J. De Wilde et Gb. Marin, Investigation of simultaneous adsorption of SO2 and NOx on Na-gamma-alumina with transient techniques, CATAL TODAY, 62(4), 2000, pp. 319-328
The simultaneous adsorption of SO2 and NOx on Na-gamma -alumina was studied
by means of step experiments in a fixed bed plug flow reactor at 387 K and
atmospheric pressure. Typically the molar composition of the feed gas was
1.5% SO2, 1% O-2, 4000 ppm NO, 500 ppm NO2, and Ar. First the adsorption be
havior of the pure components was measured. SO2 and NO2 adsorb easily, wher
eas NO and O-2 do not adsorb. Moreover there is no influence of O-2 On the
adsorption behavior of the pure components.
NO and O-2 adsorption require the simultaneous presence of SO2 NO, and O-2.
The NO and O(2)adsorption rate is enhanced by an increasing SO2/NO ratio.
The total amount of SO2 adsorbed is not affected by the simultaneous adsorp
tion of NO and O-2 However, NO2 adsorption increases the SO2 adsorption cap
acity. In the presence of NO2 most of the adsorbed NO, is released as NO. (
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