Tag: M.W=100-150

Wang, Ding-kai published the artcilePreparation of ethyl levulinate from wheat stalk over Zr(SO4)2/SiO2, HPLC of Formula: 539-88-8, the main research area is catalyst dosage wheat stalk ethyl levulinate; Ethyl levulinate; glucose; solid acid Zr(SO4)2/SiO2; wheat stalk.

A series of Zr(SO4)2/SiO2 solid acid catalysts with different Zr(SO4)2 loadings were prepared by water-soluble-impregnation method at room temperature Then, the prepared catalysts were characterized by Fourier transform IR spectroscopy, transmission electron microscopy and energy-dispersive X-ray spectrum, X-ray diffraction, adsorption/desorption of N2, and temperature programmed desorption of NH3. The results showed that the active component Zr(SO4)2 was successfully adhered to the mesoporous SiO2, and the acid amount of Zr(SO4)2/SiO2 increased with the increasing of the Zr(SO4)2 loadings. Finally, the wheat stalk was used as raw material and depolymerized over Zr(SO4)2/SiO2 to produce Et levulinate (EL). The reaction mixture was separated and purified by filtration and vacuum distillation The kinetic characteristics and the reaction pathway were also studied. A comparative study showed that 20 weight% Zr(SO4)2/SiO2 exhibited higher catalytic activity. When reaction temperature, time, catalyst dosage and Zr(SO4)2 loadings were 190°C, 50 min, 20 weight% and 30 weight%, the EL yield reached a maximum of 17.14%. The relative content of EL exceeded 90% after three steps of distillation

Turkish Journal of Chemistry published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, HPLC of Formula: 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hu, Lei published the artcileZirconium-Containing Organic-Inorganic Nanohybrid as a Highly Efficient Catalyst for the Selective Synthesis of Biomass-Derived 2,5-Dihydroxymethylfuran in Isopropanol, SDS of cas: 539-88-8, the main research area is zirconium organic inorganic nanohybrid catalyst biomass dihydroxymethylfuran isopropanol.

By the simple assembly of zirconium tetrachloride and diethylenetriaminepentaacetic acid (DTPA), a new acid-base bifunctional zirconium-containing organic-inorganic nanohybrid catalyst (Zr-DTPA) was successfully prepared in this work, and then used for the catalytic transfer hydrogenation (CTH) of biomass-derived 5-hydroxymethylfurfural (HMF) into 2,5-dihydroxymethylfuran (DHMF) using isopropanol as the in situ hydrogen donor and reaction solvent. Satisfactorily, 98.7% HMF conversion and 95.2% DHMF yield could be achieved in 4 h at a moderate reaction temperature of 140°C. After systematic studies, this excellent catalytic activity was proved to be mainly ascribed to the synergistic effect of Lewis-acidic sites (Zr4+) and Lewis-basic sites (O2- and N) with higher strengths and contents. Meanwhile, Zr-DTPA could be readily separated by filtration, when it was repeatedly used 5 recycles, its catalytic activity was not obviously changed, demonstrating that Zr-DTPA had good heterogeneity and reusability. More importantly, Zr-DTPA could also be employed to effectively catalyze the CTH of 5-methylfurfural, furfural, levulinic acid, Et levulinate and cyclohexanone into the corresponding products with high yields, indicating that it showed a superior universality for the selective hydrogenation of various biomass-derived carbonyl compounds

Waste and Biomass Valorization published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Shao, Yuewen published the artcileSulfated TiO2 nanosheets catalyzing conversion of biomass derivatives: influences of the sulfation on distribution of Bronsted and Lewis acidic sites, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is sulfated titanium oxide biomass conversion Bronsted Lewis acidic site.

The synthesis of solid acid catalysts of recoverable and environmentally friendly nature has gained increasing attention in recent years. The distribution of Bronsted and Lewis acidic sites on the surface of sulfated metal oxides determines the catalytic performance, which is affected by many key factors, such as the concentration of sulfuric acid impregnated and the morphol. of the metal oxides used. In this study, TiO2 nanosheets were successfully synthesized and used as carrier for the preparation of solid acid catalysts. The concentration of sulfuric acid for the impregnation resulted in various distributions of Bronsted and Lewis acidic sites on the surface of sulfated TiO2. With a medium concentration of sulfuric acid (1 mol L-1) for the impregnation, the highest ratio of Bronsted to Lewis acidic sites can be achieved, and the catalyst showed superior catalytic activity for the conversion of furfuryl alc. (FA) to Et levulinate (EL) in ethanol and the conversion of fructose to 5-hydroxymethylfurfural (HMF) in DMSO (DMSO). The sulfation of TiO2 nanosheets induced the formation of both Bronsted and Lewis acidic sites. The Bronsted acidic sites were more effective for catalyzing the conversion of FA or fructose. The poor recyclability of the 1.0-SO42-/TiO2 catalyst in the conversion of FA to EL in ethanol, a protic solvent, was due to the leaching of sulfur species. The deactivation of the catalyst in DMSO was due to coking, which could be resolved via calcination of the coke species in air.

