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Heterogeneous catalyst

Tìm thấy 20+ kết quả cho từ khóa "Heterogeneous catalyst"

Synthesis and application of polyvinylimidazole-based Brønsted acidic ionic liquid grafted silica as an efficient heterogeneous catalyst in the preparation of quinoxaline derivatives

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Synthesis and application of polyvinylimidazole-based Brønsted acidic ionic liquid grafted silica as an efficient heterogeneous catalyst in the preparation of. quinoxaline derivatives. Abstract: Two types of polymer-grafted silica based on polyvinylimidazole Brønsted acidic ionic liquids were prepared and used as new heterogeneous catalysts for the preparation of pharmaceutically important quinoxaline derivatives..

Hydrotalcite framework stabilized ruthenium nanoparticles (Ru/HTaL): Efficient heterogeneous catalyst for the methanolysis of ammonia-borane

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Moreover, the catalytic stability tests of Ru/HTaL in AB methanolysis showed that Ru/HTaL acts as a highly stable and reusable heterogeneous catalyst in this reaction by preserving more than 95% of its initial activity even at the 5th recycle..

Nanocomposite copper metal as an efficient heterogeneous catalyst in click synthesis of 1,2,3-triazoles in aqueous media

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Nanocomposite copper metal as an efficient heterogeneous catalyst in click synthesis of 1,2,3-triazoles in aqueous media. The reaction proceeds by mixing organohalides, sodium azide, alkyne, and the catalyst in an aqueous medium to afford the desired products. The cost efficiency and recyclability of the catalyst up to six runs without appreciable loss of activity and high yields of products make this procedure greener..

Poly(4-vinylpyridine)-supported dual acidic ionic liquid: an environmentally friendly heterogeneous catalyst for the one-pot synthesis of 4,4’-(arylmethylene)bis(3-methyl-1-phenyl-1H-pyrazol-5-ols)

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Poly(4-vinylpyridine)-supported dual acidic ionic liquid: an environmentally friendly heterogeneous catalyst for the one-pot synthesis of.

Poly(N-vinylimidazole): A biocompatible and biodegradable functional polymer, metal-free, and highly recyclable heterogeneous catalyst for the mechanochemical synthesis of oximes

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Poly(N-vinylimidazole) as an efficient catalyst for acetylation of alcohols, phenols, thiols and amines under solvent-free conditions. doi: 10.1039/C2RA21295A. Aldol condensations of a variety of different aldehydes and ketones under ultrasonic irradiation using poly(N- vinylimidazole) as a new heterogeneous base catalyst under solvent-free conditions in a liquid-solid system. doi: 10.1016/S .

The promoted synthesis of minoxidil by magnetic nanoparticles of cobalt ferrite (CoFe2O4) as a heterogeneous reusable catalyst

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/Mg(OH) 2 nanocomposite as an efficient heterogeneous catalyst for regioselective one-pot synthesis of β - chloroacetates from epoxides. doi: 10.1002/aoc.4520 20. ef?cient and reusable heterogeneous catalyst for the green synthesis of thiiranes from epoxides with thiourea.. Synthesis of Fe 3 O 4 nanoparticles with various sizes and mag-. 10.1016/j.jcis . Synthesis and characterization of CoFe 2 O 4 ferrite nanoparticles obtained by an electrochemical method. doi: 10.1021/jp907745v.

Heterogeneous Fenton-like degradation of Acid Red 17 using Fe-impregnated nanoporous clinoptilolite: artificial neural network modeling and phytotoxicological studies

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The degradation efficiency of AR17 by the Fenton-like process with NP-Clin and Fe-NP-Clin as heterogeneous catalysts was 43.5% and 97.6%, respectively. Therefore, Fe-NP-Clin was selected as a heterogeneous catalyst for further experiments.. Decolorization efficiency of AR17 in different oxidation processes (a): Heterogeneous Fenton with Fe-NP- Clin. (b): Heterogeneous Fenton with NP-Clin. (c) Adsorption onto Fe-NP-Clin sample.

Exploration of efficiency of nano calcium oxide (CAO) as catalyst for enhancement of biodiesel production

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Inorganic heterogeneous catalysts offer abundant benefits relative to either inorganic homogenous or organic catalyst including ease of separation, recovery of catalyst, reusability of catalyst, cheap and minimized corrosion (Mazaheri et al., 2018. Bhuyar et al., 2019).. Among the heterogeneous catalyst that was used in transesterification reaction, calcium oxide, CaO proven to be highly effective catalyst in biodiesel production by many literature studies.

Three-component synthesis of cyclic β-aminoesters using CeO2 nanoparticles as an efficient and reusable catalyst

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The high surface area of the nanoparticles is responsible for their catalytic activity. characteristics, 14 and as a major component of catalyst formulation for the dehydrogenation of ethylbenzene to styrene. 15 Recently, cerium nanoparticles were used as an expedient catalyst in many reactions including synthesis of cyclic ureas, 16 polyhydroquinolines, 17 and 1,4-disubstituted-1,2,3-triazoles. 18 Our research group has reported that CeO 2 nanoparticles act as an efficient heterogeneous catalyst for

Selective oxidation of sulfides and hydrocarbons with H2O2 over manganese catalyst supported on nanoparticles

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Comparison of the homogeneous and heterogeneous systems reveals that the heterogeneous catalysts exhibited lower activity than the homogeneous catalyst (Table 8, entries 1–3). Various homogeneous and heterogeneous Mn catalysts have been used for the oxidation of cycloalkanes with H 2 O 2 and t-BuOOH. 47,48 However, none of the reported catalysts showed such high activity and/or selectivity as [Mn 2 (HL) 2 (H 2 O) 4 ] or Fe 3 O 4 @SiO 2 /[Mn 2 L(HL)(H 2 O) 4.

