Tag: M.W=100-150

Shin, Mi published the artcileEtherification of biomass-derived furanyl alcohols with aliphatic alcohols over silica-supported nickel phosphide catalysts: Effect of surplus P species on the acidity, Application of Ethyl 4-oxopentanoate, the main research area is etherification biomass furanyl alc aliphatic silica nickel phosphide catalyst.

The acidity of nickel phosphide (Ni2P) catalysts plays a crucial role in producing a desired hydrodeoxygenation mol. from biomass-derived substrates; yet, it has never been explored in acid-catalyzed reactions. Herein, we demonstrated the activity of silica-supported Ni2P catalyst prepared with the nominal P/Ni ratio of 2 (Ni2P/SiO2-2P) in the etherification of furanyl alcs. (particularly, 5-(hydroxymethyl)furfural) with aliphatic alcs. including ethanol. By comparing the characteristics of Ni/SiO2, PxOy/SiO2, and Ni2P/SiO2-xP (x = 0.5 and 1), Ni2P/SiO2-2P was revealed to contain the Bronsted and Lewis acid sites of which both contributed to the etherification reaction. Notably, the Bronsted acidity was associated with the surplus P species added to produce the Ni2P phase. Consequently, supported Ni2P catalysts can work in acid-catalyzed reactions if an adequate ratio of Bronsted to Lewis acid sites is provided by the amount of the surplus P species determined by adjusting the P/Ni ratio.

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

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

Oh, Shinyoung published the artcilePretreatment of bio-oil with ion exchange resin to improve fuel quality and reduce char during hydrodeoxygenation upgrading with Pt/C, Product Details of C7H12O3, the main research area is bio oil ion exchange resin pretreatment hydrodeoxygenation fuel quality; Bio-oil; Pt/C catalyst; hydrodeoxygenation; ion-exchange resin; solid acid catalyst.

To obtain high-quality biofuel, bio-oil obtained from fast pyrolysis of woody biomass was pretreated with ion exchange resin (amberlyst 36) at 50°C, 100°C, and 150°C, and then the recovered liquid product was upgraded using hydrodeoxygenation (HDO) with Pt/C at 300°C. After the two-stage upgrading, 4 types of products (gas, light oil, heavy oil, and char) were obtained. Two-immiscible liquid products were consisted of organic heavy oil, derived from bio-oil, and aqueous light oil, based on the ethanol. The mass balances of the HDO products were influenced by the pretreatment temperature Ion exchange pretreatment of bio-oil was effective in reducing the char formation during the hydrodeoxygenation (HDO) process. The pretreatment also improved the following heavy oil properties: the water content, heating value, viscosity, acidity, and oxygen level. As a parameter used to indicate the biofuel acidity, the total acid number (TAN) value, was clearly reduced from 114.5 (bio-oil) to 34.1-78.2 (heavy oils). Furthermore, the water and oxygen contents of bio-oil (21.1 and 52.6 wt%, resp.) declined after the pretreatment followed by HDO (ranged 5.1-6.9 and 19.0-25.5 wt%, resp.), thereby improving its higher heating value (HHV) from 17.2 MJ/kg (bio-oil) to 26.2-28.1 MJ/kg (heavy oils). The degree of deoxygenation (DOD) increased as the pretreatment temperature decreased, and the highest energy efficiency (79.8%) was observed after pretreatment at 100°C. In terms of catalyst deactivation during the reaction, both carbon deposition and surface cracking intensified with increasing pretreatment temperatures

Environmental Technology published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Product Details of C7H12O3.

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

Zhang, Shuai published the artcileConversion of biomass-derived levulinate esters to γ-valerolactone with a robust CuNi bimetallic catalyst, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is levulinate ester valerolactone preparation bimetallic catalyst optimization study property.

A high-performance Cu-Ni bimetallic catalyst supported on Zr-Al oxides was fabricated for catalyzing the transfer hydrogenation of levulinate esters to γ-valerolactone (GVL) under mild conditions. The Cu2Ni1/Zr3Al7Oz catalyst provided the highest Et levulinate conversion of 99% with 96.8% GVL yield at 150°C in 8 h employing 2-Bu alc. (2-BuOH) as the hydrogen source. The catalyst was also used successfully for the catalytic transfer hydrogenation (CTH) of a series of levulinate esters. Moreover, the catalyst still retained high activity after recycling for 4 times. The outstanding catalytic performance and selectivity of Cu2Ni1/Zr3Al7Oz, together with its low-cost nature, make it have great application potential as a catalyst for the fabrication of GVL on a large scale in industry.

New Journal of Chemistry published new progress about Acidity. 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

Zhang, Luxin published the artcileDirect production of ethyl levulinate from carbohydrates and biomass waste catalyzed by modified porous silica with multiple acid sites, Product Details of C7H12O3, the main research area is silica solid acid catalyst biomass precursor ethyl levulinate production.

