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Hydrogenation of Fructose on Ru/C Catalysts | Request PDF

Hydrogenation of Fructose on Ru/C Catalysts | Request PDF

The effects of the reaction time (10–120min), reaction temperature (283–333K), and catalyst to d-fructose ratio (1–6%) on the yield of d-mannitol were studied. 45% d-mannitol yield, 41% d .

Hydrogenation of allyl alcohols catalyzed by aqueous .

Hydrogenation of allyl alcohols catalyzed by aqueous .

In the present study, we investigated the hydrogenation of allyl alcohols catalyzed by Pt and Pd NPs, stabilized by lignins and prepared according to our previously published method. 42,43 To reduce and stabilize metal ions we used different types of lignin, an important and widely available waste-product of paper and sugar cane industries .

(PDF) Sugar Alcohols: Chemistry, Production, Health .

(PDF) Sugar Alcohols: Chemistry, Production, Health .

The sugar alcohols commonly found in foods are sorbitol, mannitol, xylitol, erythritol, isomalt, and hydrogenated starch hydrolysates. Sugar alcohols come from plant products such as fruits and .

Hydrogen Gas-Mediated Deoxydehydration/Hydrogenation .

Hydrogen Gas-Mediated Deoxydehydration/Hydrogenation .

DODH/hydrogenation sequence (entry 8). Spurred on by these promising results, conditions that promoted the ring-opening reaction of 3-Et were explored in order toimprove the yield of the desired diethyladipate. During the synthesis of various potential substrates, we observed choice ofesterifying alcohol had asignificantimpact onthe equilibrium

Hydrolytic hydrogenation of chitin to amino sugar alcohol .

Hydrolytic hydrogenation of chitin to amino sugar alcohol .

Chitin is the second most abundant biomass and characteristically contains nitrogen atoms in its monomer units. These favourable features promote chitin to be a potential resource for renewable organonitrogen compounds. 2-Acetamido-2-deoxysorbitol (ADS) is an attractive target in the derivatives of chitin, but the conversion of chitin to ADS has not been reported so far.

Asymmetric Hydrogenation of Allylic Alcohols via Dynamic .

Asymmetric Hydrogenation of Allylic Alcohols via Dynamic .

Jun 14, 2018 · However, the complex mixture obtained in the hydrogenation of some acid sensitive allylic alcohols made it difficult to interpret the results. The project was suspended for a short time but work began again in late 2011 with the key breakthrough in the summer of 2012 when we repeated the experiment using the optically pure (2R)-1 and (2S)-1 as .

CO 2 hydrogenation to high-value products via .

CO 2 hydrogenation to high-value products via .

Dec 13, 2019 · Methanol (CH 3 OH) reaction based CO 2 hydrogenation can be realized by coupling two sequential reactions over a bifunctional catalyst. First, .

Production of C5/C6 Sugar Alcohols by Hydrolytic .

Production of C5/C6 Sugar Alcohols by Hydrolytic .

Producing chemicals from lignocellulosic biomass is important in view of the huge availability of biomass and positive environmental significance by reducing carbon emission due to fast carbon cycle during biomass growth and applications. Here, we prepared zirconium based solid acids for hydrolytic hydrogenation of raw lignocelluloses to coproduce C5/C6 sugar alcohols (the important platform .

Sugar Hydrogenation Over Supported Ru/C—Kinetics and .

Sugar Hydrogenation Over Supported Ru/C—Kinetics and .

May 25, 2010 · The hydrogenation kinetics of some natural sugars to corresponding sugar alcohols in aqueous solutions was investigated on Ru/C catalysts in a pressurized slurry reactor. The kinetic data were well described by a Langmuir-Hinshelwood model assuming that the hydrogenation step on the catalyst surface is rate determining.

Method for hydrogenation of acetone to isopropanol

Method for hydrogenation of acetone to isopropanol

Reactor of the first stage can be circulation reaction, and at the second stage - tube reactor. For hydrogenation reaction acetone containing 1.0 wt.-% of water, not less, is used. Invention provides carrying out the process with high selectivity to yield isopropanol containing impurities in the concentration less 300 mole fr., preferably, less .

ORGANIC CHEMISTRY Anti-Markovnikovalcoholsvia epoxide .

ORGANIC CHEMISTRY Anti-Markovnikovalcoholsvia epoxide .

