Considering the importance of high-temperature removal of H2S from industrial gases, sorption
studies were carried out on copper oxide and Cu−V and Cu−Mo mixed oxides in the absence
and presence of hydrogen in a fixed-bed reactor. Experiments were carried out in a wide
temperature range between 300 and 700 °C. A significant amount of SO2 was produced with
CuO sorbent in the absence of hydrogen. In the case of mixed oxide sorbents, SO2 formation
was detected even in the presence of hydrogen. On the basis of the experimental concentration
profiles of H2S, SO2, and H2O measured in the reactor effluent and XRD results for the solid
products, reaction sequences were proposed in reducing (in hydrogen) and nonreducing
atmospheres. A deactivation model proposed for such noncatalytic gas−solid reactions gave
excellent predictions of the H2S breakthrough curves. Sorption rate parameters obtained in the
absence of hydrogen were found to be larger than the corresponding values in the presence of
hydrogen. Partial reduction of CuO prior to the sorption of H2S in the presence of hydrogen is
the major reason for this observation.
Effective diffusivities and adsorption equilibrium constants of methanol, ethanol and 2-methyl-2-butene (2M2B), in Amberlyst 15, were evaluated from batch adsorption experiments. Moment expressions derived for different models involving diffusion resistances in the macropores and within the gel-like micrograins were used for the evaluation of effective diffusion coefficients. Contribution of surface diffusion to diffusion flux within the macropores was found to be quite significant. Also, it was found that diffusion resistance in liquid filled macropores was much more significant than diffusion resistance within the gel-like micrograins of Amberlyst 15., for methanol, ethanol and 2M2B.
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