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. 2022 Nov 3;27(21):7515.
doi: 10.3390/molecules27217515.

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

Isaac Dos S Nunes  1 , Carlos Schnorr  2 , Daniele Perondi  3 , Marcelo Godinho  3 , Julia C Diel  1 , Lauren M M Machado  1 , Fabíola B Dalla Nora  1 , Luis F O Silva  2 , Guilherme L Dotto  1
Affiliations

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

Isaac Dos S Nunes et al. Molecules. .

Abstract

This work valorizes butiá pomace (Butia capitata) using pyrolysis to prepare CO2 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 H2 content higher than 80%vol regardless of the butiá fraction used as raw material. The biochars presented specific surface areas reaching 220.4 m2 g-1. Additionally, the endocarp-derived biochar presented a CO2 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 H2 and an adsorbent for CO2.

Keywords: CO2 adsorption; H2 generation; butiá biochar; butiá wastes; pyrolysis.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Thermogravimetric and derived curves to precursors (a) FIB, (b) ALM, (c) END, and (d) DOA.
Figure 2
Figure 2
Product yields from pyrolysis of END, FIB, ALM, and DOA at 700 °C.
Figure 3
Figure 3
Effect of temperature on gas production during the pyrolysis of (a) FIB, (b) ALM, (c) END, and (d) DOA.
Figure 4
Figure 4
SEM micrographs of (a) FIB.700, (b) ALM.700, (c) END.700 and (d) DOA.700.
Figure 5
Figure 5
CO2 adsorption capacity of biochars from FIB, ALM, END, and DOA.
Figure 6
Figure 6
CO2 adsorption cycles in biochars (a) FIB.700, (b) ALM.700, (c) END.700 and (d) DOA.700.
See this image and copyright information in PMC

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