Kinetics and thermodynamics of organo-sulfur-compound desorption from saturated neutral activated alumina.

Autor: Feliciano RM; Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, 1101, Quezon City, Philippines., Ensano BMB; University Core Research Center for Disaster-free and Safe Ocean City Construction, Dong-A University, Busan, 49315, Korea., de Luna MDG; Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, 1101, Quezon City, Philippines. mgdeluna@up.edu.ph.; Department of Chemical Engineering, University of the Philippines Diliman, 1101, Quezon City, Philippines. mgdeluna@up.edu.ph., Futalan CM; Department of Environmental Science, Ateneo de Manila University, 1101, Quezon City, Philippines., Abarca RRM; Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, 1101, Quezon City, Philippines., Lu MC; Department of Environmental Engineering, National Chung Hsing University, 40227, Taichung, Taiwan. mmclu@nchu.edu.tw.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2022 Feb; Vol. 29 (9), pp. 12473-12483. Date of Electronic Publication: 2021 Apr 16.
DOI: 10.1007/s11356-021-13913-7
Abstrakt: Desulfurization of liquid fuels mitigates the amount of noxious sulfur oxides and particulates released during fuel combustion. Existing literature on oxidative-adsorptive desulfurization technologies focus on sulfur-in-fuel removal by various materials, but very little information is presented about their desorption kinetics and thermodynamics. Herein, we report for the first time, the mechanism of sulfur desorption from neutral activated alumina saturated with dibenzothiophene sulfone. Batch experiments were conducted to examine the effects of agitation rate, desorption temperature, sulfur content, and eluent type on sulfur desorption efficiencies. Results show enhanced desorption capacities at higher agitation rate, desorption temperature, and initial sulfur content. Desorption efficiency and capacity of acetone were found to be remarkably superior to ethanol, acetone:ethanol (1:1), and acetone:isopropanol (1:1). Desorption kinetics reveal excellent fit of the nonlinear pseudo-second-order equation on desorption data, indicating chemisorption as the rate-determining step. Results of the thermodynamics study show the spontaneous (ΔG° ≤ -2.08 kJ mol -1 ) and endothermic (ΔH° = 32.35 kJ mol -1 ) nature of sulfur desorption using acetone as eluent. Maximum regeneration efficiency was attained at 93% after washing the spent adsorbent with acetone followed by oven-drying. Scanning electron microscopy, Fourier transform infrared, and X-ray diffraction spectroscopy analyses reveal the intact and undamaged structure of neutral activated alumina even after adsorbent regeneration. Overall, the present work demonstrates the viability of neutral activated alumina as an efficient and reusable adsorbent for the removal of sulfur compounds from liquid fossil fuels.
(© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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