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| Home > Publications database > Influence of H2O/HCl/H2S containing gas mixtures on condensation behavior of the trace metals lead and cadmium under gasification-like conditions |
| Journal Article | FZJ-2021-02738 |
; ; ;
2021
Science Direct
New York, NY [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.fuproc.2021.106887
Abstract: In order to achieve an environmentally friendly treatment of growing municipal solid waste, gasification technology as a good candidate gains increasing attention and will play a vital role in the processes of waste-to-energy. In this study, the condensation behavior of trace metals Pb and Cd, especially in HCl/H2S containing gas mixtures was investigated under lab-scale gasification conditions. It was found that PbO was a completely predominant condensation species in atmospheres containing H2O or HCl while regarding Cd condensation under identical conditions metallic Cd prevails. It was also observed that the presence of 125 ppmv HCl caused a significant shift of the condensation of PbO from 790 to 670 °C. In the presence of H2S, the condensation as sulfides, i.e. PbS and CdS occurred overwhelmingly. A mechanism for the condensation of PbS was proposed, with which an interesting phenomenon was illuminated that the condensation of PbS moves to higher temperatures as the H2S concentration increases from 125 to 250 ppmv, while it shifts towards lower temperatures with a further concentration increase to 500 ppmv. In addition, the difference in condensation mechanism for Cd and Pb was compared and discussed.
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