The selective adsorption of NO on synthetic iron(III) oxide hydroxides

In order to verify the mechanism of selective adsorption of NO from mixed gases on synthetic crystals of α -, β - and γ -FeOOH, the following measurements were carried out at 30 °C: (1) the amount of chemisorption of NO, SO 2 and CO 2 on each FeOOH polymorph which is prechemisorbed by one of the gases, (2) the amount of “exchange” adsorption between NO and SO 2 , when a gas is introduced to the surfaces preoccupied by chemisorption of another gas, and (3) the comparison of the sum of chemisorption values measured separately for NO, SO 2 and CO 2 with the total chemisorption from mixed gas systems NO-SO 2 and NO-CO 2 . The interaction between adsorbate molecules and FeOOH surface has been discussed to deleate probable positions of chemisorption of each adsorbate on predominant crystal surfaces of FeOOH.