A DEODORIZER INCLUDES AN ADSORBENT (4) HAVNG A PHYSICAL ADSORPTION CAPABILITY, AN OXIDE (5) CONTAINING COBALT AND HAVING A CATALYTIC ACTIVITY, AND A CARRIER (3) FOR CARRYING THE ADSORBENT (4) AND THE OXIDE (5). THE OXIDE (5) TRANSFORMS ALDEHYDES TO CARBOXYLIC ACIDS, AND THE ADSORBENT (4) REMOVES THE CARBOXYLIC ACIDS BY ADSORPTION.