of the Ag@HMSNs were confirmed by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and nitrogen sorption analysis. Just as expected, Ag nanoparticles (2–5 nm) were encapsulated in the cavity of hollow mesoporous silica nanospheres with the size of about 200 nm. The fabricated Ag@HMSNs showed excellent performance for catalytic reduction of p-nitrophenol (4-NP). Also, catalytic activity of the Ag@HMSNs for 4-NP reduction was increased with the addition amount of the pore-making agents and surface areas. The superior catalytic performance was attributed to the unique structural features of Ag@HMSNs architecture, in which the mesoporous shell provided readily accessible pathway for fast transport of reactants to the encapsulated Ag nanoparticles.

scholarly journals Catalytic and Electrochemical Properties of Ag Infiltrated Perovskite Coatings for Propene Deep Oxidation

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 729
Author(s):  
Thai Giang Truong ◽  
Benjamin Rotonnelli ◽  
Mathilde Rieu ◽  
Jean-Paul Viricelle ◽  
Ioanna Kalaitzidou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ag Nanoparticles ◽  
Screen Printing ◽  
Catalytic Properties ◽  
Deep Oxidation ◽  
Electrochemical Performances ◽  
Catalytic Layer ◽  
Propene Oxidation ◽  
Ion Conductor ◽  
Rate Determining Step

This study reports the catalytic properties of Ag nanoparticles dispersed on mixed ionic and electronic conducting layers of LSCF (La0.6Sr0.4Co0.2Fe0.8O3) for propene combustion. A commercial and a synthesized LSCF powder were deposited by screen-printing or spin-coating on dense yttria-stabilized zirconia (YSZ) substrates, an oxygen ion conductor. Equal loadings (50 µg) of Ag nanoparticles were dispersed via drop-casting on the LSCF layers. Electrochemical and catalytic properties have been investigated up to 300 °C with and without Ag in a propene/oxygen feed. The Ag nanoparticles do not influence the electrochemical reduction of oxygen, suggesting that the rate-determining step is the charge transfer at the triple phase boundaries YSZ/LSCF/gas. The anodic electrochemical performances correlate well with the catalytic activity for propene oxidation. This suggests that the diffusion of promoting oxygen ions from YSZ via LSCF grains can take place toward Ag nanoparticles and promote their catalytic activity. The best specific catalytic activity, achieved for a LSCF catalytic layer prepared by screen-printing from the commercial powder, is 800 times higher than that of a pure Ag screen-printed film.

Facile in situ synthesis of silver nanoparticles on boron nitride nanosheets with enhanced catalytic performance

2015 ◽  
Vol 3 (32) ◽  
pp. 16663-16669 ◽  
Author(s):  
Heng Shen ◽  
Chunting Duan ◽  
Jing Guo ◽  
Ning Zhao ◽  
Jian Xu
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Boron Nitride ◽  
Ag Nanoparticles ◽  
Catalytic Performance ◽  
In Situ Synthesis ◽  
Boron Nitride Nanosheets ◽  
Fe Complex

Ag nanoparticles are in situ decorated on a BNNS modified with a TA–Fe complex, and the nanohybrids show excellent catalytic activity.

Core–shell Co@SiO2 nanosphere immobilized Ag nanoparticles for hydrogen evolution from ammonia borane

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89450-89456 ◽  
Author(s):  
Qilu Yao ◽  
Zhang-Hui Lu ◽  
Yujuan Hu ◽  
Xiangshu Chen
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Ag Nanoparticles ◽  
Ammonia Borane ◽  
Core Shell ◽  
Hydrolysis Of

Silver nanoparticles anchored on core–shell Co@SiO2 nanospheres (Co@SiO2/Ag) have been facilely prepared by using an in situ generated approach, and exhibited higher catalytic activity than their monometallic counterparts for the hydrolysis of AB.

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