Catalyst
A catalyst for exhaust gas purification having superior exhaust gas purification performance is provided. Disclosed is a catalyst containing, as a catalyst support, a composite phosphate containing yttrium and phosphorus and having a composition ratio of yttrium to phosphorus (Y/P) of greater than 1 as a molar ratio.
1. A catalyst comprising, as a catalyst support, a composite phosphate containing yttrium and phosphorus and having a composition ratio of yttrium to phosphorus of greater than 1 as a molar ratio,
wherein said composite phosphate comprises at least Y 3 PO 7 or Y 8 P 2 O 17 .
2. A catalyst comprising a noble metal supported on a catalyst support formed from the composite phosphate of claim 1 .
3. The catalyst according to claim 2 , wherein the noble metal is rhodium.
4. The catalyst according to claim 1 , having an action of converting carbon monoxide to carbon dioxide.
5. The catalyst according to claim 1 , wherein the catalyst is used for purification of automobile exhaust gas.