초록 ▼

This is a self-regenerating catalyst member which may be used to remove particulate carbon and residual hydrocarbonaceous material from engine exhaust, especially those emanating from diesel engines. Specifically, the invention is an oxidation catalyst preferably placed onto a particulate trap or co

This is a self-regenerating catalyst member which may be used to remove particulate carbon and residual hydrocarbonaceous material from engine exhaust, especially those emanating from diesel engines. Specifically, the invention is an oxidation catalyst preferably placed onto a particulate trap or collector and placed in the exhaust circuit of a diesel engine. The catalytic material involved is specially formulated to form what are believed to be large particle, multi-metal oxide-based catalytic particles. The catalytic particles may be perovskites. The catalytic materials of this invention include at least one member selected from Group IB metals, preferably copper, and at least one member selected from Group VIII metals, preferably iron, and compounds thereof and Group 5B metals, preferably vanadium or vanadium compounds. Optionally, one or more Platinum Group metals (Ru, Rh, Pd, Re, Os, and Pt) may be added if so desired. The specific method of preparing the active oxidation components of the composition is believed to provide the improved composition. The composition is long-lived and is self-regenerating at most diesel exhaust gas temperatures.

대표청구항 ▼

[ I claim as my invention:] [1.] A low temperature diesel exhaust soot oxidation catalyst comprising:a porous refractory metal or metal oxidic support, anda wash coat formed by the steps of mixing an acidic iron-containing compound and a copper-containing compound, adding an aqueous alkali metal sal

[ I claim as my invention:] [1.] A low temperature diesel exhaust soot oxidation catalyst comprising:a porous refractory metal or metal oxidic support, anda wash coat formed by the steps of mixing an acidic iron-containing compound and a copper-containing compound, adding an aqueous alkali metal salt solution, adding an acidic vanadium-containing compound solution, and adding of an alkaline earth metal compound slurry.