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Issue 39, 2017, Issue in Progress
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Zeolite cage-lock strategy for in situ synthesis of highly nitrogen-doped porous carbon for selective adsorption of carbon dioxide gas

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Abstract

Nitrogen-doped porous carbon (NPC) was prepared by directly carbonizing zeolite ZSM-39 containing a structure-directing agent, tetramethylammonium chloride (TMACl), which also acted as a source of C and N for NPC. The cage-like pore of zeolite ZSM-39 acted as an ideal space for immobilizing the C and N species. The obtained NPCs have a high N content up to 18.14%. The quaternary N of template TMACl was transformed into pyridinic and pyrrolic/pyridonic N during the carbonization. NPCs were suitable for selective adsorption of CO2 because of their unique ultra-micropores and abundant basic sites. The adsorption selectivity of CO2 over N2 was more than 12.1 (molar ratio). The CO2 adsorption capacity of the unit surface area for a NPC-723 sample was calculated as 26.6 μmol m−2 at 0.93 bar and 273 K, which is one of the highest values among carbon adsorbents. Its excellent selectivity makes the NPC a good candidate for separating low concentrations of CO2 in the purification of gas mixtures.

Graphical abstract: Zeolite cage-lock strategy for in situ synthesis of highly nitrogen-doped porous carbon for selective adsorption of carbon dioxide gas

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Supplementary files

Article information


Submitted
18 Nov 2016
Accepted
19 Apr 2017
First published
03 May 2017

This article is Open Access

RSC Adv., 2017,7, 24195-24203
Article type
Paper

Zeolite cage-lock strategy for in situ synthesis of highly nitrogen-doped porous carbon for selective adsorption of carbon dioxide gas

C. Xue, H. Zhu, T. Xu, E. Wang, B. Xiao, X. Liu, X. Hao and G. Guan, RSC Adv., 2017, 7, 24195
DOI: 10.1039/C6RA26997D

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