Kinetic and Thermodynamic Study of the Wet Desulfurization Reaction of ZnO Sorbents at High Temperatures

Erwin Ciro, Alessandro Dell’Era (), Arda Hatunoglu, Enrico Bocci and Luca Del Zotto ()
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Erwin Ciro: Department of Engineering Sciences, Università degli Studi Guglielmo Marconi, 00193 Rome, Italy
Alessandro Dell’Era: Department of Basic and Applied Science for Engineering, Sapienza University of Rome, 00161 Rome, Italy
Arda Hatunoglu: Department of Engineering Sciences, Università degli Studi Guglielmo Marconi, 00193 Rome, Italy
Enrico Bocci: Department of Engineering Sciences, Università degli Studi Guglielmo Marconi, 00193 Rome, Italy
Luca Del Zotto: Centro di Ricerca su Energia, Ambiente e Territorio, Università Telematica eCampus, 22060 Novedrate, Italy

Energies, 2023, vol. 16, issue 2, 1-20

Abstract: Hot gas conditioning is a remarkable stage for decreasing typical and harsh contaminants of syngas produced in the biomass gasification process. Downstream contaminants containing hydrogen sulphide (H 2 S) can significantly deteriorate fuel stream conversion reactors and fuel cell systems. Thus, an effective gas cleaning stage is required to remove critical streams that endanger the whole pathway toward the biomass conversion process. In this work, we studied H 2 S capture from biofuel syngas by using a kinetic deactivation model to analyze the effect of the operating conditions on the adsorption performance. Furthermore, the particle sorbent influence on other reactions, such as methane reforming and water gas shift (WGS), were also evaluated. Breakthrough curves were plotted and fitted following a first-order linearized deactivation model to perform both the H 2 S adsorption capacity and thermodynamic analysis. Moreover, the influence of the operating conditions was studied through a breakthrough curve simulation. By using the Arrhenius and Eyring–Polanyi expressions, it was possible to calculate the activation energy and some thermodynamic parameters from the transition state theory. Finally, a mathematical analysis was performed to obtain the diffusion coefficient ( D ) and the kinetic reaction constant ( k ¯ 0 ) of H 2 S gas within ZnO particles, considering a spherical geometry.

Keywords: desulfurization; deactivation model; ZnO sorbent; thermodynamic analysis; hot gas conditioning; breakthrough curves (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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