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To know the surface morphology, the sorbent was characterized by SEM and shown in Fig. 4b.
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Morphology of the sorbent, temperature, space velocity and H2S feed concentration were initially evaluated.
The purpose of this work is to study the adsorption of H2S from gas streams containing He and CH4 with an emphasis on the influence of the sorbent morphology on the process of adsorption.
In general, it appears that SO2 impedes CO2 capture, leading to a negligible CO2 capture capacity after only few cycles regardless of how the sorbent morphology is modified, which suggests any method designed to improve sorbent performance for CO2 capture will not be proof against significant SO2 concentrations in flue gas.
The results obtained showed significant decrease of sorbent surface area after pretreatment and the presence of smooth CaO grains was typical of the sorbent particle surface morphology.
Pristine and used sorbents were characterized by scanning electron microscopy-energy dispersion spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy to identify the morphology, elemental and vibration analysis of the sorbent before and after the experiments.
Surface morphology and energy dispersive X-ray spectroscopy revealed that the sorbent was capable of encaging uranium from aqueous solution.
The sorbent can then be recycled, and the CO2 compressed into liquid form for removal.
The gas is released when the sorbent returns to room temperature.
Lackner's team says it has made a significant breakthrough that massively reduces the amount of energy required to recharge the sorbent.
The efficiency of this process depends on the surface area of the sorbent, and an easy way to increase the surface area is to spray a liquid sorbent into the air as a fine mist.
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