Ranolazine-functionalized CuO NPs: Efficient homogeneous and heterogeneous catalysts for reduction of 4-nitrophenol

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Titania-supported silver nanoparticles: an efficient and reusable catalyst for reduction of 4-nitrophenol

Advances in polymer based Friedlander quinoline synthesis

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Friedländer synthesis of poly-substituted quinolines using a highly efficient and reusable heterogeneous catalyst. Titania nanomaterials: Efficient and recyclable heterogeneous catalysts for the solvent-free synthesis of poly-substituted quinolines via Friedlander hetero-annulation. A mild and highly efficient Friedländer synthesis of quinolines in the presence of heterogeneous solid acid nano-catalyst.

Green and efficient synthesis of novel bispyrazoles through a tandem Knoevenagel and Michael type reaction using nanowire zinc oxide as a powerful and recyclable catalyst

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XRD (D 8 , Advance, Bruker, AXS) patterns were obtained for characterization of the heterogeneous catalyst. TEM study of the nanostructures was carried out with a JEOL JEM 3010 instrument operating at an accelerating voltage of 300 kV.

Preparation and characterization of nano MnO-CaLs as a green catalyst for oxidation of styrene

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The highest amount of the desired product after 2 h is observed at a concentration of 3% of the catalyst. Effect of time and amount of catalyst on selectivity of styrene epoxide (Se sep. Recyclability of the catalyst. The recyclability of catalyst is one of the crucial factors for a prominent heterogeneous catalyst from economic and environmental points of view.

Reusability and regeneration of solid catalysts used in ultrasound assisted biodiesel production

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Key words: Biodiesel, ultrasound assisted transesterification, calcium oxide, calcined dolomite, heterogeneous catalyst regeneration Received Accepted/Published Online Final Version . catalyst, KF/CaO–Fe 3 O 4 , using an impregnation method for biodiesel production and reused the catalyst 16 times [13].

Efficient C–C cross-coupling reactions by (isatin)-Schiff base functionalized magnetic nanoparticle-supported Cu(II) acetate as a magnetically recoverable catalyst

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Leaching tests after each catalytic run in iodobenzene and methylacrylate coupling as a model reaction under optimized conditions revealed that the amount of Cu leached from the heterogeneous catalyst was negligible (less than 0.2 ppm) as determined by ICP-AES of the clear filtrate. The fresh reagents were then added to the filtrated solution..

Activation of peroxymonosulfate by cobaltimpregnated biochar (Co-SCG) for efficient degradation of tetracycline in water

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CoMoO 4 as a novel heterogeneous catalyst of peroxymonosulfate activation for the degradation of organic dyes. 10.1039/C7RA04761D.. Degradation of antibiotics amoxicillin by Co 3 O 4 ‐catalyzed peroxymonosulfate system. https://doi.org/10.1002/ep.10633..

BẢNG TÓM TẮT ĐỀ TÀI NGHIÊN CỨU "Nghiên Cứu Tổng Hợp Họ Vật Liệu MOF-Cu và Khảo Sát Hoạt Tính

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Nguyen, L.T.L., et al., Metal–organic framework MOF-199 as an efficient heterogeneous catalyst for the aza-Michael reaction. Phan, N.T.S., et al., Paal–Knorr reaction catalyzed by metal–organic framework IRMOF-3 as an efficient and reusable heterogeneous catalyst. Ta, The arylation of aldehydes with arylboronic acids using metal-organic framework Ni(HBTC)BPY as an efficient heterogeneous catalyst. Cohen, S.M., Postsynthetic Methods for the Functionalization of Metal–Organic Frameworks.

Synthesis and exploration of catalytic activity of Fe - Mil 101 material in friedel crafts benzoylation reaction

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In addition, Fe-MIL-101 is a heterogeneous catalyst which succeeds in not only shortening duration in a significant amount, but also increasing conversion with the assistance of the microwave irradiation compared with the conventional heating. Fe-MIL-101 would be a very potential alternative in place of unfavourable and dated iron (III) chloride homogeneous catalyst, due to its thermal stability, moreover, it can be recovered and reused after aqueous work-up..

Nghiên cứu tổng hợp Matyl este và alkyl lactat làm tiền chất pha chế dung môi sinh học để tẩy mực in trên bao bì polyme

000000105399-TT.pdf.pdf

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In this thesis, we have studied and created heterogeneous catalyst NaOH/MgO to synthesize methyl ester in active phase with 15% and have researched physical chemistry properties of this catalyst. Methyl ester has been synthesized under optimal conditions: methanol/oil: 1/3 (in volumetric), catalyst: 3%, reaction temperature: 60oC, reaction period : 4h, agitating speed : 600 rounds/minute.