Abstract
The adsorption properties of nitrogen monoxide (NO) on copper or silver ion-exchanged zeolites were examined by adsorption-desorption measurement in a fixed bed flow apparatus. The amounts of reversible (q*rev) and irreversible (q*irr) adsorption per Cu or Ag ion exchanged were increased with decreasing the aluminum content of zeolite. Both amounts on MFI zeolite were constant independent of the ion exchange level, while on MOR changed with the exchange level. The temperature dependencies of qrev revealed that Ag and Cu ion-exchanged zeolites are useful adsorbents at <273 K and 280-333 K, respectively. The irreversibly adsorbed species on the copper ion-exchanged ZSM-5 zeolites gave the desorption peaks at 400, 463, and 663 K in temperature-programmed desorption (TPD) chromatograms. The total amount of NO desorbed in the TPD experiment is in good agreement with the amount of irreversible evaluated from the adsorption-desorption measurement.
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