Use of Retorted Shale as Sulfur Adsorbent

Abstract:

The aim of this work is to use a residue from shale gas production, known as retorted shale (RS), as an alternative material for processes of sulfur adsorptive desulfurization in liquid fuels such as gasoline or diesel. Therefore, retorted shale samples were chemically modified. Two methods were applied: acid leaching and impregnation. The first method (RS-HCl) was an acid treatment with HCl solution (3M) in proportion of 1.5: 10. The second method (RS-Fe) was a wet impregnation of 20%wt. of Fe followed by calcination at 700°C for 2 h. The adsorbents were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The adsorption tests were performed using a solution of n-heptane and thiophene to simulate a fuel with an initial concentration of 500 ppm of sulfur. The results showed that both methods significantly altered the structure of the retorted shale, mainly the amount of Fe₂O₃. The adsorption test results indicated that the adsorbents prepared can remove up to 90% of the sulfur present.

• Periodical: Materials Science Forum (Volume 930)
• Pages: 562-567
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.930.562
• Online since: September 2018
• Authors: Rodolfo Luiz Bezerra de Araújo Medeiros, Maria de Fátima Dantas e Silva, Rodrigo César Santiago, Gilvan Pereira de Figueredo, Heloísa Pimenta de Macedo, Marcus Antônio de Freitas Melo, Dulce Maria de Araújo Melo
• Keywords: Fe₂O₃, HCl, Retorted Shale, Sulfur, Thiophene, Wet Impregnation

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