Silica-Sulfuric Acid and Alumina-Sulfuric Acid – Versatile Supported Bronsted Acid Catalysts

2021 ◽  
Author(s):  
Amit Pramanik ◽  
Sanjay Bhar
Keyword(s):  
Sulfuric Acid ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Functionalized Silica ◽  
Bronsted Acid ◽  
Silica Sulfuric Acid ◽  
Brönsted Acid ◽  
Bronsted Acid Catalysts ◽  
Heterogeneous Solid

Abstract: The –SO3H functionalized silica and alumina have emerged as efficient and eco-compatible heterogeneous solid acid catalysts for the construction of various important molecular skeletons. The advantages of –SO3H functionalized...

scholarly journals Catalytic role of solid acid catalysts in glycerol acetylation for the production of bio-additives: a review

RSC Advances ◽  
2016 ◽  
Vol 6 (73) ◽  
pp. 68885-68905 ◽  
Author(s):  
Pei San Kong ◽  
Mohamed Kheireddine Aroua ◽  
Wan Mohd Ashri Wan Daud ◽  
Hwei Voon Lee ◽  
Patrick Cognet ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Lewis Acid ◽  
Solid Acid ◽  
Operating Conditions ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Bronsted Acid ◽  
Brönsted Acid ◽  
Catalytic Role

The influencing factors of Brønsted acid and Lewis acid in glycerol acetylation to potential bioadditives (mono-, di- and triacetin) are detailed. The important catalytic role and operating conditions toward conversion and selectivity are suggested.

scholarly journals Active, Selective, and Recyclable Zr(SO4)2/SiO2 and Zr(SO4)2/Activated Carbon Solid Acid Catalysts for Esterification of Malic Acid to Dimethyl Malate

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 384
Author(s):  
Pei Yu ◽  
Can Chen ◽  
Guangci Li ◽  
Zhong Wang ◽  
Xuebing Li
Keyword(s):  
Activated Carbon ◽  
Electron Density ◽  
Malic Acid ◽  
Solid Acid ◽  
Supported Catalysts ◽  
Acid Strength ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Bronsted Acid ◽  
Brönsted Acid

The esterification of malic acid using traditional homogenous catalysts suffers from the difficulty in reuse of the catalyst and undesirable side reactions. In this work, Zr(SO4)2/SiO2 and Zr(SO4)2/activated carbon (AC) as solid acid catalysts were prepared for malic acid esterification with methanol. The conversion of malic acid over these two catalysts is comparable to that over H2SO4 and unsupported Zr(SO4)2∙4H2O catalysts; however; a 99% selectivity of dimethyl malate can be realized on these two supported catalysts, which is much higher than that of conventional H2SO4 (75%) and unsupported Zr(SO4)2∙4H2O (80%) catalysts, highlighting the critical role of AC and SiO2 supports in tuning the selectivity. We suggest that the surface hydroxyls of AC or lattice O2− ions from SiO2 donate electrons to Zr4+ in Zr(SO4)2/AC and Zr(SO4)2/SiO2 catalysts, which results in the increase in electron density on Zr4+. The enhanced electron density on Zr4+ reduces the degree of H delocalization from crystal water and then decreases the Brønsted acid strength. Consequently, the reduced Brønsted acid strength of Zr(SO4)2/AC and Zr(SO4)2/SiO2 catalysts suppresses the intermolecular dehydration side reaction. In addition, these two supported catalysts can be easily separated from the reaction system by simple filtration with almost no loss of activity.

Phosphonate functionalized carbon spheres as Brønsted acid catalysts for the valorization of bio-renewable α-pinene oxide to trans-carveol

2020 ◽  
Vol 49 (21) ◽  
pp. 7210-7217
Author(s):  
Amravati S. Singh ◽  
Jacky H. Advani ◽  
Ankush V. Biradar
Keyword(s):  
Heterogeneous Catalysts ◽  
Solid Acid ◽  
Acid Catalysts ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Carbon Spheres ◽  
Simple Route ◽  
Brönsted Acid ◽  
Bronsted Acid Catalysts

Herein, we report a simple route for the synthesis of phosphonate functionalized Brønsted solid acid carbon spheres as heterogeneous catalysts for the valorization of bio-derived α-pinene oxide.

Strong or weak acid, which is more efficient for Beckmann rearrangement reaction over solid acid catalysts?

2015 ◽  
Vol 5 (7) ◽  
pp. 3675-3681 ◽  
Author(s):  
Yueying Chu ◽  
Peng Ji ◽  
Xianfeng Yi ◽  
Shenhui Li ◽  
Peng Wu ◽  
...  
Keyword(s):  
Solid Acid ◽  
Weak Acid ◽  
Acid Strength ◽  
Beckmann Rearrangement ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid ◽  
Rearrangement Reaction

The effects of Brønsted acid strength and pore confinement on the Beckmann rearrangement reaction over solid acid catalysts have been explored.

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