Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H 2 Generation and Use of the Biochars for CO 2 Capture.
Isaac Dos S NunesCarlos SchnorrDaniele PerondiMarcelo GodinhoJulia C DielLauren M M MachadoFabíola B Dalla NoraLuis F O SilvaGuilherme Luiz DottoPublished in: Molecules (Basel, Switzerland) (2022)
This work valorizes butiá pomace ( Butia capitata ) using pyrolysis to prepare CO 2 adsorbents. Different fractions of the pomace, like fibers, endocarps, almonds, and deoiled almonds, were characterized and later pyrolyzed at 700 °C. Gas, bio-oil, and biochar fractions were collected and characterized. The results revealed that biochar, bio-oil, and gas yields depended on the type of pomace fraction (fibers, endocarps, almonds, and deoiled almonds). The higher biochar yield was obtained by endocarps (31.9%wt.). Furthermore, the gas fraction generated at 700 °C presented an H 2 content higher than 80%vol regardless of the butiá fraction used as raw material. The biochars presented specific surface areas reaching 220.4 m 2 g -1 . Additionally, the endocarp-derived biochar presented a CO 2 adsorption capacity of 66.43 mg g -1 at 25 °C and 1 bar, showing that this material could be an effective adsorbent to capture this greenhouse gas. Moreover, this capacity was maintained for 5 cycles. Biochars produced from butiá precursors without activation resulted in a higher surface area and better performance than some activated carbons reported in the literature. The results highlighted that pyrolysis could provide a green solution for butiá agro-industrial wastes, generating H 2 and an adsorbent for CO 2 .