Glycerol Esterification to Glyceryl Diacetate over SO 4 2− /W‐Zr Complex Solid Super Acid Catalysts

2019 ◽  
Vol 4 (9) ◽  
pp. 2780-2786
Author(s):  
Qifeng Lei ◽  
Duo Li ◽  
Ji‐Fan Li ◽  
Chun‐Ling Liu ◽  
Chunli Xu ◽  
...  
Keyword(s):  
Acid Catalysts ◽  
Super Acid ◽  
Glycerol Esterification

Benign by Molecular Design: Active Polymeric Super-Acid Catalysts and Highly Conductive Polymeric Lithium Electrolytes

2003 ◽  
Vol 115 (44) ◽  
pp. 5620-5622
Author(s):  
Zhen-Yu Yang ◽  
Lin Wang ◽  
N. Drysdale ◽  
Marc Doyle ◽  
Qun Sun ◽  
...  
Keyword(s):  
Molecular Design ◽  
Acid Catalysts ◽  
Super Acid

Mesoporous phosphated and sulphated silica as solid acid catalysts for glycerol acetylation

2014 ◽  
Vol 68 (9) ◽  
Author(s):  
Khadijeh Ghoreishi ◽  
Nilofar Asim ◽  
Mohd Yarmo ◽  
Mohd Samsudin
Keyword(s):  
Photoelectron Spectroscopy ◽  
Solid Acid ◽  
Sol Gel ◽  
Acid Catalysts ◽  
X Ray ◽  
Bet Method ◽  
Ft Ir ◽  
Temperature Programmed ◽  
Catalyst Acidity ◽  
Glycerol Esterification

AbstractSulphate- and phosphate-loaded silicas were synthesised using the sol-gel method with different sulphate and phosphate loadings. These catalysts were characterised using Fourier transform infrared spectroscopy (FT-IR), the Brunauer-Emmett-Teller (BET) method and X-ray photoelectron spectroscopy (XPS). Acidity was measured using the temperature-programmed desorption of ammonia (TPD-NH3) method. The results showed that glycerol esterification with acetic acid conversion decreased as follows: α(H2SO4) (100 %) > α(H3PO4) (99 %) > α(silica loaded with 20 % sulphuric acid) (SS-20; 98 %) > α(silica loaded with 20 % phosphoric acid) (PS-20; 83 %). These studies suggest that the solid acid catalytic activity in the esterification of glycerol is highly dependent on catalyst acidity strength, pore size and surface area.

Synthesis and Characterisation of Ordered Mesoporous Acid Catalysts for Synthesis of Biodegradable Surfactants

2003 ◽  
Vol 68 (10) ◽  
pp. 1914-1926 ◽  
Author(s):  
Marcelo Boveri ◽  
Javier Agúndez ◽  
Isabel Díaz ◽  
Joaquín Pérez-Pariente ◽  
Enrique Sastre
Keyword(s):  
Catalytic Activity ◽  
Hydrothermal Synthesis ◽  
Stearic Acid ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Synthesis Time ◽  
Ordered Mesoporous ◽  
Glycerol Esterification ◽  
Mcm 41

Solid acid catalysts based on -SO3H-grafted MCM-41 mesoporous silica were prepared as catalysts for the synthesis of biodegradable surfactants leading reactions. The influence of hydrothermal synthesis time on properties of the mesoporous matrix and catalytic activity and selectivity of the catalysts in the stearic acid-glycerol esterification were studied.

scholarly journals Isomerization of Hexane Catalyzed by Friedel-Crafts and Solid Super Acid Catalysts.

1984 ◽  
Vol 38b ◽  
pp. 55-61 ◽  
Author(s):  
Michael Stöcker ◽  
Bjørn Petter Nilsen ◽  
Lassi Hiltunen ◽  
Albert Dorfman ◽  
William B. Upholt ◽  
...  
Keyword(s):  
Acid Catalysts ◽  
Super Acid

Benign by Molecular Design: Active Polymeric Super-Acid Catalysts and Highly Conductive Polymeric Lithium Electrolytes

2003 ◽  
Vol 42 (44) ◽  
pp. 5462-5464 ◽  
Author(s):  
Zhen-Yu Yang ◽  
Lin Wang ◽  
N. Drysdale ◽  
Marc Doyle ◽  
Qun Sun ◽  
...  
Keyword(s):  
Molecular Design ◽  
Acid Catalysts ◽  
Super Acid

