High-sulfur capacity and regenerable Zn-based sorbents derived from layered double hydroxide for hot coal gas desulfurization

Wu, Mengmeng; Chang, Bingwei; Lim, Teik−Thye; Oh, Wen−Da; Lei, Junxi; Mi, Jie

doi:10.1016/j.jhazmat.2018.08.015

Cited by 35 publications

(27 citation statements)

References 39 publications

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“…In recent years, various desulfurizers have been widely explored to capture H 2 S with the participation of oxygen in a relatively wide temperature region. , Transition metal oxides and rare earth oxides loaded on various porous materials show a satisfactory desulfurization performance at medium and high temperatures. , However, the performance of these sorbents drops rapidly to less than 50 mg/g in the absence of oxygen gas. − In fact, it is recognized that metal oxide sorbents act as catalysts in capturing hydrogen sulfide with the presence of oxygen gas. , Moreover, a large number of studies have also proved that the desulfurization performance of sorbents under dry conditions is much lower than that in the presence of water vapor. , As reported, the presence of water in the desulfurization system has a positive effect, which has been proven to enhance the hydrolysis of H 2 S . In general, there is a lack of research on selective desulfurization under the conditions of low temperature, dry, and anaerobic, which is an urgent problem to be solved in metallurgy and chemical industries.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Highly Efficient and Selective Removal of H₂S over Three-Dimensional Zn–Cu-Based Materials in an Anaerobic Environment

Liang

Peng

Liu

et al. 2020

Environ. Sci. Technol.

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In this study, novel three-dimensional ribbon-like composite materials have been introduced for selectively capturing H 2 S in a low-temperature dry anaerobic environment. First, a ribbonlike basic copper carbonate precursor with Zn doping supported on the activated semicoke (ASC) was successfully synthesized in situ by a two-step hydrothermal method for the first time. The porous Zn− Cu materials obtained after calcination were applied as a sorbent to remove H 2 S under anaerobic conditions at a low temperature. Effects of the heat treatment temperature, Cu loading content, and Zn doping content on the anaerobic desulfurization performance of Zndoped CuO x /ASC sorbents were investigated. The optimal Zndoped CuO x /ASC sorbent showed a satisfactory activity and selectivity to capture H 2 S efficiently with a breakthrough capacity of 126 mg/g. Further mechanism study demonstrates that the super desulfurization performance of this sorbent is mainly attributed to abundant pore distribution, the synergistic effect between copper and zinc, the extensive surface active oxygen, and so forth.

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Section: Introductionmentioning

confidence: 99%

Low-Temperature Highly Efficient and Selective Removal of H₂S over Three-Dimensional Zn–Cu-Based Materials in an Anaerobic Environment

Liang

Peng

Liu

et al. 2020

Environ. Sci. Technol.

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“…As far as supported sorbents are concerned, an interesting approach is to utilize the mesoporous silica materials such as MCM-41 to support the Zn-based sorbents [ 11 , 12 , 13 ]. The formation of the mixed oxide—ZnSiO 4 —has been observed, with little influence on the performance of the material, however.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Support on the Properties of Zinc Oxide Based Sorbents

et al. 2021

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We present the comparative analysis of three Zn-based sorbents for the process of sulphur removal from hot coal gas. The sorbents were prepared by a slurry impregnation of TiO2, SiO2 and Al2O3, resulting in complex, multiphase materials, with the dominant phases of Zn2TiO4, Zn2SiO4 and ZnAl2O4, respectively. We have analyzed the effect of supports on the phase composition, texture, reducibility and H2S sorption. We have found that the phase composition significantly influences the susceptibility of the investigated materials to reduction by hydrogen. Zn2TiO4 have been found to be the easiest to reduce which correlates with its ability to adsorb the largest amount of hydrogen sulphide—up to 4.2 gS/100 g—compared to the other sorbents, which absorb up to 2.2 gS/100 g. In the case of Zn2SiO4 and ZnAl2O4, this effect also correlates with reducibility—these sorbents have been found to be highly resistant to reduction by hydrogen and to absorb much less hydrogen sulphide. In addition, the capacity of ZnAl2O4 for H2S adsorption decreases in the subsequent work cycles—from 2.2 gS/100 g in the first cycle to 0.8 gS/100 g in the third one. Computational analysis on the DFT level has shown that these materials show different thermodynamic stability of sulphur sites within the unit cells of the sorbents. For Zn2TiO4 and Zn2SiO4, the adsorption is favorable in both the first and second layers of the former and only the top layer of the latter, while for zinc aluminate it is not favorable, which is consistent with the experimental findings.

