Catalytic Disproportionation of Chlorosilanes Using Imidazolium Ionic Liquids Deposited on Polymer Supports

2020 ◽  
Vol 20 (4) ◽  
pp. 247-259
Author(s):  
A. V. Vorotyntsev ◽  
A. N. Markov ◽  
A. N. Petukhov ◽  
V. I. Pryakhina ◽  
M. E. Atlaskina ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Chemical Activity ◽  
Porous Polymer ◽  
Catalytic Systems ◽  
Imidazolium Ionic Liquids ◽  
Polymer Supports

Highly selective catalytic systems with porous polymer supports immobilized with ionic liquids, which contained acceptor and donor substituents as well as various anions, were developed. Their effect on activity of the catalysts in disproportionation of trichlorosilane was studied. The catalytic activity of systems based on N-methoxy-4-methylimidazole with different counterions was shown to decrease with the growth of chemical activity of the anions from iodine to fluorine.

Catalytic Disproportionation of Chlorosilanes Using Imidazolium Ionic Liquids Supported on Polymer Supports

2021 ◽  
Vol 13 (1) ◽  
pp. 1-11
Author(s):  
A. V. Vorotyntsev ◽  
A. N. Markov ◽  
A. N. Petukhov ◽  
V. I. Pryakhina ◽  
M. E. Atlaskina ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Imidazolium Ionic Liquids ◽  
Polymer Supports

Evaluation of catalytic activity of two functionalized imidazolium ionic liquids for biodiesel fuel production by a two-stage process

2013 ◽  
Vol 89 (7) ◽  
pp. 998-1006 ◽  
Author(s):  
Yasir A. Elsheikh ◽  
Zakaria Man ◽  
Azmi Bustam ◽  
Suzana Yusup ◽  
Faheem H. Akhtar ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Biodiesel Fuel ◽  
Fuel Production ◽  
Two Stage ◽  
Imidazolium Ionic Liquids ◽  
Stage Process

scholarly journals Ionic liquids - deanol derivatives as the Diels-Alder reaction solvents

2010 ◽  
Vol 8 (5) ◽  
pp. 1140-1146 ◽  
Author(s):  
Ewa Janus ◽  
Anna Syguda ◽  
Katarzyna Materna
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Acid Catalyst ◽  
Alder Reaction ◽  
Diels Alder ◽  
Reaction Yield ◽  
Catalytic Systems ◽  
Diels Alder Reaction ◽  
Lewis Acid Catalyst ◽  
Metal Triflates

AbstractThe Diels-Alder reaction between cyclopentadiene and dienophiles in deanol derivatives containing bis(trifluoromethylsulfonyl)imide anion as media have been studied. The effect of the substituents attached to the cation on the endo:exo selectivity as well as the reaction yield have been evaluated in the absence and presence of Lewis acid catalyst - Y(OTf)3. Catalytic activity of metal triflates and the recycling of chosen catalytic systems have also been investigated

scholarly journals Immobilizing Polyether Imidazole Ionic Liquids on ZSM-5 Zeolite for the Catalytic Synthesis of Propylene Carbonate from Carbon Dioxide

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2710 ◽  
Author(s):  
Liying Guo ◽  
Xianchao Jin ◽  
Xin Wang ◽  
Longzhu Yin ◽  
Yirong Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Propylene Carbonate ◽  
Catalytic Performance ◽  
Catalytic Synthesis ◽  
Composite Catalyst ◽  
Thermal Stabilities ◽  
Immobilized Catalysts ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic

