Boundary role of Nano-Pd catalyst supported on ceria and the approach of promoting the boundary effect

Abstract Recently, the interface catalysis has caused more and more attentions. Herein, we developed an approach to strengthen the boundary role of Pd/CeO2 catalyst, resulting in an obvious increase in its catalytic performance for CO oxidatio n with 100% CO conversion at 20 °C. The results show that after the pretreatment in N2 at 750 °C and reduction in H2 at 300 °C, the interaction between Pd and CeO2 was enhanced, and smaller Pd0 particles and longer interface length (I0) of Pd-CeO2 were obtained. In the boundary of Pd-CeO2, the presence of Pd2+ promotes the formation of oxygen vacancies in CeO2, and CO adsorbed on Pd0 reacts with the oxygen species activated by the oxygen vacancy. The Pd0 sites and oxygen vacancies in the boundary play a decisive role in the CO oxidation over Pd/CeO2, which is proved by the B-TOF and I0 × B-TOF.