Novel nano catalyst systems comprised of PbS nanoparticles immobilized into the nanospaces of ionic liquid (IL)-based KCC-1 (KCC-1/IL/PbS) have been described for the dehydrogenation of aqueous ...solutions of HCOOH/HCOONa to H2 and CO2 gas due to not only the unique dendritic fibrous morphology of the support, which made the active sites accessible, but also the synergistic effect between KCC-1/IL and the small PbS NPs. KCC-1 with high surface area was functionalized with ionic liquid (IL) acting as the robust anchors so that the nanoparticles were well-dispersed on the fibers of the KCC-1 microspheres, without aggregation. Because of the amplification effect of IL, high loading capacities of the nanocatalysts were achieved. The synthesized KCC-1/IL/PbS nanocatalyst exhibited excellent catalytic activity in dehydrogenation of aqueous solutions of HCOOH/HCOONa to H2 and CO2 under mild conditions to the easy accessibility of the active sites.
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•Ionic liquid (IL) modified fibrous nano-silica material KCC-1 for the first time.•It was used as a recyclable catalyst for selective dehydrogenation of HCOOH/HCOONa.•High catalytic activity and ease of recovery from the reaction mixture using filtration.
We have found that UiO-66-NH
2
can be used as an excellent support for the synthesis of highly sparse nanoparticles. UiO-66-NH
2
has a high surface area that was functionalized with ...tetrathia-azacyclopentadecane (TTACP) groups acting as strong conjugation sites so that Ni@Pd nanoparticles were well dispersed without aggregation on the structures of the UiO-66-NH
2
microspheres (UiO-66-NH
2
/TTACP/Ni@Pd). The synthesized UiO-66-NH
2
/TTACP/Ni@Pd magnetic nanoparticles (MNPs) exhibited excellent catalytic activity for the reduction of 2-nitroaniline and 4-nitrophenol.
UiO-66-NH
2
/TTACP/Ni@Pd MNPs exhibited excellent catalytic activity for the reduction of 2-nitroaniline and 4-nitrophenol.
Increasing the production of energy in line with industry development, transportation, and life quality improvement is an interesting topic needs to be addressed. Energy policymakers and researchers ...have aimed at energy management, particularly by improving energy systems performance. This review paper explains the rising interest of thermoelectric technology and applications. Nowadays, thermoelectric technology such as thermoelectric generators (TEGs) and thermoelectric cooling systems (TECs) provide heat loss recovery of thermodynamic units for power production of remote areas. Unlimited solar energy can also be employed for thermoelectric power production. This paper describes the principles of thermoelectricity and presents an explanation of current and upcoming materials. Developed models and various performed optimization of thermoelectric applications by using non-equilibrium thermodynamics and finite time thermodynamics are discussed as well. Additionally, a number of topical applications and energy resources are introduced. The main goal of this study is to give a clear overview of thermoelectric technology and applications.
•Explains the rising interest of thermoelectric technology and applications.•Describes thermoelectricity principles and current and upcoming materials.•Developed models and various performed optimization are discussed.•Includes non-equilibrium thermodynamics and finite time thermodynamics.•A number of topical applications and energy resources are introduced.
Various morphologies of a nano CuAl2O4 fiber microsphere were produced through diverse synthesis situations. The findings showed that the morphology, anatomy, and quantity of the fibers in the ...CuAl2O4 product are vigorously correlated with the various mechanical pressures, calcination, and hydrothermal processing time. Subsequent research has also shown that the best type of sample offers a variety of catalytic functions for carbocarboxylation of styrenes deploying CO2 and amines by reducing the efficiency of dandelion-like CuAl2O4 fiber anatomy. The reaction is catalyzed by the photoredox catalyst and is adaptable with various amines and styrenes. This approach provides extremely functionalized γ-amino acids in satisfactory efficiencies with extreme regioselectivity. The reported synthesis is the first example of visible light induced synthesis of a γ-amino acid from CO2 and includes several advantages like environmentally benign reaction conditions, a minimum amount of catalyst due to fiber structure, cost effectiveness, operational simplicity, short reaction times, excellent yields, and high atom economy, making it a genuinely green protocol.
This study investigates the potential application of an efficient, easily recoverable and reusable KCC-1 nanoparticle-supported Salen/Ru(II) catalyst in the synthesis of 2-oxazolidinones from CO
2
, ...and propargylic amines. The KCC-1/Salen/Ru(II) NPs were thoroughly characterized by using TEM, SEM, TGA, FT-IR, ICP-MS, and BET. This observation was exploited in the direct and selective chemical fixation of CO
2
, affording high degrees of CO
2
capture and conversion. The recycled catalyst has been analyzed by ICP-MS showing only minor changes in the morphology after the reaction, thus confirming the robustness of the catalyst.
