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 High Acid Biochar-Based Solid Acid Catalyst from Corn Stalk for Lignin Hydrothermal Degradation

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1623
Author(s):  
Qimeng Jiang ◽  
Guihua Yang ◽  
Fangong Kong ◽  
Pedram Fatehi ◽  
Xiaoying Wang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Corn Stalk ◽  
Acid Amount ◽  
High Acid

Solid acid catalysts generally show the disadvantage of low acid amount and low recycling rate. To solve these problems, corn stalk-based solid acid catalysts were synthesized through carbonization and sulfonation processes in this work. The results showed that besides the rod-like structure inherited from raw corn stalk, the catalysts contained some small broken pieces on the surface, and the specific surface area varied from 1120 to 1640 m2/g. The functional groups (-SO3H) were successfully introduced onto the surface of the obtained solid acid catalysts. The acid amount varied between 1.2 and 2.4 mmol/g, which was higher than most of solid acid catalysts. The catalyst produced at 800 °C for 6 h in carbonation and then at 150 °C for 8 h in sulfonation had larger specific surface area and more sulfonate groups. In the degradation of lignin, the use of catalyst led to the generation of more aromatic compounds (65.6 wt. %) compared to that without using the catalyst (40.5 wt. %). In addition, a stable yield of reaction (85%) was obtained after four reuses. Therefore, corn stalk is suitable for high-value utilization to prepare high-acid amount biochar-based catalyst.

Fabrication of mesoporous solid acid catalysts with tunable surface wettability for efficient catalysis

2016 ◽  
Vol 40 (5) ◽  
pp. 4775-4780 ◽  
Author(s):  
Juan Wei ◽  
Like Zou ◽  
Jianzhang Li
Keyword(s):  
Catalytic Activity ◽  
Solid Acid ◽  
Surface Wettability ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Hydrophobic Surfaces

Mesoporous solid acid catalysts with tunable surface wettability were fabricated successfully and hydrophobic surfaces are beneficial for catalytic activity.

Preparation and Characterization of SO42-/Fe-Al-Activated Solid Acid Catalyst

2017 ◽  
Vol 727 ◽  
pp. 438-444
Author(s):  
Xiang Ying Hao ◽  
Yu Li Zhang ◽  
Guan Hua Shen ◽  
Wen Sheng Wu
Keyword(s):  
Catalytic Activity ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Ftir Spectra ◽  
Solid Acid Catalysts ◽  
Cross Linking ◽  
Acid Catalysts

SO42-/ Al-Fe-activated solid acid catalysts had been prepared in different conditions using cross-linking method, and characterized by XRD, BET, FTIR spectra and TG-DTA. The catalyst performed highly catalytic activity in the hydration of turpentine to α-terpineol.

Polyvinyl trisulfonate ethylamine based solid acid catalyst for the efficient glycosylation of sugars under solvent free conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (127) ◽  
pp. 104715-104724 ◽  
Author(s):  
Avinash A. Chaugule ◽  
Amol R. Jadhav ◽  
Hern Kim
Keyword(s):  
Catalytic Activity ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Solvent Free Conditions ◽  
Acid Catalyzed

We have synthesized Brønsted solid acid catalysts which exhibited effective catalytic activity for acid catalyzed glycosylation reactions.

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.

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