Advances in carbon nanotube-noble metal catalyzed organic transformations

AbstractThis review article is dealing with heterogeneous catalysis applied to synthetic chemistry using various carbon nanotube-supported noble metals (e.g., ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold).

Download Full-text

Advances in carbon nanotube-noble metal catalyzed organic transformations

nano Online ◽

10.1515/nano.0034.00029 ◽

2016 ◽

Author(s):

Jubi John ◽

Edmond Gravel ◽

Irishi N.N. Namboothiri ◽

Eric Doris

Keyword(s):

Carbon Nanotube ◽

Noble Metal ◽

Organic Transformations ◽

Metal Catalyzed

Download Full-text

Catalytic Reaction of Carbon Dioxide with Methane on Supported Noble Metal Catalysts

Catalysts ◽

10.3390/catal11020159 ◽

2021 ◽

Vol 11 (2) ◽

pp. 159

Author(s):

András Erdőhelyi

Keyword(s):

Noble Metal ◽

Reaction Mechanisms ◽

Noble Metals ◽

Carbon Deposition ◽

Metal Catalysts ◽

Noble Metal Catalysts ◽

Functional Mechanism ◽

Metal Support ◽

Supported Noble Metals ◽

Main Components

The conversion of CO2 and CH4, the main components of the greenhouse gases, into synthesis gas are in the focus of academic and industrial research. In this review, the activity and stability of different supported noble metal catalysts were compared in the CO2 + CH4 reaction on. It was found that the efficiency of the catalysts depends not only on the metal and on the support but on the particle size, the metal support interface, the carbon deposition and the reactivity of carbon also influences the activity and stability of the catalysts. The possibility of the activation and dissociation of CO2 and CH4 on clean and on supported noble metals were discussed separately. CO2 could dissociate on metal surfaces, this reaction could proceed via the formation of carbonate on the support, or on the metal–support interface but in the reaction the hydrogen assisted dissociation of CO2 was also suggested. The decrease in the activity of the catalysts was generally attributed to carbon deposition, which can be formed from CH4 while others suggest that the source of the surface carbon is CO2. Carbon can occur in different forms on the surface, which can be transformed into each other depending on the temperature and the time elapsed since their formation. Basically, two reaction mechanisms was proposed, according to the mono-functional mechanism the activation of both CO2 and CH4 occurs on the metal sites, but in the bi-functional mechanism the CO2 is activated on the support or on the metal–support interface and the CH4 on the metal.

Download Full-text

Computational Chemistry and Non-noble Metal-catalyzed Cross-coupling Reaction Mechanisms

CHIMIA International Journal for Chemistry ◽

10.2533/chimia.2020.467 ◽

2020 ◽

Vol 74 (6) ◽

pp. 467-469

Author(s):

Jeremy N. Harvey ◽

Andrea Darù

Keyword(s):

Computational Chemistry ◽

Noble Metal ◽

Reaction Mechanisms ◽

Noble Metals ◽

Coupling Reaction ◽

Cross Coupling ◽

Coupling Reactions ◽

Cross Coupling Reactions ◽

Cross Coupling Reaction ◽

Metal Catalyzed

This short overview discusses the contribution that computational methods can make to the study of reaction mechanisms in non-noble-metal-catalyzed cross-coupling reactions. The differences between such reactions and those catalyzed by more traditional noble metals are emphasized, together with the challenge this poses to computation.

Download Full-text

Advancements on Basic Working Principles of Photo-Driven Oxidative Degradation of Organic Substrates over Pristine and Noble Metal-Modified TiO2. Model Case of Phenol Photo Oxidation

Catalysts ◽

10.3390/catal11040487 ◽

2021 ◽

Vol 11 (4) ◽

pp. 487

Author(s):

Alexandra Sandulescu ◽

Crina Anastasescu ◽

Florica Papa ◽

Monica Raciulete ◽

Anca Vasile ◽

...

Keyword(s):

Noble Metal ◽

Noble Metals ◽

Catalyst Activity ◽

Oxidative Degradation ◽

Oxidation Products ◽

Oh Radicals ◽

Organic Substrates ◽

Fast Reaction ◽

Model Case ◽

Supported Noble Metals

The specific roles played by both support and noble metals in light absorption, charge separation, and the formation of ·OH and O2− (ROS) are analyzed for light-triggered oxidation of phenol (Ph) over pristine and over noble metal (Ag, Au, Pt) -loaded TiO2. Experiments show that the supported noble metals act as a light visible absorber, assist the separation of photo-charges and reduction of O2 to O2−. The O2− oxidizes mildly Ph to oxygenated products (hydroquinone, benzoquinone, and 1,2-dihydroxibenzene). In a parallel process, ·OH radicals, yielded by TiO2, mineralize Ph to CO2 by fast reaction sequences. Radical quenching and photo electrochemical measurements (surface photovoltage) confirm independently that the production of ·OH and O2− scale with oxidative conversion of Ph. The selectivity to CO2 and mild oxidation products is the result of the interplay between catalyst activity for ·OH and for O2− production.

