Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
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Study on CH4/N2 Adsorption Separation Performance on Corncob-based Activated Carbon
DOI:
10.16355/j.cnki.issn1007-9432tyut.2019.06.011
Received:
Accepted:
| Corresponding author | Institute | |
| CHENG Wenping | College of Chemistry and Chemical Engineering, Taiyuan University of Technology |
abstract:
The adsorption separation of CH4/N2 in coal bed methane has always been one of the difficult problems in the pressure swing adsorption separation, and the preparation of high-performance adsorbents is the key to solve this problem. Corncob-based activated carbon was prepared by one-step chemical activation using KOH as activating reagent. The influences of active temperatures on pore structure, surface properties and CH4/N2 separation performance of corncob-based activated carbon were investigated. The elemental composition, pore structure and surface properties of the samples were characterized by Fourier transform infrared spectrometry
（FTIR）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS） and N2 adsorption-desorption isotherms at-196 ℃. The adsorption isotherms of CH4 and N2 were measured at 25 ℃, 100 kPa, and the data were fitted with Freundlich model. The results show that with the increase of activation temperature, the surface area, micropore surface area and micropore volume of activated carbon increased, while the amount of oxygen functional groups on the surface decreased. Furthermore, the adsorption capacities of CH4 and N2 depended on the pore volume of 0.47～0.90 nm, while the CH4/N2 selectivity was related to the value of V0.47～0.55 nm/V0.47～0.90 nm and the amount of oxygen-containing functional groups. Activated carbon AC-T700 obtained the highest CH4 adsorption capacity of 35.3 cm3/g, and the adsorption separation coefficient of CH4/N2 reached 3.5.
Keywords:
activated carbon;adsorption;separation;surface;CH4/N2