Authors: Dardouri, R; Yerga, RMN; Mota, N; Albela, B; Bonneviot, L; Zina, MS

New J. Chem.. vol: 44. page: 1144-0546.
Date: JAN 21. 2020.
Doi: 10.1039/c9nj04554f.

Palladium oxide nanoparticles of 9 nm stabilized on TiOx subnano-islets (SNI) in monodispersed mesoporous silica nanospheres (MSN) having a stellate morphology are found to be very active for methane combustion. The characterization at various steps of the catalysts elaboration was performed using a panel of techniques including transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-visble reflectance spectroscopy. The catalytic performances were measured from methane combustion light-off experiments showing a remarkably low temperature light-off (T-10% similar to 200 degrees C) of these particles in comparison to PdO nanophase on 2D TiOx anchors (T-10% similar to 280 degrees C) or those obtained without TiOx anchors (T-10% similar to 350 degrees C). The surprising performance of these new catalysts is attributed to a combination of parameters along with the stellate pore morphology likely favorable for high conversion and a diffusion-controlled regime..