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Thermochemical conversion of cobalt-loaded spent coffee grounds for production of energy resource and environmental catalyst

Cho, Dong-Wan, Tsang, Daniel C.W., Kim, Sohyun, Kwon, Eilhann E., Kwon, Gihoon, Song, Hocheol
Bioresource technology 2018 v.270 pp. 346-351
X-ray diffraction, X-ray photoelectron spectroscopy, carbon, carbon dioxide, carbon monoxide, case studies, catalysts, cobalt, hydrogen, p-nitrophenol, physicochemical properties, pyrolysis, reaction kinetics, scanning electron microscopy, synthesis gas, transmission electron microscopy
Thermochemical conversion of cobalt (Co)-loaded lignin-rich spent coffee grounds (COSCG) was carried out to find the appropriate pyrolytic conditions (atmospheric gas and pyrolytic time) for syngas production (H2 and CO) and fabricate Co-biochar catalyst (CBC) in one step. The use of CO2 as atmospheric gas and 110-min pyrolytic time was optimal for generation of H2 (∼1.6 mol% in non-isothermal pyrolysis for 50 min) and CO (∼4.7 mol% in isothermal pyrolysis for 60 min) during thermochemical process of COSCG. The physicochemical properties of CBC fabricated using optimized pyrolytic conditions for syngas production were scrutinized using various analytical instruments (FE-SEM, TEM, XRD, and XPS). The characterizations exhibited that the catalyst consisted of metallic Co and surface wrinkled carbon layers. As a case study, the catalytic capability of CBC was tested by reducing p-nitrophenol (PNP), and the reaction kinetics of PNP in the presence of CBC was measured from 0.04 to 0.12 s−1.