Homogeneous borotungstic acid and heterogeneous micellar borotungstic acid catalysts for biodiesel production by esterification of free fatty acid

Sun, Zhong; Duan, Xixin; Zhao, Jing; Wang, Xiaohong; Jiang, Zijiang

doi:10.1016/j.biombioe.2015.03.002

Cited by 20 publications

(11 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One option is to use hetropolyacids as strong Brønsted acid catalysts for catalytic esterification and transesterification reactions to produce biodiesel with high conversions (Talebian-Kiakalaieh et al, 2013;Sun et al, 2015;Xie and Wan, 2019a). Unfortunately, hetropolyacids have certain disadvantages, such as good solubility in polar media and a low surface area (Parida and Mallick, 2007;Ekinci and Oktar, 2019).…”

Section: Introductionmentioning

confidence: 99%

Green and Facile Synthesis of Metal-Organic Framework Cu-BTC-Supported Sn (II)-Substituted Keggin Heteropoly Composites as an Esterification Nanocatalyst for Biodiesel Production

et al. 2020

View full text Add to dashboard Cite

In the present study, metal-organic framework Cu-BTC-supported Sn (II)-substituted Keggin heteropoly nanocomposite (Sn 1.5 PW/Cu-BTC) was successfully prepared by a simple impregnation method and applied as a novel nanocatalyst for producing biodiesel from oleic acid (OA) through esterification. The nanocatalyst was characterized by Fourier transform infrared spectrometry (FTIR), wide-angle X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption, thermogravimetrics (TG), and NH 3-temperature-programmed desorption (NH 3-TPD). Accordingly, the synthesized nanocatalyst with a Sn 1.5 PW/Cu-BTC weight ratio of 1 exhibited a relatively large specific surface area, appropriate pore size, and high acidity. Moreover, an OA conversion of 87.7% was achieved under optimum reaction conditions. The nanocatalyst was reused seven times, and the OA conversion remained at more than 80% after three uses. Kinetic study showed that the esterification reaction followed first-order kinetics, and the activation energy (E a) was calculated to be 38.3 kJ/mol.

show abstract

Section: Introductionmentioning

confidence: 99%

Green and Facile Synthesis of Metal-Organic Framework Cu-BTC-Supported Sn (II)-Substituted Keggin Heteropoly Composites as an Esterification Nanocatalyst for Biodiesel Production

et al. 2020

View full text Add to dashboard Cite

show abstract

“…We guessed that the diffraction peaks of CoK 4 [P 2 W 18 O 62 ] in {P 2 W 18 }@Co-BTC should mask some peaks of Co-BTC ( Figure S1b ). In addition, {P 2 W 18 }@Co-BTC produced new diffraction peaks at 13.22°, 20.48°, 20.84°, 21.64°, 36.24° and 51.06° (in Figure 1 c,d), determining that CoK 4 [P 2 W 18 O 62 ] cooperated with Co-BTC to form the target synthesis product [ 44 ]. New phases also exist in {P 2 W 18 }@Co-BTC-1-3 (♦ in Figure S1b ), confirming that {P 2 W 18 }@Co-BTC-1-3 are all synthesized as new nanomaterials.…”

Section: Resultsmentioning

confidence: 99%

Nanomaterial with Core–Shell Structure Composed of {P2W18O62} and Cobalt Homobenzotrizoate for Supercapacitors and H2O2-Sensing Applications

Zhang

Lin

et al. 2023

Nanomaterials

View full text Add to dashboard Cite

Designing and preparing dual-functional Dawson-type polyoxometalate-based metal–organic framework (POMOF) energy storage materials is challenging. Here, the Dawson-type POMOF nanomaterial with the molecular formula CoK4[P2W18O62]@Co3(btc)2 (abbreviated as {P2W18}@Co-BTC, H3btc = 1,3,5-benzylcarboxylic acid) was prepared using a solid-phase grinding method. XRD, SEM, TEM et al. analyses prove that this nanomaterial has a core–shell structure of Co-BTC wrapping around the {P2W18}. In the three-electrode system, it was found that {P2W18}@Co-BTC has the best supercapacitance performance, with a specific capacitance of 490.7 F g−1 (1 A g−1) and good stability, compared to nanomaterials synthesized with different feedstock ratios and two precursors. In the symmetrical double-electrode system, both the power density (800.00 W kg−1) and the energy density (11.36 Wh kg−1) are greater. In addition, as the electrode material for the H2O2 sensor, {P2W18}@Co-BTC also exhibits a better H2O2-sensing performance, such as a wide linear range (1.9 μM–1.67 mM), low detection limit (0.633 μM), high selectivity, stability (92.4%) and high recovery for the detection of H2O2 in human serum samples. This study provides a new strategy for the development of Dawson-type POMOF nanomaterial compounds.

show abstract

“…This structure could afford high local reactant concentrations near the catalysts, helping to overcome the limited solubility of hydrophobic substrates in polar media. Several examples were recently studied using a micellar catalyst in the transformation of biomass in valuable building blocks [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

First Report About the Use of Micellar Keggin Heteropolyacids as Catalysts in the Green Multicomponent Synthesis of Nifedipine Derivatives

et al. 2016

View full text Add to dashboard Cite

Micellar Keggin heteropolyacid catalysts were prepared using hexadecyltrimethylammonium bromide (cetyltrimethylammonium bromide-CTAB), 1-hexadecylpyridinium chloride, and Keggin heteropolyacids H 3 PMo 12 O 40 and H 4 PMo 11 VO 40 as precursors. Four catalysts were prepared (PMo12C16, PMo11VC16, PMo12C 16Py, and PMo11VC16Py) and characterized by 31 P NMR, FT-IR, XRD, SEM analysis and textural properties (S BET ). The acidic characteristics of the catalysts were determined by potentiometric titration with n-butylamine. A series of bioactive 1,4-dihydropyridine derivatives such as nifedipine and nemadipine B were synthesized using these new materials, in a one-pot procedure in ethanol. This methodology requires a reaction time of 8 h, and a temperature of 78°C to obtain good to excellent yields of 1,4-dihydropyridine derivatives. The micellar Keggin catalysts are insoluble in polar media, which allows easy removal of the reaction products without affecting their catalytic activity. The leaching test showed that they have an excellent stability and can be used five times as heterogeneous catalysts without appreciable loss of the catalytic activity. Using the same material, unsymmetrical 1,4-dihydropyridines such as nitrendipine can be obtained through a sequence of steps in very good yield (78 %). Graphical Abstract

show abstract

Homogeneous borotungstic acid and heterogeneous micellar borotungstic acid catalysts for biodiesel production by esterification of free fatty acid

Cited by 20 publications

References 35 publications

Green and Facile Synthesis of Metal-Organic Framework Cu-BTC-Supported Sn (II)-Substituted Keggin Heteropoly Composites as an Esterification Nanocatalyst for Biodiesel Production

Green and Facile Synthesis of Metal-Organic Framework Cu-BTC-Supported Sn (II)-Substituted Keggin Heteropoly Composites as an Esterification Nanocatalyst for Biodiesel Production

Nanomaterial with Core–Shell Structure Composed of {P2W18O62} and Cobalt Homobenzotrizoate for Supercapacitors and H2O2-Sensing Applications

First Report About the Use of Micellar Keggin Heteropolyacids as Catalysts in the Green Multicomponent Synthesis of Nifedipine Derivatives

Contact Info

Product

Resources

About