Hybrid “Golden Fleece”: Synthesis and Catalytic Performance of Uniform Carbon Nanofibers and Silica Nanotubes Embedded with a High Population of Noble-Metal Nanoparticles

2007 ◽  
Vol 17 (4) ◽  
pp. 637-643 ◽  
Author(s):  
H.-S. Qian ◽  
M. Antonietti ◽  
S.-H. Yu
Keyword(s):  
Metal Nanoparticles ◽  
Carbon Nanofibers ◽  
Noble Metal ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
High Population ◽  
Silica Nanotubes

scholarly journals Polyethyleneimine-Oleic Acid Micelles-Stabilized Palladium Nanoparticles as Highly Efficient Catalyst to Treat Pollutants with Enhanced Performance

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1890
Author(s):  
Xiang Lai ◽  
Xuan Zhang ◽  
Shukai Li ◽  
Jie Zhang ◽  
Weifeng Lin ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Palladium Nanoparticles ◽  
Human Life ◽  
Catalytic Performance ◽  
Water Soluble ◽  
Noble Metal Nanoparticles ◽  
Hydrodynamic Diameter ◽  
Efficient Catalyst

Water soluble organic molecular pollution endangers human life and health. It becomes necessary to develop highly stable noble metal nanoparticles without aggregation in solution to improve their catalytic performance in treating pollution. Polyethyleneimine (PEI)-based stable micelles have the potential to stabilize noble metal nanoparticles due to the positive charge of PEI. In this study, we synthesized the amphiphilic PEI-oleic acid molecule by acylation reaction. Amphiphilic PEI-oleic acid assembled into stable PEI-oleic acid micelles with a hydrodynamic diameter of about 196 nm and a zeta potential of about 34 mV. The PEI-oleic acid micelles-stabilized palladium nanoparticles (PO-PdNPsn) were prepared by the reduction of sodium tetrachloropalladate using NaBH4 and the palladium nanoparticles (PdNPs) were anchored in the hydrophilic layer of the micelles. The prepared PO-PdNPsn had a small size for PdNPs and good stability in solution. Noteworthily, PO-PdNPs150 had the highest catalytic activity in reducing 4-nitrophenol (4-NP) (Knor = 18.53 s−1mM−1) and oxidizing morin (Knor = 143.57 s−1M−1) in aqueous solution than other previous catalysts. The enhanced property was attributed to the improving the stability of PdNPs by PEI-oleic acid micelles. The method described in this report has great potential to prepare many kinds of stable noble metal nanoparticles for treating aqueous pollution.

Enhanced Catalytic Activity of Magnetic Bimetallic Ag–Au Nanoparticles Mediated by Surface Plasmon Resonance

2021 ◽  
Vol 21 (5) ◽  
pp. 3107-3114
Author(s):  
Zhuo-Rui Li ◽  
Geng Zhu ◽  
Guo-Zhi Han
Keyword(s):  
Catalytic Activity ◽  
Surface Plasmon Resonance ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Au Nanoparticles ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Noble Metal Nanoparticles

We firstly discover the enhanced catalytic activity of magnetic noble metal nanoparticles mediated by surface plasmon resonance. Under light irradiation with certain wavelength, the catalytic performance of magnetic noble metal nanoparticles shows changes with different degrees and directions that are associated with the surface plasmon resonance (SPR) of the noble metal. Moreover, the coupling of silver and gold allows the catalytic performance of magnetic bimetallic Ag–Au nanoparticles to show more positive response to surface plasmon resonance. The magnetic bimetallic Ag–Au nanoparticles show excellent catalytic performance toward the reduction reaction of aromatic nitro group, and corresponding rate constant of the catalytic reduction reaction increases about three times with light irradiation.

Fabrication of noble metal nanoparticles decorated on one dimensional hierarchical polypyrrole@MoS2 microtubes

2020 ◽  
Vol 8 (34) ◽  
pp. 7801-7811 ◽  
Author(s):  
Yang Ling ◽  
Tiantian Cao ◽  
Libin Liu ◽  
Jingli Xu ◽  
Jing Zheng ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
One Dimensional

Herein, we present a facile strategy to fabricate noble metal (Ag, Au, Pd) decorated on PPy@MoS2 microtubes. As a proof of application, the ternary PPy@MoS2@Au hybrids reveal excellent enzyme-like catalytic performance.

A seed-mediated approach to the general and mild synthesis of non-noble metal nanoparticles stabilized by a metal–organic framework for highly efficient catalysis

2015 ◽  
Vol 2 (6) ◽  
pp. 606-612 ◽  
Author(s):  
Yu-Zhen Chen ◽  
Linfeng Liang ◽  
Qihao Yang ◽  
Maochun Hong ◽  
Qiang Xu ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metals ◽  
Metal Organic Framework ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Metal Organic ◽  
Seed Mediated

A novel noble metal-seed-mediated approach to reduce non-noble metals under mild conditions to afford non-noble metal NPs with superior catalytic performance.

