scholarly journals Coating of Pd/C catalysts with Lewis-acidic ionic liquids and liquid coordination complexes – SCILL induced activity enhancement in arene hydrogenation

RSC Advances ◽  
2017 ◽  
Vol 7 (44) ◽  
pp. 27558-27563 ◽  
Author(s):  
Martin Lijewski ◽  
James M. Hogg ◽  
Małgorzata Swadźba-Kwaśny ◽  
Peter Wasserscheid ◽  
Marco Haumann
Keyword(s):  
Ionic Liquids ◽  
Coordination Complexes ◽  
Liquid Films ◽  
Reaction Conditions ◽  
Hydrogenation Activity ◽  
Acidic Ionic Liquids ◽  
Arene Hydrogenation ◽  
Activity Enhancement

Acid doping – coating of Pd/C catalysts with Lewis-acidic liquid films results in increased hydrogenation activity at very mild reaction conditions.

Synthesis of Symmetric Ethers Using Monocationic and Dicationic Acidic Ionic Liquids

2018 ◽  
Vol 762 ◽  
pp. 104-108
Author(s):  
Ance Eglīte ◽  
Linda Pudnika ◽  
Marta Anda Balode ◽  
Anda Prikšāne
Keyword(s):  
Ionic Liquids ◽  
Thermal Properties ◽  
Alkylating Agents ◽  
Dehydration Reaction ◽  
Reaction Conditions ◽  
Acidic Ionic Liquids ◽  
Dicationic Ionic Liquids ◽  
High Yields ◽  
Long Chain

A series of monocationic and dicationic -SO3H functionalized Brønsted acidic ionic liquids (BAILs) are synthesized using different amines int.al., N,N,N′,N′-tetramethylethylenediamine, 1-methylimidazole, pyridine and alkylating agents 1,3-propane- and 1,4-butanesultones. The Hammett acidity (H0) and thermal properties by TG-DSC techniques are investigated. These ionic liquids have been applied to catalyze the dehydration reaction of aliphatic long chain alcohols (1-heptanol, 1-octanol, 1-decanol) at 195 °C. The optimization of reaction conditions and use of dicationic ionic liquids allow to reach rather high yields of symmetric diheptyl ether and dioctyl ether. The reusability of ionic liquids is evaluated using monocationic [PyPS][HSO4], dicationic [TMEDAPS][HSO4] ionic liquids and 1-heptanol.

Efficient cyclodehydration of diethylene glycol in Brønsted acidic ionic liquids

2008 ◽  
Vol 62 (3) ◽  
Author(s):  
Yuan-Yuan Wang ◽  
Wei Li ◽  
Li-Yi Dai
Keyword(s):  
Ionic Liquids ◽  
Diethylene Glycol ◽  
Molar Ratio ◽  
Temperature Reaction ◽  
Hydrogen Sulfate ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Catalytic Activities ◽  
Acidic Ionic Liquids ◽  
First Time

AbstractCyclodehydration of diethylene glycol using various Brønsted acidic ionic liquids as dual solvent-catalysts has been studied for the first time. Better results were obtained in the presence of 1-butyl-3-methylimidazolium hydrogen sulfate ([PSmim]HSO4) compared with other Brønsted acidic ionic liquids. Effects of the reaction conditions such as reaction temperature, reaction time and molar ratio of ionic liquid to diethylene glycol have been investigated. High diethylene glycol conversion, 97.0 %, and high 1,4-dioxane selectivity, 89.3 %, were obtained in [PSmim]HSO4 under optimum conditions. Hammett method was used to determine the acidity order of these ionic liquids and the results were consistent with the catalytic activities observed in the cyclodehydration reaction. Utilization of Brønsted acidic ionic liquids as dual solvent-catalysts has some advantages, e.g. high conversion of DEG, easy preparation and reuse of ionic liquids, avoiding toxic catalysts and solvents.

One Step Synthesis of ε-Caprolactam from Cyclohexanone and Hydroxylamine Catalyzed by SO3H-Functioned Ionic Liquids

2013 ◽  
Vol 734-737 ◽  
pp. 2128-2131
Author(s):  
He Fang Wang ◽  
Hong Tao Liu ◽  
Li Yuan Jia ◽  
Yuan Yuan Wang ◽  
Yan Ji Wang
Keyword(s):  
Ionic Liquids ◽  
Reaction Medium ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Acidic Ionic Liquids ◽  
One Step ◽  
Optimal Reaction

One step synthesis of ε-caprolactam from cyclohexanone and hydroxylamine used acidic ionic liquids [HSO3-b-N(CH3)HSO4 as reaction medium and catalyst were investigated. Reaction conditions were investigated to obtain the optimum conditions. The results indicate that the yield of CPO is 35.9% and the yield of CPL is 20.4% under optimal reaction conditions.

