catalyst for reducing zawartosci trujacych skladnikow in exhaust gas and catalyst for exhaust silnikow way of reducing zawartosci trujacych skladnikow gases burninowych silnikow exhaust

摘要

1465986 Exhaust gas purification catalysts HOECHST AG 12 Nov 1974 [24 Nov 1973] 48885/74 Heading BIE [Also in Division Cl] Catalysts comprise a ceramic honeycomb structure coated with a layer of alumina carrying copper, nickel and manganese oxides applied by impregnation after the coating of the carrier. They may be made by heating the honeycomb to 300-400‹C, introducing it while hot into a concentrated solution of an aluminium salt of a volatile acid for 15-60 min, blowing out excess solution, drying the carrier at room temperature, heating the dry carrier for 1-4 hr. at 350-450‹C, calcining at 500-700‹C for 2-6 hr., heating to 300-400‹C, dipping while hot into a hot concentrated solution of copper, nickel and manganese salts of volatile acids for 15-60 min, blowing out the excess solution, drying for 1-4 hr at 350-450‹C and calcining at 700-1000‹C for 5-20 hrs. The catalyst may be reduced by heating in an atmosphere containing a minor proportion of a gaseous reducing agent.