Clean 3,4-Dihydropyrimidones Synthesis via Biginelli Reaction over Supported Molybdenum: Structural and Textural Characteristic of αMoO3

Kheffache, Ouzna; López-Olmos, Cristina; Rodrı́guez-Ramos, I.; Cherifi, O.

doi:10.9767/bcrec.15.3.8264.698-713

Cited by 4 publications

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“…However, these peaks have a higher intensity than those that appear in ZSM-5 catalysts, indicating the peaks of Co 3 O 4 appear and overlap with the corresponding peaks of ZSM-5 at the same Bragg angle. Concerning the Mo/ZSM-5 catalyst, new peaks appear at 2θ = 25.7, 27.4, 33.7, and 38.8 • , corresponding to α-MoO 3 (orthorhombic MoO 3 ) (JCPDS-05-0508) [17][18][19]. It can be seen that the peak at 2θ = 25.7 • in the Mo/ZSM-5 catalyst overlaps with the peak in ZSM-5, in which the peak in Mo/ZSM-5 is higher than in the ZSM-5 catalyst.…”

Section: Catalysts Characterizationsmentioning

confidence: 99%

Improved Brønsted to Lewis (B/L) Ratio of Co- and Mo-Impregnated ZSM-5 Catalysts for Palm Oil Conversion to Hydrocarbon-Rich Biofuels

et al. 2021

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The purposes of this study are to investigate the effect of metal (Co and Mo) impregnation to ZSM-5 catalysts on the Brønsted to Lewis (B/L) ratio as the active sites of cracking reaction, and the catalysts’ performance testing for palm oil cracking to produce hydrocarbon-rich biofuels. Both metals were impregnated on the ZSM-5 catalyst using a wet-impregnation method. The catalysts were characterized using X-ray diffraction (XRD), X-ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), Brunauer–Emmett–Teller (BET), and Pyridine-probed Fourier-Transform Infrared (Py-FTIR) spectroscopy methods. The catalysts were tested on the cracking process of palm oil to biofuels in a continuous fixed-bed catalytic reactor. In order to determine the composition of the organic liquid product (OLP, biofuels), the product was analyzed using a gas chromatography-mass spectrometry (GC-MS) method. The results showed that the co-impregnation of Co and Mo to ZSM-5 highly increased the Brønsted to Lewis acid site (B/L) ratio, although the total number of acid sites decreased. However, the impregnation of Co and Mo on the ZSM-5 decreased the surface area of catalysts due to pore blocking by metals, while the B/L ratio of the catalysts increased. It was obtained that by utilizing Co- and Mo-impregnated ZSM-5 catalysts, the hydrocarbons product selectivity increased from 84.32% to 95.26%; however, the yield of biofuels decreased from 67.57% to 41.35%. The increase in hydrocarbons product selectivity was caused by the improvement of the Brønsted to Lewis (B/L) acid sites ratio.

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Section: Catalysts Characterizationsmentioning

confidence: 99%

Improved Brønsted to Lewis (B/L) Ratio of Co- and Mo-Impregnated ZSM-5 Catalysts for Palm Oil Conversion to Hydrocarbon-Rich Biofuels

et al. 2021

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“…It is in recent years that the interest in heterogeneous catalysts has grown and the replacement of conventional toxic and polluting Brønsted and Lewis acid catalysts by solid acid heterogeneous catalysts has achieved an important role in the synthesis of 3,4-dihydropyrimidinones [ 11 ]. Thus, many examples of solid acid catalysts have been reported in the literature for performing the Biginelli reaction with variable success, such as: acid activated montmorillonite clay, cobalt supported on alumina, molybdenum supported on silica, FeCl 3 supported on polyaniline [ 12 , 13 , 14 , 15 ]. It has been reported that in the Biginelli reaction, a catalyst not only provides better yields and reaction times, but is also fundamental in improving the selectivity towards one reaction pathway.…”

Section: Introductionmentioning

confidence: 99%

Efficient One-Pot Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones via a Three-Component Biginelli Reaction

et al. 2021

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Multicomponent reactions are considered to be of increasing importance as time progresses due to the economic and environmental advantages such strategies entail. The three-component Biginelli reaction involves the combination of an aldehyde, a β-ketoester and urea to produce 3,4-dihydropyrimidin-2(1H)-ones, also known as DHPMs. The synthesis of these products is highly important due to their myriad of medicinal properties, amongst them acting as calcium channel blockers and antihypertensive and anti-inflammatory agents. In this study, silicotungstic acid supported on Ambelyst-15 was used as a heterogeneous catalyst for the Biginelli reaction under solventless conditions. Electron-poor aromatic aldehydes gave the best results. Sterically hindered β-ketoesters resulted in lower reaction yields. The reaction was carried out under heterogeneous catalysis to allow easy recovery of the product from the reaction mixture and recycling of the catalyst. The heterogeneity of the reaction was confirmed by carrying out a hot filtration test.

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Polymer Supported Ferric Chloride as Heterogeneous Catalyst for Three Component Biginelli Reaction

Gujarati,

Bedekar,

Patel

et al. 2024

Catal Lett

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Clean 3,4-Dihydropyrimidones Synthesis via Biginelli Reaction over Supported Molybdenum: Structural and Textural Characteristic of αMoO3

Cited by 4 publications

References 0 publications

Improved Brønsted to Lewis (B/L) Ratio of Co- and Mo-Impregnated ZSM-5 Catalysts for Palm Oil Conversion to Hydrocarbon-Rich Biofuels

Improved Brønsted to Lewis (B/L) Ratio of Co- and Mo-Impregnated ZSM-5 Catalysts for Palm Oil Conversion to Hydrocarbon-Rich Biofuels

Efficient One-Pot Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones via a Three-Component Biginelli Reaction

Polymer Supported Ferric Chloride as Heterogeneous Catalyst for Three Component Biginelli Reaction

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