Gas adsorbent, deodorant fiber sheet, and method for preparing gas adsorbent

The purpose of the present invention is to provide a gas adsorbent which has excellent adsorption performance for low-boiling point aldehydes and also has excellent performance for suppressing the desorption of low-boiling point aldehydes and low-polar gases from a gas adsorbent, once the low-boiling point aldehydes and the low-polar gases have been adsorbed onto the gas adsorbent. This purpose isachieved by providing a gas adsorbent containing: a proton-type Y zeolite; and a water-soluble acid hydrazide compound, wherein the proton-type Y zeolite contains SiO2 and Al2O3, and the molar ratioof SiO2 to Al2O3 contained (mole of SiO2 contained/mole of Al2O3 contained) therein is 2-20. 本发明的课题在于，提供低沸点醛类的吸附性能优异、且在该气体吸附剂上暂时吸附的低沸点醛类和低极性气体类从气体吸附剂的脱离被抑制的性能优异的气体吸附剂。其解决手段是气体吸附剂，其含有质子型的Y型沸石和水溶性的酰肼化合物，前述质子型的Y型沸石含有SiO和AlO，前述质子型的Y型沸石中的SiO与AlO的摩尔含量比(SiO的摩尔含量/AlO的摩尔含量)为2以上且20以下。