García Aguilar, Jaime, Miguel García, Izaskun, Berenguer-Murcia, Ángel, Cazorla-Amorós, Diego
Synthesis of Robust Hierarchical Silica Monoliths by Surface-Mediated Solution/Precipitation Reactions over Different Scales: Designing Capillary Microreactors for Environmental Applications
ACS Applied Materials & Interfaces. 2014, 6(24): 22506-22518. doi:10.1021/am506595c
URI: http://hdl.handle.net/10045/44748
DOI: 10.1021/am506595c
ISSN: 1944-8244 (Print)
Abstract: 
A synthetic procedure to prepare novel materials (surface-mediated fillings) based on robust hierarchical monoliths is reported. The methodology includes the deposition of a (micro- or mesoporous) silica thin film on the support followed by growth of a porous monolithic SiO2 structure. It has been demonstrated that this synthesis is viable for supports of different chemical nature with different inner diameters without shrinkage of the silica filling. The formation mechanism of the surface-mediated fillings is based on a solution/precipitation process and the anchoring of the silica filling to the deposited thin film. The interaction between the two SiO2 structures (monolith and thin film) depends on the porosity of the thin film and yields composite materials with different mechanical stability. By this procedure, capillary microreactors have been prepared and have been proved to be highly active and selective in the total and preferential oxidation of carbon monoxide (TOxCO and PrOxCO).
Keywords:Hierarchical silica monoliths, Silica thin film, Surface mediated fillings, Solution/precipitation reactions, CO oxidation, Capillary microreactors
American Chemical Society
info:eu-repo/semantics/article