Pretreatment Impact On The Morphology And The Catalytic Performance Of Hybrid Heterodimers Nanoparticles Applied To Co Oxidation

Abstract

In this work, we applied seeded growth colloidal method to produce Au-FexOy dumbbells nanoparticles (DBNPs). The colloidal DBNPs were characterized and deposited on SiO2 to evaluate the effect of Au-FexOy interface on the catalytic activity in CO oxidation (CO+1/2O(2) -> CO2). In particular, we addressed the impact of redox pretreatments in the catalytic activity. Catalytic data showed that the catalyst was not very active after the first oxygen activation but after a reduction step there was a substantial increase in the catalyst activity. A detail characterization showed that DBNPs suffered great morphological and structural changes with the formation of core/shell Au-FexOy structures, in which the FexOy shells were irregular and presented lower crystallinity. The results suggest that the increase in catalytic activity was related to the formation of a more extended Au-FexOy interface after the pretreatments, thereby increasing the amount of active sites. (C) 2016 Elsevier B.V. All rights reserved.

In this work, we applied seeded growth colloidal method to produce Au-FexOydumbbells nanoparticles (DBNPs). The colloidal DBNPs were characterized and deposited on SiO2to evaluate the effect of Au-FexOyinterface on the catalytic activity in CO oxidation (