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“…x(OH)2(A )x/n•mH2O, M 2+ and M 3+ correspond to (Ni 2+ , Co 2+ , Cu 2+ , Mg 2+ , Mn 2+ ) and (Al 3+ , V 3+ , Fe 3+ , Cr 3+ ) metal cations, respectively, A nrepresents the interlayer anion (NO3 , CO3 , OH ), x = M 3+ /(M 2+ + M 3+ ) is the surface charge [1,2], have evoked great attraction on the basis of their well-defined and high redox activity, and environmentally friendly nature. They have been employed in several processes such as oxygen evolution reaction [3,4], hydrogen evolution reaction [5], corrosion protection [6], hot coal gas desulfurization [7], supercapacitors [8,9] and so on. Among all the above mentioned applications, the development of high performance supercapacitors represents a very active area of research.…”

Section: Introductionmentioning

confidence: 99%

NiMnCr layered double hydroxide-carbon spheres modified Ni foam: An efficient positive electrode for hybrid supercapacitors

Addad

Dolci

et al. 2020

Chemical Engineering Journal

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New electrode composite materials consisting of NiMnCr Layered Double Hydroxides (LDHs) coated on carbon spheres (CS) supported on nickel foam (NiMnCr LDHs@CS/NF) were synthesized using a two step hydrothermal process. The obtained binder-free NiMnCr LDHs@CS/NF composite was investigated as a positive electrode for supercapacitors and achieved a high specific capacity of 569 C g -1 at 3 A g -1 ; this value was ~6.5 times that of CS/NF (87.9 C g -1 at 3 A g -1 ) and ~3.3 times that of NiMnCr LDHs/NF composite (173.2 C g -1 at 3 A g -1 ). The NiMnCr LDHs@CS/NF composite retained ~76% of its original capacity after 10000 cycles, much better than ~54% achieved by NiMnCr LDHs/NF composite, suggesting good reversibility and stability. Furthermore, a hybrid supercapacitor was fabricated using NiMnCr LDHs@CS/NF as the positive electrode and FeOOH nanorods deposited on NF (FeOOH/NF) as the negative electrode. The hybrid supercapacitor displayed an energy density of 48 Wh kg -1 at a power density of 402.7 W kg -1 . A home-designed windmill device was successfully driven by the as-fabricated supercapacitor device for about 25 s. Additionally, two as-fabricated hybrid supercapacitor cells in series were used to light up a yellow LED and a red LED in parallel for ~111 s and ~343 s, respectively. Taken together, these results indicate that the developed electrodes hold a promising potential in energy storage application.

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High-sulfur capacity and regenerable Zn-based sorbents derived from layered double hydroxide for hot coal gas desulfurization

Cited by 35 publications

References 39 publications

Low-Temperature Highly Efficient and Selective Removal of H₂S over Three-Dimensional Zn–Cu-Based Materials in an Anaerobic Environment

Low-Temperature Highly Efficient and Selective Removal of H₂S over Three-Dimensional Zn–Cu-Based Materials in an Anaerobic Environment

Effect of a Support on the Properties of Zinc Oxide Based Sorbents

NiMnCr layered double hydroxide-carbon spheres modified Ni foam: An efficient positive electrode for hybrid supercapacitors

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High-sulfur capacity and regenerable Zn-based sorbents derived from layered double hydroxide for hot coal gas desulfurization

Cited by 35 publications

References 39 publications

Low-Temperature Highly Efficient and Selective Removal of H2S over Three-Dimensional Zn–Cu-Based Materials in an Anaerobic Environment

Low-Temperature Highly Efficient and Selective Removal of H2S over Three-Dimensional Zn–Cu-Based Materials in an Anaerobic Environment

Effect of a Support on the Properties of Zinc Oxide Based Sorbents

NiMnCr layered double hydroxide-carbon spheres modified Ni foam: An efficient positive electrode for hybrid supercapacitors

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Product

Resources

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Low-Temperature Highly Efficient and Selective Removal of H₂S over Three-Dimensional Zn–Cu-Based Materials in an Anaerobic Environment

Low-Temperature Highly Efficient and Selective Removal of H₂S over Three-Dimensional Zn–Cu-Based Materials in an Anaerobic Environment