Diesel engine emission control: simultaneous IR and kinetic study of low temperature oxidation catalysis

摘要

The development of Low Temperature Combustion Diesel engines requires new exhaust gas treatment catalysts able to oxidise relatively high concentrations of CO and residual hydrocarbons at low temperatures. The new catalytic materials must be durable under the severe post-combustion conditions (e.g. high temperature spikes, high steam concentration) and should contain the lowest possible amount of expensive noble metals. In the present study, operando IR spectroscopy was used to investigate under realistic conditions the oxidation activity of Pt and Pd supported on different oxides, with the aim at generating mechanistic information that will be used for the design of improved formulations. The preliminary results shown here open interesting perspectives for the development of highly active and stable catalysts working in the desired temperature range.