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Refractory exhaust filtering method and apparatus

  • US 7,566,426 B2
  • Filed: 04/30/2007
  • Issued: 07/28/2009
  • Est. Priority Date: 11/07/2005
  • Status: Expired due to Fees
First Claim
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1. A method for cleaning an exhaust stream of an internal combustion engine comprising:

  • directing the exhaust stream into a set of inlet channels of a honeycomb substrate in a wall-flow configuration, the inlet channels of the honeycomb substrate having a porous structure comprising substantially fibrous non-woven porous walls comprising tangled ceramic fibers having interconnecting bonds;

    trapping particulates in the inlet channel using the porous structure while directing the exhaust gas through the porous structure;

    reacting the exhaust gas with at least one reactive reagent to convert it into a different species using pore diffusion within the porous structure;

    receiving the exhaust gas into an outlet channel of the honeycomb substrate, the outlet channel being adjacent to an inlet channel and separated by the porous structure; and

    directing the exhaust stream into the atmosphere from the outlet channel.

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