Macroporous carrier-free Sr-Ti catalyst for NOx storage and reduction

Por favor, use este identificador para citar o enlazar este ítem:
Información del item - Informació de l'item - Item information
Título: Macroporous carrier-free Sr-Ti catalyst for NOx storage and reduction
Autor/es: Alcalde-Santiago, Virginia | Davó-Quiñonero, Arantxa | Such-Basañez, Ion | Lozano Castelló, Dolores | Bueno López, Agustín
Grupo/s de investigación o GITE: Materiales Carbonosos y Medio Ambiente
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Química Inorgánica
Palabras clave: NOx | NSR | LNT | deNOx | Macroporous | Sr-Ti | Mixed oxide | Perovskite
Área/s de conocimiento: Química Inorgánica
Fecha de publicación: ene-2018
Editor: Elsevier
Cita bibliográfica: Applied Catalysis B: Environmental. 2018, 220: 524-532. doi:10.1016/j.apcatb.2017.08.062
Resumen: A novel concept is presented, consisting of a macroporous carrier-free catalyst. As a proof of concept, a novel Cu-containing Sr-Ti NSR catalyst with a macroporous network has been synthesized, and its maximum NOx storage capacity (1500 μmolNOx/gcatalyst) significantly surpasses that of conventional Pt/Ba/Al2O3 formulations (∼600–800 μmolNOx/gcatalyst). This high NOx storage capacity is achieved because the active phases (mainly SrCO3 and Cu-containing Sr-Ti perovskites, as deduced by XRD) are not diluted in an inert carrier, and this can be done because the macroporous structure obtained using a polymethylmethacrylate colloidal crystal template allows the access of gases to the particles bulk. In situ DRIFTS experiments showed that NOx were chemisorbed on the novel Cu-containing Sr-Ti macroporous catalyst as a mixture of nitrite and nitro species, and this suggests that several NOx chemisorption pathways are simultaneously taking place probably involving chemisorption of both NO and NO2. Additionally, this novel catalyst is totally selective towards N2 formation as NOx reduction product, without traces of N2O nor NH3. CO2 and H2O compete with NOx for being chemisorbed on the catalyst, and this hinders the utilization of this catalyst in real diesel exhausts. However, we believe that this new concept of macroporous carrier-free catalyst could be extended to other heterogeneous catalyzed reactions or materials to avoid the diluting effect of the catalyst support.
Patrocinador/es: Authors thank the financial support from Generalitat Valenciana (Project PROMETEOII/2014/010), Spanish Ministry of Economy and Competitiveness (Projects MAT2014-61992-EXP and CTQ2015-67597-C2-2-R), Spanish Ministry of Education, Culture and Sports (grant FPU14/01178) and EU (FEDER funding).
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2017.08.062
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2017 Elsevier B.V.
Revisión científica: si
Versión del editor:
Aparece en las colecciones:INV - MCMA - Artículos de Revistas

Archivos en este ítem:
Archivos en este ítem:
Archivo Descripción TamañoFormato 
Thumbnail2018_Alcalde_etal_ApplCatB_final.pdfVersión final (acceso restringido)3,29 MBAdobe PDFAbrir    Solicitar una copia
Thumbnail2018_Alcalde_etal_ApplCatB_accepted.pdfEmbargo 24 meses (acceso abierto: 25 ag. 2019)2,38 MBAdobe PDFAbrir    Solicitar una copia

Todos los documentos en RUA están protegidos por derechos de autor. Algunos derechos reservados.