日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

Adsorption of cigarette smoke compounds by H-type faujasite zeolites (H-FAU) was measured to elucidate the correlation between the adsorption efficiency of smoke compounds and characteristics of H-FAU such as pore volume and characteristic adsorption energy for water. The adsorption efficiency of the smoke compounds tended to be increased with the adsorption capacity or pore volume, e.g. the adsorption efficiency of acetone in smoke became double with increasing the pore volume of FAU from 0.37 mL/g to 0.47 mL/g. The smoke components with lower saturated vapor pressure (10⁻²～10³ atm at 298 K) showed higher adsorption efficiencies. On the other hand, the compounds with lower saturated vapor pressure (10⁻⁵～10⁻² atm at 298 K) gave lower adsorption efficiencies. The compounds with very low vapor pressure (less than 10⁻⁵ atm at 298 K) were not adsorbed on H-FAU, because the compounds are low evaporative and exist as aerosols in the smoke. The adsorption efficiency of hydrophobic compounds decreased with increasing the Si/Al ratio of H-FAU. The adsorption balance of smoke compounds could be controlled by the Si/Al ratio: the adsorption of hydrophobic compounds is inhibited by hydrophilic surface of low Si/Al samples. The adsorption amount and adsorption balance of smoke compounds at filter outlet could be controlled by design of the Si/Al ratio of the H-FAU zeolites and the loaded amount of the H-FAU in a cigarette filter.