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http://dx.doi.org/10.7857/JSGE.2022.27.1.017

Efficiency Evaluation of Transition Metal-Based Additives for Efficient Thermochemical Conversion of Coffee Waste  

Cho, Dong-Wan (Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources)
Jang, Jeong-Yun (Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Sunjoon (Development of Earth Resources and Environmental Engineering, Hanyang University)
Yim, Gil-Jae (Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of Soil and Groundwater Environment / v.27, no.1, 2022 , pp. 17-24 More about this Journal
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-assisted pyrolysis process. Compared to the generation amounts of syngas (0.7 mole% H2 & 3.0 mole% CO) at 700℃ from single pyrolysis 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 of ZrO2-biochar (21.2 mg g-1). In conclusion, solid-type Fe-based additive can be highly considered as an efficient catalyst to simultaneously produce syngas (H2 & CO) as fuel energy resource and metal-biochar as sorbent.
Keywords
Spent coffee grounds; Transition metal; Co-pyrolysis; Synthetic gas; Engineered biochar;
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