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US 8,283,281 B2Granted
Catalyst for purification of automobile exhaust gas and method for manufacturing the same
AssigneeKabushiki Kaisha Toyota Chuo Kenkyusho
InventorsTetsushi Ohmura, Akihiko Suda, Yoshihide Watanabe
Life of this patent
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Abstract
A catalyst for purification of automobile exhaust gas comprising: a support and rhodium supported on the support in an atomic state, wherein an amount of the rhodium supported is 0.05 to 0.30% by mass relative to the total amount of the support and the rhodium, 50 at. % or more of the rhodium is supported on the support as two-atom clusters of rhodium, and an average distance between adjacent ones of the two-atom clusters is 1.0 nm or more.
Claims16
A catalyst for purification of automobile exhaust gas, comprising:
- a support;
- and
- rhodium supported on the support in an atomic state, wherein
- an amount of the rhodium supported is 0.05 to 0.30% by mass relative to the total amount of the support and the rhodium,
- 50 at.% or more of the rhodium is supported on the support as two-atom clusters of rhodium, and
- an average distance between adjacent ones of the two-atom clusters is 1.0 nm or more.
3 more elements
A catalyst for purification of automobile exhaust gas, comprising:
- a support;
- and
- rhodium supported on the support in an atomic state, wherein
- an amount of the rhodium supported is 0.05 to 0.30% by mass relative to the total amount of the support and the rhodium,
- 50 at. % or more of the rhodium is supported on the support as two-atom clusters of rhodium,
- an average distance between adjacent ones of the two-atom clusters is 1.0 nm or more, and
- a first dispersion of rhodium which is determined on the basis of a first amount of CO adsorbed and the amount of the rhodium supported is 40 to 80%, the first amount of CO adsorbed being measured by a CO-pulse measurement method under a temperature condition of 50° C.
4 more elements
Dependencies are inferred from the claim text.