PROBLEM TO BE SOLVED: To provide a gas adsorbent excellent in adsorption efficiency of malodorous gases, particularly lower aldehyde, and excellent in adsorption efficiency even after stored in air, and to provide an adsorption method of lower aldehyde using the gas adsorbent, an adsorption filter containing the adsorbent, and a production method of the adsorbent.SOLUTION: There are provided [1] the gas adsorbent containing (C) a porous carrier loading (A) aliphatic polyhydric amine having the total number of amino groups in a molecule of 3 or more and (B) an acid having an acid dissociation constant pKa in water at 25°C of 2 to 9, and having a ratio of an acid equivalent of the acid (B) to a base equivalent of the aliphatic polyhydric amine (A) of 10 to 90%, [2] the adsorption method using the gas adsorbent of [1], [3] the gas adsorption filter containing the gas adsorbent of [1], and [4] the production method of the gas adsorbent.COPYRIGHT: (C)2014,JPO&INPIT【課題】悪臭ガス、特に低級アルデヒドの吸着効率に優れ、空気中での保存後であっても吸着効率に優れるガス吸着剤、それを用いる低級アルデヒドの吸着方法、当該吸着剤を備える吸着フィルター、及び当該吸着剤の製造方法を提供する。【解決手段】[1]1分子中のアミノ基の合計数が3以上である脂肪族多価アミン(A)と、25℃における水中の酸解離定数pKaが2~9である酸(B)とを添着した多孔質担体(C)を含有し、脂肪族多価アミン(A)の塩基当量に対する、酸(B)の酸当量の比率が10~90%であるガス吸着剤、[2]前記[1]のガス吸着剤を用いる低級アルデヒドの吸着方法、[3]前記[1]のガス吸着剤を備えるガス吸着フィルター、[4]ガス吸着剤の製造方法。【選択図】なし
