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Materials (Basel). 2018 Aug 30;11(9). pii: E1562. doi: 10.3390/ma11091562.

Selective Oxidation of Hydrogen Sulfide to Sulfur Using Vanadium Oxide Supported on Porous Clay Heterostructures (PCHs) Formed by Pillars Silica, Silica-Zirconia or Silica-Titania.

Author information

1
Departamento Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Unidad Asociada al ICP-CSIC, Universidad de Málaga, 29071 Málaga, Spain. jacecilia@uma.es.
2
Instituto de Tecnología Química, UPV-CSIC, Campus Universidad Politécnica de Valencia, Avenida de los Naranjos s/n, 46022 Valencia, Spain. mdosorod@itq.upv.es.
3
Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal. alejandro.natoli@gmail.com.
4
Departamento Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Unidad Asociada al ICP-CSIC, Universidad de Málaga, 29071 Málaga, Spain. castellon@uma.es.
5
Instituto de Tecnología Química, UPV-CSIC, Campus Universidad Politécnica de Valencia, Avenida de los Naranjos s/n, 46022 Valencia, Spain. jmlopez@itq.upv.es.

Abstract

Vanadium oxide (V₂O₅) species has been supported on different porous clay heterostructures (with silica pillars, silica-zirconia with a molar ratio Si/Zr = 5 and silica-titania with a molar ratio Si/Ti = 5) by wetness incipient method. All catalysts were characterized by X-ray diffraction (XRD), N₂ adsorption-desorption at -196 °C, NH₃ thermoprogrammed desorption (NH₃-TPD), Raman spectroscopy, diffuse reflectance UV-Vis and X-ray photoelectron spectroscopy (XPS). After that, the catalytic activity of the vanadium-based catalysts was evaluated in the selective oxidation of H₂S to elemental sulfur. The catalytic data show that both the activity and the catalytic stability increase with the vanadium content, obtaining the highest conversion values and sulfur yield for the catalysts with vanadium content of 16 wt.%. The comparison among all supports reveals that the incorporation of TiO₂ species in the pillars of the PCH improves the resistance to the deactivation, attaining as best results a H₂S conversion of 89% for SiTi-PCH-16V catalyst and elemental sulfur is the only compound detected by gas chromatography.

KEYWORDS:

H2S selective oxidation; PCH; V2O5; porous clay heterostructure; sulfur elemental

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