Sulfonated carbon/nano-metal oxide composites: a novel and recyclable solid acid catalyst for organic synthesis in benign reaction media

2015 ◽  
Vol 39 (8) ◽  
pp. 6338-6350 ◽  
Author(s):  
Manmeet Kour ◽  
Satya Paul
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Organic Synthesis ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Acid Catalyzed ◽  
Oxide Composites ◽  
Reaction Media

A novel catalytic system based on the use of nano-metal oxides and carbon has been designed and exhibits excellent catalytic activity for acid catalyzed organic reactions.

Polyvinyl trisulfonate ethylamine based solid acid catalyst for the efficient glycosylation of sugars under solvent free conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (127) ◽  
pp. 104715-104724 ◽  
Author(s):  
Avinash A. Chaugule ◽  
Amol R. Jadhav ◽  
Hern Kim
Keyword(s):  
Catalytic Activity ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Solvent Free Conditions ◽  
Acid Catalyzed

We have synthesized Brønsted solid acid catalysts which exhibited effective catalytic activity for acid catalyzed glycosylation reactions.

Novel Carbon-based Solid Acid from Green Pistachio Peel as an Efficient Catalyst for the Chemoselective Acylation, Acetalization and Thioacetalization of Aldehydes, Synthesis of Biscoumarins and Antimicrobial Evaluation

2019 ◽  
Vol 7 (1) ◽  
pp. 55-80 ◽  
Author(s):  
Fatemeh Ghorbani ◽  
Seied Ali Pourmousavi ◽  
Hamzeh Kiyani
Keyword(s):  
Catalytic Activity ◽  
High Efficiency ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Hydrothermal Carbonization ◽  
Biomass Waste ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Carbon Based

Background: Much attention has been focused on heterogeneous catalysts. Reactions with these recoverable and reusable catalysts are clean, selective with high efficiency. Among the heterogeneous solid acid catalyst in organic synthesis, Carbon-Based Solid Acids (CBSAs), which are important solid acid with many practical and research applications have been extensively studied. In this work, green Pistachio peel, a biomass waste, was converted into a novel carbon-based solid acid catalyst (Pis-SO3H). Objective: The aim of this work is to synthesize highly sulfonated carbon as an efficient, recyclable, nontoxic solid acid catalyst by simultaneous sulfonation, dehydration and carbonization of green Pistachio peel as biomass and investigate the catalytic activity of Pis-SO3H in acetalization, thioacetalization, acylation of aldehydes and synthesis of 3,3'-Arylmethylene-bis(4-hydroxycoumarin) derivatives. Method: Pis-SO3H was synthesized by an integrated fast one-step hydrothermal carbonization and sulfonation process in the presence of sulfuric acid. The characterization of the physicochemical properties of Pis-SO3H was achieved by XRD, FT-IR, FE-SEM, and elemental analysis. Results: The result of acid-base titration showed that the total acidity of the catalyst was 7.75 mmol H+g−1. This new heterogeneous catalyst has been efficiently used for the chemoselective thioacetalization, acetalization and acylation of aldehyde and the synthesis of biscoumarins under solvent-free conditions. All the reactions work easily in high yields. The antimicrobial activity of some of the biscoumarins was evaluated in screening by disk diffusion assay for the zone of inhibition. Conclusion: The catalytic activity of the Pis-SO3H was investigated during acetalization, thioacetalization, acylation and synthesis of biscoumarins. The results of protection of carbonyl groups and synthesis of biscoumarins in the present work offer effective alternatives for environmentally friendly utilization of abundant biomass waste.

Highly selective direct azidation of alcohols over a heterogeneous povidone–phosphotungstic solid acid catalyst

2016 ◽  
Vol 40 (12) ◽  
pp. 10240-10245 ◽  
Author(s):  
Sumit Kamble ◽  
Sagar More ◽  
Chandrashekhar Rode
Keyword(s):  
Room Temperature ◽  
Solid Acid ◽  
Phosphotungstic Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Product Yields ◽  
Acid Catalyzed

A heterogeneous povidone–phosphotungstic acid catalyzed direct selective azidation of alcohols gave excellent product yields at room temperature.

