Pt-based catalysts are commonly employed as NO-trapping catalysts for automobiles, while perovskite oxides have received attention as Pt-free NO-trapping catalysts. However, the NO storage performance of perovskite catalysts is significantly inferior at low temperatures and with coexisting gases such as HO, CO, and SO. This study demonstrates that NO storage reactions proceed over redox site (Mn, Fe, and Co)-doped SrTiO perovskites. Among the examined catalysts, Mn-doped SrTiO exhibited the highest NO storage capacity (NSC) and showed a high NSC even at a low temperature of 323 K. Moreover, the high NO storage performance of Mn-doped SrTiO was retained in the presence of poisoning gases (HO, CO, and SO). NO oxidation experiments revealed that the NSC of Co-doped SrTiO was dependent on the NO oxidation activity from NO to NO via lattice oxygen, which resulted in an inferior NSC at low temperatures. On the other hand, Mn-doped SrTiO successfully adsorbed NO molecules onto its surface at 323 K without the NO oxidation process using lattice oxygens. This unique adsorption behavior of Mn-doped SrTiO was concluded to be responsible for the high NSC in the presence of poisoning gases.
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