Study of Large OSC Materials (Ln2O2SO4) on the Basis of Sulfur Redox Reaction

Three-way catalyst shows high performance under stoichiometric atmosphere. The CeO₂-ZrO₂ based materials (CZ) are added as a buffer of O₂ concentration. To improve the catalyst performance the larger O₂ storage capacity (OSC) are needed. Theoretically, the sulfur oxidation-reduction reaction moves oxygen 8 times larger than cerium. We focused on this phenomenon and synthesized Ln₂O₂SO₄ as a new OSC material. The experimental result under model gas shows that the OSC of Ln₂O₂SO₄ is 5 times lager than CZ.