Pretreatment and fractionation of lignocellulosic barley straw by mechanocatalysis

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

doi:10.1016/j.cej.2017.06.175

Cited by 37 publications

(23 citation statements)

References 36 publications

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“…The FTIR shows the overlapping spectra of raw and mechanically pretreated barley straw in Figure 4. The decrease in intensity spectrum of pretreated barley in comparison with raw barley straw in the bands at 1060-1645 cm −1 and the broadband at 3000-3820 cm −1 suggests the occurrence of deformation in the chemical structure of pretreated barley straw as a result of applying mechanical degradation of lignocellulose [40]. 3-hydroxyspirost-8-en-11-one, 13.41 min is estriol 16-glucuronide, and 14.82 min is 9-desoxy-9x-chloroingol 3,7,8,12-tetraacetate.…”

Section: Fourier Transform Infrared Spectra (Ftir)mentioning

confidence: 96%

Techno-Economic Analysis of ZnO Nanoparticles Pretreatments for Biogas Production from Barley Straw

et al. 2020

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The aim of this study was to analyze the effect of ZnO nanoparticles (ZnO NPs) on the biogas production from mechanically treated barley straw and to perform a techno-economic analysis based on the costs assessment and on the results of biogas production. The structural changes of mechanically pretreated barley straw were observed using FTIR, XRD, TGA, and SEM. Additionally, both green ZnO NPs prepared from red alga (Antithamnion plumula) extract and chemically prepared ZnO NPs were characterized by FTIR, XRD, SEM, and TEM, surface area, and EDX. The results revealed that the biogas production was slightly improved by 14.9 and 13.2% when the barley straw of 0.4 mm was mechanically pretreated with 10 mg/L of both green and chemical ZnO NPs and produced 390.5 mL biogas/g VS and 385 mL biogas/g VS, respectively. On the other hand, the higher concentrations of ZnO NPs equal to 20 mg/L had an inhibitory effect on biogas production and decreased the biogas yield to 173 mL biogas/g VS, which was less than the half of previous values. It was also clear that the mechanically treated barley straw of 0.4 mm size presented a higher biogas yield of about 340 mL/g VS, in comparison to 279 mL biogas/g VS of untreated biomass. The kinetic study showed that the first order, modified Gompertz and logistic function models had the best fit with the experimental data. The results showed that the nanoparticles (NPs) of the mechanically treated barely straw are a suitable source of biomass for biogas production, and its yields are higher than the untreated barley straw. The results of the cost-benefit analysis showed that the average levelized cost of energy (LCOE), adopting the best treatments (0.4 mm + 10 mg/L ZnO), is 0.21 €/kWh, which is not competitive with the other renewable energy systems in the Egyptian energy market.

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Section: Fourier Transform Infrared Spectra (Ftir)mentioning

confidence: 96%

Techno-Economic Analysis of ZnO Nanoparticles Pretreatments for Biogas Production from Barley Straw

et al. 2020

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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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“…Recently,d epolymerization of cellulose was achievedb ys olvent-free mechanocatalysis. [11] Although cellulose was completely converted to water-soluble oligosaccharides, 70 %o ft hem contained a-1,6 linkagesf ormed by glycosylation of smalls ugar molecules. [12] These reports also highlight the importance of characterization of oligosaccharides to detect undesired functionalization.…”

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confidence: 99%

Soluble Cello‐Oligosaccharides Produced by Carbon‐Catalyzed Hydrolysis of Cellulose

2019

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Cello‐oligosaccharides are biologically important molecules that can elicit a defensive immune response in plants and improve the health of animals. Cellulose, a polymer of glucose linked by β‐1,4‐glycosidic bonds, is an ideal feedstock for synthesis of cello‐oligosaccharides. However, cello‐oligosaccharides rapidly degrade under the conditions used for cellulose hydrolysis. Here, cellulose was hydrolyzed over a carbon catalyst in a semi‐flow reactor to achieve a high yield of cello‐oligosaccharides (72 %). The excellent activity of the oxidized carbon catalyst, the adsorption of cellulose on the catalyst, and the high space velocity of products in the reactor were essential. Moreover, a method for quantification of individual cello‐oligosaccharides was developed, which suggested a reduction in the rate of hydrolysis with a reduction in chain length.

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Pretreatment and fractionation of lignocellulosic barley straw by mechanocatalysis

Cited by 37 publications

References 36 publications

Techno-Economic Analysis of ZnO Nanoparticles Pretreatments for Biogas Production from Barley Straw

Techno-Economic Analysis of ZnO Nanoparticles Pretreatments for Biogas Production from Barley Straw

Kinematic Modeling of Mechanocatalytic Depolymerization of α‐Cellulose and Beechwood

Soluble Cello‐Oligosaccharides Produced by Carbon‐Catalyzed Hydrolysis of Cellulose

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