A study on the consecutive preparation of d-xylose and pure superfine silica from rice husk

A new route for preparation of hydrochars from rice husk

“…The elemental analysis of RH was 37.05 wt% C, 8.80 wt% H, 11.06 wt% N and 40.44 wt% O. The main constituent of RH was 18.2 wt% hemicellulose, 35.2 wt% cellulose, 24.5 wt% lignin and 18.8 wt% silicon dioxide, which was almost consistent with our previous work (Zhang et al, 2010). Sulfuric acid used in the synthetic procedures of this work was purchased from Beijing Chemicals Co. Ltd, which was of analytical grade.…”

“…Biomass is a qualified carbon raw material for synthesis of valuable carbonaceous materials because it is available in high quality and huge amount. For example, the annual output of rice husk (RH) of world and China is about 80 and 40 million tons, respectively (Zhang et al, 2010). RH is an agricultural byproduct abundant in all rice producing countries.…”

The Effect of Severity Factor on the Release of Xylose and Phenolics from Rice Husk and Rice Straw

“…However, the selectivity of the RS hydrolysate was lower than that reported by Roberto et al [22]. The xylose yield obtained from RH was similar to Dagnino et al [2] who studied the dilute acid hydrolysis of RH, but lower than Zhang et al [21] who treated RH at 130°C with 4 % H 2 SO 4 for 2 h and achieved a xylose yield of up to 96 %. The results of dilute acid hydrolysis of lignocellulosic biomass studies show general trend of increasing xylose yield with increasing pretreatment SF.…”

“…Due to its amorphous structure, the hemicellulosic fraction of lignocellulosic materials can be easily hydrolyzed by dilute acid treatment, whereas the cellulosic and lignin fractions remain unaltered. Several researchers have studied the dilute acid hydrolysis of different lignocellulosic wastes, such as corn stover [11,12], eucalyptus residue [13], palm waste [14], rapeseed straw [10,15,16], barley straw [10,17,18], wheat straw [19,20], rice husk [2,21] and rice straw [10,[22][23][24][25][26]. However, there are several disadvantages of the dilute acid hydrolysis of these lignocellulosic wastes, such as the production of inhibitors, including acetic acid, furfural [9,17] and phenolics from lignin degradation products [19] and the corrosion of equipment.…”

High surface area porous carbons prepared from hydrochars by phosphoric acid activation

“…As is well-known, fossil fuels are finite, and lignocellulosic agricultural wastes are investigated as precursors vastly due to their renewability and huge amount. For example, the annual output of rice husk (RH) worldwide and China is about 80 and 40 million tons respectively (Zhang et al, 2010). Chemical activation is a well-known method to obtain high-performance porous carbons.…”