Catalytic performance and ultrasonic-assisted impregnation effects on WO3/USY zeolites in esterification of oleic acid with methyl acetate

2020 ◽  
Vol 291 ◽  
pp. 109704 ◽  
Author(s):  
Felipe Ketzer ◽  
Dian Celante ◽  
Fernanda de Castilhos
Keyword(s):  
Oleic Acid ◽  
Methyl Acetate ◽  
Catalytic Performance ◽  
Ultrasonic Assisted

scholarly journals Polyethyleneimine-Oleic Acid Micelles-Stabilized Palladium Nanoparticles as Highly Efficient Catalyst to Treat Pollutants with Enhanced Performance

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1890
Author(s):  
Xiang Lai ◽  
Xuan Zhang ◽  
Shukai Li ◽  
Jie Zhang ◽  
Weifeng Lin ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Palladium Nanoparticles ◽  
Human Life ◽  
Catalytic Performance ◽  
Water Soluble ◽  
Noble Metal Nanoparticles ◽  
Hydrodynamic Diameter ◽  
Efficient Catalyst

Water soluble organic molecular pollution endangers human life and health. It becomes necessary to develop highly stable noble metal nanoparticles without aggregation in solution to improve their catalytic performance in treating pollution. Polyethyleneimine (PEI)-based stable micelles have the potential to stabilize noble metal nanoparticles due to the positive charge of PEI. In this study, we synthesized the amphiphilic PEI-oleic acid molecule by acylation reaction. Amphiphilic PEI-oleic acid assembled into stable PEI-oleic acid micelles with a hydrodynamic diameter of about 196 nm and a zeta potential of about 34 mV. The PEI-oleic acid micelles-stabilized palladium nanoparticles (PO-PdNPsn) were prepared by the reduction of sodium tetrachloropalladate using NaBH4 and the palladium nanoparticles (PdNPs) were anchored in the hydrophilic layer of the micelles. The prepared PO-PdNPsn had a small size for PdNPs and good stability in solution. Noteworthily, PO-PdNPs150 had the highest catalytic activity in reducing 4-nitrophenol (4-NP) (Knor = 18.53 s−1mM−1) and oxidizing morin (Knor = 143.57 s−1M−1) in aqueous solution than other previous catalysts. The enhanced property was attributed to the improving the stability of PdNPs by PEI-oleic acid micelles. The method described in this report has great potential to prepare many kinds of stable noble metal nanoparticles for treating aqueous pollution.

A brand new zeolite catalyst for carbonylation reaction

2019 ◽  
Vol 55 (8) ◽  
pp. 1048-1051 ◽  
Author(s):  
Xiaobo Feng ◽  
Jie Yao ◽  
Hangjie Li ◽  
Yuan Fang ◽  
Yoshiharu Yoneyama ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Methyl Acetate ◽  
Zeolite Catalyst ◽  
Catalytic Performance ◽  
Carbonylation Reaction

EU-12 zeolite was discovered to posses unreported catalytic performance for carbonylation reaction converting dimethyl ether to methyl acetate.

Liquid-Phase Selective Hydrogenation of Nitrobenzene over Ultrasonic-Assisted Ni-Mo-P Amorphous Catalyst

2012 ◽  
Vol 550-553 ◽  
pp. 420-423 ◽  
Author(s):  
Qian Wen Dai ◽  
Zi Li Liu ◽  
Cui Xia Xu ◽  
Qi Gang Xie ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Liquid Phase ◽  
Selective Hydrogenation ◽  
Active Sites ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Catalytic Performance ◽  
Chemical Reduction Method ◽  
Ultrasonic Assisted ◽  
Optimal Reaction

The Ni-Mo-P amorphous catalysts were prepared by chemical reduction method under different sonication conditions. The catalytic performance of the prepared catalysts in selective hydrogenation of nitrobenzene(NB) to aniline(AN) were characterized by XRD, BET, N2-adsorption, H2-TPR and H2-TPD. The results show that the introduction of ultrasonic can improve the dispersion of the active sites in the catalyst, the particle size of the catalyst is also smaller than the regular prepared Ni-Mo-P amorphous catalyst. And the influences of the sonication power and time on the catalysts were discussed and compared. The optimal sonication condition is 70 W within 25 min, its optimal reaction time is 150 min.

scholarly journals Synthesis of Magnetic Catalyst Derived from Oil Palm Empty Fruit Bunch for Esterification of Oleic Acid: An Optimization Study

