Insights into the effects of metal-ion doping on the structure and hot-coal-gas desulfurization properties of Zn-based sorbents supported on SBA-15

Li, Qiaochun; Wang, Xiaowen; Zhang, Ran; Mi, Jie; Wu, Mengmeng

doi:10.1016/j.fuel.2022.123198

Cited by 17 publications

(4 citation statements)

References 40 publications

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“…More importantly, Co is beneficial for the desulfurization reaction in thermodynamics and the acceleration of surface reaction kinetics, even though the sulfur capacity of Co per unit is lower than that of Zn. Previous studies also confirmed the positive effect of Co on the distribution of ZnO nanograins as well as the adsorption of H 2 S. − It is found that increased Co concentration is beneficial for the reduction in particle size because Co 2+ is an alternative to Zn 2+ and the ionic radius of Co 2+ is lower than that of Zn 2+ and a reduced nucleation rate of the composited metal oxides. , A similar phenomenon has also been observed and discussed. ,, Yang et al concluded that the coexistence of Zn and Co in the sorbents could significantly enhance the H 2 S removal performance. The enhanced sulfur capacity is attributed to the enlarged specific surface area and decreased nanograin size.…”

Section: Resultsmentioning

confidence: 61%

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Zhang

et al. 2022

Environ. Sci. Technol.

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Desulfurization sorbent with a high active component utilization is of importance for the removal of H 2 S from coal gas at high temperatures. Thus, the hypothesis for producing Zn x Co 3−x O 4 /carbon nanofiber sorbents via the combinations of electrospinning, in situ hydrothermal growth, and carbonization technique has been rationally constructed in this study. Zn x Co 3−x O 4 nanoparticles derived from metal−organic frameworks are uniformly loaded on the electrospun carbon nanofibers (CNFs) with high dispersion. Zn x Co 3−x O 4 /CNFs sorbents possess the highest breakthrough sulfur adsorption capacity (12.4 g S/100 g sorbent) and an excellent utilization rate of the active component (83.2%). The excellent performance of Zn x Co 3−x O 4 /CNFs can be attributed to the synergetic effect of the hierarchical structure and widely distributed Zn x Co 3−x O 4 on the CNFs supporter. The decomposition of Zn/Co−ZIFs not only generates the nucleus of oxides but also realizes their physical isolation through the formation of carbon grids on the surface of CNFs, avoiding the aggregation of oxides. Furthermore, Zn x Co 3−x O 4 /CNFs sorbents show an overwhelming superiority over the ZnO/CNFs sorbent, which is attributed to the introduction of Co and then the promotion of the stability of Zn at high temperatures. The presence of Co also accelerates the adsorption of H 2 S on the active site of the oxide surface. The presented method is beneficial for promoting desulfurization performances and producing sorbents with high utilization of active components.

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Section: Resultsmentioning

confidence: 61%

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Zhang

et al. 2022

Environ. Sci. Technol.

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“…The structural variations between sorbents before and after desulfurization were mainly attributed to the fact that O 2in manganese oxide was replaced by S 2in H 2 S during desulfurization, which increased the size of active components and thus blocked meso-pores into micro-pores, and this is why the specific surface area increased and pore size decreased from 6.336 to 3.949 nm in the meantime. 54 TEM analysis was also performed to observe the morphology changes of (Zn, Mn)S/24PCNFs. The particle size of desulfurization products was found to be in range of 9.1-23.0 nm, which was increased as compared to that of fresh sorbent due to the fact that the MnS and ZnS are much larger than MnO x and ZnO in molecular size (Figure . 4f and g).…”

Section: Resultsmentioning

confidence: 99%

Porous Carbon Nanofibers Supported Zn@MnOx Sorbents with High Dispersion and Loading for Hot Coal Gas Desulfurization

Lai

Ye²,

Zhang³

et al. 2022

Preprint

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Sorbent with a great quantity of highly dispersed active components is of importance to achieve excellent desulfurization performance. Thus, Zn@MnOx/porous carbon nanofibers (PCNFs) sorbents have been constructed via electrospinning, carbonization, activation and hydrothermal techniques in this study. The as-prepared sorbent realizes a sulfur capacity of 9.63 g S 100 g-1 sorbent and a utilization rate 117% of ZnO, which could be attributed to the synergetic effects of the enlarged surface area of PCNFs and uniformly distributed active components. The specific surface area of modified PCNFs is nearly five times higher than that of the pristine CNFs, providing larger loading area and more attachment sites for metal oxides. Activation with KMnO4 not only generates active MnOx components but also presets ‘seed’ for ZnO crystals growth, which is beneficial for the high dispersion of nano-sized active components. The presented method is beneficial to producing sorbents with better structure and promoted desulfurization performance.