Three modified porous silica solid acid catalysts with multiple acid sites (SO3H-Al/Silica, SO3H-Al-Zr/Silica, and SO3H-Zr/Silica) were prepared and characterized. The Pyridine-IR spectra showed that both Bronsted (B) and Lewis (L) acid sites were present in all three catalysts. Catalytic acid sites with different acid strengths were also found, including strong sulfonic acids and several weak acids. The prepared solid acid catalysts were used to catalyze the ethanolysis of glucose, glucosyl-based carbohydrates, and starchy food waste to produce Et levulinate (EL). The formation of EL was promoted by the synergistic effect between multiple acid sites on the catalysts. A higher B/L ratio and -SO3H amount promoted the production of EL. The catalytic activity was pos. correlated to the sp. surface area of the catalysts. Promising results were obtained for SO3H-Al/Silica: the maximum EL yield from glucose was 47.9%, and a small amount of 5-ethoxymethylfurfural was detected as a byproduct. Cellobiose, cellulose, expired wheat flour, and kitchen waste were also used as raw materials to produce EL, affording EL yields in the range of 1.6-38.9%. Finally, the stability of the prepared catalysts was explored after reuse and hot filtration.

Process Biochemistry (Oxford, United Kingdom) published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Product Details of C7H12O3.

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

Gao, Zhaoping published the artcileHighly efficient hydrogenation of biomass oxygenates to alcohol products on MOF composite catalysts, Product Details of C7H12O3, the main research area is copper cobalt ceria hydrogenation catalyst biomass oxygenate.

Selective hydrogenation of biomass oxygenates to valuable chems. is a desired catalytic process from energy and environment. Traditional catalysts for selective hydrogenation of biomass oxygenates are prepared from co-impregnation or co-precipitation method. In this work, 93.6% of a 1,4-pentanediol yield as well as high stability was obtained on CeO2 supported cobalt and copper species (Cu3Co1/CeO2) by pyrolyzing a MOF composite from one-pot synthesis. Comparison showed that catalytic performances on Cu3Co1/CeO2 were higher than most literature sources, Cu3Co1/CeO2-CP and individual Co0 or Cu0 on CeO2. Addnl., Cu3Co1/CeO2 also presents the yields of higher than 92.5% for γ-valerolactone, furfural, benzaldehyde, acetophenone and phenol to corresponding alc. products. Characterization results indicated high catalytic results are derived from the coexistence of highly dispersed Cu0 and strong Lewis acid, copper and cobalt oxides, on Cu3Co1/CeO2. Redox support CeO2 facilitates dispersion of cobalt while the synergistic effect on dispersion and reduction of cobalt and copper achieves high efficient hydrogenation of biomass oxygenates.

Journal of the Taiwan Institute of Chemical Engineers published new progress about Acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Product Details of C7H12O3.

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

Vazquez-Pateiro, Ivan published the artcileInfluence of Must Clarification Technique on the Volatile Composition of Albariño and Treixadura Wines, SDS of cas: 5405-41-4, the main research area is volatile composition albarino treixadura wine; flotation; must clarification; static settling; volatile compounds; white wine.

Clarification of the musts is carried out to remove particles that cause turbidity, oxidizable polyphenols, and eliminate excess of proteins. However, an excessive clarification of the musts can lead to the reduction of volatile compound concentrations and, as a consequence, modify the sensorial properties of the wines. Therefore, in this study, the influence of two pre-fermentation clarification techniques (static settling and flotation) on the concentrations of volatile compounds has been assessed in Albariño and Treixadura wines. Fermentations were performed at an industrial scale. Volatile compounds have been identified and quantified by gas chromatog. (FID and mass spectrometry detection) and expert panelists assessed the sensory properties of the final wines. The results showed effects of the clarification techniques on the volatile composition of wines from both varieties. Flotation significantly increased the concentrations of benzyl alc. in Treixadura wines, whereas this technique increased the concentration of 1-hexanol, octanoic acid, and furfural in Albariño wines, but without exceeding the corresponding perception thresholds. Panelists tended to score higher the wines coming from flotation, which, together with the shorter application time, makes this technique suitable for clarifying the musts of these two white varieties.

Molecules published new progress about Acidity. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, SDS of cas: 5405-41-4.

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

Zainol, Muzakkir Mohammad published the artcileSynthesis and characterization of porous microspherical ionic liquid carbon cryogel catalyst for ethyl levulinate production, SDS of cas: 539-88-8, the main research area is porous microspherical ionic liquid carbon cryogel catalyst ethyl levulinate.

