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

  • Dong-Wan Cho1·Jeong-Yun Jang1,2·Sunjoon Kim2·Gil-Jae Yim1*

  • 1Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources
    2Development of Earth Resources and Environmental Engineering, Hanyang University

  • 커피찌꺼기의 효율적인 열화학 전환을 위한 전이 금속 기반 첨가제 효율 평가

  • 조동완1·장정윤1,2·김선준2·임길재1*

  • 1한국지질자원연구원 광물자원연구본부
    2한양대학교 자원환경공학과

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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 700oC 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

This Article

  • 2022; 27(1): 17-24

    Published on Feb 28, 2022

  • 10.7857/JSGE.2022.27.1.017
  • Received on Nov 29, 2021
  • Revised on Dec 7, 2021
  • Accepted on Jan 25, 2022

Correspondence to

  • Gil-Jae Yim

  • Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources

  • E-mail: gjyim@kigam.re.kr