Zeolitic Imidazolate Frameworks ZIF-8 and MAF-5 as Highly Efficient Heterogeneous Catalysts for Synthesis of 1-Methoxy-2-propanol from Methanol and Propylene Oxide

2019 ◽  
Vol 58 (25) ◽  
pp. 10750-10758 ◽  
Author(s):  
Maria N. Timofeeva ◽  
Ivan A. Lykoyanov ◽  
Valentina N. Panchenko ◽  
Kristina I. Shefer ◽  
Biswa Nath Bhadra ◽  
...  
Keyword(s):  
Propylene Oxide ◽  
Heterogeneous Catalysts ◽  
Zeolitic Imidazolate Frameworks ◽  
Highly Efficient

scholarly journals Effect of MAF-6 Crystal Size on Its Physicochemical and Catalytic Properties in the Cycloaddition of CO2 to Propylene Oxide

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1061
Author(s):  
Maria N. Timofeeva ◽  
Ivan A. Lukoyanov ◽  
Valentina N. Panchenko ◽  
Biswa Nath Bhadra ◽  
Evgenii Yu Gerasimov ◽  
...  
Keyword(s):  
Particle Size ◽  
Propylene Oxide ◽  
Active Sites ◽  
Heterogeneous Catalysts ◽  
Binary Systems ◽  
Crystal Size ◽  
Tetrabutylammonium Bromide ◽  
Textural Properties ◽  
Similar Reaction ◽  
Zeolitic Imidazolate Frameworks

Zeolitic imidazolate frameworks MAF-5 and MAF-6 based on Zn2+ and 2-ethylimidazole were demonstrated to be efficient heterogeneous catalysts in solvent-free coupling of CO2 and propylene oxide (PO) to produce propylene carbonate (PC) at 0.8 MPa of CO2 and 80 °C. Activity of MAF-5 was lower in comparison with MAF-6 due to the difference in their structural and textural characteristics. MAF-6 samples with particle size of 190 ± 20, 360 ± 30, and 810 ± 30 nm were prepared at room temperature from [Zn(NH3)4](OH)2 and 2-ethylimidazole. Control of particle size was achieved by variation of type of alcohol in alcohol/cyclohexane media for the preparation of MAF-6. According to this comprehensive study, the yield of PC was found to decrease with increasing crystal size of the MAF-6 material, which was related to the change in textural properties and the number and localization of active sites. The combination of MAF-6 with particle size of with particle size of 190 ± 20 nm and tetrabutylammonium bromide ([n-Bu4N]Br) as co-catalyst led to an approximately 4-fold enhancement in the yield of PC (80.5%). Compared with reported ZIFs catalysts, the efficiencies of MAF-5/[n-Bu4N]Br and MAF-6/[n-Bu4N]Br binary systems were comparable and higher under similar reaction conditions.

Preformed Au colloidal nanoparticles immobilised on NiO as highly efficient heterogeneous catalysts for reduction of 4-nitrophenol to 4-aminophenol

2019 ◽  
Vol 7 (5) ◽  
pp. 103381 ◽  
Author(s):  
Davide Motta ◽  
Felipe Sanchez ◽  
Khaled Alshammari ◽  
Lidia E. Chinchilla ◽  
Gianluigi A. Botton ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Colloidal Nanoparticles ◽  
Highly Efficient

Ionic Liquid [Bmim]OH Grafted Catalyst for Cycloaddition of Carbon Dioxide

2014 ◽  
Vol 989-994 ◽  
pp. 676-679 ◽  
Author(s):  
Xue Lan Zhang ◽  
Deng Feng Wang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Silica Gel ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
Heterogeneous Catalysts ◽  
Element Analysis ◽  
Mild Conditions ◽  
Adsorption Desorption

An ionic liquid 1-butyl-3-methylimidazolium hydroxide ([Bmim]OH) was grafted on silica gel by post-grafting method. Such grafted ionic liquids (GILs) which were verified by means of FTIR, element analysis N2adsorption-desorption and TG could be used as highly effective heterogeneous catalysts toward propylene carbonate synthesis through cycloaddition of carbon dioxide with propylene oxide under solventless and mild conditions.

scholarly journals Heterogeneous catalysis with encapsulated haem and other synthetic porphyrins: Harnessing the power of porphyrins for oxidation reactions

2018 ◽  
Vol 16 (1) ◽  
pp. 763-789 ◽  
Author(s):  
Nicola A. Dare ◽  
Timothy J. Egan
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalysis ◽  
Heterogeneous Catalysts ◽  
Organic Substrates ◽  
Oxidation Reactions ◽  
Highly Efficient ◽  
Protein Environment

AbstractEncapsulated metalloporphyrins have been widely studied for their use as efficient heterogeneous catalysts, inspired by the known catalytic activity of porphyrins in haemoproteins. The oxidation of organic substrates by haemoproteins is one of the well-known roles of these proteins, in which the haem (ferriprotoporphyrin IX = FePPIX) cofactor is the centre of reactivity. While these porphyrins are highly efficient catalysts in the protein environment, once removed, they quickly lose their reactivity. It is for this reason that they have garnered much interest in the field of heterogeneous catalysis of oxidation reactions. This review details current research in the field, focusing on the application of encapsulated haem, and other synthetic metalloporphyrins, applied to oxidation reactions.

Preparation and Activity of Ionic Liquid Catalysts Grafted on Hydrophobic Silica Gel

2012 ◽  
Vol 476-478 ◽  
pp. 2621-2624
Author(s):  
Xue Lan Zhang ◽  
Deng Feng Wang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Silica Gel ◽  
Propylene Oxide ◽  
Heterogeneous Catalysts ◽  
N2 Adsorption ◽  
Mild Conditions ◽  
Hydrophobic Silica ◽  
Adsorption Desorption

An ionic liquid 1- (triethoxysilyl) propyl-3-methylimidazolium hydroxide ([Smim]OH) was grafted on three kinds of mesoporous hydrophobic silica gel by means of post-grafting under mild conditions. The catalysts were [Smim]OH/SiO2-MTES (methyltriethoxysilane), [Smim]OH/SiO2-TMCS (trimethylchlorosilane), [Smim]OH/SiO2-CPTEO (triethoxysilyl propyl chloride). Such grafted ionic liquids (GILs), which were characterized by means of FTIR and N2 adsorption-desorption could be used as effective heterogeneous catalysts toward propylene carbonate synthesis through cycloaddition of carbon dioxide with propylene oxide under solventless and mild conditions.

scholarly journals Highly Efficient and Selective Transformations of Glycerol Using Reusable Heterogeneous Catalysts

2014 ◽  
Vol 2 (4) ◽  
pp. 574-578 ◽  
Author(s):  
Tomoo Mizugaki ◽  
Racha Arundhathi ◽  
Takato Mitsudome ◽  
Koichiro Jitsukawa ◽  
Kiyotomi Kaneda
Keyword(s):  
Heterogeneous Catalysts ◽  
Highly Efficient
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