Preparation of molded biomass carbon from coffee grounds and its CH<sub>4</sub>/N<sub>2</sub> separation performance

GAO Yu-zhou; Xu Shuang; WANG Cheng-tong; ZHANG Xue-jie; LIU Ru-shuai; LU An-Hui

doi:10.1016/S1872-5805(22)60626-7

Volume 37 Issue 6

Nov. 2022

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Article Navigation > New Carbon Mater. > 2022 > 37(6): 1145-1153

GAO Yu-zhou, Xu Shuang, WANG Cheng-tong, ZHANG Xue-jie, LIU Ru-shuai, LU An-Hui. Preparation of molded biomass carbon from coffee grounds and its CH4/N2 separation performance. New Carbon Mater., 2022, 37(6): 1145-1153. doi: 10.1016/S1872-5805(22)60626-7

Citation:

GAO Yu-zhou, Xu Shuang, WANG Cheng-tong, ZHANG Xue-jie, LIU Ru-shuai, LU An-Hui. Preparation of molded biomass carbon from coffee grounds and its CH₄/N₂ separation performance. New Carbon Mater., 2022, 37(6): 1145-1153. doi: 10.1016/S1872-5805(22)60626-7

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Preparation of molded biomass carbon from coffee grounds and its CH₄/N₂ separation performance

doi: 10.1016/S1872-5805(22)60626-7

School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

Funds: Projects of Sinopec Dalian Institute (HX20200500), Program for Liaoning Innovative Research Team in University (LT2016001), Fundamental Research Funds for the Central Universities (DUT20GJ215).

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Corresponding author: LU An-hui, Ph.D, Professor. E-mail: anhuilu@dlut.edu.cn
Received Date: 2022-04-24
Rev Recd Date: 2022-06-14

Available Online: 2022-06-29

Publish Date: 2022-11-28

Abstract

Abstract

Coffee grounds are promising precursors for excellent porous carbon adsorbents. During the preparation of the porous carbons, sodium silicate was used as a binder and pore-forming agent, and extrusion molding technology was used to prepare them in a columnar form. After carbonization, steam activation and silica removal by alkaline washing, high-strength columnar porous carbon adsorbents (CGCs) were obtained. Their CH₄/N₂ separation performance was studied by multicomponent breakthrough experiments. The Brunauer-Emmett-Teller (BET) surface area of CGC-1.5 (where 1.5 is the mass ratio of a 9 wt% sodium silicate aqueous solution to the coffee grounds) is 527 m²·g⁻¹. Both the N₂ and CO₂ adsorption isotherms show that the CGCs are rich in micropores and mesopores, with the micropores mainly centered at about 0.48 nm. FT-IR results show that CGC-1.5 has abundant oxygen-containing functional groups. At 298 K and 1 bar, its equilibrium adsorption capacity for CH₄ is 0.87 mmol·g⁻¹, and the separation selectivity for a CH₄/N₂ mixture (3/7, vol/vol) is 10.3, which is better than most biomass-based porous carbon adsorbents and crystalline materials. Dynamic breakthrough tests show that CGC-1.5 has an excellent CH₄/N₂ separation performance at both high and atmospheric pressures. The dynamic selectivities at 298 K, 1.1 bar and 5 bar are 10.4 and 17.9, respectively. The adsorption capacity is unchanged after 10 adsorption-desorption cycles. The mechanical strength of CGC-1.5 is as high as 123 N·cm⁻¹, which meets the criteria of industrial applications.
- Coffee grounds,
- Extruded,
- Porous carbon,
- CH₄/N₂ separation

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References(30)

References

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