Catalytic converter

Patent metadata

Field	Value
Publication number	US-9782753-B2
Application number	US-201314767123-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Feb 13, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

Provide is a catalytic converter including a substrate which includes regions having different cell densities, in which exhaust gas purification performance is superior in all the regions of the substrate.
A catalytic converter 10 includes catalyst layers in which a noble metal catalyst is supported on a support in surfaces of cell walls 2 of a substrate 1 having a cell structure in a longitudinal direction of the substrate 1 in which gas flows, in which the substrate 1 has a first region 1 A having a relatively high cell density and a second region 1 B having a relatively low cell density, and a ratio of a thickness of a catalyst layer 3 A in the second region 1 B to a thickness of a catalyst layer 3 in the first region 1 A is in a range of more than 0.95 times and 1.2 times or less.

First claim

The invention claimed is:

1. A catalytic converter comprising:
a substrate having a cell structure in which gas flows; and
catalyst layers that contain a noble metal catalyst supported on a support and that are formed on surfaces of cell walls of the substrate along a longitudinal direction of the substrate,
wherein the substrate has a first region and a second region, the second region having a cell density lower than a cell density of the first region,
the catalyst layers include a first catalyst layer provided in the first region and a second catalyst layer provided in the second region, and
a ratio of a thickness of the second catalyst layer to a thickness of the first catalyst layer is 1.02 or more and 1.12 or less.

2. The catalytic converter according to claim 1 , wherein
the first region is a center region in a cross-section of the substrate, the cross-section being perpendicular to a direction in which the gas flows, and
the second region is a peripheral region in the cross-section of the substrate.

3. The catalytic converter according to claim 1 , wherein a pressure loss ratio of the catalytic converter is 1 or less and an emission ratio of the catalytic converter is 1 or less.

Assignees

• Toyota Motor Co Ltd

Inventors

• Aoki Yuki
• Suzuki Hiromasa
• Matsubara Hiroyuki

Classifications

• B01D53/9422

  for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR) · CPC title

• B01D2255/9032

  Two zones · CPC title

• B01J23/40

  of the platinum group metals · CPC title

• B01D2255/1023

  Palladium · CPC title

• F01N2330/06

  Ceramic, e.g. monoliths · CPC title