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The new shape ceria-based support material for a lean NOx trap catalyst (LNT) was developed and its catalytic characteristics were investigated. It has a unique shape that each fine particle of raw material is formed into hollow sphere. Samples of platinum loaded powder catalysts were obtained with either the hollow sphere ceria-based material or two kinds of the conventional shape one, and their catalytic activities were evaluated with the synthetic gas. The aged powder catalyst using the hollow sphere ceria-based material had higher CO oxidation performance at low temperature as compared to the conventional shape one with the same composition. The characterization results indicated that the hollow sphere ceria-based material had high thermal stability.