1. Supercritical carbon dioxide pretreatment of corn stover and switchgrass for lignocellulosic ethanol production
- Author
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Narayanaswamy, Naveen, Faik, Ahmed, Goetz, Douglas J., and Gu, Tingyue
- Subjects
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CARBON dioxide , *CORN , *SWITCHGRASS , *LIGNOCELLULOSE , *ETHANOL , *BIOMASS , *GLUCOSE , *ENZYMES , *HYDROLYSIS , *X-ray diffraction , *SCANNING electron microscopy - Abstract
Abstract: Supercritical CO2 (SC-CO2), a green solvent suitable for a mobile lignocellulosic biomass processor, was used to pretreat corn stover and switchgrass at various temperatures and pressures. The CO2 pressure was released as quickly as possible by opening a quick release valve during the pretreatment. The biomass was hydrolyzed after pretreatment using cellulase combined with β-glucosidase. The hydrolysate was analyzed for the amount of glucose released. Glucose yields from corn stover samples pretreated with SC-CO2 were higher than the untreated sample’s 12% glucose yield (12g/100g dry biomass) and the highest glucose yield of 30% was achieved with SC-CO2 pretreatment at 3500psi and 150°C for 60min. The pretreatment method showed very limited improvement (14% vs. 12%) in glucose yield for switchgrass. X-ray diffraction results indicated no change in crystallinity of the SC-CO2 treated corn stover when compared to the untreated, while SEM images showed an increase in surface area. [Copyright &y& Elsevier]
- Published
- 2011
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