초록 ▼

An add-on H2S trap for use after an auto exhaust catalyst has an H2S-getter metal oxide which traps the H2S by the following reaction: MO+H2S→MS+H2O and the H2S-getter metal oxide is self-regenerating via the following reaction: [Figure] The H2S-getter metal oxide has little tendency to form sulfate

An add-on H2S trap for use after an auto exhaust catalyst has an H2S-getter metal oxide which traps the H2S by the following reaction: MO+H2S→MS+H2O and the H2S-getter metal oxide is self-regenerating via the following reaction: [Figure] The H2S-getter metal oxide has little tendency to form sulfates at a temperature greater than approximately 500°C. Preferred metal oxides are iron, nickel and cobalt and they can be distended over a support.

대표청구항 ▼

An assembly consisting essentially of a three way exhaust gas catalyst over which is passed an automobile exhaust gas to be treated and an H2S trap over which is passed the treated exhaust gas consisting essentially of a support, which is a metal monolith or a ceramic monolith, having distended ther

An assembly consisting essentially of a three way exhaust gas catalyst over which is passed an automobile exhaust gas to be treated and an H2S trap over which is passed the treated exhaust gas consisting essentially of a support, which is a metal monolith or a ceramic monolith, having distended thereover as the active H2S gettering component an H2S-getter metal oxide (MO) (a) which traps the H2S by the following reaction: MO+H2S→MS+H2O (b) which self-regenerates via the following reaction: [Figure] (c) which has little tendency to form sulfates at a temperature greater than approximately 500°C.; said trap device in said automobile engine exhaust system being capable of self regeneration with oxygen under a lean exhaust gas condition; and said trap device having the sole function of adsorbing H2S and not containing any additional exhaust gas catalysts.