Calcium-based regenerable sorbents for high temperature H 2 S removal

Sulfur, and in particular, H 2 S removal is of significant importance in gas cleaning processes in different applications, including biogas production and biomass gasification. H 2 S removal with metal oxides is one of the most viable alternatives to achieve deep desulfurization. This process is usually conducted in a packed bed configuration in order to provide a high solid surface area in contact with the gas stream per unit of volume. The operating temperature of the process could be as low as room temperature, which is the case in biogas production plants or as high as 900 ∘ C suitable for gasification processes. Depending on the operating temperature and the cleaning requirement, different metal oxides can be used including oxides of Ca, Fe, Cu, Mn and Zn. In this review, the criteria for the design and scale-up of a packed bed units are reviewed and simple relations allowing for quick assessment of process designs and experimental data are presented. Furthermore, modeling methods for the numerical simulation of a packed bed adsorber are discussed.

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“…Not fully regenerable due to formation of calcium sulfate [79]. 50% capacity loss after 3 cycles due to sintering [80].…”

Section: Caomentioning

confidence: 99%

Removal of Hydrogen Sulfide with Metal Oxides in Packed Bed Reactors—A Review from a Modeling Perspective with Practical Implications

Sadegh-Vaziri

Bäbler

2019

Applied Sciences

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“…Calciumbased sorbents have been reported to be promising for high-temperature desulfurization, for either in situ or downstream use [5]. However, the most applied Ca-based materials are minerals like dolomite or limestone, which are unsupported and, thus, contain more active material per total mass unit [30][31][32][33].…”

Section: Residual Sulfur Concentrations On Ca-based Sorbentmentioning

confidence: 99%

Regenerable Sorbents for High‐Temperature Desulfurization of Syngas from Biomass Gasification

Mahmoodinia

Rout

et al. 2021

Chemie Ingenieur Technik

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Single-metal high-temperature solid sorbents for syngas cleaning using Mn, Ca, Fe, Cu, or Mo supported on g-Al 2 O 3 were synthesized, characterized, and tested in a fixed-bed reactor. H 2 S and SO 2 concentrations in the gas after treatment at T = 400 to 700°C were compared with thermodynamic calculations. The Mn-based sorbent showed the best ability to achieve a low sulfur residual in the gas, especially at temperatures above 600°C. Sorbents with Fe, Cu, and Mo gave SO 2 formation in the initial phase, but this could be avoided by a pre-reduction treatment of the sorbent material.

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“…Several models have been developed to represent the different non-catalytic solid-gas reaction; however, the most popular used to describe the sulfation of solid sorbents are based on the shrinking core process [28][29][30][31][32][33]. In this model, it is considered that a first-order chemical reaction between the SO 2 and the calcium core of a spherical particle happens first in the outside surface of the particle forming CaSO 3 /CaSO 4 .…”

Section: Kinetics Parameter Estimationmentioning

confidence: 99%

Desulfurization of Flue Gases Using Materials Based on Ca(OH)2 Supported on Clays

Flores

Rodas

Uscanga

et al. 2018

AJOCS

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This work was carried out in collaboration between all authors. Author RF designed the study, supervised the preparation of sorbent materials and TG analysis, performed the statistical analysis and wrote the first draft of the manuscript. Author AR supervised the preparation of sorbent materials and TG analysis and performed the statistical analysis. Authors DU and CAD prepared the sorbent materials, performed the characterization and TG analysis and estimated the kinetics parameters. All authors read and approved the final manuscript.

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Calcium-based regenerable sorbents for high temperature H 2 S removal

Cited by 39 publications

References 28 publications

Removal of Hydrogen Sulfide with Metal Oxides in Packed Bed Reactors—A Review from a Modeling Perspective with Practical Implications

Removal of Hydrogen Sulfide with Metal Oxides in Packed Bed Reactors—A Review from a Modeling Perspective with Practical Implications

Regenerable Sorbents for High‐Temperature Desulfurization of Syngas from Biomass Gasification

Desulfurization of Flue Gases Using Materials Based on Ca(OH)2 Supported on Clays

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