Plasma-reconstructed LaMnO3 nanonetwork supported palladium catalyst for methane catalytic combustion

Abstract

Tuning the metal-support interaction is an effective strategy for improved catalytic performance in catalytic combustion of methane. Herein, we prepared Pd/LaMnO3 catalysts using two types of LaMnO3, that were achieved by plasma treatment or traditional thermal treatment respectively. Contrast to the LaMnO3 (LMO-T) support, the plasma-treated LaMnO3 (LMO-P) support has large surface specific area, porosity and many surface defects. Among these catalysts, the Pd supported on plasma-treated LaMnO3 (Pd/LMO-P) shows the best catalytic activity (T90 = 471 °C) and the lowest Ea value (74 kJ/mol). It reveals that the high performance should be attributed to the large surface area, surface-rich active species and strong metal-support interaction. The XPS techniques also demonstrated that the plasma-treated could boost the electron transfer between PdOx and LaMnO3, improving the redox properties. Moreover, the plasma-treated catalyst exhibits an excellent performance under thermal and water-vapor coexistence environment. The superior performance can arouse interest for the design of advanced catalyst in environmental catalysis.