A new kind CO2/CH4 separation material: open ended nitrogen doped carbon nanotubes formed by direct pyrolysis of metal organic frameworks

Unprecedented open ended nitrogen doped carbon nanotubes prepared by direct pyrolysis of [Co(HTTG)(H2O)(2)](n) (TTG = N,N',N ''-1,3,5-triazine-2,4,6-triyltris-glycine) show among the largest surface area of multiwalled nanotubes and high CO2/CH4 adsorption selectivity which increases with increasing of nitrogen content.