(PDF) Bridging the gap between cellulose chemistry and ,

(PDF) Bridging the gap between cellulose chemistry and ,

IR spectra of cellulose before (a) and after ball-milling (b) +7 Schematic illustration of the proposed mechanism for formation of sulfonated silica/carbon nanocomposites (TEOS .

Get More
Hydrolysis of Cellulose Selectively into Glucose Over ,

Hydrolysis of Cellulose Selectively into Glucose Over ,

Apr 10, 2009· The balls were loaded with 20 g of cellulose (Fluka, Avicel ® PH-101, microcrystalline) into a ZrO 2 bottle (2000 mL) A typical catalytic reaction procedure: cellulose (45 mg) treated by ball-milling for 48 h shown in Fig 1, catalyst (50 mg), water (50 mL) were introduced in a steal autoclave lined by Teflon (25 mL) under air The autoclave .

Get More
A co-production of sugars, lignosulfonates, cellulose, and ,

A co-production of sugars, lignosulfonates, cellulose, and ,

Ball-milled woods with two particle sizes were prepared by ball milling for 80min or 120min (BMW80, BMW120) and then enzymatically hydrolyzed 783% cellulose conversion of BMW120 was achieved, which was three times as high as the conversion of BMW80 The hydrolyzed residues (HRs) were neutrally sulfonated cooking 5772g/L and 8816g/L .

Get More
Fast catalytic conversion of recalcitrant cellulose into ,

Fast catalytic conversion of recalcitrant cellulose into ,

Sulfonated hyperbranched polymers were recently reported to efficiently mimic cellulase activity, produ-cing large quantities of glucose from cellulose The polymer structure allows tuning of the acid properties , Intense ball-milling of cellulose with a solid cata-lyst, eg, together with acidic carbons, is required to improve

Get More
Study on cellulose (96% crystalline) hydrolysis ,

Study on cellulose (96% crystalline) hydrolysis ,

Aug 06, 2019· For instance, Onda et al reported that they have achieved 405% of glucose yield and 425% cellulose conversion using carbon-based catalyst after pretreating the cellulose through ball milling Similarly, higher glucose yield was reported in the hydrolysis of ionic liquid pretreated cellulose using carbon-based catalyst [ 7 , 16 ]

Get More
Bridging the gap between cellulose chemistry and ,

Bridging the gap between cellulose chemistry and ,

CH2 scissoring motion in the cellulose I crystal The ball-milling allows the regular arrangement of the CH2OH group on C6 to relax into a more random one, resulting in a broader band at 1430 cm-1 Figure 4: IR spectra of cellulose before (a) and after ball-milling (b) 12 Hydrolysis of cellulose to glucose

Get More
Supporting Information recoverable sulfonated ,

Supporting Information recoverable sulfonated ,

Arrhenius plot of ethanolysis of cellulose to ethyl levulinate on 5-Cl-SHPAO Table 2S Properties of selected pure cellulose powders Properties Type cellulose Pretreatment Particle size ( m) Crystallinity (CrI%) DP (# units) Avicel PH-101 Ball-milling 57

Get More
Optimization of cellulose hydrolysis in the presence of ,

Optimization of cellulose hydrolysis in the presence of ,

Apr 22, 2020· 高达10%返现· The milling process was conducted by measuring 314 g of cellulose powder and by introducing it into a 25 ml grinding jar that was equipped with a push-fit lid made of zirconium oxide and protective stainless steel jacket Moreover, two 10 g of balls made of zirconium oxide (12 mm of diameter) were used for the milling process

Get More
Catalytic ethanolysis of microcrystalline cellulose over a ,

Catalytic ethanolysis of microcrystalline cellulose over a ,

Sep 15, 2020· Pang et al employed sulfonated carbon at elevated temperatures for the hydrolysis of cellulose pretreated by ball-milling for 48 h The sulfonation of the carbon materials was carried out by boiling the carbon materials in concentrated sulfuric acid (15 mL per gram of carbon) at 150–300 °C for 24 h under N 2 atmosphere

Get More
A co-production of sugars, lignosulfonates, cellulose, and ,

A co-production of sugars, lignosulfonates, cellulose, and ,

Aug 01, 2017· This new biorefinery is designed by using ball milling pretreatment, neutral sulfite delignification, and cellulose upgradation, generating four target products (sugars, lignosulfonates, cellulose, and cellulose nanocrystals) The product yields are balanced to provide an intuitive view of the integrated profitability of multi-products

Get More
Hydrolysis of cellulose into glucose over carbons ,

Hydrolysis of cellulose into glucose over carbons ,

pretreated by ball-milling at room temperature for 48 h, with ZrO2 balls and a speed of 500 rpm (PM 100, RETSCH ball mills, 50 ml) The hydrolysis of cellulose was carried out in a stainless-steel autoclave with autogenous pressure For each reaction, 027 ,

Get More
Hydrolysis of cellulose with one-pot synthesized ,

Hydrolysis of cellulose with one-pot synthesized ,

For instance, Onda et al reported that they have achieved 405% of glucose yield and 425% cellulose conversion using carbon-based catalyst after ,

Get More
Mechanochemistry-assisted hydrolysis of softwood over ,

Mechanochemistry-assisted hydrolysis of softwood over ,

Oct 18, 2019· In contrast, concerted ball-milling (CBM) of cellulose with the sulfonated carbon promotes a heterogeneously catalyzed hydrolysis to soluble oligosaccharid

Get More
(PDF) Mechanocatalytic Depolymerization of Cellulose With ,

(PDF) Mechanocatalytic Depolymerization of Cellulose With ,

Mar 22, 2018· cellulose with Aquivion PW 98 (mass of cellulose, 1 g; catalyst, 05 g; milling speed, 400 rpm; zirconium oxide balls diameter, d MB, 10 mm; ball-milling time, 24 h) water coming from the .

Get More
A novel magnetic carbon-based solid acid catalyst suitable ,

A novel magnetic carbon-based solid acid catalyst suitable ,

Jan 02, 2021· Ball milling with 25 g of cellulose was carried out using ZrO 2 balls (mass 75 g, diameter 18 cm) Characterization of catalysts The synthesized sucralose-derived magnetic carbon-based catalyst’s size and morphology were characterized by scanning electron microscopy (SEM) analysis using a JSM-5600 LV microscope (ZEISS Merlin, Germany)

Get More
Mechanochemistry-assisted hydrolysis of softwood over ,

Mechanochemistry-assisted hydrolysis of softwood over ,

Oct 18, 2019· Ball-milling induced amorphization promotes a substantially higher substrate reactivity, because homogeneous hydrolysis occurs preferentially from less ordered structural domains in cellulose In contrast, concerted ball-milling (CBM) of cellulose with the sulfonated carbon promotes a heterogeneously catalyzed hydrolysis to soluble .

Get More
Frontiers | Mechanocatalytic Depolymerization of Cellulose ,

Frontiers | Mechanocatalytic Depolymerization of Cellulose ,

Amorphous cellulose-1 (pretreated by phosphoric acid) was more likely to be degraded than amorphous cellulose-2 (pretreated by ball-milling) because of the lower crystallinity, and the TRS and glucose yields reached 783% and 697%, respectively, after an 8-h reaction (Entry 9)

Get More
Selective Hydrolysis of Cellulose and Polysaccharides into ,

Selective Hydrolysis of Cellulose and Polysaccharides into ,

Ball-milling treatment of microcrystalline cellulose resulted in an insoluble material with β-1,4-glycosidic bonds but containing large noncrystalline regions as confirmed by XRD and CP/MAS 13C NMR21) The re-action rate of cellulose hydrolysis using dilute sulfuric acid at 448 K increased with decreasing cellulose crys-tallinity21)

Get More
Zr/P/O catalyst for the direct acid chemo , - ScienceDirect

Zr/P/O catalyst for the direct acid chemo , - ScienceDirect

Feb 01, 2014· Amberlyst 15 (supplier Sigma–Aldrich) was also used as a reference sulfonated system High energy ball milling of cellulose was carried out using a SPEX CertiPrep 8000-series Mixer/Mill, using vials with tungsten carbide-lined body and two 7/16 in tungsten carbide spher 22 Reactivity experiments

Get More
Ball milling: a green technology for the preparation and ,

Ball milling: a green technology for the preparation and ,

Ball milling is a simple, fast, cost-effective green technology with enormous potential One of the most interesting applications of this technology in the field of cellulose is the preparation and the chemical modification of cellulose nanocrystals and nanofibers Although a number of studies have been reported

Get More
Roles of Ball Milling Pretreatment and Titanyl Sulfate in ,

Roles of Ball Milling Pretreatment and Titanyl Sulfate in ,

Production of 5-hydroxymethylfurfural (HMF) from cellulose has been expected for a long time, but most catalytic systems generally give low yield and selectivity due to the difficulty of balancing cellulose deconstruction with the uncontrollable degradation of the target product under harsh conditions Here we show that the ball milling pretreatment could markedly facilitate the ,

Get More
(PDF) Sulfonated silica/carbon nanocomposites as novel ,

(PDF) Sulfonated silica/carbon nanocomposites as novel ,

Hydrolytic conversion of cellulose over heterogeneous acids Reaction conditions: cellulose pretreated by ball-milling 005 g, catalyst 005 g, water 5 mL, reaction time 24 ,

Get More
A co-production of sugars, lignosulfonates, cellulose, and ,

A co-production of sugars, lignosulfonates, cellulose, and ,

etary ball mill (Across International Co, USA) was used with a 5-liter capacity steel container and steel balls of ø5 mm, ø10 mm, and ø20 mm for 80 min and 120 min milling time, respectively One jar was loaded with a ball-to-material ratio (BMR) of 296:1 The rotation speed of the disc was maintained at 270 rpm with one rotation direction .

Get More
Ball milling for cellulose depolymerization and ,

Ball milling for cellulose depolymerization and ,

Jun 01, 2019· Ball-milled cellulose yielded considerable ML at mild reaction temperature • Al 2 (SO 4) 3 as catalyst was used for cellulose alcoholysis under microwave conditions • Ball milling pretreatment reduces the reaction activation energy • Cellulose structure changes by ball milling pretreatment facilitated the alcoholysis Abstract

Get More
Hydrolysis of Cellulose Selectively into Glucose Over ,

Hydrolysis of Cellulose Selectively into Glucose Over ,

Apr 10, 2009· 高达10%返现· A typical catalytic reaction procedure: cellulose (45 mg) treated by ball-milling for 48 h shown in Fig 1, catalyst (50 mg), water (50 mL) were introduced in a steal autoclave lined by Teflon (25 mL) under air The autoclave was heated at 423 K for 24 h with agitation (22 rpm)

Get More
Introduction - Sustainable Chemistry - Dr , - Dr Darrin Lew

Introduction - Sustainable Chemistry - Dr , - Dr Darrin Lew

Feb 07, 2022· Table 1: Catalytic conversion of cellulose over sulfonated silica /carbonnanocomposit Reaction conditions: cellulose pretreated by ball-milling 005 g, catalyst 005 g, water 5 mL, reaction time 24 h, temperature 423 K [6]

Get More
A co-production of sugars, lignosulfonates, cellulose, and ,

A co-production of sugars, lignosulfonates, cellulose, and ,

Ball-milled woods with two particle sizes were prepared by ball milling for 80min or 120min (BMW80, BMW120) and then enzymatically hydrolyzed 783% cellulose conversion of BMW120 was achieved, which was three times as high as the conversion of BMW80

Get More
Nettle leaves-based sulfonated graphene oxide for ,

Nettle leaves-based sulfonated graphene oxide for ,

Jan 15, 2021· Nettle (Urtica dioica L) was used for newly synthesized sulfonated graphene oxideStacked graphene layers from iron-catalyzed graphitization of nettle leav • Surface area 3549 m 2 g −1 and total acid sites density 547 mmol g −1 were achieved New catalyst was investigated in hydrolysis of untreated microcrystalline cellulose

Get More
Sulfonated cellulose nanofibrils obtained from wood pulp ,

Sulfonated cellulose nanofibrils obtained from wood pulp ,

Jan 22, 2013· The consecutive pre-treatment of cellulose with periodate and bisulfite was used as a new potential method to promote nanofibrillation of hardwood pulp and to obtain nanofibrils with sulfonated functionality Nanofibrils having typical widths of 10–60 nm were obtained from sulfonated celluloses having low anionic charge densities (018–051 mmol/g) by direct high ,

Get More
(PDF) Sulfonated silica/carbon nanocomposites as novel ,

(PDF) Sulfonated silica/carbon nanocomposites as novel ,

ball-mill pretrea ted cellulose o ver sulf ona ted activ ated carbon ca talysts, and they achiev ed a nota ble glucose yield of 41% Sugan uma et al inv estigated the ca talytic perf or mance of.

Get More