| 摘要 |
To provide a gas adsorbent which has sufficient gas adsorptivity for noxious gas components in a cigarette when brought into contact with a gas stream having a high flow rate as that when it passes through a cigarette filter, and which releases a small amount of bad odor components such as amine impurities and free noxious components which adversely affect health such as aromatic compounds derived from the gas adsorbent itself. A gas adsorbent which satisfies the following conditions (I), (II), (IV) and (V) or the following conditions (I), (III), (IV) and (V): (I) the mean pore radius of the gas adsorbent is at least 330 Å and at most 3,000 Å as measured by a mercury porosimeter; (II) the amine elution amount from the gas adsorbent per unit mass is at most 10 mueq/g; (III) the content of a monocyclic aromatic compound represented by the following formula 1 in the gas adsorbent per unit mass is at most 4 mg/g: wherein R is a substituent selected from the group consisting of a hydroxyl group, a C1-3 alkyl group and a C2-3 alkenyl group, and n is an integer of from 1 to 6 and represents the number of the substituent R, provided that when there are a plurality of R's, the respective R's may be the same or different; (IV) the neutral salt decomposition capacity is at most 0.43 meq/g; and (V) the acid adsorption capacity of the gas adsorbent per unit mass is at least 1.5 meq/g.
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