Synthesis and structural characterization of nanometric ceria highly dispersed in SBA-15 with oxygen exchange capacity

Juliana Martins de Souza e Silva, Mathias Strauss, Camila Marchetti Maroneze, Ernesto Rezende Souza, Yoshitaka Gushikem, Fernando Aparecido Sigoli, Italo Odone Mazali
2011 Journal of Materials Chemistry  
Nanometric ceria-decorated SBA-15 was prepared using a route involving the impregnation of SBA-15 pores by a solution of cerium(III) 2-ethylhexanoate, followed by its thermal decomposition. According to XRF analysis, the number of successive impregnation-decomposition cycles (IDC) allows control of the CeO 2 /SiO 2 ratio in the final material, and also the tailoring of the nanoparticle size of the fluorite CeO 2 nanoparticles supported in the SBA-15, as confirmed by XRD, Raman and UV-Vis
more » ... scopies. The mean pore size of the SBA-15 decreases with successive IDC, as observed by N 2 adsorption-desorption, suggesting that CeO 2 nanoparticles are located inside the SBA-15 mesopores, as confirmed by TEM and HRTEM analyses. The degree of oxygen storage capacity (OSC) was measured by the number of hydrogen uptake from the temperature programmed reduction (H 2 -TPR). It was found that the value of hydrogen uptake of SBA-15 submitted to one IDC corresponds to 3344 mmol of O 2 per gram of CeO 2 , whereas those of SBA-15 submitted to five and ten IDC were 1324 and 2769 mmol of O 2 per gram of CeO 2 , respectively.
doi:10.1039/c1jm11476j fatcat:nkgwe64xeza27eqh22qkt7tq5u