2024-03-28T21:27:46Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/243562022-05-04T07:46:24Zcom_10261_78com_10261_3com_10261_101com_10261_5col_10261_331col_10261_354
00925njm 22002777a 4500
dc
Portela, Raquel
author
Suárez Gil, Silvia
author
Rasmussen, Soren B.
author
Arconada, Noemí
author
Castro Martín, Yolanda
author
Durán, Alicia
author
Ávila García, Pedro
author
Coronado, Juan M.
author
Sánchez, Benigno
author
2010-04-15
The 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.
Catalysis Today 151(1-2): 64-70 (2010)
0920-5861
http://hdl.handle.net/10261/24356
10.1016/j.cattod.2010.03.056
http://dx.doi.org/10.13039/100012818
Hydrogen sulphide
Photocatalysis
Adsorption
Selectivity
Regeneration
Photocatalytic-based strategies for H2S elimination