**4. Conclusions and Future Perspectives**

In this study, an analysis was made of the possibilities of the thermal utilization of the aboveground biomass of the AR weed plant. The results of the proximate and ultimate analysis confirm the potential use of the studied samples in thermochemical conversion processes. TGA showed that the thermal decomposition of the studied AR biomass is similar to the process of pyrolysis of lignocellulosic materials and proceeds in three main stages, which are characterized by the processes of drying, release of volatile components, and carbonation. As a result of the study of the pyrolysis process in a laboratory setting at a temperature of 550 ◦C, three products were obtained: gas, bio-oil, and biochar. The composition of pyrolysis products is dominated by bio-oil or pyrolysis liquid, which is associated with the rich chemical composition of AR biomass. The main part of the oil fraction of AR leaves is aliphatic hydrocarbons (15.5%). The pyrolysis liquid from the inflorescences is represented by oxygen-containing compounds (17%). The chemical composition of the liquid product from AR stems is relatively simple and mainly by phenolic compounds. The results obtained allow us to conclude that the oil fractions of the pyrolysis liquid of AR parts can be used both as a fuel and as a source of valuable chemicals. An analysis of the characteristics and microelement composition of biochars showed that they can be used to produce composite fuel, for example, mixed with coal. It should be noted that all obtained biochars have a high potential as a raw material for the production of soil additives. The results of the study made it possible to study in detail the potential of using AR from its aboveground biomass to produce new liquid and solid products with high added value.

**Author Contributions:** Conceptualization, J.K.; methodology, J.K.; software, S.T. and V.P.; validation, V.B. and V.P.; formal analysis, O.S. and E.L.; investigation, S.T., M.G., M.S., O.S., and E.L.; resources, J.K., V.B., and V.P.; data curation, J.K., S.T., V.B., and V.P.; writing—original draft preparation, S.T., M.S., O.S., and E.L.; writing—review and editing, J.K. and V.B.; visualization, S.T; supervision, V.B. and V.P.; project administration, J.K.; funding acquisition, V.B. and V.P.; All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.

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