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Preparation of hydrothermal carbon acid catalyst from defatted rice bran

Wataniyakul, Piyaporn, Boonnoun, Panatpong, Quitain, Armando T., Kida, Tetsuya, Laosiripojana, Navadol, Shotipruk, Artiwan
Industrial crops and products 2018 v.117 pp. 286-294
biomass, carbon, carbonization, catalysts, catalytic activity, cellulose, formic acid, furfural, hydrolysis, hydroxymethylfurfural, leaching, levulinic acid, rice bran, temperature
In this study, the effects of carbonization conditions: temperature (180–250 °C) and time (1–8 h) on the yield and the chemical characteristics of hydrothermal carbon derived from defatted rice bran (HTCDRB) were determined. The morphological and chemical characteristics of the sulfonated HTCDRB catalyst were also examined. In addition, the stability of the catalyst was evaluated based on the amounts of biomass conversion products (5-hydroxymethylfurfural (HMF), furfural, levulinic acid and formic acid) leached into water at a specified biomass conversion condition. Since no HMF and furfural, and only small amounts of levulinic acid (1.75 wt.%), and formic acid (0.42 wt.%), were leached from the catalyst synthesized from HTCDRB prepared at the carbonization condition of 220 °C for 3 h, this condition was suggested to be a suitable carbonization condition. Despite having similar structural and chemical characteristics, the leaching test suggested that the DRB-based hydrothermal carbon catalyst was found to be more stable than the glucose-based hydrothermal carbon catalyst, prepared at the same condition. The catalytic activity for cellulose hydrolysis of the catalyst was higher than that of the commercial Amberlyst 16 WET catalyst.