Traditional ionic liquids (ILs) catalysts suffer from the difficulty of product purification and can only be used in homogeneous catalytic systems. In this work, by reacting ILs with co-catalyst (ZnBr2), we successfully converted three polyether imidazole ionic liquids (PIILs), i.e., HO-[Poly-epichlorohydrin-methimidazole]Cl (HO-[PECH-MIM]Cl), HOOC-[Poly-epichlorohydrin-methimidazole]Cl (HOOC-[PECH-MIM]Cl), and H2N-[Poly-epichlorohydrin-methimidazole]Cl (H2N-[PECH-MIM]Cl), to three composite PIIL materials, which were further immobilized on ZSM-5 zeolite by chemical bonding to result in three immobilized catalysts, namely ZSM-5-HO-[PECH-MIM]Cl/[ZnBr2], ZSM-5-HOOC-[PECH-MIM]Cl/[ZnBr2], and ZSM-5-H2N-[PECH-MIM]Cl/[ZnBr2]. Their structures, thermal stabilities, and morphologies were fully characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The amount of composite PIIL immobilized on ZSM-5 was determined by elemental analysis. Catalytic performance of the immobilized catalysts was evaluated through the catalytic synthesis of propylene carbonate (PC) from CO2 and propylene oxide (PO). Influences of reaction temperature, time, and pressure on catalytic performance were investigated through the orthogonal test, and the effect of catalyst circulation was also studied. Under an optimal reaction condition (130 °C, 2.5 MPa, 0.75 h), the composite catalyst, ZSM-5-HOOC- [PECH-MIM]Cl/[ZnBr2], exhibited the best catalytic activity with a conversion rate of 98.3% and selectivity of 97.4%. Significantly, the immobilized catalyst could still maintain high heterogeneous catalytic activity even after being reused for eight cycles.

Catalytic Activity of Binary and Triple Systems Based on Redox Inactive Metal Compound, LiSt and Additives of Monodentate Ligands-Modifiers: DMF, HMPA and PhOH, in Selective Ethylbenzene Oxidation with Dioxygen

2016 ◽  
Vol 10 (3) ◽  
pp. 259-270
Author(s):  
Ludmila Matienko ◽  
◽  
Larisa Mosolova ◽  
Vladimir Binyukov ◽  
Gennady Zaikov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Triple System ◽  
Metal Compound ◽  
Ethylbenzene Oxidation ◽  
Catalytic Systems ◽  
Triple Systems ◽  
Lithium Compound ◽  
Mechanism Of Catalysis ◽  
Monodentate Ligands

Mechanism of catalysis with binary and triple catalytic systems based on redox inactive metal (lithium) compound {LiSt+L2} and {LiSt+L2+PhOH} (L2=DMF or HMPA), in the selective ethylbenzene oxidation by dioxygen into -phenylethyl hydroperoxide is researched. The results are compared with catalysis by nickel-lithium triple system {NiII(acac)2+LiSt+PhOH} in selective ethylbenzene oxidation to PEH. The role of H-bonding in mechanism of catalysis is discussed. The possibility of the stable supramolecular nanostructures formation on the basis of triple systems, {LiSt+L2+PhOH}, due to intermolecular H-bonds, is researched with the AFM method.

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

Hydrogen peroxide decomposition on a two-component CuO-Cr2O3 catalyst

1988 ◽  
Vol 53 (8) ◽  
pp. 1636-1646 ◽  
Author(s):  
Viliam Múčka ◽  
Kamil Lang
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Extreme Values ◽  
Catalytic Properties ◽  
Active Components ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Peroxide Decomposition ◽  
Two Component ◽  
Catalytically Active

Some physical and catalytic properties of the two-component copper(II)oxide-chromium(III)oxide catalyst with different content of both components were studied using the decomposition of the aqueous solution of hydrogen peroxide as a testing reaction. It has been found that along to both basic components, the system under study contains also the spinel structure CuCr2O4, chromate washable by water and hexavalent ions of chromium unwashable by water. The soluble chromate is catalytically active. During the first period of the reaction the equilibrium is being established in both homogeneous and heterogeneous catalytic systems. The catalytic activity as well as the specific surface area of the washed solid is a non-monotonous function of its composition. It seems highly probable that the extreme values of both these quantities are not connected with the detected admixtures in the catalytic system. The system under study is very insensitive with regard to the applied doses of gamma radiation. Its catalytic properties are changed rather significantly after the thermal treatment and particularly after the partial reduction to low degree by hydrogen. The observed changes of the catalytic activity of the system under study are very probably in connection with the changes of the valence state of the catalytically active components of the catalyst.

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