We present an application of Raman spectroscopy for understanding the chemisorption catalytic processes occurred in impregnated activated carbon used in hydrogen sulfide (H S) adsorption from biogas. Downstream of an H S adsorption 2 2 capacity study, conducted employing commercial carbon at different operating conditions as sorbent in a fixed bed flow reac - tor, spent carbon samples who returned suitable H S removal performances were studied by means of Raman spectroscopy. Raman analysis showed that among all the H S metal impregnates, copper was the chemical responsible for H S adsorption, 2 2 since observed Raman spectra exhibited a perfect overlapping with copper sulfide (CuS) signature. A further confirmation was given by a thermal decomposition test conducted through the Raman optical apparatus over an H S-exposed carbon sample, by estimating anti-Stokes and Stokes Raman processes relative efficiency. Raman results turned out to be consistent with thermogravimetry tests results executed over the same spent carbon samples. The experiment witnesses the capability of Raman spectroscopy to determinate the chemical nature of compounds resulting from H S adsorption, overcoming the lack in chemical information encountered by elemental techniques such as energy-dispersive X-ray. We thus propose Raman spectroscopy as a way to
International Journal of Environmental Science and Technology – Springer Journals
Published: Jun 4, 2018
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