Diesel particulate filters having a washcoat that improves filter performance
US8980187B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 2011 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Oct 16, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49345
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Aspects of the invention include Diesel Particulate Filters (DPF) that include a layer of inert particles some of which are in contact with a catalyst and are associated with the surface of the filter. Particles associated with the inlet side of the filter are sized such that they coat portions of the inlet surface and portions of the channels that connect the inlet surface to the wall separating the inlet surface from the outlet surface. In some aspects the particles comprise alumina of between about 1.0 microns to about 40.0 microns and colloidal alumina particles that are between about 1.0 nm to about 10.0 nm. The coating is applied by contacting the filter body especially the inlet channels of the filter body with a washout that includes the different sized particles and at least one catalyst that facilitates the conversion of soot particles into gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.