Adsorbent for nitrogen oxide cpds.

摘要

Adsorbent (IA) for NOx comprises Pt, Au, Ru, Rh, Pd and/or a cpd. of these as active constituent (II), deposited on a support (III). An adsorbent (IB) contg. (II) and a heavy metal oxide (IV) of MN, Fe, Co, Ni, Cu, Zn and/or Pb is also claimed. Pref. (IB) may also contain (III). The amt. of (II) is 0.01-10 (wt.)% w.r.t. (II) + (III) and/or (IV). (II) is Ru. (III) is Al2O3, SiO2, ZrO2, TiO2 or a composite oxide of Al2O3-SiO2, TiO2-SiO2 and/or esp. TiO2-ZrO2.