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

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 In with 100% CO conversion at 20 degrees C. The results show that after the pretreatment in N-2 at 750 degrees C and reduction in H-2 at 300 degrees C, the interaction between Pd and CeO2 was enhanced, and smaller Pd particles and longer interface length (l(0)) 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 Pd reacts with the oxygen species activated by the oxygen vacancy. The Pd 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 l(0) x B-TOF. (C) 2017 Published by Elsevier B.V.