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Increasing the CO 2 /N 2 Selectivity with a Higher Surface Density of Pyridinic Lewis Basic Sites in Porous Carbon Derived from a Pyridyl‐Ligand‐Based Metal–Organic Framework
Author(s) -
Li Liangjun,
Wang Ying,
Gu Xin,
Yang Qipeng,
Zhao Xuebo
Publication year - 2016
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201600427
Subject(s) - selectivity , carbonization , adsorption , sorption , carbon fibers , ligand (biochemistry) , chemistry , porosity , metal , lewis acids and bases , inorganic chemistry , metal organic framework , organic chemistry , materials science , catalysis , biochemistry , receptor , composite number , composite material
The development of functional porous carbon with high CO 2 /N 2 selectivity is of great importance for CO 2 capture. In this paper, a type of porous carbon with doped pyridinic sites (termed MOFC) was prepared from the carbonization of a pyridyl‐ligand based MOF. Four MOFCs derived from different carbonizing temperatures were prepared. Structural studies revealed high contents of pyridinic‐N groups and nearly the same pore‐size distributions for these MOFCs. Gas‐sorption studies revealed outstanding CO 2 uptake at low pressures and room temperature. Owing to the high content of pyridinic‐N groups, the CO 2 /N 2 selectivity on these MOFCs exhibits values of about 40–50, which are among the top values in carbon materials. Further correlation studies demonstrated that the CO 2 /N 2 selectivities show a positive linear relationship with the surface density of pyridinic‐N groups, thus validating the synergistic effect of the doped pyridinic‐N groups on CO 2 adsorption selectivity.