(2019) Applied Thermal Engineering_Beneficial use of CO₂ in pyrolysis of chicken manure to fabricate a sorptive material for CO₂

Kwon G., Cho D.-W., Hyun Moon D., Kwon E.E., Song H.

(Elsevier Ltd) Applied Thermal Engineering ISSN: 13594311 Vol.154 Issue. Article No. DOI: 10.1016/j.applthermaleng.2019.03.110

Pyrolysis of chicken manure was conducted at the fundamental level as a practical example of valorizing animal waste. In particular, to tailor three pyrogenic products (gas, oil, and biochar) via manipulating carbon distribution, carbon dioxide (CO₂) was particularly used as reactive gas medium. Carbon distribution from the liquid phase of pyrogenic oil to the gaseous pyrogenic products while suppressing dehydrogenation was mainly identified in the CO₂ environment. In detail, the more generation of CO was observed in the CO₂ environment, which was ascribed to the homogenous reactions between the liquid phase of pyrogenic products and CO₂. In reference to pyrolysis in an inert (N₂) condition, carbons in pyrolytic oil was used to form CO by the homogeneous reactions. As such, the amount of pyrolytic oil was substantially reduced in the CO₂ atmosphere, which subsequently led to the enhanced generation of CO. Such identified CO₂ effects in pyrolysis of chicken manure were noticeably enhanced due to the catalytic effects imparted from the inorganic constituents including CaCO₃ in the chicken manure sample. Note that the catalytic effects imparted from CaCO₃ was experimentally validated by means of comparing the gas evolution patterns from pyrolysis chicken manure and acid-washed chicken manure in the CO₂ environment. Despite the same mass of biochar both in the N₂ (inert) and CO₂ environments, the chicken manure biochar sample created in the CO₂ environment exhibited the well-developed pore matrix, which led to the high CO₂ sorptive performance. In detail, chicken manure biochar fabricated in the CO₂ environment exhibited three times higher the CO₂ uptake performance as compared with the case of N₂. © 2019 Elsevier Ltd

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( NRF-2017R1D1A1A09000800 ).