Journal of Chemical Technology and Biotechnology published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Recommanded Product: Ethyl 4-oxopentanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Lai, Fengjiao published the artcileEfficient one-pot synthesis of ethyl levulinate from carbohydrates catalyzed by Wells-Dawson heteropolyacid supported on Ce-Si pillared montmorillonite, Category: esters-buliding-blocks, the main research area is carbohydrate ethyl levulinate heteropolyacid cerium silicon montmorillonite.

Efficient conversion of biomass-derived carbohydrates to alkyl levulinates is an important goal of biorefinery process, but is still challenging on applicable catalyst. Ce-Si pillared montmorillonite (CeSiM) clay heterostructures, incorporated with Wells-Dawson tungstophosphoric acid (H6P2W18O64, DPW), were prepared for the first time and used as the multifunctional catalyst for direct production of Et levulinate (EL) from various biomass-derived sugars. The DPW introduced by sol-gel method (DPW-CeSiM) has been effectively incorporated into the framework of porous CeSiM, while part of DPW was just absorbed on the surface of CeSiM by impregnation method (DPW-CeSiM-I). The DPW-CeSiM catalyst has large sp. surface area owing to the insertion of Ce-Si pillars, and possesses strong Bronsted acidity and moderate Lewis acidity originated from the incorporated DPW and the Ce-doping, resp. Due to the well synergistic effect of porous structure and dual acid, the DPW-CeSiM catalyst efficiently catalyzed the conversion of glucose into EL with 56.2% yield and nearly 100% conversion at 170°C for 4 h. The recyclability studies certified that DPW-CeSiM catalyst showed higher stability than DPW-CeSiM-I over cycles and could be easily recovered from consecutive alcoholysis of biomass-derived sugars. The DPW-CeSiM catalyst also displayed high activity toward the conversion of other biomass-derived carbohydrates (fructose, sucrose, cellobiose and cellulose) into EL. Therefore, this work provides an instructive strategy for the design of efficient and stable DPW-based catalysts with dual acid sites uniformly distributed over the porous structure, which is obviously potential for industrial production of alkyl levulinates from carbohydrates and biomass.

Journal of Cleaner Production published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Karnjanakom, Surachai published the artcileStudy of a recycling reaction system for catalytic transformation of biomass-based carbohydrates via acidic-polar biphasic conditions, Name: Ethyl 4-oxopentanoate, the main research area is catalytic transformation carbohydrate biomass acidic polar biphasic condition.

Et levulinate (EL) was produced via one-pot conversion of biomass-based carbohydrates under a reusable biphasic system over a solid acid catalyst. In situ EL synthesis and extraction occurred during the reaction, resulting from the addition of a small amount of inorganic NaCl salt. The possible behavior of EL formation was described in detail. No serious reduction in the turnover rate of sucrose conversion was found during the recycling process.

Reaction Chemistry & Engineering published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Name: Ethyl 4-oxopentanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Chen, Han published the artcileCatalytic Transfer Hydrogenation of Ethyl Levulinate to γ-Valerolactone Over Ni Supported on Equilibrium Fluid-Catalytic-Cracking Catalysts, Related Products of esters-buliding-blocks, the main research area is catalytic transfer hydrogenation ethyl levulinate gamma valerolactone.

Nickel supported on equilibrium fluid-catalytic-cracking catalysts (Ni/E-cats) were prepared by a simple grinding-pyrolysis method and employed for the transfer hydrogenation of Et levulinate (EL) to γ-valerolactone (GVL). 96.2% selectivity of GVL and 90.3% conversion of EL were obtained at 180°C for 6 h over 30-Ni/E-cat. Through XRD, N2 adsorption-desorption, NH3-TPD and SEM anal., the high activity of the 30-Ni/E-cat catalyst was attributed to its dispersed Ni metal active centers and available acidic sites. Catalytic probe test revealed that metal and acid sites of Ni/E-cat played a synergistic catalytic role in the synthesis of GVL in 2-propanol, where Ni metal sites contribute to the hydrogenation of ketone group in EL, and acid sites of E-cat promoted the lactonization of intermediate ethyl- or iso-Pr 4-hydroxyvalerate. Two reaction pathways and synergistic mechanism were proposed in this catalytic system. Moreover, Ni/E-cat catalyst exhibited good stability up to four cycles without obvious loss of catalytic activity.

Catalysis Letters published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Related Products of esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zainol, Muzakkir Mohammad published the artcileBio-fuel additive synthesized from levulinic acid using ionic liquid-furfural based carbon catalyst: Kinetic, thermodynamic and mechanism studies, Formula: C7H12O3, the main research area is biofuel levulinic acid ionic liquid carbon catalyst thermodn kinetics.

