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

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Title: Macroporous carrier-free Sr-Ti catalyst for NOx storage and reduction
Authors: Alcalde-Santiago, Virginia | Davó-Quiñonero, Arantxa | Such-Basañez, Ion | Lozano Castelló, Dolores | Bueno López, Agustín
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica
Keywords: NOx | NSR | LNT | deNOx | Macroporous | Sr-Ti | Mixed oxide | Perovskite
Knowledge Area: Química Inorgánica
Issue Date: Jan-2018
Publisher: Elsevier
Citation: Applied Catalysis B: Environmental. 2018, 220: 524-532. doi:10.1016/j.apcatb.2017.08.062
Abstract: 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.
Sponsor: 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
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 Elsevier B.V.
Peer Review: si
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