| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrocarbon adsorbent having a high hydrocarbon adsorbing capacity and high desorption temp. and having high heat resistance and durability even in a high temp. reducing atmosphere. SOLUTION: The hydrocarbon adsorbent is obtained by supporting silver, phosphorus and iron on zeolite as catalyst components. The support amts. of respective catalyst components are pref. set to 4.0 wt.%<=Ag<=10.0 wt.%, 0.5 wt.%<=P<=2.2 wt.% and 0.3 wt.%<=Fe<=3.0 wt.% when the sum total wt.% of zeolite and the catalyst components is set to 100 wt.%. The sum total support amt. of silver, phosphorus and iron is pref. 5.0 wt.%<=Ag+P+Fe<=12.0 wt.%.
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