Category: 539-88-8

Srinivasa Rao, B. published the artcileDehydrative etherification of carbohydrates to 5-ethoxymethylfurfural over SBA-15-supported Sn-modified heteropolysilicate catalysts, COA of Formula: C7H12O3, the main research area is carbohydrate ethoxymethylfurfural silica tin heteropolysilicate catalyst dehydrative etherification.

Dehydration followed by the alcoholysis of glucose/fructose to 5-ethoxymethylfurfural (EMF) was carried out over SBA-15-supported tin-modified heteropolysilicate (SnSTA) catalysts. The physico-chem. properties of the catalysts were explored by X-ray diffraction, Fourier-transform IR spectroscopy (FT-IR), pyridine-adsorbed FT-IR spectroscopy, transmission electron microscopy (TEM), N2 physisorption, laser Raman and NH3 temperature-programmed desorption techniques. The characterization results confirmed that the Sn-exchanged STA species were productively embedded inside the pores of SBA-15 without disturbing the parent hexagonal structure. High conversion and selectivity towards EMF were achieved with 20 wt% Sn0.75STA on SBA-15. The high activity of the catalyst could be attributed to the well-dispersed intact Keggin Sn0.75STA on the support, which led to the generation of sufficient Bronsted and Lewis acidic sites. The influence of various reaction parameters such as catalyst weight, reaction temperature, and time was studied along with the stability and reusability of the catalyst.

Sustainable Energy & Fuels published new progress about Absorption. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, COA of Formula: C7H12O3.

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

Munoz-Olasagasti, M. published the artcileThe relevance of Lewis acid sites on the gas phase reaction of levulinic acid into ethyl valerate using CoSBA-xAl bifunctional catalysts, SDS of cas: 539-88-8, the main research area is levulinic acid ethyl valerate bifunctional catalyst gas phase reaction.

A series of Co supported on Al-modified SBA-15 catalysts has been studied in the gas phase direct transformation of levulinic acid (LA) into Et valerate (EV) using a continuous fixed-bed reactor and ethanol as solvent. It was observed that once the intermediate product gamma-valerolactone (GVL) has been formed, the presence of aluminum is required for the selective transformation to EV. Three Lewis acid sites (LAS) are identified (from highest to lowest acid strength): aluminum ions in tetrahedral and octahedral coordination and Co+ sites. The intrinsic activity of these LAS for the key reaction, the GVL ring opening, decreases with the strength of these acid sites, but so does the undesirable formation of coke, also catalyzed by these centers. The best catalyst was that with the highest Al content, CoSBA-2.5Al, that reached an EV yield of up to 70%. This result is associated with the presence of LAS attributed to the presence of Co+ surface species that, although having low intrinsic activity in the selective GVL ring-opening reaction, are highly concentrated in this sample and also possess less activity in the undesirable and deactivating formation of coke. These Co2+ LAS have been stabilized by incorporation of aluminum into the support, modifying the reducibility and dispersion of cobalt species. Addnl., the lower proportion of metallic Co species decreases the hydrogenating capacity of this catalyst. This decrease is a pos. result because it prevents GVL hydrogenation to undesired products. This catalyst also showed promising stability in a 140 h onstream run.

Catalysis Science & Technology published new progress about Absorption. 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

Golubeva, Maria A. published the artcileSelective production of γ-valerolactone and ethyl valerate from ethyl levulinate using unsupported nickel phosphide, COA of Formula: C7H12O3, the main research area is valerolactone ethyl valerate levulinate nickel phosphide.

Unsupported nickel phosphide catalyst containing Ni2P phase was applied in the hydrodeoxygenation of Et levulinate in ethanol medium for the first time. The obtained catalyst was investigated by XRF, XRD, NH3-TPD, XPS and TEM techniques. γ-Valerolactone and Et valerate were obtained as the hydrodeoxygenation products. Varying the temperature and the reaction time it was possible to obtain these products with high selectivity. γ-Valerolactone was selectively formed at 200-250°C and Et valerate was selectively formed at temperatures of 300-350°C. Increase in reaction time was contributed to Et valerate formation. The highest selectivity of Et valerate was 100% at full Et levulinate conversion at 350°C after 6 h. 100% γ-Valerolactone selectivity was reached at low conversion of Et levulinate. The highest yield of γ-valerolactone reached 41.7% after 6 h of the reaction at 250°C. The selectivity of γ-valerolactone was 86.9% and the conversion of Et levulinate was 48.0%.

