Method for reducing evaporated fuel emission, canister and adsorbent therefor

A method for reducing release of an evaporated fuel, which comprises allowing a gaseous evaporated fuel to flow from at least one first compartment filled with a first adsorbent toward at least one second compartment filled with a second adsorbent for sequentially adsorbing the evaporated fuel onto the first adsorbent and the second adsorbent, and purging a gas from the second compartment toward the first compartment for desorbing the adsorbed evaporated fuel from the second adsorbent and the first adsorbent,

• wherein the second adsorbent has:
• a difference in n-butane adsorption volume of not less than 35 g/L between a n-butane vapor concentration of 5% by volume and a n-butane vapor concentration of 50% by volume measured at 25° C.,
• a butane working capacity measured in accordance with ASTM D5228 of not less than 8 g/dL, and
• a butane desorption rate of not less than 45% when a purge air amount measured in accordance with ASTM D5228 is 30 bed volumes of the adsorbent volume, and
• the second adsorbent comprises an activated carbon as an adsorption site and a solid diluent as a non-adsorption site.