MUMBAI, India, July 31 -- Intellectual Property India has published a patent application (202647088731 A) filed by Mitsui Kinzoku Company, Limited on July 21, 2026, for Exhaust Gas Purification Catalyst.
Inventors include Asakoshi Toshiki; Nakamura Kouta; Watanabe Tokuya; and Iwakura Hironori.
The application for the patent was published on July 24, 2026, under issue no. 30/2026.
Abstract: The purpose of the present invention is to provide an exhaust gas purification catalyst capable of improving the exhaust gas purification performance of a Rh-containing layer and improving the exhaust gas purification performance of a portion below the Rh-containing layer. In order to achieve this purpose, provided is an exhaust gas purification catalyst (1) comprising: a substrate (10); a first catalyst layer (20) disposed on the substrate (10); a second catalyst layer (30) disposed on the first catalyst layer (20); and a third catalyst layer (40) disposed on the second catalyst layer (30), wherein the first catalyst layer (20) contains Pd, the second catalyst layer (30) contains Rh and Ce, the third catalyst layer (40) contains Rh, and Al and/or Zr, the content of Rh in terms of metal in the third catalyst layer (40) is greater than the content of Rh in terms of metal in the second catalyst layer (30), the content of Ce in terms of CeO2 in the second catalyst layer (30) is at least 7 mass%, the content of Ce in terms of CeO2 in the third catalyst layer (40) is less than 7 mass%, and the average thickness of the third catalyst layer (40) is 10 µm or less.
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