Title:
EXHAUST GAS CLEANING CATALYST, EXHAUST GAS CLEANING METHOD, AND EXHAUST GAS CLEANING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/179679
Kind Code:
A1
Abstract:
Provided is an exhaust gas cleaning catalyst capable of inhibiting the grain growth of particulates. An exhaust gas cleaning catalyst of the present invention includes composite metal particulates containing Pd and Rh, wherein the average proportion of the total number of Rh atoms relative to the total number of Pd and Rh atoms is 0.5 atom% to 6.5 atom%, and, given an X-ray wavelength of 1.5403 Å, when XRD analysis is carried out under the condition that the diffraction surface is the crystal lattice face of the Pd (111), and diffraction angles 2θ indicating the positions of the diffraction peaks on the diffraction surface are identified, the absolute value of the difference between the theoretical lattice constant B calculated from a formula related to Vegard's law using the identified values, and the actual lattice constant C calculated from a formula related to lattice constants and Bragg's law does not exceed 1.020×10-3 (Å). A smaller absolute value of the difference between the theoretical lattice constant B and the actual lattice constant C is associated with a higher degree to which the Pd and Rh are combined with one another.
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Inventors:
SHIRAKAWA SHOGO (JP)
MIURA MASAHIDE (JP)
IKAI TOSHIHIRO (JP)
IIZUKA KOSUKE (JP)
NIHASHI HIROKI (JP)
NAITO ISAO (JP)
NAGATA TAKAHIRO (JP)
MIURA MASAHIDE (JP)
IKAI TOSHIHIRO (JP)
IIZUKA KOSUKE (JP)
NIHASHI HIROKI (JP)
NAITO ISAO (JP)
NAGATA TAKAHIRO (JP)
Application Number:
PCT/JP2017/015205
Publication Date:
October 19, 2017
Filing Date:
April 13, 2017
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
CATALER CORP (JP)
CATALER CORP (JP)
International Classes:
B01J23/63; B01D53/94; F01N3/10
Domestic Patent References:
| WO2014119749A1 | 2014-08-07 |
Foreign References:
| JP2010022892A | 2010-02-04 | |||
| JPH0290947A | 1990-03-30 | |||
| JPH09215922A | 1997-08-19 | |||
| JPH1176819A | 1999-03-23 |
Other References:
GONZALEZ-VELASCO, J. R. ET AL.: "Comparative three-way behaviour of Pt, Pd and Rh single and combined phases in a full gas mixture with oscillating feedstream", STUDIES IN SURFACE SCIENCE AND CATALYSIS, vol. 116, 1998, pages 73 - 82, XP055430165, ISSN: 0167-2991
VEDYAGIN, ALEKSEY A. ET AL.: "Catalytic Purification of Exhaust Gases Over Pd-Rh Alloy Catalysts", TOPICS IN CATALYSIS, vol. 56, 30 May 2013 (2013-05-30), pages 1008 - 1014, XP055370080, ISSN: 1572-9028
See also references of EP 3444030A4
VEDYAGIN, ALEKSEY A. ET AL.: "Catalytic Purification of Exhaust Gases Over Pd-Rh Alloy Catalysts", TOPICS IN CATALYSIS, vol. 56, 30 May 2013 (2013-05-30), pages 1008 - 1014, XP055370080, ISSN: 1572-9028
See also references of EP 3444030A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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