Hydrolysis of Dimethyl Ether over Heteropoly Acids Catalyst

2012 ◽  
Vol 550-553 ◽  
pp. 114-118
Author(s):  
Yong Xiu Li ◽  
Chang Jiang Yu ◽  
Chao Xian Wang ◽  
Longnian Ou ◽  
Yi Bing Song
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Dimethyl Ether ◽  
Phosphotungstic Acid ◽  
Heteropoly Acids ◽  
High Catalytic Activity ◽  
Acid Catalysts ◽  
Different Types ◽  
Super Acid ◽  
Hydrolysis Of

Heteropoly acide(HPA), as one kind of solid-super acid catalysts, has been researched and applied extensively. Using SBA-15 and ZSM-5 as carriers, HPA catalysts with different types and contents were applied in this work for the hydrolysis of dimethyl ether(DME). It had been found that ZSM-5 was a proper carrier, and its supported phosphotungstic acid exhibited relatively high catalytic activity in this low-temperature hydrolysis reaction.

Synthesis and characterization of solid-phase super acid catalysts and their application for isomerization of n-alkanes

2017 ◽  
Vol 204 (12) ◽  
pp. 1341-1356 ◽  
Author(s):  
Abhishek Dhar ◽  
Abhishek Dutta ◽  
Pushan Sharma ◽  
Biswajit Panda ◽  
Subhasis Roy
Keyword(s):  
Solid Phase ◽  
Synthesis And Characterization ◽  
Acid Catalysts ◽  
Super Acid

Urea-Catalyzed Functionalization of Unactivated C–H Bonds

2020 ◽  
Author(s):  
Alex L. Bagdasarian ◽  
Stasik Popov ◽  
Benjamin Wigman ◽  
Wenjing Wei ◽  
woojin lee ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Organic Synthesis ◽  
High Energy ◽  
Acid Catalysts ◽  
Potential Utility ◽  
New Paradigm ◽  
Lewis Acid Catalysts ◽  
Reaction Conditions ◽  
Highly Active ◽  
Acidic Nature

Herein we report the 3,5bistrifluoromethylphenyl urea-catalyzed functionalization of unactivated C–H bonds. In this system, the urea catalyst mediates the formation of high-energy vinyl carbocations that undergo facile C–H insertion and Friedel–Crafts reactions. We introduce a new paradigm for these privileged scaffolds where the combination of hydrogen bonding motifs and strong bases affords highly active Lewis acid catalysts capable of ionizing strong C–O bonds. Despite the highly Lewis acidic nature of these catalysts that enables triflate abstraction from sp<sup>2</sup> carbons, these newly found reaction conditions allow for the formation of heterocycles and tolerate highly Lewis basic heteroaromatic substrates. This strategy showcases the potential utility of dicoordinated vinyl carbocations in organic synthesis.<br>

Urea-Catalyzed Functionalization of Unactivated C–H Bonds

2020 ◽  
Author(s):  
Alex L. Bagdasarian ◽  
Stasik Popov ◽  
Benjamin Wigman ◽  
Wenjing Wei ◽  
woojin lee ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Organic Synthesis ◽  
High Energy ◽  
Acid Catalysts ◽  
Potential Utility ◽  
New Paradigm ◽  
Lewis Acid Catalysts ◽  
Reaction Conditions ◽  
Highly Active ◽  
Acidic Nature

Herein we report the 3,5bistrifluoromethylphenyl urea-catalyzed functionalization of unactivated C–H bonds. In this system, the urea catalyst mediates the formation of high-energy vinyl carbocations that undergo facile C–H insertion and Friedel–Crafts reactions. We introduce a new paradigm for these privileged scaffolds where the combination of hydrogen bonding motifs and strong bases affords highly active Lewis acid catalysts capable of ionizing strong C–O bonds. Despite the highly Lewis acidic nature of these catalysts that enables triflate abstraction from sp<sup>2</sup> carbons, these newly found reaction conditions allow for the formation of heterocycles and tolerate highly Lewis basic heteroaromatic substrates. This strategy showcases the potential utility of dicoordinated vinyl carbocations in organic synthesis.<br>

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