Download Full-text

Adsorption of the Gas Molecules (NH3, C2H6O, C3H6O, CO, H2S) on noble metal (Ag, Au, Pt, Pd, Ru)–Doped MoSe2 Monolayer: A First-Principles Study

New Journal of Chemistry ◽

10.1039/d1nj01705e ◽

2021 ◽

Author(s):

Lanjuan Zhou ◽

Sujing Yu ◽

Yan Yang ◽

Qi Li ◽

Tingting Li ◽

...

Keyword(s):

Density Functional Theory ◽

Noble Metal ◽

First Principles ◽

Density Functional ◽

Noble Metals ◽

Gas Sensing ◽

Functional Theory ◽

First Principles Study ◽

Gas Molecules ◽

Sensing Performance

In this paper, the effects of five noble metals (Au, Pt, Pd, Ag, Ru) doped MoSe2 on improving gas sensing performance were predicted through density functional theory (DFT) based on...

Download Full-text

Luminescent Supramolecular Nano- or Microstructures Formed in Aqueous Media by Amphiphile-Noble Metal Complexes

Journal of Nanomaterials ◽

10.1155/2020/5395048 ◽

2020 ◽

Vol 2020 ◽

pp. 1-24 ◽

Cited By ~ 1

Author(s):

Carmen Cretu ◽

Loredana Maiuolo ◽

Domenico Lombardo ◽

Elisabeta I. Szerb ◽

Pietro Calandra

Keyword(s):

Noble Metal ◽

Smart Materials ◽

Self Assembly ◽

Noble Metals ◽

Photophysical Properties ◽

Aqueous Media ◽

Molecular Architecture ◽

Stimuli Responsive ◽

Panoramic View ◽

Amphiphilic Molecules

The involvement of metal ions within the self-assembly spontaneously occurring in surfactant-based systems gives additional and interesting features. The electronic states of the metal, together with the bonds that can be established with the organic amphiphilic counterpart, are the factors triggering new photophysical properties. Moreover, the availability of stimuli-responsive supramolecular amphiphile assemblies, able to disassemble in a back-process, provides reversible switching particularly useful in novel approaches and applications giving rise to truly smart materials. In particular, small amphiphiles with an inner distribution, within their molecular architecture, of various polar and apolar functional groups, can give a wide variety of interactions and therefore enriched self-assemblies. If it is joined with the opportune presence and localization of noble metals, whose chemical and photophysical properties are undiscussed, then very interesting materials can be obtained. In this minireview, the basic concepts on self-assembly of small amphiphilic molecules with noble metals are shown with particular reference to the photophysical properties aiming at furnishing to the reader a panoramic view of these exciting problematics. In this respect, the following will be shown: (i) the principles of self-assembly of amphiphiles that involve noble metals, (ii) examples of amphiphiles and amphiphile-noble metal systems as representatives of systems with enhanced photophysical properties, and (iii) final comments and perspectives with some examples of modern applications.

Download Full-text

Current Strategies for Noble Metal Nanoparticle Synthesis

Nanoscale Research Letters ◽

10.1186/s11671-021-03480-8 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Giyaullah Habibullah ◽

Jitka Viktorova ◽

Tomas Ruml

Keyword(s):

Noble Metal ◽

Noble Metals ◽

Drug Carriers ◽

Industrial Applications ◽

Metal Nanoparticle ◽

Noble Metal Nanoparticles ◽

Synthesis Methods ◽

Gold And Silver Nanoparticles ◽

Diverse Range ◽

The Past

AbstractNoble metals have played an integral part in human history for centuries; however, their integration with recent advances in nanotechnology and material sciences have provided new research opportunities in both academia and industry, which has resulted in a new array of advanced applications, including medical ones. Noble metal nanoparticles (NMNPs) have been of great importance in the field of biomedicine over the past few decades due to their importance in personalized healthcare and diagnostics. In particular, platinum, gold and silver nanoparticles have achieved the most dominant spot in the list, thanks to a very diverse range of industrial applications, including biomedical ones such as antimicrobial and antiviral agents, diagnostics, drug carriers and imaging probes. In particular, their superior resistance to extreme conditions of corrosion and oxidation is highly appreciated. Notably, in the past two decades there has been a tremendous advancement in the development of new strategies of more cost-effective and robust NMNP synthesis methods that provide materials with highly tunable physicochemical, optical and thermal properties, and biochemical functionalities. As a result, new advanced hybrid NMNPs with polymer, graphene, carbon nanotubes, quantum dots and core–shell systems have been developed with even more enhanced physicochemical characteristics that has led to exceptional diagnostic and therapeutic applications. In this review, we aim to summarize current advances in the synthesis of NMNPs (Au, Ag and Pt).

Download Full-text