Porous carbon nanofibers supported Zn@MnO  sorbents with high dispersion and loading content for hot coal gas desulfurization

Feng, Yu; Zhang, Man; Sun, Yangjie; Cao, Chunyan; Wang, Jiancheng; Ge, Mingzheng; Cai, Weilong; Mi, Jie; Lai, Yuekun

doi:10.1016/j.cej.2023.142590

Cited by 6 publications

(3 citation statements)

References 49 publications

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“…After removing the PS templates by pyrolysis, 3DOM metal–silica complexes with well regular pore distribution were obtained and shown in Figure c,d,g,h,k,l, where different pore diameters were observed in the derived samples 3D-230LZS, 3D-340LZS, and 3D-470LZS, respectively. It has been demonstrated that silica participation in 3DOM compounds duplicates a superior rank structure by PS template to create a strong skeleton framework of ordered macropores, combining the smooth surfaces that may suggest the well crystallized product, which plays as a solidification agent during 3D pore arrays . It has been demonstrated by our previous research on SiO 2 -supported ZnFe 2 O 4 compounds that silica involvement was beneficial to form and sustain a high-quality 3DOM structure .…”

Section: Resultsmentioning

confidence: 92%

“…It has been demonstrated that silica participation in 3DOM compounds duplicates a superior rank structure by PS template to create a strong skeleton framework of ordered macropores, combining the smooth surfaces that may suggest the well crystallized product, 25 which plays as a solidification agent during 3D pore arrays. 26 It has been demonstrated by our previous research on SiO 2 -supported ZnFe 2 O 4 compounds that silica involvement was beneficial to form and sustain a high-quality 3DOM structure. 23 Accompany with the shrinkage rate of ∼10.1, 16.4, and 24.6% compared with that of the original microspheres resulted from calcination, the macropore diameter of the 3D-230LZS, 3D-340LZS, and 3D-470LZS materials were about 204, 286, and 355 nm, respectively.…”

Section: Characterization 311 Textural Featuresmentioning

confidence: 94%

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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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Section: Resultsmentioning

confidence: 92%

Section: Characterization 311 Textural Featuresmentioning

confidence: 94%

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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“…Carbon nanofibers (CNFs) have garnered substantial attention due to their exceptional mechanical strength, low density, superior electrical conductivity, and remarkable adsorption capabilities. − These exceptional properties make CNFs highly promising for a broad range of applications, including aerospace, energy, catalysis, and various industrial sectors. − Porous carbon nanofibers (PCNFs) offer not only reduced weight but also an increased specific surface area, thereby enhancing their adsorption and filtration performance. − The spinning methods used to fabricate hollow and porous fibers include coaxial spinning, , phase separation, and template method . However, these techniques encounter significant challenges of low production efficiency and considerable quality variations, which hinder the large-scale and cost-effective production of porous carbon fibers. − Additionally, a critical impediment to the efficient development of PCNFs is intricate control of the pore structure. Therefore, efficient preparation methods for synthesizing PCNFs with high specific surface areas and superior adsorption capabilities are essential for effective application.…”

Section: Introductionmentioning

confidence: 99%

Polymer Blend Blow Spinning of Flexible Porous Carbon Nanofibers Capable for Multiapplication

Zhang,

Song,

et al. 2024

ACS Appl. Nano Mater.

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Highly efficient production of porous carbon nanofibers (PCNFs) is indispensable for applications in adsorption, thermal insulation, catalysis, batteries, etc. Herein, rapid fabrication of PCNFs with flexible and efficient adsorption properties was achieved through polymer blend blow spinning at a rate of 10−30 mL•h −1 . Polyacrylonitrile (PAN) was used as the organic precursor to prepare PCNFs, with varying mass fractions of poly(methyl methacrylate) (PMMA) microspheres employed as pore-forming agents. Following high-temperature carbonization, the diameter of PCNFs was adjusted within a range of 0.2−1.2 μm, resulting in a high specific surface area of 34.63 m 2 g −1 and a pore distribution of 3−20 nm. PCNFs demonstrated exceptional mechanical resilience, withstanding cyclic compression strains of up to 60% and achieving a peak compression stress of 12.2 kPa. Additionally, PCNFs exhibited a significant adsorption capacity for oils and benzene, coupled with superior thermal insulation performance and an ultralow thermal conductivity of 0.022 W•(m•K) −1 . PCNFs can also be used as sensors and demonstrated unmatched sensitivity to minute pressure variations ranging from 0 to 1 N. The polymer blend blow spinning technique showcased operational simplicity and remarkable versatility across various materials. This excellent functional expandability demonstrated that the strategy held significant potential for the large-scale production of multifunctional PCNFs.

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Reversible thermochromic K2O·nSiO2-based anti-fire glass with bidirectional responsion and memory function

Mu,

Xin,

Meng

et al. 2024

Ceramics International

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Porous carbon nanofibers supported Zn@MnO sorbents with high dispersion and loading content for hot coal gas desulfurization

Cited by 6 publications

References 49 publications

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

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

Polymer Blend Blow Spinning of Flexible Porous Carbon Nanofibers Capable for Multiapplication

Reversible thermochromic K2O·nSiO2-based anti-fire glass with bidirectional responsion and memory function

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