English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/24356
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Photocatalytic-based strategies for H2S elimination

AutorPortela, Raquel ; Suárez Gil, Silvia ; Rasmussen, Soren B.; Arconada, Noemí; Castro Martín, Yolanda; Durán, Alicia ; Ávila García, Pedro ; Coronado, Juan M.; Sánchez, Benigno
Palabras claveHydrogen sulphide
Fecha de publicación15-abr-2010
CitaciónCatalysis Today 151(1-2): 64-70 (2010)
ResumenThe mechanism of H2S elimination in gas phase by means of heterogeneous photocatalysis was investigated. The main drawbacks for a real application were identified to be related to the nature of the reaction products: SO2 is toxic, corrosive and malodorous, and SO4 2− accumulates on the photocatalyst surface leading to deactivation. In order to face this challenge, supported photocatalysts with different properties were synthesised to investigate several strategies according to the photocatalyst selectivity. On one hand, two different approaches for coupling adsorption and photocatalysis have been proposed to solve the problem of SO2 release and prolong the catalyst lifetime. First, porous and SO2-selective photocatalysts were synthesised by sol–gel with the help of surfactants. These materials presented good conversion values and suffered slower deactivation; an external adsorption unit might retain the SO2 produced. Alternatively, improved adsorption capability of the photocatalyst was obtained through the synthesis of coated and incorporated hybrid TiO2–SiMgOx composites, whereby SO2 release was avoided and the lifetime of the photocatalyst prolonged. The combination in a hybrid material of an efficient photocatalyst and an adsorbent that may act as support constitutes a promising alternative for H2S elimination due to the coupling of photocatalytic and adsorptive properties. On the other hand, photocatalyst regeneration was achieved by rising with water, which recovered the active sites. Moreover, when a 1M KOH solution was used in the process, the creation of new basic active sites resulted in an increase of the photocatalytic activity, even higher than for the fresh material.
Versión del editorhttp://dx.doi.org/10.1016/j.cattod.2010.03.056
Aparece en las colecciones: (ICV) Artículos
(ICP) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.