Applied Catalysis, A: General published new progress about Deoxidation. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, COA of Formula: C7H12O3.

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

Golubeva, Maria A. published the artcileHydroprocessing of furfural over in situ generated nickel phosphide based catalysts in different solvents, SDS of cas: 539-88-8, the main research area is nickel phosphide catalyst furfural hydrodeoxygenation solvent.

The present work is dedicated to the nickel phosphide based catalysts, containing particles, generated in situ in the reaction medium from the different catalytic systems. The present catalytic systems exhibited high activity in the hydroprocessing of furfural. Full conversion of furfural depending on conditions was reached after 0.5-3 h of reaction at 250-350°C. 2-methylfuran was obtained as a main product in toluene with the highest selectivity of 77%. Et levulinate and 2-methylfuran with selectivity of 40% and 38% resp. were obtained as main products in ethanol under different conditions. Different reaction medium and nickel phosphide precursors had an influence on the obtained phases of catalysts. Ni12P5 and Ni2P were obtained in toluene from oil-soluble precursors and Ni12P5 was obtained in ethanol from water-soluble precursors.

Applied Catalysis, A: General published new progress about Deoxidation. 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

Golubeva, M. A. published the artcileIn Situ Generated Nickel Phosphide Based Catalysts for Hydroprocessing of Levulinic Acid, Formula: C7H12O3, the main research area is nickel phosphide catalyst levulinic acid hydroconversion.

This article describes the production of unsupported nickel phosphide catalysts generated in situ in a reaction mixture from water-soluble and oil-soluble precursors during the hydroconversion of levulinic acid. These catalysts contain crystalline phases, specifically Ni12P5 and Ni(PO3)2. During the hydrogenation of levulinic acid in toluene in the presence of NiP-TOP, a lower temperature and a shorter reaction time contribute to the formation of γ-valerolactone (100% selectivity). A higher temperature and a longer reaction time favor the formation of valeric acid (94% selectivity). In the hydrogenation of levulinic acid in ethanol in the presence of NiP-H3PO2, the main reaction product is Et levulinate (95% selectivity).

Petroleum Chemistry published new progress about Deoxidation. 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

von Keutz, Timo published the artcileContinuous Flow Synthesis of Terminal Epoxides from Ketones Using in Situ Generated Bromomethyl Lithium, Computed Properties of 539-88-8, the main research area is epoxide preparation continuous flow; ketone epoxidation bromomethyl lithium.

A scalable procedure for the direct preparation of epoxides from ketones has been developed. The method is based on the carefully controlled generation of (bromomethyl)lithium (LiCH2Br) from inexpensive CH2Br2 and MeLi in a continuous flow reactor. The reaction has shown excellent selectivity for a variety of substrates, including α-chloroketones, which typically fail under classic Corey-Chaykovsky conditions. This advantage has been used to develop a novel route toward the drug fluconazole.

Organic Letters published new progress about Epoxidation. 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

Wen, Zhe published the artcileCatalytic ethanolysis of microcrystalline cellulose over a sulfonated hydrothermal carbon catalyst, Category: esters-buliding-blocks, the main research area is catalytic ethanolysis microcrystalline cellulose sulfonated hydrothermal carbon catalyst.

The catalytic ethanolysis of microcrystalline cellulose in supercritical ethanol is examined over a sulfonated hydrothermal carbon catalyst (SHTC). SHTC is amorphous carbon containing -OH, -COOH and -SO3H groups with total acidity of 7.15 mmol/g and -SO3H acidity of 1.72 mmol/g. SHTC shows high catalytic activity towards the ethanolysis of cellulose in supercritical ethanol. Complete conversion of microcrystalline cellulose with high yields of Et levulinate and Et glucoside is obtained. The reaction temperature, time and catalyst amount have significant effects on the catalytic performances of SHTC. Appropriate reaction time and less catalyst amount are favorable for the production of Et glucoside, while prolonged reaction time and appropriate catalyst amount favor the production of Et levulinate. The highest yield of Et glucoside as 420.9 mg/g cellulose is obtained over 0.1 g SHTC at 245°C for 1 h. The highest yield of Et levulinate as 817.6 mg/g cellulose is achieved over 0.3 g SHTC at 245°C for 1 h. SHTC shows good stability in the recycle experiments with slight loss of catalytic activity.

