Tuning SMSI to stabilize metallic Pd species: A case study on Pd/TiO2 for HCHO oxidation

Pretreatment of the carrier for supported catalysts can effectively improve the strong metal-support interaction (SMSI) and increase the dispersion of precious metals, which are critical to many important catalytic reactions. In this work, we tuned SMSI on Pd/TiO2 catalysts through inducing surface defects of TiO2 by pretreated with different atmospheres (H2 /N2 , N2 , O2 /N2 ) at the high temperature (800 degrees C). Multiple characterization results illustrated that surface defects anchored Pd species and thus enhanced their dispersion. During reduction, Ti3 + species formed and transferred onto the metallic Pd species and then induced SMSI, which effectively stabilize Pd species in the metallic state. The stronger MSI, the more stability of Pd species. As a case, Pd/TiO2 -800H2 , with strongest MSI, displayed the best HCHO oxidation performance at low temperature (10 degrees C). (c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.