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

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

Download Full-text

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

Journal of Porous Materials ◽

10.1007/s10934-017-0414-1 ◽

2017 ◽

Vol 25 (1) ◽

pp. 1-13 ◽

Cited By ~ 11

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

Download Full-text

Microwave assisted rapid conversion of fructose into 5-HMF over solid acid catalysts

RSC Advances ◽

10.1039/c5ra22979k ◽

2015 ◽

Vol 5 (128) ◽

pp. 106053-106060 ◽

Cited By ~ 10

Author(s):

Jie Wang ◽

Ting Qu ◽

Minsi Liang ◽

Zhenbo Zhao

Keyword(s):

Reaction Time ◽

Solid Acid ◽

Solid Acid Catalysts ◽

Acid Catalysts ◽

Short Reaction Time ◽

Microwave Assisted ◽

Efficient Conversion ◽

Rapid Conversion

Microwave assisted efficient conversion of fructose into 5-hydroxymethylfurfural over solid acid catalysts in a very short reaction time.

Download Full-text

Solid Acid Catalysts for the Hock Cleavage of Hydroperoxides

Catalysts ◽

10.3390/catal12010091 ◽

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.

Download Full-text

Preparation of Strong Acid Catalysts by Sulfate Treatment of Calcined Boehmite

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19922241 ◽

1992 ◽

Vol 57 (11) ◽

pp. 2241-2247 ◽

Cited By ~ 2

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.

Download Full-text

Metal–Organic Framework-Based Solid Acid Materials for Biomass Upgrade

Transactions of Tianjin University ◽

10.1007/s12209-021-00298-4 ◽

2021 ◽

Author(s):

Yutian Qin ◽

Jun Guo ◽

Meiting Zhao

Keyword(s):

High Efficiency ◽

Solid Acid ◽

Metal Organic Framework ◽

Acid Sites ◽

Solid Acid Catalysts ◽

Future Research ◽

Acid Catalysts ◽

Metal Organic ◽

Biomass Transformation ◽

Organic Framework

AbstractBiomass is a green and producible source of energy and chemicals. Hence, developing high-efficiency catalysts for biomass utilization and transformation is urgently demanded. Metal–organic framework (MOF)-based solid acid materials have been considered as promising catalysts in biomass transformation. In this review, we first introduce the genre of Lewis acid and Brønsted acid sites commonly generated in MOFs or MOF-based composites. Then, the methods for the generation and adjustment of corresponding acid sites are overviewed. Next, the catalytic applications of MOF-based solid acid materials in various biomass transformation reactions are summarized and discussed. Furthermore, based on our personal insights, the challenges and outlook on the future development of MOF-based solid acid catalysts are provided. We hope that this review will provide an instructive roadmap for future research on MOFs and MOF-based composites for biomass transformation.

Download Full-text

Nonthermal Plasma Induced Fabrication of Solid Acid Catalysts for Glycerol Dehydration to Acrolein

Catalysts ◽

10.3390/catal11030391 ◽

2021 ◽

Vol 11 (3) ◽

pp. 391

Author(s):

Lu Liu ◽

Xiaofei Philip Ye

Keyword(s):

Solid Acid ◽

Nonthermal Plasma ◽

Temperature Programmed Desorption ◽

Argon Atmosphere ◽

Solid Acid Catalysts ◽

Acid Catalysts ◽

Pyridine Adsorption ◽

X Ray ◽

Glycerol Dehydration ◽

Temperature Programmed

The feasibility of fabricating better solid acid catalysts using nonthermal plasma (NTP) technology for biobased acrolein production is demonstrated. NTP discharge exposure was integrated in catalyst fabrication in air or argon atmosphere. The fabricated catalysts were characterized by Brunauer–Emmett–Teller surface area analysis, temperature-programmed desorption of ammonia, X-ray powder diffraction and Fourier-transform infrared spectroscopy of pyridine adsorption, in comparison to regularly prepared catalysts as a control. Further, kinetic results collected via glycerol dehydration experiments were compared, and improvement in acrolein selectivity was displayed when the catalyst was fabricated in the argon NTP, but not in the air NTP. Possible mechanisms for the improvement were also discussed.

Download Full-text