Catalysis Today published new progress about Ethanolysis. 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

Zhang, Zhi published the artcilePreparation and characterisation of ordered mesoporous SO2-4/Al2O3 and its catalytic activity in the conversion of furfuryl alcohol to ethyl levulinate, Application In Synthesis of 539-88-8, the main research area is mesoporous SO24 Al2O3 catalytic furfuryl alc ethyl levulinate.

A series of ordered mesoporous SO42-/Al2O3 (OMSA) solid super acid catalysts were prepared by evaporation-induced self-assembly (EISA) method, followed by sulfonation at different calcination temperatures (400°C-900 °C). The results of transmission electron microscopy (TEM) and small-angle X-ray diffraction (XRD) indicated that all of the OMSAs possessed ordered mesoporous structures. The N2-Brunauer-Emmett-Teller (N2-BET) results showed that the sp. surface area of OMSAs could reach up to 160-380 m2/g, and the average pore diameters fall into the range between 8.6 and 9.8 nm. The temperature-programmed desorption of ammonia (NH3-TPD) characterization proofed that the OMSAs contained super acid, and ammonia desorption by the super acid in the OMSA calcined at 600 °C reached 25.9 cm3/g STP. The pyridine adsorption IR (Py-IR) indicated that all of the OMSAs consisted mainly of Lewis acids. The OMSA was used to catalyze furfuryl alc. in the synthesis of Et levulinate (EL). The maximum yield (80.6%) was obtained in the reaction conducted at 200 °C for 3 h. The reusability of the catalyst was proofed after four times of reuse as its activity was maintained with a yield of 71.2%.

Journal of Solid State Chemistry published new progress about Ethanolysis. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application In Synthesis of 539-88-8.

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

Zhao, Kangyu published the artcileHighly efficient one-step conversion of fructose to biofuel 5-ethoxymethylfurfural using a UIO-66-SO3H catalyst, Related Products of esters-buliding-blocks, the main research area is fructose biofuel ethoxymethylfurfural sulfonic acid functionalized UIO MOF catalyst; 5-ethoxymethylfurfural; biomass; catalysis; fructose; one-step conversion.

In this study, a novel sulfonic acid-modified catalyst for MOFs (UIO-66-SO3H) was synthesized using chlorosulfonic acid as a sulfonating reagent and first used as efficient heterogeneous catalysts for the one-pot conversion of fructose into biofuel 5-ethoxymethylfurfural (EMF) in a cosolventfree system. The physicochem. properties of this catalyst were characterized by Fourier transform IR spectroscopy (FT-IR), transmission electron microscopy (TEM), and powder X-ray diffraction (XRD). The characterization demonstrated that the sulfonic acid group was successfully grafted onto the MOF material and did not cause significant changes to its morphol. and structure. Furthermore, the effects of catalyst acid amount, reaction temperature, reaction time, and catalyst dosage on reaction results were investigated. The results showed that the conversion of fructose was 99.7% within 1 h at 140°C, while the EMF yield reached 80.4%. This work provides a viable strategy by application of sulfonic acid-based MOFs for the efficient synthesis of potential liquid fuel EMF from renewable biomass.

Frontiers in Chemistry (Lausanne, Switzerland) published new progress about Alcoholysis. 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

Li, Mengzhu published the artcileCascade conversion of furfural to fuel bioadditive ethyl levulinate over bifunctional zirconium-based catalysts, Application In Synthesis of 539-88-8, the main research area is furfural ethyl levulinate zirconium fuel bioadditive catalyst.

Biomass-derived Et levulinate (EL) is currently deemed as a promising fuel bioadditive to improve (bio)diesel combustion performance without the sacrifice of its octane number In this contribution, a range of Zr-Al bimetallic catalysts were prepared for the cascade conversion of furfural to EL by the integration of transfer hydrogenation and ethanolysis in ethanol. The ratio of Lewis to Bronsted acid sites (L/B) could be tuned by the ratio of Al2O3 to ZrO2 over SBA-15 support. Among these catalysts, Zr-Al/SBA-15(30:10) with appropriate L/B ratio of 2.25 exhibited an outstanding catalytic performance to give a furfural (FF) conversion up to 92.8% with a EL selectivity as high as 71.4% at 453 K in 3 h.

Renewable Energy published new progress about Alcoholysis. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application In Synthesis of 539-88-8.

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