A process for simultaneously reducing the amounts of hydrocarbons carbon monoxide and nitrogen oxides contained in the exhaust gas from an internal combustion engine

摘要

The amt. of hydrocarbons, oxygen contg. organic cpds. CO and NOx present in the exhaust gas of an internal combustion engine is simultaneously reduced by passing the gas over a catalyst consisting of an inert carrier with a catalytically active coating. The coating contains a high surface area carrier material and, if necessary, one or more non-precious metal cpds. and at least one Pt gp. metal. The exhaust gas contains an excess of O2 and the high surface area carrier material contains an aluminosilicate which after 7 h calcination at 950 degrees C in a synthetic exhaust gas contg. 10 vol.% CO2, 6 vol.% O2, 10 vol.% H2O and balance N2, still has a specific surface ≥ 150 m<2>/g. Also claimed is the use of such a catalyst for reducing such exhaust gas emissions.