Abstract
Napier grass and Corn Stover samples were collected as waste materials for sugar production. The samples were pretreated and hydrolyzed using hydrogen peroxide and Trichoderma ressei cellulase respectively. Chemical kinetics of the delignification process shows that the reduction reactions of lignin during pretreatment are dependent on the nature of raw material, temperature, concentration of the hydrogen peroxide and their activation energies. The calculated activation energies show that the reactions of lignin in both biomasses are though endothermic, but less energy intensive and more economically viable for Napier grass when compared to corn Stover. Based on the results, in order to obtain higher sugar yield from Napier grass and corn stover under the investigated conditions, both samples should be processed at 105 °C for 96 hours using 0.3 M and 0.1M hydrogen peroxide concentrations respectively.
Highlights
Lignocellulosic biomasses are currently the most preferable sources of reducing sugars
Chemical kinetics of the delignification process shows that the reduction reactions of lignin during pretreatment are dependent on the nature of raw material, temperature, concentration of the hydrogen peroxide and their activation energies
Lignocellulosic biomass is composed of major structural components of Cellulose, hemicellulose, lignin, extractives, ash and moisture
Summary
Lignocellulosic biomasses are currently the most preferable sources of reducing sugars. Hemicellulose is a copolymer of different amounts of several saccharide molecules [7]. It is less chemically and thermally stable compared to cellulose because of its non-crystalline nature [8]. Chemical pretreatments and enzymatic hydrolysis of Napier grass and corn stover were investigated, in order to ascertain the endothermic nature of lignin reactions with hybridhydroxide peroxide mix. This is because, oxidizing agents, such as hydrogen peroxide and ozone have been reported to have high delignification efficiencies [19,20]. Besides the proposal by Sanni et al [21] concerning the reaction between lignin in Napier grass and NaOH, no work has considered the nature of the reactions of hybrid NaOH-H2O2 mix with lignin in biomass
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