Promotion effects of Pd on tungsten carbide catalysts: physiochemical properties and cellulose conversion performance

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87756-87766 ◽  
Author(s):  
Glauco F. Leal ◽  
Silvia F. Moya ◽  
Debora M. Meira ◽  
Dean H. Barrett ◽  
Erico Teixeira-Neto ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Tungsten Carbide ◽  
Value Added ◽  
Aldol Reactions ◽  
One Pot ◽  
Cellulose Conversion ◽  
Physiochemical Properties ◽  
Conversion Performance

A multi-functional catalyst, which is able to perform both retro-aldol reactions followed by hydrogenation, is required to convert cellulose into value-added chemicals such as ethylene glycol (EG) in a one-pot reaction.

scholarly journals Self-propagating High-temperature Synthesis of Materials Based on Tungsten Carbide for One-Pot Hydrolysis-Hydrogenolysis of Cellulose Into Ethylene Glycol and 1,2-Propylene Glycol

2019 ◽  
pp. 269-281
Author(s):  
Nikolay V. Gromov ◽  
Тatiana B. Medvedeva ◽  
Ivan А. Lukoyanov ◽  
Alekasandr А. Zhdanok ◽  
Vladimir А. Poluboyarov ◽  
...  
Keyword(s):  
High Temperature ◽  
Ethylene Glycol ◽  
Tungsten Carbide ◽  
Propylene Glycol ◽  
Reaction Rate ◽  
Total Yield ◽  
Temperature Synthesis ◽  
One Pot ◽  
Catalytic Systems ◽  
High Temperature Synthesis

Catalytic systems based on tungsten carbide (WnC) containing mainly W2C were obtained by the method of self-propagating high-temperature synthesis from a mechanochemically activated mixture of tungsten oxide, metallic magnesium, carbon black and CaCO3. The phase composition of the formed materials was shown to depend on the amount of CaCO3. The catalytic properties of the materials were tested in the hydrolysis-hydrogenation of cellulose to ethylene glycol (EG) and 1,2-propylene glycol (PG). It was established that in the presence of WnC the main products of the reaction were EG and PG with a ratio of PG/EG – 1.5-1.8. The deposition of nickel nanoparticles on the WnC surface increased the reaction rate and product yields. The maximum total yield of diols was 47.1 mol. %.

Enhanced one-pot selective conversion of cellulose to ethylene glycol over NaZSM-5 supported metal catalysts

2021 ◽  
Author(s):  
Sreejith Sreekantan ◽  
Arun Arunima Kirali ◽  
Banu Marimuthu
Keyword(s):  
Ethylene Glycol ◽  
Sol Gel ◽  
Metal Catalysts ◽  
Supported Metal Catalysts ◽  
Reaction Conditions ◽  
One Pot ◽  
Cellulose Conversion ◽  
Moderate Reaction ◽  
Gel Method ◽  
Sol Gel Method

The mesopores/micropores NaZSM-5 was synthesised by sol–gel method. The 5%Al–8%Ni–25%W/NaZSM-5 catalyst exhibited the highest cellulose conversion of 100% with EG yield as high as 89% (C mol%) at moderate reaction conditions which is highly applicable in polymer Industry.

scholarly journals Green solvent-enabled biomass conversion for renewable chemicals and lignin upgrading

2018 ◽  
Author(s):  
◽  
Zhu Chen
Keyword(s):  
Ethylene Glycol ◽  
Lignocellulosic Biomass ◽  
Choline Chloride ◽  
Value Added ◽  
Solvent System ◽  
Solid Loading ◽  
One Pot ◽  
High Solid ◽  
Renewable Chemicals ◽  
High Solid Loading

Lignocellulosic biomass, which is mainly composed of cellulose, hemicellulose, and lignin, is a promising feedstock for producing renewable chemicals and fuels. To make lignocellulosic biomass-based refinery (biorefinery) competitive with petroleum refinery, maximizing the utilization of the three major components is critical. This requires the efficient fractionation of lignocellulose into different streams amenable to further upgrading. To this end, this work investigated the use of quaternary ammonium salt-based green solvents for lignocellulose fractionation and upgrading into renewable chemicals. First, a platform solvent system based on choline chloride and ethylene glycol was developed for switchgrass fractionation. Tailor-made lignin can be produced by using this platform solvent system, while the delignification and cellulose digestibility were not compromised. Highly concentrated sugar hydrolysate from pulp (cellulose) streams can be obtained via high solid loading enzymatic hydrolysis. The hemicellulose streams can be facilely upgraded into furfural via a novel biphasic system-acetone and aqueous choline chloride: ethylene glycol (ChCl:EG). Secondly, switchgrass can be fractionated effectively at high solid loading using either aqueous ChCl:EG or a series of ternary deep eutectic solvents. The cellulose stream can be converted into highly concentrated hydrolysate for high titer platform chemical production via fermentation. The hemicellulose and lignin streams can also be converted into other value-added products via other upgrading pathways. Thirdly, aqueous ChCl can also be a good solvent for switchgrass fractionation at mild conditions. The resultant lignin presented a very similar structure to native lignin, and thus, a great potential to be valorized into different products. The hemicellulose and cellulose streams can also be converted into valuable chemicals via biological and chemical routes. Lastly, a one-pot process capable of directly converting the untreated lignocellulosic biomass into furfural, digestible cellulose pulp and high purity lignin was developed. Furfural can be produced with high yield, while cellulose and lignin with appealing properties can be obtained via a one-pot process.

