Abstract
First promoted by Daihatsu Motor Co. as an ‘intelligent catalyst’ [1], the ‘self-regenerative catalyst’ is
an automotive catalyst in which the precious metal (e.g. Pt, Pd, Rh) supposedly dissolves into a carefully
chosen perovskite oxide support upon oxidation, and re-disperses as metallic particles upon reduction;
cyclical redox conditions that are already present in gasoline engine exhaust due to the fuel injection
control system. This is counter to the behavior of metal particles on most supports, that irreversibly
coarsen during redox cycling. Though the mechanistics of such a system are of great interest to the
catalyst community, the authors of the original report (and subsequent studies) utilized only bulk
characterization techniques (e.g. EXAFS, XANES) to analyze the average structure, and thus they did
not satisfactorily probe the local environment of the metal particles and/or ions
