US 11,731,111 B2
Porous ceramic structure and method of producing porous ceramic structure
Yunie Izumi, Nisshin (JP); Kennichi Hidaka, Nagoya (JP); and Akihiro Miura, Nagoya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK INSULATORS, LTD., Nagoya (JP)
Filed on Mar. 15, 2021, as Appl. No. 17/201,329.
Claims priority of application No. 2020-057682 (JP), filed on Mar. 27, 2020.
Prior Publication US 2021/0299641 A1, Sep. 30, 2021
Int. Cl. B01J 23/889 (2006.01); B01J 23/10 (2006.01); B01J 23/75 (2006.01); B01J 23/00 (2006.01); B01J 35/04 (2006.01); B01J 35/00 (2006.01); B01J 35/02 (2006.01); B01J 37/04 (2006.01); B01J 37/00 (2006.01); B01J 37/08 (2006.01); B01D 53/94 (2006.01); F01N 3/022 (2006.01); B01J 21/04 (2006.01)
CPC B01J 23/8892 (2013.01) [B01D 53/94 (2013.01); B01J 21/04 (2013.01); B01J 23/005 (2013.01); B01J 23/10 (2013.01); B01J 23/75 (2013.01); B01J 35/0013 (2013.01); B01J 35/026 (2013.01); B01J 35/04 (2013.01); B01J 37/0009 (2013.01); B01J 37/04 (2013.01); B01J 37/088 (2013.01); F01N 3/022 (2013.01); B01D 2255/2065 (2013.01); B01D 2255/2073 (2013.01); B01D 2255/20738 (2013.01); B01D 2255/20746 (2013.01); B01D 2255/20792 (2013.01); B01D 2255/405 (2013.01); B01D 2255/9155 (2013.01); B01D 2255/9202 (2013.01); F01N 2330/06 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A porous ceramic structure comprising:
a porous structure body composed primarily of cordierite;
cerium-containing particles fixedly attached to said structure body; and
metal oxide particles containing at least one of iron, manganese, and cobalt and each fixedly attached to an inside of a pore in said structure body,
wherein said metal oxide particles include:
a fixedly attached portion located inside said structure body; and
a protrusion contiguous with said fixedly attached portion and protruding into said pore,
when said porous ceramic structure contains iron, an iron content is higher than or equal to 0.1 mass % and lower than or equal to 3.0 mass % in terms of Fe2O3,
when said porous ceramic structure contains manganese, a manganese content is higher than or equal to 0.1 mass % and lower than or equal to 3.0 mass % in terms of Mn2O3,
when said porous ceramic structure contains cobalt together with iron or manganese, a cobalt content is higher than or equal to 0.1 mass % and lower than or equal to 3.0 mass % in terms of Co3O4,
when said porous ceramic structure contains cobalt without containing iron and manganese, a cobalt content is higher than or equal to 0.2 mass % and lower than or equal to 6.0 mass % in terms of Co3O4,
a cerium content is higher than or equal to 0.1 mass % and lower than or equal to 10 mass % in terms of CeO2,
a ratio of a sum of the iron content in terms of Fe2O3, the manganese content in terms of Mn2O3, and the cobalt content in terms of Co3O4 to the cerium content in terms of CeO2 is higher than or equal to 0.8 and lower than or equal to 9.5, and
said porous ceramic structure contains more than or equal to 0.03 percent and less than or equal to 2.5 percent by mass of zinc in terms of ZnO.