A structure–activity relationship study using DFT analysis of Bronsted–Lewis acidic ionic liquids and synergistic effect of dual acidity in one-pot conversion of glucose to value-added chemicals

2018 ◽  
Vol 42 (2) ◽  
pp. 1423-1430 ◽  
Author(s):  
Firdaus Parveen ◽  
Tanmoy Patra ◽  
Sreedevi Upadhyayula
Keyword(s):  
Ionic Liquids ◽  
Synergistic Effect ◽  
Formic Acid ◽  
Levulinic Acid ◽  
Value Added ◽  
One Pot ◽  
Structure Activity ◽  
Acidic Ionic Liquids ◽  
Commercially Important ◽  
Relationship Study

The catalytic conversion of biomass-derived carbohydrates to value-added chemicals, such as 5-hydroxymethylfurfural, levulinic acid, and formic acid, is a commercially important reaction and requires the use of both Lewis and Bronsted acids.

Solvent-mediated crystalline phases of NixSy anchored on rGO sheets as electrocatalysts for hydrogen evolution application

2019 ◽  
Vol 12 (01) ◽  
pp. 1850089
Author(s):  
Hou Lin Yu ◽  
Wenliang Shi ◽  
Shuaishuai Li ◽  
Junma Zhang ◽  
Xiaobo Zhang ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Hydrogen Evolution ◽  
Hydrothermal Process ◽  
Volume Ratio ◽  
Decisive Role ◽  
Catalytic Performance ◽  
Deionized Water ◽  
Alkaline Media ◽  
One Pot ◽  
Alkaline Environments

A facile, one-pot solvent-mediated hydrothermal process was adopted to prepare nickel sulfide nanoparticles decorated on reduced graphene oxide (NixSy/rGO) as electrocatalysts for hydrogen evolution reaction (HER). The designed solvent (ethylene glycol and deionized water) played a decisive role in controlling both crystalline phase and morphology of NixSy/rGO composites, leading to pure [Formula: see text]-NiS nanoparticles uniformly distributed on rGO sheets under suitable volume ratio of ethylene glycol and deionized water (2:1). The optimized [Formula: see text]-NiS/rGO showed prominent HER catalytic performance with a rather small Tafel slope of 93[Formula: see text]mV/decade and prominent current density of 10[Formula: see text]mA/cm2 at the overpotential of 177[Formula: see text]mV in alkaline environments when compared to pristine [Formula: see text]-NiS and NiS2/rGO catalysts. The excellent catalytic performance and long-term durability even after 8000 cycles confirmed the potential of [Formula: see text]-NiS/rGO composites as efficient electrocatalysts for HER in the alkaline media.

An Efficient One-Pot Four-Component Hantzsch Reaction to Prepare Hydroquinolines Catalyzed by a Poly(ethylene glycol) Bridged Dicationic Basic Ionic Liquid under Solvent-Free Conditions

2013 ◽  
Vol 781-784 ◽  
pp. 247-252
Author(s):  
Jun Luo ◽  
Tan Tan Xing ◽  
Ying Lei Wang ◽  
Jian Feng Ju
Keyword(s):  
Ionic Liquid ◽  
Ethylene Glycol ◽  
Solvent Free ◽  
Hantzsch Reaction ◽  
Poly Ethylene Glycol ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Basic Ionic Liquid ◽  
Activity Loss ◽  
Poly Ethylene

A piperidine-functionalized poly (ethylene glycol) bridged dicationic ionic liquid PEG800-DPIL(Cl) was synthesized and applied to catalyze the four-component Hantzsch reaction under solvent-free conditions and afford hydroquinolines with high to excellent yields. PEG800-DPIL(Cl) could be recovered by simple workup and recycled for at least eight times without obvious activity loss.

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