2021 ◽  
Vol 17 (1) ◽  
pp. 65-77
Author(s):  
Shamala Gowri Krishnan ◽  
Fei-Ling Pua ◽  
Ee-Sann Tan
Keyword(s):  
Oleic Acid ◽  
Oil Palm ◽  
Acid Catalyst ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Empty Fruit Bunch ◽  
Biomass Waste ◽  
Magnetic Catalyst ◽  
Rsm Optimization

Biomass, renewable, abundantly available and a good source of energy. The conversion of biomass waste into valuable products has received wide attention. In this study, an empty fruit bunch (oil palm EFB) supported magnetic acid catalyst for esterification reaction was successfully prepared via the one-step impregnation process. The new magnetic catalyst achieved a higher surface area of 188.87 m2/g with a total acidity of 2.4 mmol/g and identified iron oxide as g-Fe2O3. The magnetization value of 24.97 emu/g demonstrated that the superparamagnetic catalyst could be easily recovered and separated after the reaction using an external magnet. The catalytic performance of oil palm EFB supported magnetic acid catalyst was examined by esterification of oleic acid. Esterification process parameters were optimized via Response Surface Methodology (RSM) optimization tool with Box-Behnken design (BBD). The following optimum parameters were determined: an amount of 9 wt% catalyst, molar ratio of methanol to oleic acid of 12:1, reaction time of 2 h and reaction temperature of 60 °C with a maximum conversion of 94.91% was achieved. The catalyst can be recycled up to five cycles with minimal loss in its activity. The oil palm waste-based magnetic acid catalyst indicates its potential replacement to the existing solid catalysts that are economical and environmentally friendly for the esterification process in biofuel applications. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

New Silica Supported HClO4 as Efficient Catalysts for Estolide Synthesis from Oleic Acid

2010 ◽  
Vol 173 ◽  
pp. 140-145 ◽  
Author(s):  
Nor Asikin Mohamad Nordin ◽  
Nadia Farhana Adnan ◽  
Aznira Alias ◽  
Wan Nor Roslam Wan Isahak ◽  
Jumat Salimon ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Perchloric Acid ◽  
Solid Acid ◽  
Condensation Reaction ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Catalytic Performance ◽  
Area Measurement ◽  
Bet Surface Area ◽  
Experimental Findings

The syntheses of estolides via condensation reaction of oleic acid were investigated using heterogenous catalysts. In this study HClO4 is supported onto suitable support to make it environmentally friendly. A series of solid acid catalyst containing 5-45 % of perchloric acid supported onto silica was synthesized and characterized using XRD, BET surface area measurement, TEM and XPS surface analysis. Silica modified with perchloric acid was found to be efficient and environmentally benign solid acid catalyst for estolide synthesis. The reaction was performed at 70 oC for 10 hours to give oleic-oleic monoestolide acid (m/z 563.51 as M-H)-. Based on the experimental findings above, optimum catalytic performance was with 15 % HClO4 loading onto SiO2 to give 98.98 % conversion of the oleic acid with 63.98 % oleic-oleic monoestolide acid selectivity.

Effects of Microwave and Ultrasonic-Assisted Aging on the Synthesis of H-ZSM-5 Nanozeolite and Its Catalytic Performance in Methanol Dehydration

2014 ◽  
Vol 12 (1) ◽  
pp. 355-362 ◽  
Author(s):  
Saeid Abbasian ◽  
Majid Taghizadeh
Keyword(s):  
Fixed Bed ◽  
Catalytic Performance ◽  
Operating Conditions ◽  
Fixed Bed Reactor ◽  
Crystallization Time ◽  
Microwave Assisted ◽  
Ultrasonic Assisted ◽  
Ft Ir ◽  
Static Conditions ◽  
Ultrasonic Stirring

Abstract H-ZSM-5 nanozeolite was hydrothermally synthesized under static conditions. Evaluation of hydrothermal synthesis of ZSM-5 was performed by treating the synthesis mixture using different aging processes, consist of ultrasonic, stirring, and microwave-assisted aging, prior to the conventional hydrothermal treatment. The catalytic performances of selected catalysts were studied for the dehydration of methanol to dimethyl ether (DME) in a fixed-bed reactor under the same operating conditions (T = 300°C, P = 1 atm, and WHSV = 26 h−1). The prepared samples were characterized by XRD, SEM, BET, NH3-TPD and FT-IR techniques. The results showed that ultrasonic and microwave-assisted aging shortened the crystallization time and reduced crystal size of the obtained products without having any considerable effects on their catalytic activities.

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