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

Authors: 
Wang, X., South China University of Technology
Li, Z., South China University of Technology
Xia, Q., South China University of Technology
Zhou, X., South China University of Technology

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

Fig. 1 SEM images of C- GLCs

Fig. 2 CO2/CH4/N2 adsorption isotherms of C-GLC-4 at 298 K