Exhaust Gas Purifying Catalyst and Catalyst Body using the Same
AssigneeCataler Corporation
InventorsEriko Tanaka, Toshiki Tani, Shunsuke Oishi, Hiromi Togashi, Masanao Sato
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Abstract
An exhaust gas purifying catalyst whose oxidation activity after long exposure to high temperature is improved is provided. The exhaust gas purifying catalyst disclosed herein includes a parent material including an alumina particle and zirconia that covers at least a part of a surface of the alumina particle, and a catalyst precious metal carried by the parent material and containing at least Pt. The average particle diameter of the zirconia that is obtained by a focused ion beam scanning electron microscope is 50 nm or less. The mole ratio (ZrO2/Pt) of the zirconia to the Pt is 8 or more.
Claims14
An exhaust gas purifying catalyst comprising:
- a parent material including an alumina particle and zirconia that covers at least a part of a surface of the alumina particle;
- and
- a catalyst precious metal carried by the parent material and containing at least Pt, wherein
- an average particle diameter of the zirconia that is obtained by a focused ion beam scanning electron microscope is 50 nm or less, and
- a mole ratio (ZrO2/Pt) of the zirconia to the Pt is 8 or more.
Dependencies are inferred from the claim text.