CATALYST FOR PURIFYING EXHAUST GASES AND METHOD OF EVALUATING LOW-TEMPERATURE PURIFYING ABILITY OF THE SAME

摘要

A catalyst for purifying exhaust gases comprises a support comprising at lea st an oxide comprising cerium and a catalytic ingredient loaded on the support, and exhibits a value of an oxygen sorbing amount with respect to a heat capacity, an oxygen sorbing amount/heat capacity value falling in a range of from 4 X 10-3to 8 X 10-3 (g .cndot. J-1 .cndot. K). When the oxygen sorbing amount/heat capacity value is in the range, the catalyst is excellent in ter ms of the low-temperature purifying ability.