ChemInform Abstract: Solid Acid Catalysts: Modification of Acid Sites and Effect on Activity and Selectivity Tuning in Various Reactions

ChemInform ◽  
2010 ◽  
Vol 41 (32) ◽  
pp. no-no
Author(s):  
C. V. Rode ◽  
A. C. Garade ◽  
R. C. Chikate
Keyword(s):  
Solid Acid ◽  
Acid Sites ◽  
Solid Acid Catalysts ◽  
Acid Catalysts

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.

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.

scholarly journals Investigating the role of framework topology and accessible active sites in silicoaluminophosphates for modulating acid-catalysis

2018 ◽  
Vol 8 (20) ◽  
pp. 5155-5164 ◽  
Author(s):  
Matthew E. Potter ◽  
Julija Kezina ◽  
Richard Bounds ◽  
Marina Carravetta ◽  
Thomas M. Mezza ◽  
...  
Keyword(s):  
Active Sites ◽  
Acid Catalysis ◽  
Solid Acid ◽  
Acid Sites ◽  
Beckmann Rearrangement ◽  
Solid Acid Catalysts ◽  
Acid Catalysts

Framework topology and the acid sites significantly influence the Beckmann rearrangement, affecting the design of solid-acid catalysts.

scholarly journals Catalytic production of oxygenated additives by glycerol etherification

2014 ◽  
Vol 12 (12) ◽  
pp. 1248-1254 ◽  
Author(s):  
Catia Cannilla ◽  
Giuseppe Bonura ◽  
Leone Frusteri ◽  
Francesco Frusteri
Keyword(s):  
Gas Phase ◽  
Solid Acid ◽  
Reaction Medium ◽  
Acid Sites ◽  
Butyl Alcohol ◽  
Solid Acid Catalysts ◽  
High Rate ◽  
Acid Catalysts ◽  
Oxygenated Additives ◽  
Tert Butyl Alcohol

AbstractIn this work the etherification reaction of glycerol with isobutene (IB) and tert-butyl alcohol (TBA) has been studied with the aim of preparing mixtures with high content of poly-substituted ethers. The results obtained using solid acid catalysts have shown that the reaction with IB proceeds at a high rate but the formation of undesired di-isobutene (DIB) represents a serious problem when catalysts with high density of acid sites, such as Amberlyst, are used. When using TBA as a reactant, the main problem is the formation of water that, due to thermodynamic reasons, prevents the formation of poly-substituted ethers regardless of the catalyst used. Some preliminary experiments carried out with a water permselective tubular membrane have demonstrated that the yield of poly-substituted ethers significantly increases once water was selectively removed from the reaction medium by recirculation of the gas phase.

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