Regulation effect of blending coal on pore structure of coal-based activated carbon prepared by briquetting method

A series of activated carbon were prepared by briquetting method from Datong bituminous coal and Taixi anthracite coal or Huolihe lignite blending with out binder.In order to investigate regulation effect of blending coal on pore structure of activated carbon, the experiments of mass ratio 100 : 0, 80 : 20, 60 : 40, 40 60 and 20 : 80 of bituminous coal and blending coal were carried out.The pore structure of activated carbons samples were characterized by iodine number, methyle ne blue value and caramel decolored ratio, besides its pore volume and pore size distribution (PSD) were obtained using Density Functional Theory (DFT) to calculating N2 adsorption/desorption isotherm of nitrogen at 77 K. The results show that anthracite coal or lignite as blending coal make the pore development to the different direct ion.' The blend of anthracite coal can prompt generating new micropores, enriching microspores and improving total pore volume.The iodine number and methylene blue value of activated carbon samples were gradually increased with the growth of anthracite coal mass ratio, which from 579 mg/g and 128 mg/g to the 979 mg/g and 135 mg/g respectively.However, lignite blending with bituminous coal lead to transition to expanding pore stage after a short period of time development of micropores, decr easing total pore volume and improving mesopore volume.The activated carbon prepared in the mass ratio 20 : 80 of bituminous coal with lignite has an iodine number of 681 mg/g, methylene blue value of 681 mg/g and caramel decolored ratio of 18%.