Sulfonic acid-functionalized core-shell Fe3O4@carbon microspheres as magnetically recyclable solid acid catalysts

2020 ◽  
Author(s):  
Chenyi Yuan ◽  
Xiqing Wang ◽  
Xuanyu Yang ◽  
Abdulaziz A. Alghamdi ◽  
Fahad A. Alharthi ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Core Shell ◽  
Acid Catalysts ◽  
Carbon Microspheres

Preparation of Core-Shell Silica - 12-Tungstophosphoricacid Nanoparticles for Acylation of Aromatics

2013 ◽  
Vol 706-708 ◽  
pp. 219-223
Author(s):  
Hsiu Ling Hsu ◽  
Rosilda Selvin ◽  
L. Selva Roselin
Keyword(s):  
Liquid Phase ◽  
High Activity ◽  
Solid Acid ◽  
Coke Formation ◽  
Solid Acid Catalysts ◽  
Core Shell ◽  
Acid Catalysts ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles ◽  
Enhanced Selectivity

A variety of solid acid catalysts especially 12-Tungstophosphoricacid (DTP) supported on silica has been reported for the acylation of anisole, veratrole and toluene. However, the activity of this catalyst is susceptible to coke formation or poor activity. This paper reports the novelties of steam treated SiO2-DTP core-shell nanoparticles, which exhibits tremendous stability, high activity and enhanced selectivity in the liquid-phase acylation of anisole, veratrole and toluene as compared to conventional DTP supported on silica.

scholarly journals Pre-treatment of biomasses using magnetised sulfonic acid catalysts

2017 ◽  
Vol 48 (2) ◽  
pp. 117 ◽  
Author(s):  
Yane Ansanay ◽  
Praveen Kolar ◽  
Ratna Sharma-Shivappa ◽  
Jay Cheng ◽  
Sunkyu Park ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Panicum Virgatum ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Miscanthus Giganteus ◽  
Panicum Virgatum L ◽  
Pre Treatment

There is a significant interest in employing solid acid catalysts for pre-treatment of biomasses for subsequent hydrolysis into sugars, because solid acid catalysts facilitate reusability, high activity, and easier separation. Hence the present research investigated pretreatment of four lignocellulosic biomasses, namely Switchgrass (Panicum virgatum L ‘Alamo’), Gamagrass (Tripsacum dactyloides), Miscanthus (Miscanthus × giganteus) and Triticale hay (Triticale hexaploide Lart.) at 90°C for 2 h using three carbon-supported sulfonic acid catalysts. The catalysts were synthesized via impregnating p-Toluenesulfonic acid on carbon (regular) and further impregnated with iron nitrate via two methods to obtain magnetic A and magnetic B catalysts. When tested as pre-treatment agents, a maximum total lignin reduction of 17.73±0.63% was observed for Triticale hay treated with magnetic A catalyst. Furthermore, maximum glucose yield after enzymatic hydrolysis was observed to be 203.47±5.09 mg g–1 (conversion of 65.07±1.63%) from Switchgrass treated with magnetic A catalyst. When reusability of magnetised catalysts were tested, it was observed that magnetic A catalyst was consistent for Gamagrass, Miscanthus × Giganteus and Triticale hay, while magnetic B catalyst was found to maintain consistent yield for switchgrass feedstock. Our results suggested that magnetised solid acid catalyst could pre-treat various biomass stocks and also can potentially reduce the use of harsh chemicals and make bioenergy processes environment friendly.

Synthesis of sulfonic acid-functionalized Fe3O4@C nanoparticles as magnetically recyclable solid acid catalysts for acetalization reaction

2014 ◽  
Vol 43 (3) ◽  
pp. 1220-1227 ◽  
Author(s):  
Fang-Cai Zheng ◽  
Qian-Wang Chen ◽  
Lin Hu ◽  
Nan Yan ◽  
Xiang-Kai Kong
Keyword(s):  
Sulfonic Acid ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Acetalization Reaction

Conversion of fructose into 5-hydroxymethylfurfural catalyzed by recyclable sulfonic acid-functionalized metal–organic frameworks

2014 ◽  
Vol 16 (5) ◽  
pp. 2490-2499 ◽  
Author(s):  
Jinzhu Chen ◽  
Kegui Li ◽  
Limin Chen ◽  
Ruliang Liu ◽  
Xing Huang ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Solid Acid ◽  
Metal Organic Frameworks ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Metal Organic

Sulfonic acid-functionalized metal–organic frameworks are efficiently used as recyclable solid acid catalysts for the fructose-to-HMF transformation.

Novel Solid Acid Catalysts: Sulfonic Acid Group-Functionalized Mesostructured Polymers

2007 ◽  
Vol 17 (14) ◽  
pp. 2455-2461 ◽  
Author(s):  
R. Xing ◽  
N. Liu ◽  
Y. Liu ◽  
H. Wu ◽  
Y. Jiang ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Solid Acid ◽  
Acid Group ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Sulfonic Acid Group

Preparation of Strong Acid Catalysts by Sulfate Treatment of Calcined Boehmite

1992 ◽  
Vol 57 (11) ◽  
pp. 2241-2247 ◽  
Author(s):  
Tomáš Hochmann ◽  
Karel Setínek
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Aluminum Sulfate ◽  
Solid Acid ◽  
Strong Acid ◽  
Acid Strength ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Preparation Methods ◽  
Indicator Method

Solid acid catalysts with acid strength of -14.52 < H0 < -8.2 were prepared by sulfate treatment of the samples of boehmite calcined at 105-800 °C. Two preparation methods were used: impregnation of the calcined boehmite with 3.5 M H2SO4 or mixing of the boehmite samples with anhydrous aluminum sulfate, in both cases followed by calcination in nitrogen at 650 °C. The catalysts were characterized by measurements of surface area, adsorption of pyridine and benzene, acid strength measurements by the indicator method and by catalytic activity tests in the isomerization of cyclohexene, p-xylene and n-hexane. Properties of the catalysts prepared by both methods were comparable.

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