Structure and Saccharification of Corn Stover Pretreated with Sulfur Trioxide Micro-Thermal Explosion and Dilute Alkali (STEX-DA)

Zhijiang Dong, Fenghe Li, Huai Wang, Shengsong Deng, Risheng Yao

Abstract


Due to its different organizational structures, dense hard husk, and loose soft core, corn stover (CS) is more resistant to transformation into monosaccharides for biofuel production in comparison to rice straw or wheat straw. In this paper, before pretreatment with sulfur trioxide micro-thermal explosion and dilute alkali (STEX-DA), CS was cut into 2 cm to 3 cm lengths in the transverse direction and cross opening in the vertical direction. During the process of STEX-DA, the structures of cores of corn stover (CS-C) and husks of corn stover (CS-H) were separately studied via scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) analysis. Furthermore, the components content and reducing sugars yield were calculated. The results showed that the CS-C achieved 66.7% of lignin removal rate, and the reducing sugars yield (calculated by original dry weight of straw) was 70.8%, while the CS-H displayed values of 64.7% and 55.3%, respectively. This result indicated that STEX-DA pretreatment could facilitate corn stover usage as a renewable energy source.

Keywords


Corn stover (CS); Pretreatment; Sulfur trioxide micro-thermal explosion (STEX); Reducing sugars yield; Lignin removal

Full Text: PDF

Welcome to BioResources! This online, peer-reviewed journal is devoted to the science and engineering of biomaterials and chemicals from lignocellulosic sources for new end uses and new capabilities. The editors of BioResources would be very happy to assist you during the process of submitting or reviewing articles. Please note that logging in is required in order to submit or review articles. Martin A. Hubbe, (919) 513-3022, hubbe@ncsu.edu; Lucian A. Lucia, (919) 515-7707, lucian.lucia@gmail.com URLs: bioresourcesjournal.com; http://ncsu.edu/bioresources ISSN: 1930-2126