Supported catalyst for treating engine exhaust gas - contains metal oxide and platinum, opt. with other platinum gp. metal(s)

摘要

Catalyst for the oxidn. of gaseous hydrocarbons and/or CO, and for redn. of oxides of N contains (a) a carrier, (b) and oxide of Fe, Co, Ni, Cr, W, Zn, Cu, Mn and/or Re, and (c) Pt opt. with Rh, Pd, Ru and/or Ir or their alloys. The catalyst has an acceptable life. So3 and H2SO4 are not produced. The support may be monolithic or particulate, esp. carrying a coating of Al2O3 + CeO2. Pref. (b) is NiO and (c) is Pt + Rh or Pt + Pd + Rh. Exhaust gas may pass through 2 catalyst beds, with injection of air between them.