Combining with instant catapult steam explosion (ICSE)

corn stalk was pretreated by different chemical methods

including dilute acid

sodium hydroxide

aqueous ammonia

organic solvent

and ionic liquid. In order to obtain a green and highly efficient process

materials were analyzed by components and enzymatic hydrolysis analysis. ICSE could significantly prompt the effects of chemical methods on lignocellulose pretreatment. Among these approaches

ICSE combined with sodium hydroxide had the highest glucose yield 77.54%. Meanwhile

compared with the solo ionic liquid pretreated method

ICSE combined with ionic liquid pretreatment increased glucose yield by 7.78 folds

reaching 60.04%. Considering the requirements of efficiency

green process and low energy cost on pretreatment

the method of ICSE plus ionic liquid was selected as the optimal method and materials then were analyzed with Fourier transformed infrared (FT-IR)

X-ray diffraction (XRD) and scanning electron microscope (SEM) to analyze its mechanism. The materials treated by ICSE were porous

unconsolidated

low hemicellulose content and inclined to be dissolved by ionic liquid. When ICSE was combined with ionic liquid pretreatment

lignocellulosic cellulose components were transformed from cellulose-Ⅰ to cellulose-Ⅱ with the lowest crystallinity index.