Fe2O3 supported on hollow micro/mesospheres silica for the catalytic partial oxidation of H2S to sulfur

A family of Fe-based catalysts supported hollow silica mesospheres has been synthesized and tested in the catalytic partial oxidation of H2S to elemental sulfur at 170-180 °C, atmospheric pressure and under 300 min of time-on-stream. The characterization of the synthesized catalysts by X-ray diffrac...

Full description

Saved in:
Bibliographic Details
Published in:Microporous and mesoporous materials 2020-03, Vol.294, p.109875, Article 109875
Main Authors: Cecilia, J.A., Soriano, M.D., Marques Correia, L., Rodríguez-Castellón, E., López-Nieto, J.M., Silveira Vieira, R.
Format: Article
Language:English
Subjects:
Elemental sulfur
Fe2O3
H2S
Hollow silica mesospheres
Selective oxidation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A family of Fe-based catalysts supported hollow silica mesospheres has been synthesized and tested in the catalytic partial oxidation of H2S to elemental sulfur at 170-180 °C, atmospheric pressure and under 300 min of time-on-stream. The characterization of the synthesized catalysts by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance UV–vis spectra (DRS), H2-termoprogrammed reduction (H2-TPR), N2 adsorption-desorption at −196 °C and X-ray photoelectron spectroscopy (XPS) reveals the formation of a catalytic system with high micro- and mesoporosity with high dispersion of the Fe2O3 species. The catalytic results reported high activity in the selective oxidation of H2S, reaching a highest conversion value close to 94% with a selectivity towards elemental sulfur of 98% after 300 min of time on stream (TOS) at 180 °C for the HMS-10Fe catalyst. The comparison of Fe-containing HMS (10 wt% of iron loading) with other SiO2-based supports, as a fumed silica (Cab-osil) or a mesoporous silica (SBA-15), presents different H2S conversion values, following the next trend: HMS-10Fe > SBA-10Fe > Cab-10Fe. These results suggest that the use of a support with a narrow pore tend to facilitate the iron dispersion favoring higher conversion rates. [Display omitted] •Hollow mesospheres silicas (HMS) have synthesized as support.•HMS have been used to disperse Fe2O3 species.•Fe2O3–SiO2 are high activity in the partial oxidation of H2S.•Fe2O3–SiO2 are high selective to elemental sulfur.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2019.109875