:
We straightforwardly synthesized 18 different types of palladium nanoparticles by using a series of palladium
metal precursors and ionic liquids. All the materials went for XRD, TEM, and ICP-OES analysis, before going to Heck
cross-coupling reaction as a catalyst. We evaluated the catalytic performance of our developed IL#Pd MNP catalyst over
Heck cross-coupling reaction between different terminal olefins with various 3-iodo-benzopyrones, including sterically hindered, electron-rich, electron neutral and electron-deficient systems. We obtained the Heck cross-coupling reaction product
in good to average yield under phosphine free reaction condition with an added advantage of 6 times catalyst recycling.
:
In this report, a hybrid terpyridine (tpy) ligand functionalized with magnetic support was synthesized to obtain well-dispersed Ru NPs with a 2.0±0.5 nm mean size. This material was further analyzed using different analytical techniques before utilizing it as a catalyst for the CO¬2 hydrogenation reaction. A noticeable application of Ru-deposited magnetic nanoparticles as catalysts was observed during the CO2 hydrogenation. We successfully synthesized the formic acid with a high TON value under high-pressure reaction conditions. Easy recovery of the catalyst under the applied magnetic field helped us to reuse the catalyst up to 6 times with good TON and TOV value.
:
A series of alumina supported Ru nanoparticles (Ru γ -Al2O3-x (x=2-10 Ru wt%) were synthesized using
ethylene glycol reduction method. XRD, TEM, EDX, H2-chemisorption, XPS and H2-TPD analytical
techniques were used to understand the physiochemical nature of alumina supported Ru nanoparticles.
All the well characterized Ru#Al2O3-x (x=2-10 Ru wt%) catalysts were used for high pressure CO2
hydrogenation to formic acid synthesis. A clear correlation was recorded between the physiochemical
properties of developed catalysts and the molar quantity of formic acid. Among all the developed
catalysts, Ru#Al2O3-2 catalyst with or without ionic liquid reaction medium gave good molar quantity of
formic acid. Application of ionic liquid was also expanded, and ionic liquid medium appeared as a good
solvent system over amine solvent system which not only provides better solubility of reactants and
catalysts but also found useful in the easy recovery of formic acid after the completion of reaction. 7
times catalyst recycling with easy product isolation stem makes this system very useful and near the
requirement of sustainable chemistry.
new Pt metal based nano-catalytic system was developed using organic-inorganic magnetic
framework followed by the user-friendly protocol in good yield. XRD, FTIR, TEM, BET, ICP-OES
and solid-state NMR techniques were used to characterize our developed catalytic system. The wellcharacterized
ionic liquid bridged-silica supported magnetic Pt nanoparticles were utilized for the selective
hydrogenation of carbon dioxide under high-pressure reaction condition (with and without ionic liquid
medium). Most promising results were obtained while using the catalytic system (Pt-MagNP@ILSiO2)
in 1,3-di (N, N-dimethylaminoethyl)-2-methylimidazolium nonafluorobutanesulfonate ([DAMI]
[CF3CF2CF2CF2SO3]) task-specific ionic liquid medium. This TSIL not only provided a high degree of
CO2 absorption during the reaction but also enhances the selectivity and the recyclability of the catalytic
system up to 8 runs. No sign of Pt metal leaching was recorded during the recyclability test which
confirmed the stability of this catalytic system under high-pressure reaction condition.
Background:
Approximate computing is an emerging trend in recent year that trades off the requirement of exact computation
for the improvement of speed and power performance.
Objective:
Researchers are trying to improve the speed and power performance proposing different algorithm.
Method:
This paper proposes approximate compressors used for the design of approximate multipliers.
Results:
By using the proposed method, approximate multipliers of different length have been synthesized and a comparative study with
previously presented multipliers have been dealt here which shows that the proposed circuits have better speed and power.
Conclusion:
Finally the proposed circuits have been used for image processing applications.
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