In:
Environmental Progress & Sustainable Energy, Wiley
Abstract:
Realizing the use of biogas as fuel or a gas engine, it is needed to upgrade to natural gas standards when it comes to pure biomethane, meaning impurities must be removed to a certain low concentration. Among these tasks, hydrogen sulfide (H 2 S) removal steadfastly gets the most attention. In the present work, partial catalytic oxidation was used to convert H 2 S to less harmful forms. Adsorbents/catalysts applied to this process were prepared from the sludge of a groundwater treatment plant using a simple combination of drying and calcination methods. As a relevant result, the as‐prepared sample (dried at 105°C for 24 h) exhibited high activity, with 90 ± 2% H 2 S conversion after 120 min of reaction time, while the sample calcined at about 500°C for 5 h (TP‐500) showed the highest H 2 S conversion (96 ± 2%); the lowest 28 ± 1% belonged to the case of TP‐700. The main compositions of the TP‐500 sample were crystalline calcite and amorphous iron oxides. The average size of calcite crystallites was ~45 nm, with a specific surface area of ~76 m 2 /g. Moreover, the presence of oxygen in the catalytic process and the “self‐outflow process” of sulfur desorption were the vital keys that allowed the partial H 2 S oxidation to take place continuously. After a reaction time of 2 h, the adsorption capacity of the best sample was 460.8 mg/g. Thus, it is obvious that inexpensive catalysts derived from sludge precursors can be effectively used for H 2 S removal from mixtures with air, supporting the treatment of raw biogas in the coming time.
Type of Medium:
Online Resource
ISSN:
1944-7442
,
1944-7450
Language:
English
Publisher:
Wiley
Publication Date:
2024
detail.hit.zdb_id:
2462324-6
SSG:
21
