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AssigneesHitachi Metals, Ltd., Hino Motors, Ltd.
InventorsHirohisa Suwabe, Yasuhiko Otsubo, Shinya Tokumaru, Hiroshi Funabashi, Keiichi Nakagome, Makoto Tsujita, Hisaki Torisaka
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A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through the porous partition walls to remove particulates from the exhaust gas, the predetermined flow paths among the flow paths being sealed at their ends, a catalyst being carried by the porous partition walls, the porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 μm when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of the porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.7 or more, the Sn being represented by the following formula (1): Sn=−(Vn−Vn−1)/[log Dn−log (Dn−1)] (1), wherein Dn is a pore diameter (μm) at an n-th measurement point, Dn−1 is a pore diameter (μm) at an (n−1)-th measurement point, Vn is a cumulative pore volume (cm3/g) at an n-th measurement point, and Vn−1 is a cumulative pore volume (cm3/g) at an (n−1)-th measurement point.
A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through said porous partition walls to remove particulates from said exhaust gas, the predetermined flow paths among said flow paths being sealed at their ends, said porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 μm when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of said porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.7 or more, said Sn being represented by the following formula (1):
A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through said porous partition walls to remove particulates from said exhaust gas, the predetermined flow paths among said flow paths being sealed at their ends, flow paths near its outer peripheral wall being sealed by sealers at both ends, the length of said sealers from a filter end surface being 8.2% or less of the total length of said filter, and said flow paths having both ends sealed existing within a range of a radial length corresponding to 5 times the partition wall pitch at maximum from the outer periphery toward the center of said filter.
A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through said porous partition walls to remove particulates from said exhaust gas, the predetermined flow paths among said flow paths being sealed at their ends, a pitch of said porous partition walls being 2.54 mm or less, at least some of said sealers sealing flow paths except for those near its outer periphery wall projecting from the end surfaces of said partition walls by 0.01-5 mm in a flow path direction.
A ceramic honeycomb filter comprising a ceramic honeycomb structure having porous partition walls defining a plurality of flow paths for flowing an exhaust gas through said porous partition walls to remove particulates from said exhaust gas, the predetermined flow paths among said flow paths being sealed at their ends, a catalyst being carried by said porous partition walls, said porous partition walls having a porosity of 60-75% and an average pore diameter of 15-25 μm when measured according to a mercury penetration method, and the maximum of a slope Sn of a cumulative pore volume curve of said porous partition walls relative to a pore diameter obtained at an n-th measurement point being 0.7 or more, said Sn being represented by the following formula (1):
Dependencies are inferred from the claim text.