公开(公告)号：US20210197175A1

公开(公告)日：2021-07-01

申请号：US17088767

申请日：2020-11-04

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA ,  CATALER CORPORATION

Inventor： Takahiro NISHIO ,  Shogo SHIRAKAWA ,  Masahide MIURA ,  Isao CHINZEI ,  Seiji NAKAHIGASHI ,  Norimichi SHIMANO ,  Hiromi TOGASHI ,  Hiroki NIHASHI ,  Mitsuyoshi OKADA ,  Takashi ONOZUKA ,  Souta AKIYAMA ,  Isao NAITO

IPC: B01J23/46 ,  B01J23/42 ,  B01J23/44

Abstract: The present disclosure relates to an exhaust gas control catalyst including a base and a catalyst coating layer having a two-layer structure on the base. The catalyst coating layer includes a lower layer on the base, and an upper layer on the lower layer. The upper layer of the catalyst coating layer contains Rh particles in which a mean particle diameter measured by observation using a transmission electron microscope is 1.0 nm or more and 2.0 nm or less and a particle-diameter standard deviation σ is 0.8 nm or less. A length of the upper layer from an end face on a downstream side in an exhaust gas flow direction falls within a range of 70% or more and 100% or less of a total length of the base.

公开(公告)号：US20230201770A1

公开(公告)日：2023-06-29

申请号：US17925982

申请日：2021-06-08

Applicant: CATALER CORPORATION

Inventor： Toshio YAMAMOTO ,  Akira MORIKAWA ,  Satoru KATOH ,  Masahide MIURA ,  Nobusuke KABASHIMA ,  Nobuyuki TAKAGI ,  Takashi ONOZUKA ,  Mitsuyoshi OKADA

IPC: B01D53/94 ,  B01J23/40 ,  B01J23/63 ,  B01J35/02 ,  B01J35/10 ,  B01J37/00 ,  B01J37/02 ,  F01N3/28

CPC classification number: B01D53/9413 ,  B01J23/40 ,  B01J23/63 ,  B01J35/023 ,  B01J35/1076 ,  B01J35/108 ,  B01J37/0018 ,  B01J37/0036 ,  B01J37/0215 ,  B01J37/0228 ,  B01J37/0248 ,  F01N3/28 ,  B01D2255/1025 ,  B01D2255/2061 ,  B01D2255/2063 ,  B01D2255/20715 ,  B01D2255/2092 ,  B01D2255/407 ,  B01D2255/9202 ,  B01D2255/9205

Abstract: A catalyst for purification of exhaust gas including a substrate, and a catalyst coat layer which is formed on a surface of the substrate and contains catalyst particles, wherein the catalyst coat layer has an average thickness ranging 25 to 150 μm, a void fraction, as determined by scanning electron microscope observation of a cross-section of the catalyst coat layer, ranging 1.5 to 8.0% by volume, 60 to 90% by volume of all voids in the catalyst coat layer are high-aspect ratio pores which have equivalent circle diameters ranging 2 to 50 μm in a cross-sectional image of a cross-section of the catalyst coat layer perpendicular to a flow direction of exhaust gas in the substrate, and which ratios of 5 or higher, the high-aspect ratio pores have an average aspect ratio ranging 10 to 50, and a noble metal is supported on the entire catalyst coat layer.

公开(公告)号：US20190136730A1

公开(公告)日：2019-05-09

申请号：US16307345

申请日：2017-06-05

Applicant: CATALER CORPORATION

Inventor： Takashi ONOZUKA ,  Kyosuke MURAKAMI ,  Kenichi TAKI

IPC: F01N3/10 ,  B01J23/63 ,  B01J37/02

Abstract: The exhaust gas purification catalyst according to the present invention includes a substrate 10 and a catalyst coat layer 30. The catalyst coat layer 30 is formed into a multilayer structure having a lower layer 32, a middle layer 34 and an upper layer 36. The upper layer 36 contains Rh and a Ce-containing oxide. The lower layer 32 contains Pd and a Ce-containing oxide. The middle layer 34 is a Ce-free layer that contains Pd but does not contain a Ce-containing oxide. A ratio (B/A) of the content B of Ce in the lower layer 32 to the content A of Ce in the upper layer 36 satisfies 2≤(B/A).