(253e) Preparation and Its Excellent CO2/CH4/N2 Adsorption Selectivity of Novel Glucose-Based Adsorbents (C-GLC) with High BET Surface Area

Preparation
and Its Excellent CO₂/CH₄/N₂ Adsorption
Selectivity of Novel Glucose-based
Adsorbents (C-GLC)
with High BET Surface Area

Xingjie Wang, Binqin Yuan, Xin Zhou**, Qibin Xia, Zhong Li*

School
of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou
510640, PR China

*Corresponding
author e-mail
address: cezhli@scut.edu.cn

**Corresponding
author e-mail
address: xinzhou@scut.edu.cn

Abstract

In this work, we
used starch sugar£¨e.g. glucose£©, a relatively inexpensive and renewable source, as
carbon source to prepare glucose-based carbons (C-GLCs) materials with high specific
surface area and pore volume. The resultant C-GLCs were characterized, and the CO₂/CH₄/N₂
adsorption isotherms of C-GLCs were measured at different temperatures
separately. The isosteric heats of CO₂/CH₄/N₂
adsorption on the samples were estimated. IAST theory was also applied to
predict the selectivity of the samples toward binary gas mixture. Results
showed that BET area and pore volume of C-GLC-4 were up to 3153 m²/g
and 2.056 cm³/g, respectively. C-GLCs possessed not only excellent
stability, but also super-high CO₂ adsorption capacity up to 22.4 mmol/g
at 30 bar, much higher than many metal-organic frameworks (MOFs). More
importantly, C-GLC-4 possessed excellent adsorption selectivity toward CO₂/N₂
and CO₂/CH₄ binary mixtures, which increased with
pressure. For CO₂/N₂ binary mixture, its IAST-predicted selectivity at 30 bar reached as high as
20 for CO₂/N₂ (0.5:0.5) mixture and 66 for CO₂/N₂
(0.15:0.85) mixture separately. For CO₂/CH₄ binary
mixture, its IAST-predictedselectivity at 30 bar reached as high as 4.5 for CO₂/CH₄
(0.5:0.5) mixture and 27 for CO₂/CH₄ (0.1:0.9)
mixture separately. The multiple cycles of CO₂ adsorption-desorption
experiment showed that the C-GLC-4 has excellent regenerability.
C-GLCs is a promising adsorbent for the separation of
CO₂/N₂ and CO₂/CH₄
mixtures

Keywords: Glucose-based carbon, CO₂
adsorption, Isotherms, CO₂/CH₄/N₂ selectivity,
Isosteric heats