Esterification Research on a Bio-Oil Model Compounds System with an Optimal Solid Acid Catalyst

2011 ◽  
Vol 383-390 ◽  
pp. 1144-1149 ◽  
Author(s):  
Yue Ling Gu ◽  
Guo Hui Xu ◽  
Zuo Gang Guo ◽  
Shu Rong Wang
Keyword(s):  
Catalytic Activity ◽  
Solid Acid ◽  
Free Acid ◽  
Catalyst Activity ◽  
Solid Acid Catalyst ◽  
Volume Ratio ◽  
Acid Catalyst ◽  
Model Compounds ◽  
Acid Amount ◽  
Bio Oil

Solid acid catalyst has high catalytic esterification activity but with a free acid excess problem. In this paper, washing pretreatments were adopted in the catalyst preparation processes and their influences on catalytic activity and residual free acid amount were investigated. Residual free acid amount can be reduced by 33% with both washing before calcinations and washing after calcinations pretreatments. But their influences on catalyst activities were different. Washing before calcinations pretreatment reduced the catalytic activity from 80.29% to 57.72% while the other washing pretreatment had little influence on the catalyst activity. In order to describe the influence mechanism of washing pretreatments, catalysts were characterized by FT-IR and XRD. Finally, typical compounds in bio-oil were selected to form a bio-oil model compounds system. The catalyst pretreated by washing after calcinations was used on the esterification research of this bio-oil model system. The volume ratio of propanol to bio-oil model compound was 3:1. The reaction temperature was 90 °C and the amount of catalyst was 2wt% of total liquid mass. Combined with the GC-MS qualitative and quantitative results, carboxylic acids, such as formic acid, acetic acid, propionic acid were converted to esters effectively.

Enhanced catalytic activity and stability of SO2-4/ZrO2 solid acid catalyst combined with carbon nanotubes

2015 ◽  
Vol 41 (9) ◽  
pp. 12186-12191 ◽  
Author(s):  
Qiang Zhao ◽  
Shuangming Meng ◽  
Junli Wang ◽  
Yongsheng Qiao ◽  
Zuopeng Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst

Efficient Synthesis of 2,3-Dihydro-1H-Perimidine Derivatives Using HBOB as a Novel Solid Acid Catalyst

2012 ◽  
Vol 65 (1) ◽  
pp. 86 ◽  
Author(s):  
Sunanda B. Phadtare ◽  
R. Vijayraghavan ◽  
Ganapati S. Shankarling ◽  
Douglas R. MacFarlane
Keyword(s):  
Boric Acid ◽  
Efficient Method ◽  
Solid Acid ◽  
Simple Procedure ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Thermal Processes ◽  
Efficient Synthesis ◽  
Acid Catalyzed ◽  
Time Required

An efficient method for the synthesis of substituted 2,3-dihydro-1H-perimidine derivatives is described using bis(oxalato)boric acid (HBOB) as catalyst. The methodology provides an easily handled and recyclable catalyst for this type of reaction as an alternative platform to the conventional acid-catalyzed thermal processes. The time required to complete the reaction using HBOB was found to be shorter than conventional methods. Recycling of the catalyst has been efficiently achieved using a simple procedure.

Production of Levulinic Acid from Cellulose Catalyzed by Environmental-Friendly Catalyst

2010 ◽  
Vol 96 ◽  
pp. 183-187 ◽  
Author(s):  
Pan Wang ◽  
Si Hui Zhan ◽  
Hong Bing Yu
Keyword(s):  
Catalytic Activity ◽  
Levulinic Acid ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Impregnation Method ◽  
Acid Yield ◽  
Environmental Friendly ◽  
Sulfated Tio2 ◽  
Catalyst Dosage

Using solid acid catalyst for the levulinic acid (LA) production from cellulose is one of the promising methods for utilization of biomass. An environmentally friendly solid acid catalyst, sulfated TiO2 was prepared by precipitation-impregnation method and used to catalyze the production of levulinic acid from cellulose. The concentration of sulphuric acid had a remarkable influence on the construction and catalytic activity of sulfated TiO2. The influence of reaction temperature and catalyst dosage on levulinic acid yield was also investigated with the aim to obtain the highest yield of LA. The optimum condition for the highest yield of levulinic acid (27.2%) was achieved at 240 °C, 0.7g of sulfated TiO2 and reaction time of 15 min. The recycling test indicated that the catalytic activity of the catalyst had a slight decrease after being used two times.

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