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/CeO 2 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 N 2 at 750 °C and reduction in H 2 at 300 °C, the interaction between Pd and CeO 2 was enhanced, and smaller Pd 0 particles and longer interface length (I 0 ) of Pd-CeO 2 were obtained. In the boundary of Pd-CeO 2 , the presence of Pd 2+ promotes the formation of oxygen vacancies in CeO 2 , and CO adsorbed on Pd 0 reacts with the oxygen species activated by the oxygen vacancy. The Pd 0 sites and oxygen vacancies in the boundary play a decisive role in the CO oxidation over Pd/CeO 2 , which is proved by the B-TOF and I 0  × B-TOF.