p-Toluenesulfonic acid functionalized imidazole ionic liquids encapsulated into bismuth SBA-16 as high-efficiency catalysts for Friedel–Crafts acylation reaction

2021 ◽  
Author(s):  
Guofang Gao ◽  
Qian Zhao ◽  
Cheng Yang ◽  
Tingshun Jiang
Keyword(s):  
Ionic Liquids ◽  
Acetic Anhydride ◽  
Mesoporous Materials ◽  
High Efficiency ◽  
Strong Acid ◽  
Acylation Reaction ◽  
Acid Properties ◽  
Composite Catalysts ◽  
Toluenesulfonic Acid

Four imidazole ionic liquids acidified with p-toluenesulfonic acid were loaded on Bi-SBA-16 mesoporous materials to obtain four composite catalysts with strong acid properties. They were applied to acylation reaction of anisole and acetic anhydride.

scholarly journals Unusual Reaction of Azoxybenzenes withp-Toluenesulfonic Acid in Acetic Anhydride

1982 ◽  
Vol 55 (5) ◽  
pp. 1538-1542 ◽  
Author(s):  
Ichiro Shimao ◽  
Ken Fujimori ◽  
Shigeru Oae
Keyword(s):  
Acetic Anhydride ◽  
Unusual Reaction ◽  
Toluenesulfonic Acid

Separation of phenols from oils using deep eutectic solvents and ionic liquids

2020 ◽  
Vol 92 (10) ◽  
pp. 1717-1731
Author(s):  
Yucui Hou ◽  
Zhi Feng ◽  
Jaime Ruben Sossa Cuellar ◽  
Weize Wu
Keyword(s):  
Ionic Liquids ◽  
Phenolic Compounds ◽  
High Efficiency ◽  
Deep Eutectic Solvents ◽  
Environmentally Benign ◽  
Organic Chemical ◽  
Environmental Friendliness ◽  
Oil Mixtures ◽  
Organic Chemical Industry

AbstractPhenolic compounds are important basic materials for the organic chemical industry, such as pesticides, medicines and preservatives. Phenolic compounds can be obtained from biomass, coal and petroleum via pyrolysis and liquefaction, but they are mixtures in oil. The traditional methods to separate phenols from oil using alkaline washing are not environmentally benign. To solve the problems, deep eutectic solvents (DESs) and ionic liquids (ILs) have been developed to separate phenols from oil, which shows high efficiency and environmental friendliness. In this article, we summarized the properties of DESs and ILs and the applications of DESs and ILs in the separation of phenols and oil. There are two ways in which DESs and ILs are used in these applications: (1) DESs formed in situ using different hydrogen bonding acceptors including quaternary ammonium salts, zwitterions, imidazoles and amides; (2) DESs and ILs used as extractants. The effect of water on the separation, mass transfer dynamics in the separation process, removal of neutral oil entrained in DESs, phase diagrams of phenol + oil + extractant during extraction, are also discussed. In the last, we analyze general trends for the separation and evaluate the problematic or challenging aspects in the separation of phenols from oil mixtures.

scholarly journals Catalytic oxidation of toluene by ozone in the system "acetic anhydride–strong acid"

2021 ◽  
pp. 106-111
Author(s):  
E.V. Potapenko ◽  
◽  
P.Y. Andreev ◽  
I.P. Isayenko ◽  
N.S. Andreeva
Keyword(s):  
Transition Metals ◽  
Acetic Anhydride ◽  
Kinetic Parameters ◽  
Catalytic Oxidation ◽  
Decisive Role ◽  
Strong Acid ◽  
Oxidation Products ◽  
Substrate Conversion ◽  
High Degree ◽  
Strong Acids

The process of catalytic oxidation of toluene by ozone in the solution of a mixture "acetic anhydride–a strong acid" has been studied in the presence of compounds of transition metals. It is shown that the main oxidation products in the system Mn(Ac)2–(СН3СО)2О–Н2SO4 at 200C are benzylacetate and benzylidene diacetate with the yields of 39% and 29%, respectively. In the system Со(Ac)2–(СН3СО)2О–НА, the reaction is accompanied mainly by the formation of benzylidene diacetate (68.0%) and the yield of benzylacetate does not exceed 4.0%. The kinetic parameters of the main stages of the catalytic cycle were investigated. It was found that strong acids play a decisive role in increasing the activity of oxidized forms of the metal. Under the conditions of activation by strong acids, the reaction of methylbenzene with Me3+ occurs with a high degree of substrate conversion. It was found that the reduction of Me3+ in the reaction with the solvent becomes noticeable, along with the oxidation of toluene, with increasing the concentration of strong acids. It was stated that the selective oxidation of toluene under catalysis is initiated by the reaction with an oxidized form of the metal formed by the interaction of ozone with the catalyst.

scholarly journals Radially oriented mesoporous TiO2 microspheres with single-crystal–like anatase walls for high-efficiency optoelectronic devices

2015 ◽  
Vol 1 (4) ◽  
pp. e1500166 ◽  
Author(s):  
Yong Liu ◽  
Renchao Che ◽  
Gang Chen ◽  
Jianwei Fan ◽  
Zhenkun Sun ◽  
...  
Keyword(s):  
Single Crystal ◽  
Mesoporous Materials ◽  
High Performance ◽  
High Efficiency ◽  
Dye Sensitized Solar Cells ◽  
Building Blocks ◽  
Accessible Surface Area ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Assembly Method

