Competent, selective and high yield of 7-hydroxy-4-methyl coumarin over sulfonated mesoporous silica as solid acid catalysts

2017 ◽  
Vol 25 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Abd El Rahman S. Khder ◽  
Saleh A. Ahmed ◽  
Khalid S. Khairou ◽  
Hatem M. Altass
Keyword(s):  
Mesoporous Silica ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
High Yield ◽  
Acid Catalysts

ChemInform Abstract: Mesoporous Silica Supported Solid Acid Catalysts

ChemInform ◽  
2000 ◽  
Vol 31 (50) ◽  
pp. no-no
Author(s):  
Saemin Choi ◽  
Yong Wang ◽  
Zimin Nie ◽  
Dev Khambapati ◽  
Jun Liu ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts

Designed synthesis of sulfonated polystyrene/mesoporous silica hollow nanospheres as efficient solid acid catalysts

2014 ◽  
Vol 2 (20) ◽  
pp. 7546-7554 ◽  
Author(s):  
Xiaomin Zhang ◽  
Lei Zhang ◽  
Qihua Yang
Keyword(s):  
Mesoporous Silica ◽  
Solid Acid ◽  
Silica Shell ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Hollow Nanospheres ◽  
Sulfonated Polystyrene ◽  
Designed Synthesis

We report the successful synthesis of hybrid hollow nanospheres with sulfonated polystyrene aligned in the mesoporous channels of a silica shell.

scholarly journals Design, Characterization and Application of The SCMNPs@PC/VB1-Zn as A Green and Recyclable Biocatalyst for Synthesis of Pyrano[2,3-c]pyrazole and 4H-benzo-[b]-pyran Derivatives

2020 ◽  
Vol 15 (1) ◽  
pp. 199-212
Author(s):  
Fang Hou ◽  
Wei Zheng ◽  
Nasser Yousefi
Keyword(s):  
Reaction Time ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
High Yield ◽  
Acid Catalysts ◽  
Magnetic Nanocatalyst ◽  
Basic Catalysts

Eco-friendly and reusable solid acid catalysts (SCMNPs@PC/VB1-Zn) were identified as one of the most effective basic catalysts for the composition of a pot, three-component pyrano[2,3-c]pyrazoles. Methyl-1-phenyl-1H-pyrazole-5(4H)-one, benzaldehyde and malononitrile in high yield at 80 °C. SCMNPs@ PC/VB1-Zn reports the simple and efficient catalysis of a three-component pot reaction of dimedone, aldehydes, and malononitrile to 4H-benzo-[b]-pyran derivatives. This magnetic nanocatalyst can be recycled more than 6 times without dramatically reducing performance with respect to reaction time and efficiency. Copyright © 2020 BCREC Group. All rights reserved

scholarly journals Sulfonated mesoporous silica–carbon composites and their use as solid acid catalysts

2012 ◽  
Vol 261 ◽  
pp. 574-583 ◽  
Author(s):  
Patricia Valle-Vigón ◽  
Marta Sevilla ◽  
Antonio B. Fuertes
Keyword(s):  
Mesoporous Silica ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Carbon Composites ◽  
Acid Catalysts

Shape-Selective Solid Acid Catalysts Based on Tungstophosphoric Acid Supported on Mesoporous Silica

1999 ◽  
pp. 353-368 ◽  
Author(s):  
Yong Wang ◽  
Anthony Y. Kim ◽  
X. Shari Li ◽  
Li-Qiong Wang ◽  
Charles H. F. Peden ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Solid Acid ◽  
Tungstophosphoric Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Shape Selective

Facile, low-cost, and scalable fabrication of particle size and pore structure tuneable monodisperse mesoporous silica nanospheres as supports for advanced solid acid catalysts

RSC Advances ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 9072-9081 ◽  
Author(s):  
Zhongkui Zhao ◽  
Xianhui Wang ◽  
Yanhua Jiao ◽  
Boyuan Miao ◽  
Xinwen Guo ◽  
...  
Keyword(s):  
Particle Size ◽  
Mesoporous Silica ◽  
Pore Structure ◽  
Solid Acid ◽  
Low Cost ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Silica Nanospheres ◽  
Mesoporous Silica Nanospheres

This work presents a facile, low-cost, and scalable strategy for fabricating monodisperse mesoporous silica nanospheres with tuneable particle size and pore structure, which serves as an excellent carrier for advanced solid acid catalysts.

scholarly journals Solid Acid Catalysts for the Hock Cleavage of Hydroperoxides

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 91
Author(s):  
Jan Drönner ◽  
Peter Hausoul ◽  
Regina Palkovits ◽  
Matthias Eisenacher
Keyword(s):  
Sulfuric Acid ◽  
Heterogeneous Catalysts ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
High Yield ◽  
Annual Growth Rate ◽  
Acid Catalysts ◽  
Synthetic Route ◽  
Compound Annual Growth Rate ◽  
Different Types

The oxidation of cumene and following cleavage of cumene hydroperoxide (CHP) with sulfuric acid (Hock rearrangement) is still, by far, the dominant synthetic route to produce phenol. In 2020, the global phenol market reached a value of 23.3 billion US$ with a projected compound annual growth rate of 3.4% for 2020–2025. From ecological and economical viewpoints, the key step of this process is the cleavage of CHP. One sought-after way to likewise reduce energy consumption and waste production of the process is to substitute sulfuric acid with heterogeneous catalysts. Different types of zeolites, silicon-based clays, heteropoly acids, and ion exchange resins have been investigated and tested in various studies. For every type of these solid acid catalysts, several materials were found that show high yield and selectivity to phenol. In this mini-review, first a brief introduction and overview on the Hock process is given. Next, the mechanism, kinetics, and safety aspects are summarized and discussed. Following, the different types of heterogeneous catalysts and their performance as catalyst in the Hock process are illustrated. Finally, the different approaches to substitute sulfuric acid in the synthetic route to produce phenol are briefly concluded and a short outlook is given.

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