커피찌꺼기의 효율적인 열화학 전환을 위한 전이 금속 기반 첨가제효율 평가

Abstract

This work examined the effect of mixing transition metal-based additives [FeCl3, Fe-containing paper mill sludge (PMS),CoCl2·H2O, ZrO2, and α-Fe2O3] on the thermochemical conversion of coffee waste (CW) in carbon dioxide-assistedpyrolysis process. Compared to the generation amounts of syngas (0.7 mole% H2 & 3.0 mole% CO) at 700oC from singlepyrolysis of CW, co-pyrolysis in the presence of Fe- or Zr-based additives resulted in the enhanced production of syngas,with the measured concentrations of H2 and CO ranging 1.1-3.4 mole% and 4.6-13.2 mole% at the same temperature,respectively. In addition, α-Fe2O3 biochar possessed the adsorption capacity of As(V) (19.3 mg g-1) comparable to that ofZrO2-biochar (21.2 mg g-1). In conclusion, solid-type Fe-based additive can be highly considered as an efficient catalyst tosimultaneously produce syngas (H2 & CO) as fuel energy resource and metal-biochar as sorbent.