Mn powder, have made the reaction catalytic in Ti. The Norton group has shown that CpCr(CO) 3H 3, which has a bond dissociation energy of only 62 kcal mol−1, can transfer H† to organic radi-cals (36–40). Compound3 should thus react to form Ti(IV) alkoxides 5 by H† transfer to 2. The regeneration of 3, by the hydrogenation of CpCr(CO)

Sugar hydrogenation in continuous reactors: From catalyst .

Sugar hydrogenation in continuous reactors: From catalyst .

The simulations suggested the use of small catalyst particles or structured catalysts in continuous hydrogenation of the sugars to sugar alcohols. Continuous hydrogenation of l -arabinose was carried out in a laboratory-scale fixed bed reactor with ruthenium catalysts on three different supports (active carbon clothes, carbon nanotubes on .

Hydrolytic hydrogenation of chitin to amino sugar alcohol .

Hydrolytic hydrogenation of chitin to amino sugar alcohol .

Chitin is the second most abundant biomass and characteristically contains nitrogen atoms in its monomer units. These favourable features promote chitin to be a potential resource for renewable organonitrogen compounds. 2-Acetamido-2-deoxysorbitol (ADS) is an attractive target in the derivatives of chitin, but the conversion of chitin to ADS has not been reported so far.

Sugar alcohol - Wikipedia

Sugar alcohol - Wikipedia

Sugar alcohols (also called polyhydric alcohols, polyalcohols, alditols or glycitols) are organic compounds, typically derived from sugars, containing one hydroxyl group (–OH) attached to each carbon atom. They are white, water-soluble solids that can occur naturally or be produced industrially by hydrogenation of sugars. Since they contain multiple –OH groups, they are classified as polyols.

Transfer hydrogenation of cellulose to sugar alcohols over .

Transfer hydrogenation of cellulose to sugar alcohols over .

the weight difference of the solid after the reaction. Scheme 1 Transfer hydrogenation of cellulose to sugar alcohols. 55 Accordingly, the selectivity based on the cellulose conversion for the sum of the sugar alcohols was 57%. 1,4-Sorbitan (1.4%), C2-C4 polyols (total 5.3%: ethylene glycol 0.8%,

Hydrogenation of lactose for the production of lactitol .

Hydrogenation of lactose for the production of lactitol .

Dec 10, 2018 · Lactitol is the primary sugar alcohol derived from lactose through a set of chemical reactions known as catalytic hydrogenation. Reaction products are strongly dependent on the reaction conditions and catalyst type. The purpose of this review is to examine the production of lactitol through hydrogenation of lactose. Technological aspects of .

Sugar hydrogenation in continuous reactors : from catalyst .

Sugar hydrogenation in continuous reactors : from catalyst .

The simulations suggested the use of small catalyst particles or structured catalysts in continuous hydrogenation of the sugars to sugar alcohols. Continuous hydrogenation of l-arabinose was carried out in a laboratory-scale fixed bed reactor with ruthenium catalysts on three different supports (active carbon clothes, carbon nanotubes on sponge .

Synthesis of sugar alcohols by hydrolytic hydrogenation of .

Synthesis of sugar alcohols by hydrolytic hydrogenation of .

Cellulose is converted into sorbitol and related sugar compounds over water-tolerant and durable carbon-supported Pt catalysts under aqueous hydrogenation conditions. Pre-treatment of cellulose with ball-milling effectively reduces the crystallinity and particle .

What is Hydrogenation?

What is Hydrogenation?

Hydrogenation is a chemical reaction between molecular hydrogen and other compounds and elements. Hydrogenation is used in many applications such as the food industry, petrochemical industry and the pharmaceutical manufacturing industry. . the dextrose is then hydrogenated to create sorbitol or sugar alcohol. In the Petroleum Industry .

Hydrogenation of Glucose to Sorbitol over Nickel and .

Hydrogenation of Glucose to Sorbitol over Nickel and .

The hydrolytic hydrogenation of these sugar polymers produces sugar alcohols, which are used as low-calorie and low-cariogenic sweeteners and sugar substitutes for diabetics, as humectants in .

Platinum-Catalyzed Aqueous-Phase Hydrogenation of .

