نتایج جستجو برای: Heteropoly acid

تعداد نتایج: 747560  

Heteropoly acid promoted nanoparticle of nickel oxide samples were prepared by sol-gel method using heteropoly acids. Prepared composite was characterized by XRD, FT-IR and ICP technique. In this work, we have reported bromination of phenol, its derivatives and some aromatic compounds. The liquid phase bromination of phenol was Performed using heteropoly acids immobilized nanoparticle of nickel...

Journal: :iranian chemical communication 0
abbas mirzaie college of chemistry, shahrood university, p.o. box 36155-316, shahrood, iran ahmad afzalinia department of chemistry, payame noor university, p.o. box 7815753613, tehran, iran tahereh musabeygi department of chemistry, payame noor university, p.o. box 7815753613, tehran, iran

heteropoly acid promoted nanoparticle of nickel oxide samples were prepared by sol-gel method using heteropoly acids. prepared composite was characterized by xrd, ft-ir and icp technique. in this work, we have reported bromination of phenol, its derivatives and some aromatic compounds. the liquid phase bromination of phenol was performed using heteropoly acids immobilized nanoparticle of nickel...

2013
H. Hartati Mardi Santoso Sugeng Triwahyono Didik Prasetyoko

This paper reviews various types of heterogeneous acid-base catalysts for fragrances preparation. Catalytic activities of the various types of heterogeneous acid and base catalysts in fragrances preparation, i.e. nonzeolitic, zeolitic, and mesoporous molecular sieves, have been reported. Generally, heterogeneous acid catalysts are more commonly used in fragrance synthesis as compared to heterog...

Journal: :IOP conference series 2021

Abstract Depletion of fossil fuels resources has triggered more research on finding potential alternative sources that are sustainable such as biomass waste. However, deconstruction the complex waste into desired products is too challenging and usually require a strong catalyst with great hydrolysing property. Common acids sulphuric acid, hydrochloric acid nitric were most studies for conversio...

Journal: :Energies 2023

In this paper, we analysed the influence of corrosion processes and addition a carbon black-heteropoly phosphomolybdic acid (C45-MPA) nanocomposite on operating parameters hydride electrode obtained basis intermetallic compound La2Ni9Co. The electrochemical properties negative electrodes for NiMH batteries were studied using galvanostatic charge/discharge curves, potentiostatic method, impedanc...

Journal: : 2022

The methods of thermal analysis – thermogravimetry, differential were used to study the catalytic system phosphor-molybdenum heteropoly acid–aluminum oxide. It is shown that modification aluminum oxide has a direct effect on state acid. On surface ƞ-Al2O3, phosphomolybdic acid destroyed by interaction with strong Lewis’s sites carrier, while γ-Al2O3 it retains individuality, probably due multi...

Journal: :MATEC web of conferences 2021

Catalysis by Heteropoly acids (HPAs) and polyoxometalates (POMs) having a higher demand worldwide, as it can be designed to accelerate complex reactions more environmentally friendly. However, recycling of water-soluble solid catalysts remains problem. The synthesis recyclable composite with catalytic properties is the key better use HPAs POMs. Many researches have mentioned method immersing po...

Journal: :Chemical communications 2012
Mshari A Alotaibi Elena F Kozhevnikova Ivan V Kozhevnikov

Acidic heteropoly salt Cs(2.5)H(0.5)PW(12)O(40) doped with Pt nanoparticles is a highly active and selective catalyst for one-step hydrogenation of methyl isobutyl and diisobutyl ketones to the corresponding alkanes in the gas phase at 100 °C with 97-99% yield via metal-acid bifunctional catalysis.

Journal: :organic chemistry research 2015
saeed balalaie fatemeh tahoori negin khatibi

a simple and efficient one-pot, three-component strecker reaction of protected amino acids, aromatic aldehydes, and trimethylsilyl cyanide has been developed for the synthesis of chiral α-amino nitriles. the reaction was carried out in the presence of catalytic amount of phosphotungstic acid (h3[p(w3o10)4]) as an environmentally friendly catalyst.

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