| Abstract
| - Considering the importance of high-temperature removal of H2S from industrial gases, sorptionstudies were carried out on copper oxide and Cu−V and Cu−Mo mixed oxides in the absenceand presence of hydrogen in a fixed-bed reactor. Experiments were carried out in a widetemperature range between 300 and 700 °C. A significant amount of SO2 was produced withCuO sorbent in the absence of hydrogen. In the case of mixed oxide sorbents, SO2 formationwas detected even in the presence of hydrogen. On the basis of the experimental concentrationprofiles of H2S, SO2, and H2O measured in the reactor effluent and XRD results for the solidproducts, reaction sequences were proposed in reducing (in hydrogen) and nonreducingatmospheres. A deactivation model proposed for such noncatalytic gas−solid reactions gaveexcellent predictions of the H2S breakthrough curves. Sorption rate parameters obtained in theabsence of hydrogen were found to be larger than the corresponding values in the presence ofhydrogen. Partial reduction of CuO prior to the sorption of H2S in the presence of hydrogen isthe major reason for this observation.
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