Platinum-Catalyzed Aqueous-Phase Hydrogenation of .

hydrothermal reaction conditions than Ni or Ru, as well as exhibit excellent performance in hydrogenation and hydro-isomerization reactions.25−27 Gallezot et al. demonstrated continuous glucose hydrogenation to sorbitol in high yields over Ru/C,17 but employed high H 2 pressures (80 bar) and a 40 wt% glucose solution more concentrated than .

Converting sugars to sugar alcohols by aqueous phase .

Converting sugars to sugar alcohols by aqueous phase .

@article{osti_921798, title = {Converting sugars to sugar alcohols by aqueous phase catalytic hydrogenation}, author = {Elliott, Douglas C and Werpy, Todd A and Wang, Yong and Frye, Jr., John G.}, abstractNote = {The present invention provides a method of converting sugars to their corresponding sugar alcohols by catalytic hydrogenation in the aqueous phase.

Hydrolytic hydrogenation of chitin to amino sugar alcohol .

Hydrolytic hydrogenation of chitin to amino sugar alcohol .

Specifically, in the hydrogenation step, an acid causes various side-reactions of amide and hemiacetal groups especially in the presence of a Ru catalyst, whereas even a small amount of base drastically accelerates the retro-aldol reaction to form erythritol and N-acetylethanolamine. Therefore, a one-pot but two-step reaction is necessary to .

Sugar Alcohols: Good or Bad?

Sugar Alcohols: Good or Bad?

Sep 19, 2018 · Sugar alcohols have a number of other potential benefits worth highlighting: Prebiotic: Sugar alcohols may feed the friendly bacteria in your gut, having a prebiotic effect like dietary fiber (13 .

Direct Hydrogenation of Amides to Alcohols and Amines .

Direct Hydrogenation of Amides to Alcohols and Amines .

The selective, direct hydrogenation of amides to the corresponding alcohols and amines with cleavage of the C−N bond was discovered. The expected products of C−O cleavage are not formed (except as traces in the case of anilides). The reaction proceeds under mild pressure and neutral, homogeneous conditions using a dearomatized, bipyridyl-based PNN Ru(II) pincer complex as a catalyst.

Catalytic Hydrogenation of Alkenes - Chemistry LibreTexts

Catalytic Hydrogenation of Alkenes - Chemistry LibreTexts

Introduction. An example of an alkene addition reaction is a process called hydrogenation.In a hydrogenation reaction, two hydrogen atoms are added across the double bond of an alkene, resulting in a saturated alkane.Hydrogenation of a double bond is a thermodynamically favorable reaction because it forms a more stable (lower energy) product.

Transfer hydrogenation vs nucleophilic addition: aryne .

Transfer hydrogenation vs nucleophilic addition: aryne .

Additionally, Hoye reported that at low alcohol concentration the reaction can take an alternate path, an Oppenauer- or Cannizzaro-like transfer hydrogenation reaction that oxidizes the alcohol into a carbonyl compound and reduces the aryne into an arene (Scheme 1, left).This novel mode of reactivity is first-order with respect to the alcohol and is calculated to proceed via a concerted .

Hydrogenated starch hydrolysates - Wikipedia

Hydrogenated starch hydrolysates - Wikipedia

Hydrogenated starch hydrolysates (HSHs) are mixtures of several sugar alcohols (a type of sugar substitute). Hydrogenated starch hydrolysates were developed by the Swedish company Lyckeby Starch in the 1960s. The HSH family of polyols is an approved food ingredient in Canada, Japan, and Australia.

Catalytic Hydrogenation of Macroalgae-Derived Alginic Acid .

Catalytic Hydrogenation of Macroalgae-Derived Alginic Acid .

Dec 22, 2017 · The highest yield of C6 sugar alcohols is 61 % (sorbitol: 29 %; mannitol: 28 %; galactitol: 4 %). The low sorbitol/mannitol ratio is in contrast to that from cellulose hydrogenation, owing to the composition of alginic acid and isomerization between sugar alcohols under the catalytic system.

Hydrogenation of lactose for the production of lactitol .

Hydrogenation of lactose for the production of lactitol .

Dec 10, 2018 · Lactitol is the primary sugar alcohol derived from lactose through a set of chemical reactions known as catalytic hydrogenation. Reaction products are strongly dependent on the reaction conditions and catalyst type. The purpose of this review is to examine the production of lactitol through hydrogenation of lactose. Technological aspects of .