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

RSC Advances ◽  
2015 ◽  
Vol 5 (128) ◽  
pp. 106053-106060 ◽  
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.

Microwave-Assisted Oxidative Coupling of Amines to Imines on Solid Acid Catalysts.

ChemInform ◽  
2007 ◽  
Vol 38 (44) ◽  
Author(s):  
Shainaz M. Landge ◽  
Valentina Atanassova ◽  
Muralidhara Thimmaiah ◽  
Bela Toeroek
Keyword(s):  
Oxidative Coupling ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Microwave Assisted

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

Microwave-assisted synthesis of d-glucuronic acid derivatives using cost-effective solid acid catalysts

2010 ◽  
Vol 51 (10) ◽  
pp. 1356-1360 ◽  
Author(s):  
Aurore Richel ◽  
Pascal Laurent ◽  
Bernard Wathelet ◽  
Jean-Paul Wathelet ◽  
Michel Paquot
Keyword(s):  
Solid Acid ◽  
Glucuronic Acid ◽  
Cost Effective ◽  
Solid Acid Catalysts ◽  
Microwave Assisted Synthesis ◽  
Acid Catalysts ◽  
Microwave Assisted

Preparation of solid acid catalysts from waste biomass and their application for microwave-assisted biodiesel production from waste palm oil

2018 ◽  
Vol 36 (8) ◽  
pp. 719-728 ◽  
Author(s):  
Indika Thushari ◽  
Sandhya Babel
Keyword(s):  
Palm Oil ◽  
Photoelectron Spectroscopy ◽  
Solid Acid ◽  
Waste Utilization ◽  
Biodiesel Production ◽  
Solid Acid Catalysts ◽  
Molar Ratio ◽  
Acid Catalysts ◽  
Waste Biomass ◽  
Microwave Assisted

Waste utilization is essential and challenging. Utilization of wastes gives environmental, economic, and social benefits. In this study, inexpensive, sulfonated solid acid catalysts were successfully prepared from palm empty fruit bunch (PEFB), coconut meal residue (CMR), and coconut coir husk (CH) waste by a simple protocol. It was found that prepared PEFB–BCS–SO3H, CMR–BCS–SO3H, and CH–BCS–SO3H catalysts have 4.79, 3.75, and 2.80 mmol g-1 acid density and 739.0, 89.77, and 61.49 m2 g-1 surface areas, respectively. Further, the presence of active functional groups on the surface of the catalysts was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Thermal stability of the catalysts was found below 150°C. Results show that biodiesel yield increases with increasing reaction time and methanol loading, when using microwave heating for biodiesel production from waste palm oil (WPO) and prepared catalysts. A maximum biodiesel yield of 95.5% was obtained by PEFB–BCS–SO3H in 60 minutes using 20:1 methanol:oil (molar ratio) at 70°C. CMR–BCS–SO3H and CH–BCS–SO3H obtained 88.7 and 88.5% biodiesel yields in 60 minutes, using 20:1 and 16:1 methanol:oil (molar ratio), at 70 and 110°C, respectively. Even though, the activity of the catalysts decreased during reuse, these are still of interest as the waste biomass of PEFB, CMR, and CH can be used for catalyst preparation and microwave-assisted biodiesel production from WPO.

Microwave-assisted oxidative coupling of amines to imines on solid acid catalysts

2007 ◽  
Vol 48 (29) ◽  
pp. 5161-5164 ◽  
Author(s):  
Shainaz M. Landge ◽  
Valentina Atanassova ◽  
Muralidhara Thimmaiah ◽  
Béla Török
Keyword(s):  
Oxidative Coupling ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Microwave Assisted

Microwave-Assisted Conversion of Fructose to 5-Hydroxymethylfurfural Using Sulfonated Porous Carbon Derived from Biomass

2018 ◽  
Vol 71 (1) ◽  
pp. 24 ◽  
Author(s):  
Qiufeng Wang ◽  
Jiaqi Hao ◽  
Zhenbo Zhao
Keyword(s):  
Solid Acid ◽  
Nitrogen Adsorption ◽  
Acid Sites ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Standard Curve ◽  
Microwave Assisted ◽  
Synthetic Strategy ◽  
Microwave Assistance ◽  
Adsorption Desorption

In this study, a series of sulfonated carbon solid acid catalysts was prepared by a template method using fructose as the carbon source and zinc chloride as the catalyst and template. The reaction involving fructose dehydration to 5-hydroxymethylfurfural (5-HMF) was investigated using these catalysts with microwave assistance in dimethyl sulfoxide. The influence of different catalysts, catalyst amount, microwave power, fructose content, and reaction temperature, as well as the reusability of the catalyst, were investigated. The prepared catalysts were characterised by X-ray diffraction, FT-IR spectroscopy, scanning electron microscopy, nitrogen adsorption–desorption measurement, and temperature-programmed desorption of ammonia gas, and the total numbers of surface acid sites of these carbon-based solid acid catalysts were analysed by chemical adsorption–desorption of ammonia along with the standard curve for ammonia. The results revealed that the C2-SO3H catalyst exhibited the best activity. A 5-HMF yield of 87 % and fructose conversion of 99 % were achieved at 170°C in DMSO after 3 min. The microwave-assisted synthetic strategy was advantageous compared with the traditional method because this approach could shorten the total reaction time.

Solvent-free microwave-assisted synthesis of solketal from glycerol using transition metal ions promoted mordenite solid acid catalysts

2017 ◽  
Vol 434 ◽  
pp. 184-193 ◽  
Author(s):  
Samudrala Shanthi Priya ◽  
P.R. Selvakannan ◽  
Komandur V.R. Chary ◽  
Mannepalli Lakshmi Kantam ◽  
Suresh K. Bhargava
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Solid Acid ◽  
Transition Metal Ions ◽  
Solvent Free ◽  
Solid Acid Catalysts ◽  
Microwave Assisted Synthesis ◽  
Acid Catalysts ◽  
Microwave Assisted

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

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.

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