A catalyst for use in purifying exhaust gas from an internal combustion
engine. The active components of an exhaust gas purification catalyst for
an internal combustion engine tend to be melted or softened and then to
move outside the carrier, because the components become in contact with
exhaust gas at a high temperature. Hence, anchoring materials are
provided between carriers in order to suppress the moving of
catalytically active components. Anchoring materials 22 do not form
compounds with catalytically active components 24, and are selected from
substances that do not melt even in contact with exhaust gas at a high
temperature. When the active components contain sodium, potassium,
cesium, lithium, strontium, barium, noble metals and the like, the best
anchoring material is MgO. The anchoring material functions as a barrier
that prevents the moving of active components.