Gm Global Technolgoy Operations, Inc.

Tianjin University

Xinquan Wang

Wei Ping Li

Gongshin Qi

Meiqing Shen

A non-stoichiometric perovskite oxide having the general chemical formula LaMnO, in which the molar ratio of lanthanum to manganese ('X') ranges from 0.85 to 0.95, can be used in particle form as an oxidation catalyst to oxidize NO to NOin an exhaust aftertreatment system for a hydrocarbon-fueled engine. The oxygen content ('Y') fluctuates with variations in the molar ratio of lanthanum to manganese but generally falls somewhere in the range of 3.0 to 3.30. The crystal lattice adjustments spurred by the non-stoichiometric molar ratio of lanthanum to manganese are believed responsible for an enhanced NO oxidative activity relative to similar perovskite oxides with a higher molar ratio of lanthanum and manganese.

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Tianjin, China

Xinquan Wang