The Et levulinate is one of promising platform chem. from biomass and commonly involved the esterification reaction of levulinic acid. The reactions are extensively focussed on the catalytic performance by various catalysts and presented limited work on the kinetic, thermodn. and mechanism study for heterogeneous catalyst reaction. To fill this gap, the reaction anal. over a new ionic liquid-furfural carbon catalyst has been investigated in this work. The math. equations were derived to determine the kinetic-thermodn. parameters, and proposed suitable mechanism for the reaction. Pseudo-first order model presents high correlation coefficient and accuracy with the reaction rate constant of 0.0037-0.0127 min-1 and Ea = 17.3 kJ/mol. The reaction is endothermic and non-spontaneous with ordered system at transition state. The proposed combined nucleophilic substitution and Eley-Rideal mechanism is comprised of SN2 steps and heterogeneous catalytic reaction. The results provide insights on the reaction for future designing and scaling-up the esterification process.

Chemical Engineering Science published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hu, Aiyun published the artcileNovel Sulfonic Acid Polystyrene Microspheres for Alcoholysis of Furfuryl Alcohol to Ethyl Levulinate, Computed Properties of 539-88-8, the main research area is furfuryl alc ethyl levulinate polystyrene microsphere structural property.

In order to further improve the catalytic activity and stability of heterogeneous acid catalysts, a polystyrene microspheres modified sulfonic acid-based catalyst (PS-SO3H) was prepared PS-SO3H was characterized by Fourier transform IR spectroscopy, powder X-ray diffraction, scanning electron microscope, transmission electron microscope, N2 adsorption-desorption, and XPS. Catalytic efficiency was determined using the reaction of furfuryl alcoholysis to Et levulinate (EL). The obtained results showed that PS-SO3H had excellent catalytic performance, with EL yield of 94.7%. In addition, PS-SO3H was easily separated from the reaction system and recycled multiple times without significant reduction in activity. High catalytic activity stemmed from the effect of Bronsted acid sites and appropriate structural properties.

Catalysis Letters published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Computed Properties of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Peng, Lincai published the artcileMechanistic insights into the effect of the feed concentration on product formation during acid-catalyzed conversion of glucose in ethanol, Synthetic Route of 539-88-8, the main research area is acid catalyzed conversion glucose mechanistic study.

Catalytic upgradation of carbohydrates in concentrated feeds well conforms to the demands for the industrial deployment of bio-based fuels and chems., but the majority of existing explorations merely focused on the utilization of dilute feedstock. In this contribution, the degradation behavior of both dilute (20 g L-1) and concentrated glucose (200 g L-1) in an ethanol medium was comparatively investigated by acid catalysis. The increase of the glucose concentration from 20 to 200 g L-1 largely boosted the formation of water-soluble oligomers (WSO) instead of solid humins (SHU). The high initial glucose concentration favored the formation of glucose oligomers, and the high instantaneous concentration of EL and 5-hydroxymethylfurfural (HMF) also exacerbated the polymerization reactions, both of which are responsible for the formation of excessive WSO in a concentrated feed. Structural characterization revealed that substituted furans, 2,5-dioxo-6-hydroxyhexanal (DHH) and its analog are the main fragments in WSO20, while WSO200 largely consisted of glucosyl units as well as furanic and aromatic fragments linked with aliphatic units, leading to the distinct structure of SHU from the two feed concentrations This work provides insights into the effect of the feed concentration on product formation during acid-catalyzed ethanolysis of glucose, facilitating the development of optimal processes for valorizing concentrated sugars.

Green Chemistry published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Synthetic Route of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Jia, Boyu published the artcileSelective production of ethyl levulinate from levulinic acid by lipase-immobilized mesoporous silica nanoflowers composite, Quality Control of 539-88-8, the main research area is ethyl levulinate levulinic acid lipase mesoporous silica nanoflower composite.

Mesoporous silica nanoflowers bearing -NH2 groups were synthesized by the hydrolysis of tetra-Et orthosilicate (TEOS) with reverse microemulsion method, following with the grafting of -NH2 groups by the post modification with (3-Aminopropyl) trimethoxysilane (APTMS). The lipase from C. antarctica was immobilized on the as-synthesized amino-grafted mesoporous silica nanoflowers to fabricate the lipase-immobilized mesoporous silica nanoflowers composite, which was applied for the catalytic transformation of biomass-derived levulinic acid to biofuel Et levulinate (EL), and exhibited excellent catalytic activity. An Et levulinate yield as high as 99.5% could be achieved at 40°C in 8 h reaction time, which was much higher than that catalyzed by the free lipase (67.9%) under the identical conditions. The immobilized lipase showed good stability and recyclability that Et levulinate yields above 68% could be remained after seven recycle times. This work represents a novel strategy to construct the immobilized biocatalyst for the production of bio-based chems.

Fuel Processing Technology published new progress about Adsorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Quality Control of 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics