Honeycomb filter system

Details Honeycomb filter system Honeycomb filter system

2011-07-05

2011-07-05

Smith, Duane (Department: 1776)

Gas separation

Two or more separators

C055S523000, C055SDIG030, C060S311000, C422S177000

Reexamination Certificate

active

07972400

ABSTRACT:
A honeycomb filter system comprising a first honeycomb filter disposed upstream: first filter having partition wall matrix of a mean pore diameter of 25 μm or more and below 70 μm and a porosity of 40% or more and below 70%, and carrying an oxidation catalyst containing at least one material selected from the group consisting of platinum (Pt), palladium, ceria, and alumina in at least a part of inner surfaces of pores of the matrix; and a second honeycomb filter disposed downstream; having a surface layer of a peak pore diameter of 0.3 μm or more and below 20 μm which is equivalent to or smaller than that of its matrix, and a porosity of 60% or more and below 95% which is higher than that of the matrix; and having the other specified relations.

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Apr. 19, 2011 Extended European Search Report issued in European Application No. 08251409.2, 2011.

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