Value-added biocarbon production through slow pyrolysis of mixed bio-oil wastes: studies on their physicochemical characteristics and structure–property–processing co-relation

Abstract

In this work, mixed bio-oil (MBO) is transformed into valuable biocarbon through slow pyrolysis technique. MBO was accomplished in a semi-batch reactor at 600 and 900 °C temperature, 10 °C min−1 heating rate, and 30 min holding time under a non-oxidizing environment. The produced mixed bio-oil-derived biocarbon (MBOB) was characterized by its surface properties, thermal stability, elemental composition, thermal conductivity, BET surface area, surface morphology, and electrical conductivity. The pyrolysis outcomes established that the temperature has a predominant impact on the variation in yield and properties of MBOB. Characterization results of MBOB exposed increased properties (thermal stability, electrical and thermal conductivity, graphitic content, carbon content, and HHV) at 900 compared to 600 °C. Also, the elemental and EDS investigation of MBOB established a broad diminution in O2 and H2 at 900 than 600 °C. The purest form of carbon with enhanced thermal stability, higher carbon content, smoothness, and bigger particles of biocarbon (verified by SEM) is accomplished at 900 °C. The electrical and thermal conductivity (EC and TC) of MBOB increased with increasing the temperature from 600 to 900 °C due to the close contact of biocarbon particles. Finally, an investigation of the particle size of MBOB established that the majority of particles are within 1.5 to 1.7 µm. Graphical abstract

Pyrolysis of low-value waste sawdust over low-cost catalysts: physicochemical characterization of pyrolytic oil and value-added biochar

“…The peak at 1714 cm -1 demonstrated the presence of ketone groups because of C=O stretching vibrations. The presence of aromatics and alkene was reflected at the peak of 1620 cm -1 due to C=C stretching vibrations (Mishra et al, 2022c). The peak at 1330-950 cm -1 associated with the C-O stretching revealed the presence of ester and ethers and the deformation of these functional groups, whereas the peak at 1453 cm -1 arose from the C-C bond representing the alkyne groups (Garg et al, 2016).…”