Kinetics Study of the Esterification of Acetic Acid with Methanol using Low-Corrosive Brønsted Acidic Ionic Liquids as Catalysts

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Duan-Jian Tao ◽  
Xiao-Liang Zhang ◽  
Na Hu ◽  
Zhang-Min Li ◽  
Xiang-Shu Chen
Keyword(s):  
Acetic Acid ◽  
Ionic Liquids ◽  
Molar Ratio ◽  
Catalyst Loading ◽  
Reaction Conditions ◽  
Catalytic Distillation ◽  
Kinetic Information ◽  
Acidic Ionic Liquids ◽  
Catalyst Type ◽  
Optimal Reaction

The kinetics for the esterification of acetic acid with methanol was studied systemically in the presence of low-corrosive Brønsted acidic ionic liquids (BAILs) as catalysts. The effect of various parameters such as catalyst type, agitation speed, temperature, catalyst loading, and molar ratio of the reactants on the conversion of acidic acid was studied in detail to obtain the optimal reaction conditions. Moreover, the pseudo-homogeneous (PH) kinetic model was utilized successfully to correlate the experimental data in the temperature range from 323.15 to 343.15 K. Thus, a complete kinetic equation for describing this esterification system was developed that provides to obtain the kinetic information for the simulation and design of catalytic distillation column in the synthesis of methyl acetate.

Degradation of polylactide using basic ionic liquid imidazolium acetates

2014 ◽  
Vol 68 (10) ◽  
Author(s):  
Xiao-Yang Li ◽  
Qian Zhou ◽  
Ke-Ke Yang ◽  
Yu-Zhong Wang
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Atmospheric Pressure ◽  
High Efficiency ◽  
Side Chain ◽  
Reaction Conditions ◽  
Imidazolium Cations ◽  
Basic Ionic Liquid ◽  
Acidic Ionic Liquids ◽  
Degradation Degree

AbstractImidazolium acetate ionic liquids show high efficiency in the degradation of polylactides (PLA): degradation degree of PLA can reach almost 100 % in imidazolium acetate ionic liquids at 170°C and 1 h under atmospheric pressure, while the degradation degree of PLA remains close to 0 % using neutral 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) and acidic ionic liquids at the same reaction conditions. With the increase of both the amount of acetate ionic liquid and the reaction temperature, the degradation degree of PLA increases. The structure of ionic liquids affects the degradation behavior of PLA: for cations, the proton from the C-2 position on the imidazolium ring is involved in the degradation of PLA; the degradation of PLA increases with the increase of the alkyl side-chain length of imidazolium cations; for anions, moderate basicity of the acetate ion contributes to the high activity of the imidazolium acetate ionic liquids in the degradation of PLA.

N,N,N′,N′-Tetramethylethylene-diaminium-N,N′-disulfonic acid trifluoroacetate and pyridinium-N-sulfonic acid hydrogen sulfate as highly effective dual-functional catalysts for the preparation of N,N′-alkylidene bisamides

2019 ◽  
Vol 74 (9) ◽  
pp. 641-647 ◽  
Author(s):  
Zahra Kordrostami ◽  
Abdolkarim Zare ◽  
Mostafa Karami
Keyword(s):  
Ionic Liquids ◽  
Sulfonic Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
Disulfonic Acid ◽  
Hydrogen Sulfate ◽  
Reaction Conditions ◽  
Dual Functional ◽  
Solvent Free Conditions ◽  
Acidic Ionic Liquids

AbstractIn this research, Brønsted-acidic ionic liquids N,N,N′,N′-tetramethylethylene-diaminium-N,N′-disulfonic acid trifluoroacetate ([TMEDSA][TFA]2) and pyridinium-N-sulfonic acid hydrogen sulfate ([Py-SO3H][HSO4]) have been introduced as dual-functional catalysts for the green, simple and effective preparation of N,N′-alkylidene bisamides by the reaction of primary amides (2 eq.) with arylaldehydes (1 eq.) under solvent-free conditions. The reaction results and conditions of the catalysts have been compared with the previously reported ones. [TMEDSA][TFA]2 and [Py-SO3H][HSO4] were superior to the previously reported catalysts in terms of two or more of these factors: reaction times (10–45 min), yields (86–98%), temperature and the reaction conditions. Additionally, a plausible and attractive mechanism based on dual functionality of the catalysts has been proposed.

Acidic Ionic Liquids Enabling Intermediate Temperature Operation Fuel Cells

2021 ◽  
Vol 13 (7) ◽  
pp. 8370-8382
Author(s):  
Hui Hou ◽  
Hanno Maria Schütz ◽  
Jürgen Giffin ◽  
Klaus Wippermann ◽  
Xinpei Gao ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Fuel Cells ◽  
Intermediate Temperature ◽  
Acidic Ionic Liquids

Brønsted Acidic Ionic Liquids as Efficient Catalysts for the Synthesis of Amidoalkyl Naphthols

2010 ◽  
Vol 41 (2) ◽  
pp. 298-306 ◽  
Author(s):  
M. M. Heravi ◽  
N. Tavakoli-Hoseini ◽  
F. F. Bamoharram
Keyword(s):  
Ionic Liquids ◽  
Amidoalkyl Naphthols ◽  
Acidic Ionic Liquids
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