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Biomass Behavior upon Fast Pyrolysis in Inert and in $CO_{2}$-Rich Atmospheres: Role of Lignin, Hemicellulose and Cellulose Content
| Content Provider | MDPI |
|---|---|
| Author | Senneca, Osvalda Apicella, Barbara Russo, Carmela Cerciello, Francesca |
| Copyright Year | 2022 |
| Description | The present work focuses on the quality of char and primary tar produced from fast pyrolysis in $N_{2}$ and $CO_{2}$ of lignocellulosic biomasses: walnut shells (lignin-rich), straw (hemicellulose-rich) and pinewood (cellulose-rich). Heat treatments are carried out in a heated strip reactor (HSR) at 1573 and 2073 K for 3 s, with a heating rate of $10^{4}$ K/s. The equipment allows for quenching the volatiles as soon as they are emitted. Chars are analyzed by thermogravimetric analysis in air. Results are compared with the products obtained from raw lignin, pure cellulose and pure hemicellulose. Cellulose and hemicellulose tars are dominated by anhydrous monosaccharides, which are scarce in straw tar and abundant in walnut shells tar. Polycyclic aromatic hydrocarbons PAHs are present in the primary products, in particular for walnut shells. The most reactive char is the one obtained from straw and the least reactive is the walnut shells char. Severe heat treatment and a $CO_{2}$ atmosphere generate additional char components with higher and lower reactivity. The more reactive char component may arise from cross-linking reactions involving the monosaccharides (for which the result decreased in tar), whereas the less reactive component arises from thermal annealing and graphitization. Thus, the pyrolytic behavior of biomasses cannot be reconstructed with a mere addition of the lignin/cellulose/hemicellulose contribution, taking into account their content in the biomass. |
| Starting Page | 5430 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en15155430 |
| Journal | Energies |
| Issue Number | 15 |
| Volume Number | 15 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-27 |
| Access Restriction | Open |
| Subject Keyword | Energies Paper and Wood Pyrolysis Oxy-fuel Coal Biomass Lignin Hemicellulose and Cellulose |
| Content Type | Text |
| Resource Type | Article |