A new type of carbon cryogel was synthesized from ionic liquid, a green solvent, and furfural mixtures Initially, the gel, formed via sol-gel polycondensation reaction, was freeze-dried, calcined and denoted as CCIL. The effect of furfural to IL (F/IL) ratio, water to IL (W/IL) ratio and sulfuric acid loading on the synthesis of gel was investigated. In addition, the effect of calcination temperature and time were also studied for CCIL preparation The phys. and chem. properties were evaluated with nitrogen physisorption, temperature programmed desorption of ammonia (NH3-TPD), and thermogravimetric analyzer (TGA). Fourier transform IR spectroscopy (FTIR), X-ray diffraction (XRD), field emission SEM with energy dispersive X-ray spectrometry (FESEM-EDX), CHNS anal., total organic carbon (TOC) and NMR spectroscopy (NMR) results were also analyzed. Catalytic testing, conducted to evaluate the performance of CCIL in esterification of levulinic acid with ethanol, inferred large total surface area and high acidity corroborated with good activity. The selected CCIL registered Et levulinate yield of 66.9 mol%. The exptl. results demonstrated the catalyst, derived from new feedstocks, is a potential solid acid catalyst for biomass conversion.

Diamond and Related Materials published new progress about Acidity. 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

Anaya, Juan Alberto published the artcileApplying rosemary extract and caffeic acid to modify the composition of Monastrell wines, Product Details of C6H12O3, the main research area is Monastrell wine polyphenol aromatic compound rosemary extract caffeic acid.

This work studies the effect of applying rosemary extract and caffeic acid on the polyphenolic and aromatic composition of Monastrell wines, as well as the influence of traditional winemaking or incorporating prefermentative maceration. For this purpose, three treatments were carried out in triplicate. In one of them, rosemary extract was applied on the clusters 10 days before harvest, caffeic acid was applied in the same way in another, and, finally, this acid was applied to grape before crushing. Each treatment was run by both traditional vinification and vinification with prefermentative maceration. After making wines, they were monitored for 12 mo after fermentation The application of rosemary extract, and that of caffeic acid but to a lesser extent, increased the color, the concentration of anthocyanins, and the percentage of polymerized anthocyanins, while prefermentation maceration gave rise to wines with a higher concentration of condensed tannins and polyphenols. Applying rosemary extract and caffeic acid in the vineyard also increased the concentration of esters and other compounds that favor wine aromatic quality, which was also enhanced by prefermentative maceration.

European Food Research and Technology published new progress about Acidity. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Product Details of C6H12O3.

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

Escribano-Viana, Rocio published the artcileDo non-Saccharomyces yeasts work equally with three different red grape varieties, Product Details of C6H12O3, the main research area is Lachancea Torulaspora Tempranillo Grenache wine Metschnikowia malolactic fermentation inoculation.

The present study aimed to investigate the oenol. changes induced by non-Saccharomyces yeasts in three red grape varieties from the Rioja Qualified Designation of Origin. Pilot plants fermentation of three different varieties, were conducted following early inoculations with Metschnikowia pulcherrima and with mixed inoculum of Lachancea thermotolerans-Torulaspora delbrueckii from La Rioja and compared to a wine inoculated with Saccharomyces cerevisiae. The microbiol. and physicochem. characteristics of vinifications were analyzed. Results showed that most of the variations due to inoculation strategies were observed in Tempranillo just after the alc. fermentation, probably because of the better adaptation of the inocula to the must’s oenol. properties. Finally, after the malolactic fermentation the inoculation with the mix of Lachancea thermotolerans and Torulaspora delbrueckii caused more changes in Tempranillo and Grenache wines while the early inoculation with Metschnikowia pulcherrima had more effects on Grenache wines. Therefore, the study was aimed to identify the fermentation effects of each inoculation strategy by using different non-Saccharomyces yeasts and different grape varieties.

Fermentation published new progress about Acidity. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Product Details of C6H12O3.

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

Corona, Onofrio published the artcileInfluence of pre-fermentative addition of aqueous solution tannins extracted from oak wood (Quercus petraea) on the composition of Grillo wines, Related Products of esters-buliding-blocks, the main research area is Grillo wine Quercus petraea tannins extract prefermentative addition.

In this research, the chem. characterization of fixed and volatile compounds of two different tannins in aqueous solution (Pratiko L-Harvest and L-Fruit) extracted from oak wood, has been studied. The influence of the above tannins, at different concentrations, on the alc. fermentation kinetics and on the composition and sensorial characteristics of a white wine were then evaluated. The wines added tannins in aqueous solution compared to control wines showed significant differences in fixed compounds (colloids, polyphenols and ellagitannins) and volatile compounds (phenolic aldehydes, volatile phenols, furanic and piranic compounds). The differences of aqueous solution tannins extracted from oak wood were partly due to the drying/maturing and roasting methods used in barrel production Alc. fermentation was partially facilitated by the addition of tannins in aqueous solution The wines obtained showed a higher content of Et esters of medium-chain fatty acids (from 22 to 31%) and, in some cases, higher acetate alcs. (from 15 to 28%), relevant to the olfactory sensations provided to the wines. The tannins added to the must before fermentation also made it possible to obtain an addnl. supply of polyphenols (from 25 to 85%) able to induce more complex sensory profiles in the wines, with increased persistent taste notes.

European Food Research and Technology published new progress about Acidity. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Related Products of esters-buliding-blocks.

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