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

Dong Wan Cho, Daniel C.W. Tsang, Sohyun Kim, Eilhann E. Kwon, Gihoon Kwon, Hocheol Song

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)


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 (H 2 and CO) and fabricate Co-biochar catalyst (CBC) in one step. The use of CO 2 as atmospheric gas and 110-min pyrolytic time was optimal for generation of H 2 (∼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 .

Original languageEnglish
Pages (from-to)346-351
Number of pages6
JournalBioresource Technology
Publication statusPublished - Dec 2018


  • Carbon-based catalyst
  • Catalytic reduction
  • CO utilization
  • Engineered biochar
  • Lignin valorization
  • Waste biomass recycling

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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