title: Increasing the CO2 /N2 Selectivity with a Higher Surface Density of Pyridinic Lewis Basic Sites in Porous Carbon Derived from a Pyridyl-Ligand-Based Metal-Organic Framework.
abstract: The development of functional porous carbon with high CO2 /N2 selectivity is of great importance for CO2 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 CO2 uptake at low pressures and room temperature. Owing to the high content of pyridinic-N groups, the CO2 /N2 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 CO2 /N2 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 CO2 adsorption selectivity.
authors.affiliation: Research Center of New Energy Science and Technology, Unconventional Oil & Gas and Renewable Energy Research Institute, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
authors.forename: Liangjun
authors.initials: L
authors.lastname: Li
authors.affiliation: Research Center of New Energy Science and Technology, Unconventional Oil & Gas and Renewable Energy Research Institute, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Research Center of New Energy Science and Technology, Unconventional Oil & Gas and Renewable Energy Research Institute, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
authors.forename: Xin
authors.initials: X
authors.lastname: Gu
authors.affiliation: School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao, 266580, P. R. China.
authors.forename: Qipeng
authors.initials: Q
authors.lastname: Yang
authors.affiliation: Research Center of New Energy Science and Technology, Unconventional Oil & Gas and Renewable Energy Research Institute, China University of Petroleum (East China), Qingdao, 266580, P. R. China. zhaoxuebo@upc.edu.cn.
authors.forename: Xuebo
authors.initials: X
authors.lastname: Zhao
keywords: Lewis bases; adsorption; carbon; gas selectivity; metal-organic frameworks