VOCs abatement using thick eggshell Pt/SBA-15 pellets with hierarchical porosity

Usón, Laura (Universidad de Zaragoza) ; Colmenares, María Gracia ; Hueso, José L. ; Sebastián, Víctor (Universidad de Zaragoza) ; Balas, Francisco (Universidad de Zaragoza) ; Arruebo, Manuel (Universidad de Zaragoza) ; Santamaría, Jesús (Universidad de Zaragoza)

Resumen: Mechanically stable 3-D pellets made of mesoporous SBA-15 silica fibers containing highly dispersedplatinum nanoparticles have been successfully synthesized with the aid of a sacrificial polyacrylamidenetwork using a gel-casting deposition technique. The pellets exhibit a hierarchical porosity, with spacesof 3 microns among the silica fibers, and a core–shell distribution of Pt, with an outer Pt-rich layer of 450microns accounting for over 73% of the Pt. Both factors (hierarchical structure and concentration of thecatalyst on the outer pellet surface) facilitated reactant access to the catalyst centers, and as a consequencean excellent catalytic activity toward the total oxidation of n-hexane, used as a VOC model. There was nomeasurable loss of activity after 70 h on stream and the subsequent examination of the catalyst revealedthat interparticle coalescence of Pt nanoparticles was largely prevented due to the encapsulation of thenoble-metal particles within the silica mesochannels.

Idioma: Inglés

DOI: 10.1016/j.cattod.2013.08.014

Año: 2014

Publicado en: Catalysis Today 227 (2014), 179-186
ISSN: 0920-5861

Factor impacto JCR: 3.893 (2014)

Categ. JCR: CHEMISTRY, APPLIED rank: 6 / 72 = 0.083 (2014) - Q1 - T1
Categ. JCR: ENGINEERING, CHEMICAL rank: 11 / 135 = 0.081 (2014) - Q1 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 37 / 138 = 0.268 (2014) - Q2 - T1

Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2011-24988

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)