The 13X/activated carbon composite was treated by 0.2 g·ml-1 glucose solution for carbon deposition. The effect of deposition times on the pore structure

surface properties and separation performance of CH4/N2 were studied. The crystalline

pore structure and surface properties of the samples were investigated by X-ray diffraction (XRD)

N2 adsorption-desorption isotherms at 77 K

scanning electron microscopy (SEM)

CO2-TPD and Fourier transform infrared spectrum (FT-IR). The adsorption isotherms of CH4 and N2 were tested at 298 K and 100 kPa

and compared with the adsorption separation properties of carbon materials and 13X zeolite reported in the literatures. The experimental results showed that the relative content of X zeolite

the micropore surface area and the micropore volume of AC/X-G were gradually decreased with the increase of deposition times. The surface of samples was covered by carbon membrane

which led to decrease of the alkaline functional groups but increase of containing C-O groups. The adsorption capacities of CH4 and N2 decreased

while the adsorption separation coefficient was improved. After third deposition

the adsorption separation coefficient of CH4/N2 reached 3.0. The oxygen-containing functional groups on the surface of AC/X-G were beneficial to improve the separation performance of CH4/N2.