期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 49, 期 3, 页码 369-376出版社
ELSEVIER
DOI: 10.1016/j.supflu.2009.03.011
关键词
Palladium; Inverse opals; Supercritical fluids; Aerogels; Catalyst; Nanomaterials
资金
- MEC (Spain) [CTQ2006-07172, MAT2007-65711]
- Universidad Complutense de Madrid (UCM) [Santander-UCM PR34/07-15789]
- CAM (Spain) [CCG08-UCM/MAT-4247]
- MEC
Pd-SiO2 aerogel inverse opals were prepared for the first time using supercritical CO2 (scCO(2)). Colloidal crystals formed by 3D-arrays of monodisperse spherical polymer particles (opals) were used as templates. In one approach, a pre-made large surface area SiO2 aerogel inverse opal prepared in scCO(2) was impregnated with palladium hexafluoroacetylacetonate [Pd(hfaC)(2)] in scCO(2) and thermally treated to get Pd-SiO2. In another approach, tetraethylorthosilicate and Pd(hfaC)(2) dissolved in scCO(2) reacted directly on the polymeric template in one step. Both, impregnation and reaction experiments were carried out at 40 degrees C and 85 bar. After the removal of template, large surface area porous materials replicating the structure of the original template were obtained (inverse opals). These materials presented hierarchical porosity with ordered macropores of mesoporous walls. Palladium (between 1 and 3 mol% by EDX) was incorporated uniformly throughout the SiO2 matrix forming small clusters (by TEM). The effect of Pd incorporation on the aerogel porosity was studied. (C) 2009 Elsevier B.V. All rights reserved.
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