Journal
CARBON
Volume 169, Issue -, Pages 327-337Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.07.075
Keywords
ZnFe2O4; Porous support; Reactive adsorption; Catalytic oxidation; H2S removal
Funding
- China Scholarship Council [201906930015]
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Wood-, coal-, and coconut-based activated carbons and ordered mesoporous silica (SBA-15) were selected as supports to synthesize bifunctional ZnFe2O4 adsorbents for an H2S removal from air under ambient conditions. The effects of supports on active phase nanoparticle features and on the efficiency of the H2S removal were investigated. The collected results showed the differences in the composition, morphology and dispersion of the active phase. The carbon supports demonstrated superiority over SBA-15 owing to their electron-rich matrix, abundance of surface defects and the ability to catalyze H2S oxidation. In the case of silica, strong interactions between ZnFe2O4 and SBA-15 leading to the formation of Me-O-Si (Me=Zn, Fe) bonds inactivated metal ions, which was demonstrated in an inferior performance in the H2S removal. The results also indicated that the differences in the graphitization degree, microporosity, and surface pH of the carbon supports result in remarkable differences in the adsorbents efficiency for the H2S removal. This study provides new insights for the rational fabrication of efficient metal oxides-based adsorbents and for a full utilization of their reactive adsorption capability in a nanoscale range. (C) 2020 Elsevier Ltd. All rights reserved.
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