Noble metal enhanced photocatalytic activity of heterostructured TiO2 spheres with tunable interiors and shells

2020 ◽  
Vol 13 (08) ◽  
pp. 2050039
Author(s):  
Bo Qiu ◽  
Xin Xiao ◽  
Min Zhang ◽  
Yue Mao ◽  
Xiaoheng Liu
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Precious Metal ◽  
Active Sites ◽  
Inner Core ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
Oxide Support ◽  
Metal Support Interaction ◽  
Metal Support

Heterostructured TiO2 spheres with tunable interiors and shells were prepared by self-template technology. This structure is composed of a hollow shell and an inner core which can enhance light scattering in the hollow space and provide a large surface to generate sufficient active sites. Besides, the nanosheets grown on the shell layer not only increased their specific surface area, but also exposed more surface-active sites. The performance of photocatalysts was estimated by the RhB decolorization, and experimental results show that the photoactivity can be greatly improved by depositing noble metal nanoparticles. It improves the efficiency of charge utilization and enhances the overall catalytic performance from the three stages of charge carrier generation, separation and surface reaction. The strong metal–support interaction (SMSI) between the noble metal nanoparticles and the oxide support has been proven to inhibit the supported precious metal, one strategy for nanoparticle aggregation and growth. On the one hand, the nanoshells isolate the precious metal nanoparticles from each other, preventing the aggregation of metal nanoparticles.

scholarly journals Noble Metal Nanoparticles Incorporated Siliceous TUD-1 Mesoporous Nano-Catalyst for Low-Temperature Oxidation of Carbon Monoxide

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1067 ◽  
Author(s):  
Badria M. Al-Shehri ◽  
Mohd Shkir ◽  
A. S. Khder ◽  
Ajeet Kaushik ◽  
Mohamed S. Hamdy
Keyword(s):  
Carbon Monoxide ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Nano Catalyst ◽  
Nano Catalysts ◽  
Oxidation Of Carbon Monoxide

This report, for the first time, demonstrated the low-temperature oxidation of carbon monoxide (CO) using nano-catalysts consisting of noble metal nanoparticles incorporated in TUD-1 mesoporous silica nano-structures synthesized via a one-pot surfactant-free sol–gel synthesis methodology. Herein, we investigated a nano-catalyst, represented as M-TUD-1 (M = Rh, Pd, Pt and Au), which was prepared using a constant Si/M ratio of 100. The outcome of the analytical studies confirmed the formation of a nano-catalyst ranging from 5 to 10 nm wherein noble metal nanoparticles were distributed uniformly onto the mesopores of TUD-1. The catalytic performance of M-TUD-1 catalysts was examined in the environmentally impacted CO oxidation reaction to CO2. The catalytic performance of Au-TUD-1 benchmarked other M-TUD-1 catalysts and a total conversion of CO was obtained at 303 K. The activity of the other nano-catalysts was obtained as Pt-TUD-1 > Pd-TUD-1 > Rh-TUD-1, with a total CO conversion at temperatures of 308, 328 and 348 K, respectively. The Au-TUD-1 exhibited a high stability and reusability as indicated by the observed high activity after ten continuous runs without any treatment. The outcomes of this research suggested that M-TUD-1 are promising nano-catalysts for the removal of the toxic CO gas and can also potentially be useful to protect the environment where a long-life time, cost-effectiveness and industrial scaling-up are the key approaches.

scholarly journals One-Pot Facile Synthesis of Noble Metal Nanoparticles Supported on rGO with Enhanced Catalytic Performance for 4-Nitrophenol Reduction

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7261
Author(s):  
Xiaolong Zhang ◽  
Shilei Jin ◽  
Yuhan Zhang ◽  
Liyuan Wang ◽  
Yang Liu ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Measurement Techniques ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
Pt Catalyst ◽  
One Pot ◽  
K Value ◽  
Nitrophenol Reduction ◽  
Gold Silver

In this study, reduced graphene oxide (rGO)-supported noble metal (gold, silver, and platinum) nanoparticle catalysts were prepared via the one-pot facile co-reduction technique. Various measurement techniques were used to investigate the structures and properties of the catalysts. The relative intensity ratios of ID/IG in rGO/Au, rGO/Ag, rGO/Pt, and GO were 1.106, 1.078, 1.047, and 0.863, respectively. The results showed the formation of rGO and that noble metal nanoparticles were decorated on rGO. Furthermore, the catalytic activities of the designed nanocomposites were investigated via 4-nitrophenol. The catalysts were used in 4-nitrophenol reduction. The catalytic performance of the catalysts was evaluated using the apparent rate constant k values. The k value of rGO/Au was 0.618 min−1, which was higher than those of rGO/Ag (0.55 min−1) and rGO/Pt (0.038 min−1). The result proved that the rGO/Au catalyst exhibited a higher catalytic performance than the rGO/Ag catalyst and the rGO/Pt catalyst. The results provide a facile method for the synthesis of rGO-supported nanomaterials in catalysis.

Sign in / Sign up

Export Citation Format

Share Document