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“…Additionally, from the XRD and N 2 physisorption analysis results, it could be conducted that a small amount of lanthanum doping was beneficial for the weakness of crystallization of ZnO particles, which is useful to the reachable efficiency of reactants due to the promotion of active sites concentration. 47 The La dopant could also promote the electron density around Zn ions as well as the redox capacity of ZnO (as suggested by H 2 -TPR and O 1s analysis), which enhanced the desulfurization efficiency for 3D-230-LZS.…”

Section: Desulfurization Performance 321 Evaluation Of the Desulfuriz...mentioning

confidence: 97%

Synergetic Improvement of the Reactive Performance of Hydrogen Sulfide Adsorption on a Three-Dimensional Ordered Macroporous La-Doped ZnO Sorbent

Liu,

Zhang,

Liu

et al. 2024

Energy Fuels

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Herein, a three-dimensionally ordered macroporous (3DOM) La-doped zinc oxide and silica composite was prepared and fabricated for the middle-temperature hydrogen sulfide (H 2 S) removal. Different pore sizes and La dopant effects were analyzed by various characteristic techniques as well as their performance on precise desulfurization (outlet H 2 S concentration < 0.1 ppm) were evaluated. The morphology analysis showed that the series synthesized La 0.05 Zn 0.95 O 1±δ /SiO 2 samples were guided as a typical 3DOM framework. As a result, the sample 3D-230LZS, with the SiO 2 mixture of 50 wt %, PS precursor average size of 230 nm, and La dopant molar ratio to Zn ion of 0.05:0.95, revealed the best desulfurization precision and efficiency due to the textural properties with high surface area, well-dispersed ZnO particles, and well ranked interconnected macropores with abundant mesopores, which markedly accelerates gaseous reactants diffusion compared with that of the bulk sorbent. What is more, by elevating the surficial electron density of zinc cation and oxygen transfer capability, the synergistic effect is believed to be profitable for La 0.05 Zn 0.95 O 1±δ /SiO 2 sulfidation, which also contributes to preserve a stable performance over multiple sulfidation/regeneration cycles. During different atmosphere effects estimation, benefiting from a macro-mesopore skeleton with interconnected channels, the humidity tolerance of the sorbent could be maintained under 5 vol % of vapors, while the reaction capacity dropped sharply after more vapor injection. On the other hand, the existence of hydrogen in the H 2 S flow made a slightly positive impact on desulfurization since it creates a reducing circumstance for Zn−O and Zn−S bonds as well as the converting effect of ZnSO 4 , leading to more active sites. At the same time, a trace amount of O 2 contributed to a promotion effect on desulfurization due to the fact that the La dopant can create a synergistic effect of catalytic oxidation and adsorption.

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Insights into the effects of metal-ion doping on the structure and hot-coal-gas desulfurization properties of Zn-based sorbents supported on SBA-15

Cited by 17 publications

References 40 publications

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Porous Carbon Nanofibers Supported Zn@MnOx Sorbents with High Dispersion and Loading for Hot Coal Gas Desulfurization

Synergetic Improvement of the Reactive Performance of Hydrogen Sulfide Adsorption on a Three-Dimensional Ordered Macroporous La-Doped ZnO Sorbent

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Insights into the effects of metal-ion doping on the structure and hot-coal-gas desulfurization properties of Zn-based sorbents supported on SBA-15

Cited by 17 publications

References 40 publications

Bimetallic-MOF-Derived ZnxCo3–xO4/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Bimetallic-MOF-Derived ZnxCo3–xO4/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Porous Carbon Nanofibers Supported Zn@MnOx Sorbents with High Dispersion and Loading for Hot Coal Gas Desulfurization

Synergetic Improvement of the Reactive Performance of Hydrogen Sulfide Adsorption on a Three-Dimensional Ordered Macroporous La-Doped ZnO Sorbent

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Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization