Solid acid-catalyzed depolymerization of barley straw driven by ball milling

Schneider, Laura; Haverinen, Jasmiina; Jaakkola, Mari; Lassi, Ulla

doi:10.1016/j.biortech.2016.01.095

Cited by 38 publications

(20 citation statements)

References 21 publications

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“…This observation and several others of “mechanical activation” of lignocellulose for enzymatic catalysis brought about the general belief that ball milling was too energy intensive to be considered as a basic operation in biorefineries. However, in more recent years, the combination of dry milling of lignocelluloses impregnated with a strong acid has been demonstrated to dramatically enhance depolymerization rates, reducing the milling duration from 1000 h (uncatalyzed process) to less than 2 h (acid‐catalyzed process) for the full conversion of cellulose into WSPs . This approach is known as mechanocatalytic depolymerization of cellulose.…”

Section: Introductionmentioning

confidence: 99%

Kinematic Modeling of Mechanocatalytic Depolymerization of α‐Cellulose and Beechwood

et al. 2018

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Mechanocatalytic depolymerization of lignocellulose presents a promising method for the solid-state transformation of acidified raw biomass into water-soluble products (WSPs). However, the mechanisms underlining the utilization of mechanical forces in the depolymerization are poorly understood. A kinematic model of the milling process is applied to assess the energy dose transferred to cellulose during its mechanocatalytic depolymerization under varied conditions (rotational speed, milling time, ball size, and substrate loading). The data set is compared to the apparent energy dose calculated from the kinematic model and reveals key features of the mechanocatalytic process. At low energy doses, a rapid rise in the WSP yield associated with the apparent energy dose is observed. However, at a higher energy dose obtained by extended milling duration or high milling speeds, the formation of a substrate cake layer on the mill vials appear to buffer the mechanical forces, preventing full cellulose conversion into WSPs. By contrast, for beechwood, there exists a good linear dependence between the WSP yield and the energy dose provided to the substrate over the entire range of WSP yields. As the formation of a substrate cake in depolymerization of beechwood is less severe than that for the cellulose experiments, the current results verify the hypothesis regarding the negative effect of a substrate layer formed on the mill vials upon the depolymerization process. Overall, the current findings provide valuable insight into relationships between the energy dose and the extent of cellulose depolymerization effected by the mechanocatalytic process.

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Section: Introductionmentioning

confidence: 99%

Kinematic Modeling of Mechanocatalytic Depolymerization of α‐Cellulose and Beechwood

et al. 2018

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“…Cellulose and lignin were ball milled after being mixed with acidic and basic solid catalysts, respectively, and it was found that the mechanocatalysis process could depolymerize the substrates and result in water-soluble fractions, since the β-1,4 glyosidic bond and β-O-4 linkage can be cleaved by a synergistic effect between the solid catalyst and mechanical forces [16−18]. Recent work has mainly focused on the mechanochemical pretreatment of lignocellulosic biomass, which could greatly increase the yield of target products or relieve the severity of reaction conditions followed by a tandem process of hydrothermal acid hydrolysis or enzymatic hydrolysis [19,20].…”

Section: Effect Of Milling Durationmentioning

confidence: 99%

Mechanocatalytic Production of Lactic Acid from Glucose by Ball Milling

Yan

Shen

et al. 2017

Catalysts

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A solvent-free process was developed for the direct production of lactic acid from glucose in a mechanocatalytic process in the presence of Ba(OH) 2 , and a moderate lactic acid yield of 35.6% was obtained. Glucose conversion and lactic acid formation were favorable at higher catalyst/glucose mass ratios. However, at relatively lower catalyst/glucose mass ratios, they were greatly inhibited, and the promotion of fructose formation was observed. The mechanocatalytic process was applicable for various carbohydrates such as C 5 sugars, C 6 sugars, and disaccharides with 20-36% lactic acid yields achieved. This work provides a new pathway for the production of value-added chemicals from biomass resources.

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“…Henceforth, it was stored in an air-tight container and dried at 70°C for 24 h prior to use. The compositional and elemental analysis of the used barley straw was investigated in our earlier publication (Schneider et al, 2016;Schneider et al, 2017). Barley straw contained a mass fraction…”

Section: Raw Materials and Chemicalsmentioning

confidence: 99%

“…The determination of total reducing sugars (TRS) by UV/ VIS spectrometry (Shimadzu UV-1800 spectrometer) was performed as described earlier (Schneider et al, 2016;Miller, 1959) . A (diluted) portion of the hydrolyzed biomass filtrate and a 3.5-dinitrosalicylic acid reagent (1 %) were mixed in a volume ratio of 1:1 and subsequently heated in a boiling water bath for 5 min.…”

Section: Total Reducing Sugar Analysismentioning

confidence: 99%

“…Most commonly used catalysts include inorganic acids such as sulfuric acid and hydrochloric acid (Meine, Rinaldi and Schüth, 2012), but also organic acids such as oxalic acid (Schneider et al, 2016) and maleic acid (Lim and Lee, 2013) were successfully employed in biomass conversion. Moreover, alkaline catalysts such as alkaline peroxide and lime were reported to efficiently convert lignocellulose into valuable products (Saha and Cotta, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Effective saccharification of lignocellulosic barley straw by mechanocatalytical pretreatment using potassium pyrosulfate as a catalyst

Schneider

Haverinen

Jaakkola

et al. 2017

Bioresource Technology

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The catalytic conversion of lignocellulosic biomass is attractive due to the feasible generation of valuable products such as reducing sugars which constitute the basic substrates for chemical and transportation fuel production, as well as the production of renewable hydrogen. This study shows the efficient conversion of lignocellulose, especially hemicellulose, into reducing sugars such as xylose and galactose, by mechanocatalysis using potassium pyrosulfate, KSO, as an effective salt catalyst. Ball milling was performed, introducing a mechanical force which, combined with chemical pretreatment, leads to reducing sugar yields (40%) almost as high as when commonly used sulfuric acid was employed. Kinetic experiments as well as the optimization of the saccharification process are presented.

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Solid acid-catalyzed depolymerization of barley straw driven by ball milling

Cited by 38 publications

References 21 publications

Kinematic Modeling of Mechanocatalytic Depolymerization of α‐Cellulose and Beechwood

Kinematic Modeling of Mechanocatalytic Depolymerization of α‐Cellulose and Beechwood

Mechanocatalytic Production of Lactic Acid from Glucose by Ball Milling

Effective saccharification of lignocellulosic barley straw by mechanocatalytical pretreatment using potassium pyrosulfate as a catalyst

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