scholarly journals Cover Feature: “Click” Silica‐Supported Sulfonic Acid Catalysts with Variable Acid Strength and Surface Polarity (Chem. Eur. J. 27/2019)

2019 ◽  
Vol 25 (27) ◽  
pp. 6648-6648
Author(s):  
Palraj Kasinathan ◽  
Charlotte Lang ◽  
Sambhu Radhakrishnan ◽  
Josefine Schnee ◽  
Cécile D'Haese ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Acid Strength ◽  
Acid Catalysts ◽  
Surface Polarity

“Click” Silica‐Supported Sulfonic Acid Catalysts with Variable Acid Strength and Surface Polarity

2019 ◽  
Vol 25 (27) ◽  
pp. 6753-6762 ◽  
Author(s):  
Palraj Kasinathan ◽  
Charlotte Lang ◽  
Sambhu Radhakrishnan ◽  
Josefine Schnee ◽  
Cécile D'Haese ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Acid Strength ◽  
Acid Catalysts ◽  
Surface Polarity

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.

scholarly journals Pretreatment of Switchgrass for Production of Glucose via Sulfonic Acid-Impregnated Activated Carbon

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 504
Author(s):  
Yane Ansanay ◽  
Praveen Kolar ◽  
Ratna Sharma-Shivappa ◽  
Jay Cheng ◽  
Consuelo Arellano
Keyword(s):  
Activated Carbon ◽  
Sulfonic Acid ◽  
Solid Acid ◽  
Methanesulfonic Acid ◽  
Biofuel Production ◽  
Acid Catalysts ◽  
Effects Of Temperature ◽  
Carbon Catalysts ◽  
Hydrolysis Of

In the present research, activated carbon-supported sulfonic acid catalysts were synthesized and tested as pretreatment agents for the conversion of switchgrass into glucose. The catalysts were synthesized by reacting sulfuric acid, methanesulfonic acid, and p-toluenesulfonic acid with activated carbon. The characterization of catalysts suggested an increase in surface acidities, while surface area and pore volumes decreased because of sulfonation. Batch experiments were performed in 125 mL serum bottles to investigate the effects of temperature (30, 60, and 90 °C), reaction time (90 and 120 min) on the yields of glucose. Enzymatic hydrolysis of pretreated switchgrass using Ctec2 yielded up to 57.13% glucose. Durability tests indicated that sulfonic solid-impregnated carbon catalysts were able to maintain activity even after three cycles. From the results obtained, the solid acid catalysts appear to serve as effective pretreatment agents and can potentially reduce the use of conventional liquid acids and bases in biomass-into-biofuel production.

Silica-bound sulfonic acid catalysts

1989 ◽  
Vol 54 (23) ◽  
pp. 5437-5443 ◽  
Author(s):  
Rickey D. Badley ◽  
Warren T. Ford
Keyword(s):  
Sulfonic Acid ◽  
Acid Catalysts

Amine Catalyzed Atomic Layer Deposition of (3-Mercaptopropyl)trimethoxysilane for the Production of Heterogeneous Sulfonic Acid Catalysts

2013 ◽  
Vol 25 (19) ◽  
pp. 3844-3851 ◽  
Author(s):  
David H. K. Jackson ◽  
Dong Wang ◽  
Jean Marcel R. Gallo ◽  
Anthony J. Crisci ◽  
Susannah L. Scott ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Sulfonic Acid ◽  
Atomic Layer ◽  
Acid Catalysts ◽  
Layer Deposition

scholarly journals Syntheses of Biodiesel Precursors: Sulfonic Acid Catalysts for Condensation of Biomass-Derived Platform Molecules

ChemSusChem ◽  
2014 ◽  
Vol 7 (4) ◽  
pp. 1078-1085 ◽  
Author(s):  
Madhesan Balakrishnan ◽  
Eric R. Sacia ◽  
Alexis T. Bell
Keyword(s):  
Sulfonic Acid ◽  
Acid Catalysts

scholarly journals Fabrication of Hollow Silica Nanospheres with Ultra-High Acid Density for Efficient Heterogeneous Catalysis

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 481 ◽  
Author(s):  
Xiaoli Zhang ◽  
Juan Wei ◽  
Xiaoming Zhang
Keyword(s):  
Sulfonic Acid ◽  
Condensation Reaction ◽  
Solid Acid Catalyst ◽  
Hollow Structure ◽  
Acid Catalyst ◽  
Acid Strength ◽  
Silica Nanospheres ◽  
Hollow Silica ◽  
High Acid ◽  
Hollow Silica Nanospheres

Hollow silica nanospheres with ultra-high acid density were fabricated successfully via sulfonation of phenyl-functionalized hollow silica nanospheres, which were synthesized through a single micelle (F127 (EO106PO70EO106))-templated method, with phenyltrimethoxysilane and tetramethoxysilane (TMOS) as silane precursors under neutral conditions. The density of sulfonic acid reached as high as 1.97 mmol/g. The characterization results of 31P-NMR using triethylphosphine oxide as a probe molecule suggested that the acid strength of hybrid solid acids could be systematically tuned by tuning the content of sulfonic acid and higher acid density results in stronger acid strength. Attributed to the unique hollow structure and high-acid density, the sulfonic acid-functionalized hollow silica nanospheres exhibited good catalytic performance in the condensation reaction of benzaldehyde with ethylene glycol. Notably, this study found that the catalytic activity was significantly influenced by the acid density and the ultra-high acid loading was beneficial for the activity due to the enhanced acid strength. This novel solid-acid catalyst also showed good recyclability and could be reused for at least 11 runs.

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
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