Preparation of efficient carbon monoxide adsorbent from iron(II) chloride, copper(II) chloride, and active carbon.

An adsorbent for carbon monoxide is prepared from 30.0 mmol of copper(II) chloride, 30.0 mmol of iron(II) chloride, and 20.0 g of active carbon. The adsorbing capacity (28.4 mmol) of the adsorbent is 2.1 times as large as the sum (13.7 mmol) of the capacity (11.8 mmol) of the active carbon-supported copper(II) chloride and that (1.9 mmol) of the active carbon-supported iron(II) chloride.