Graphical Abstract
In this research, a novel approach to produce a novel nanocatalyst, AgBr supported on an ionic gelation (IG)-based nanomaterial, was developed through the aqueous coprecipitation approach for the ...dendritic fibrous nanosilica (DFNS) production and the wet impregnation method for IG coating, taking into account TPP as the cross-linking agent. In addition, DFNS/IG@Ag(i) had heterogeneous features that contributed to the quick improvement of the catalyst by filtration separation. The catalytic activity of DFNS/IG@Ag(i) was examined to synthesize β-oxopropylcarbamates through a multicomponent coupling of CO2, amines and propargyl alcohols in moderate conditions. The DFNS/IG@Ag(i) NPs were completely investigated by taking advantage of TG, TEM, FESEM and FT-IR spectroscopy analyses. The DFNS/IG@Ag(i) nanocatalyst indicated high stability in the reaction for five cycles without considerable loss of some properties like activity, which could be because of the high loading of IG on the catalyst surface.
Here we demonstrate the synthesis of benzimidazolones from
o
-phenylenediamines and carbon dioxide in the presence of gold nanoparticles supported on a composite material based on microcrystalline ...chitosan from shrimp shells and fibrous phosphosilicate (CS-FPS/Au). The results showed that the gold nanoparticles were stable with the P, N and O atoms of CS-FPS. The morphology and structure of FPS leads to a higher catalytic activity. The CS-FPS/Au NPs were thoroughly characterized using TEM, FESEM, TGA, FTIR, and BET.
We demonstrate the synthesis of benzimidazolones from
o
-phenylenediamines and CO
2
in the presence of gold nanoparticles supported on a composite material based on microcrystalline chitosan from shrimp shells and fibrous phosphosilicate.
This study investigated the potential application of an efficient, easily recoverable, and reusable copper(II)-based catalyst bearing polyvinyl alcohol (PVA) immobilized on FeNi
3
/KCC-1/APTPOSS FeNi
...3
/KCC-1/APTPOSS/TCT/PVA/Cu(II) magnetic nano-particles (MNPs) for the
N
-formylation of amines via CO
2
hydrogenation. FeNi
3
/KCC-1/TCT/PVA/Cu(II) MNPs were thoroughly characterized by transmission electron microscopy, field emission-scanning electron microscopy, vibrating sample magnetometry, thermo-gravimetric analysis, inductively coupled plasma-mass spectrometry (ICP-MS), and the Brunauer, Emmett, and Teller method. After the reaction, only minor changes to the morphology of the catalyst recycled by the ICP-MS were evidenced, thus corroborating its robustness.
Graphical Abstract
In the present work, fibrous phosphosilicate (FPS) was functionalized by using octakis3-(3-aminopropyltriethoxysilane)propyloctasilsesquioxane (APTPOSS) groups that act as strong performers. In this ...regard, the nanoparticles of CoMn2O4 were dispersed, properly, on FPS microsphere (CoMn2O4/APTPOSS@FPS) fibers. Agricultural and industrial waste waters contain nitrophenols. They are amongst the most common organic pollutants. In water, low concentrations are harmful to human health and aquatic life owing to the potential mutagenic and carcinogenic influences of nitrophenols. 4-Nitrophenol (4-NP), as well as 2-nitroaniline (2-NA), are known hazardous toxic waste contaminants and are included in the United States Environmental Protection Agency (USEPA) list. Thus, to eliminate them, novel methods are necessary. In addition, o-phenylenediamine (o-PDA) and 4-aminophenol (4-AP) are considered as significant intermediates for the synthesis of dyes and drugs, which are synthesized from 2-NA and 4-NP. Nanoparticles of CoMn2O4/APTPOSS@FPS utilized for the reduction of 2-NA and 4-NP, increase the efficiency of the reaction with considerable chemoselectivity. The results showed that the P and O atoms of lignin-FPS gold nanoparticles (NPs) were stable and the morphology and structure of FPS increased the catalytic activity.
Bis(4-pyridylamino)triazine stabilized on Fe
3
O
4
/KCC-1 as a novel, inexpensive and non-corrosive nano structural compound catalyzed the synthesis
N
-substituted-1,4-dihydropyridines. High ...catalytic activity, ease of recovery from the reaction mixture using an external magnet, and the ability to be reused several times without a significant performance loss are additional eco-friendly attributes of this catalytic system.
Fe
3
O
4
/KCC-1/BPAT as a novel nanostructured compound catalyzed the synthesis of
N
-substituted 1,4-dihydropyridines.
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