Highly crystalline mesoporous materials with oriented configurations are in demand for high-performance energy conversion devices. We report a simple evaporation-driven oriented assembly method to synthesize three-dimensional open mesoporous TiO2 microspheres with a diameter of ~800 nm, well-controlled radially oriented hexagonal mesochannels, and crystalline anatase walls. The mesoporous TiO2 spheres have a large accessible surface area (112 m2/g), a large pore volume (0.164 cm3/g), and highly single-crystal–like anatase walls with dominant (101) exposed facets, making them ideal for conducting mesoscopic photoanode films. Dye-sensitized solar cells (DSSCs) based on the mesoporous TiO2 microspheres and commercial dye N719 have a photoelectric conversion efficiency of up to 12.1%. This evaporation-driven approach can create opportunities for tailoring the orientation of inorganic building blocks in the assembly of various mesoporous materials.

TiO2 nanotube arrays grown in ionic liquids: high-efficiency in photocatalysis and pore-widening

2011 ◽  
Vol 21 (26) ◽  
pp. 9487 ◽  
Author(s):  
Huaqing Li ◽  
Jun Qu ◽  
Qingzhou Cui ◽  
Hanbing Xu ◽  
Huimin Luo ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
High Efficiency ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Pore Widening

scholarly journals Fabrication of Bifunctional TiO2/POM Microspheres Using a Layer-by-Layer Method and Photocatalytic Activity for Methyl Orange Degradation

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Ping Niu ◽  
Dunqing Wang ◽  
Aili Wang ◽  
Yuhua Liang ◽  
Xinfang Wang
Keyword(s):  
Methyl Orange ◽  
High Efficiency ◽  
Catalyst Concentration ◽  
Magnetic Microspheres ◽  
Layer By Layer ◽  
Methyl Orange Degradation ◽  
X Ray ◽  
First Order ◽  
Composite Catalysts ◽  
Layer Method

Bifunctional films of Keggin-type polyoxometalates H3PW12O40 (PW12), H4SiW12O40 (SiW12), H3PMo12O40 (PMo12), and TiO2 were successfully built on Fe3O4@SiO2 microspheres using a layer-by-layer method. The characterization by field emission scan electronic microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX) shows that TiO2 nanoparticles and polyoxometalate (POM) anions are successfully assembled. The photodegradation of methyl orange (MO) was used to test the photocatalytic efficiency of magnetic catalysts under UV irradiation. For MO decomposition, multilayer films that combine PW12 and SiW12 with TiO2 show high efficiency, which can be attributed to the synergistic effect between POMs and TiO2. The degradation of the model contaminant was also systematically checked under different conditions such as bilayer number deposited on magnetic microspheres, catalyst concentration, inorganic oxidants, and salts. The oxidation process of MO follows an apparent first-order reaction. Furthermore, the composite catalysts deposited on Fe3O4@SiO2 magnetic microspheres can be conveniently, quickly, and efficiently separated by an external magnet from a solution.

Amphoteric water as acid and base for protic ionic liquids and their electrochemical activity when used as fuel cell electrolytes

2018 ◽  
Vol 206 ◽  
pp. 353-364 ◽  
Author(s):  
Muhammed Shah Miran ◽  
Tomohiro Yasuda ◽  
Ryoichi Tatara ◽  
Md. Abu Bin Hasan Susan ◽  
Masayoshi Watanabe
Keyword(s):  
Ionic Liquids ◽  
Fuel Cell ◽  
Strong Acid ◽  
Trifluoromethanesulfonic Acid ◽  
Electrochemical Activity ◽  
Protic Ionic Liquids ◽  
Strong Base ◽  
Acid And Base ◽  
Cell Electrolytes ◽  
Fuel Cell Electrolytes

Amphoteric water was mixed with equimolar amounts of a super-strong acid, trifluoromethanesulfonic acid (TfOH), and a super-strong base, 1,8-diazabicyclo-[5.4.0]-7-undecene (DBU) to explore the properties as fuel cell electrolytes.

Synthesis of Functional Ionic Liquids by Thermal Heating and Ultrasonic-Assisted Methods

2012 ◽  
Vol 581-582 ◽  
pp. 326-329
Author(s):  
Zhe Zhang ◽  
Yi He Li ◽  
Hua Xiao ◽  
Chi Zhou Tu ◽  
Chun Hua Wang
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Mild Condition ◽  
High Efficiency ◽  
Ester Group ◽  
Synthesis Condition ◽  
Synthesis Methods ◽  
Thermal Heating ◽  
Heating Method ◽  
Ultrasonic Assisted

1-(2-Methacryloyloxy)ethyl-3-butylimidazolium bromide, a kind of functional ionic liquid containing ester group, was synthesized by two synthesis methods, denoted as thermal heating method and ultrasonic-assisted method. The optimal synthesis condition of the thermal heating method is discussed. Comparison of the two methods shows that ultrasound significantly enhances the efficiency of the reaction. The ultrasonic-assisted method is quite promising in synthesis of ionic liquids with mild condition and high efficiency.

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