DOC and particulate control system for diesel engines
AssigneeBASF Catalysts LLC
InventorSanath V. Kumar
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Abstract
The present invention is directed to an emission treatment system for the treatment and/or conversion of engine emissions and particulate matter from diesel engines. The emission treatment system of the present invention comprises an upstream oxidation catalyst, a particulate filter or soot filter section and optionally a downstream catalytic element or clean-up catalyst for the treatment and/or conversion of any remaining emission gas stream contaminants.
Claims12
An exhaust treatment system for treating an exhaust gas stream produced by a small diesel engine comprising:
- a. an upstream oxidation catalyst deposited on a ceramic or metallic honeycomb flow-through substrate;
- b. a partial particulate filter located downstream of said oxidation catalyst, wherein said partial particulate filter captures less than 90% of the particulate matter in said exhaust gas stream;
- and
- c. wherein said small engine has a total engine displacement of less than 1-liter.
A method of treating exhaust gas stream emissions from a small diesel engine, said exhaust gas stream comprising nitrogen oxides (NOx) and particulate matter, said method comprising the steps of:
- a. providing an emission treatment system comprising an upstream oxidation catalyst, and a middle partial particulate filter section;
- and
- b. flowing said exhaust gas from said small diesel engine sequentially through said upstream oxidation catalyst, and said particulate filter, wherein said small diesel engine has a total engine displacement of less than 1-liter.
Dependencies are inferred from the claim text.