Abstract
Ceria-supported vanadium catalysts were studied for H2S removal via partial and selective oxidation reactions at low temperature. The catalysts were characterized by N2 adsorption at 77 K, Raman spectroscopy, X-ray diffraction techniques, and X-ray fluorescence analysis. X-ray diffraction and Raman analysis showed a good dispersion of the V-species on the support. A preliminary screening of these samples was performed at fixed temperature (T = 327 °C) and H2S inlet concentration (10 vol%) in order to study the catalytic performance in terms of H2S conversion and SO2 selectivity. For the catalyst that exhibited the higher removal efficiency of H2S (92%) together with a lower SO2 selectivity (4%), the influence of temperature (307–370 °C), contact time (0.6–1 s), and H2S inlet concentration (6–15 vol%) was investigated.
Highlights
Hydrogen sulfide (H2 S) is a common gas pollutant, which is harmful to human health with deleterious effects on many industrial catalysts, and represents the main source of acid rains when it is oxidized to sulfur dioxide (SO2 ) [1]
The H2 S selective oxidation reaction to sulfur and water was investigated over vanadium-sulfide-based catalysts supported on CeO2
From the preliminary screening of the catalysts performed at 327 ◦ C, the higher catalytic activity was observed over the 2.55 V-CeO2 and 20 V-CeO2 catalysts, with H2 S
Summary
Hydrogen sulfide (H2 S) is a common gas pollutant, which is harmful to human health with deleterious effects on many industrial catalysts, and represents the main source of acid rains when it is oxidized to sulfur dioxide (SO2 ) [1]. H2 S-removal-based processes include wet scrubbing [2], biological methods [3], adsorption [4], and selective catalytic oxidation [5]. Among these purification processes, selective catalytic oxidation seems to be very promising for lean-H2 S gas streams, where the concentration of hydrogen sulfide is in the range 0.1–10 vol%. The selective catalytic oxidation of H2 S into elemental sulfur is one of the treatment methods employed for the removal of H2 S from the Claus process tail gas [7,8]. Vanadium oxides have been investigated as active phases for H2 S selective oxidation and are used as bulk V2 O5 [13], mixed with other metals [14], or supported over commercial [15] and mesoporous materials [16]
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