Technical Paper
Optimized Three-Way Catalysts for Emission Control on a Heavy-Duty Stoichiometric Natural Gas Engine
2022-03-29
2022-01-0588
Natural gas (NG) engines have attracted increasing attention in the heavy duty (HD) vehicle market as an alternative to conventional diesel fuel often due to the abundance and low price of NG. However, it is challenging to meet the increasingly stringent China VI legislation, particularly for hydrocarbons (mainly CH4), carbon monoxide (CO), nitrogen oxides (NOx) and ammonia (NH3). In this work, approaches were explored in which a gasoline three-way catalyst (TWC) was modified through optimization of promoters, OSC materials, and catalyst structure. The optimized TWC was evaluated in a laboratory reactor and with a HD stoichiometric NG engine. Lab reactor results showed that promoters can improve CH4 light off performance with T50 decreases of 20 oC and 13 oC for the fresh and aged catalyst respectively.