Effect of Microporous Layer On Sintering and Dispersion of Pt

The prevention of sintering is one of the most desired goals in the catalyst industries since its effects are hard to be reversed, leading to huge economic losses. In this paper we analyze the effect of a microporous layer on the sintering of platinum dispersed in silica. This layer was made via molecular layer deposition (MLD) with trimethylaluminum, ethanolamine and maleic anhydride, which after calcination creates a porous layer with an average pore size of 0.8 nm. We studied two cases. In the first case the platinum was dispersed on the silica first, followed by coating with the MLD process. In the second case the platinum was dispersed after the porous layer was created. In both cases the particles were annealed at different temperatures to determine the effect of the coating in the sintering of the platinum. CO oxidation was used to monitor the active life of the catalyst as well.