(EP830199-A1)      Catalyst for treating the exhaust gas of a natural gas fuel engine comprises: (a) a first washcoat support of alumina, (b) a second washcoat support consisting of ceria and lanthana promoted with alumina and (c) Pd and opt. (d) Rh impregnated into the two washcoat supports.    USE -   Used for treating the exhaust gas of a natural gas fuel engine esp. in cars.    ADVANTAGE -   Provides improved conversion of methane, CO and NOx in lean, stoichiometric and rich air/fuel environments.    (US5741467-A)      Catalyst for treating the exhaust gas of a natural gas fuel engine comprises: (a) a first washcoat support of alumina, (b) a second washcoat support consisting of ceria and lanthana promoted with alumina and (c) Pd and opt. (d) Rh impregnated into the two washcoat supports.    USE -   Used for treating the exhaust gas of a natural gas fuel engine esp. in cars.    ADVANTAGE -   Provides improved conversion of methane, CO and NOx in lean, stoichiometric and rich air/fuel environments.    (EP830199-B1)      Catalyst for treating the exhaust gas of a natural gas fuel engine comprises: (a) a first washcoat support of alumina, (b) a second washcoat support consisting of ceria and lanthana promoted with alumina and (c) Pd and opt. (d) Rh impregnated into the two washcoat supports.    USE -   Used for treating the exhaust gas of a natural gas fuel engine esp. in cars.    ADVANTAGE -   Provides improved conversion of methane, CO and NOx in lean, stoichiometric and rich air/fuel environments.    (US6165935-A)      Catalyst for treating the exhaust gas of a natural gas fuel engine comprises: (a) a first washcoat support of alumina, (b) a second washcoat support consisting of ceria and lanthana promoted with alumina and (c) Pd and opt. (d) Rh impregnated into the two washcoat supports.    USE -   Used for treating the exhaust gas of a natural gas fuel engine esp. in cars.    ADVANTAGE -   Provides improved conversion of methane, CO and NOx in lean, stoichiometric and rich air/fuel environments.