CATALYSIS LETTERS
·
2025
·Vol. 155
·期 11
·1-16
·
IF 2.4
Yao Liang,Wang Hao,Li Shuangde,Chen Yunfa
Sulfur dioxide (SO 2 ) emissions, a major source of air pollution, can be effectively mitigated through catalytic reduction to elemental sulfur using carbon monoxide (CO). In this study, Fe loaded TiO 2 catalysts were synthesized and subsequently subjected to pre-sulfurization treatment under varied conditions. Their catalytic performance was evaluated in SO 2 reduction for thermal and dielectric barrier discharge (DBD) plasma enhanced thermal catalysis. The results showed that OFS-Fe/TiO 2 catalyst with oxygen-free sulfurization (OFS) treatment exhibited the highest catalytic activity, achieving above 90% SO 2 conversion between 250 and 550 °C under oxygen-assisted reaction (OAR), along with long-term stability under 40–60% water vapor. However, the SO 2 conversion were below 20% for Fe/TiO 2 and oxygen-assisted sulfurization OAS-Fe/TiO 2 catalysts within 250 to 400 °C. Notably, the significantly enhanced catalytic performance of the OFS-Fe/TiO 2 catalyst was probably attributed to the high dispersion of Fe over nano-TiO 2 , the lower Fe 2+ /Fe 3+ ratio, and the formation of active FeS 2 species detected by SEM-EDS, XPS and TPD techniques. Furethermore, a conversion efficiency exceeding 90% was maintained throughout 80 to 550 °C under DBD plasma reaction over POFS-Fe/TiO 2 catalyst with room-temperature DBD plasma oxygen-free sulfurization treatment, surpassing thermal catalysis performance. The significantly enhanced low-temperature activity of plasma catalysis was attributed to the lowest Fe 2+ /Fe 3+ ratio, together with the transformation of FeS 2 into FeS, generating more sulfur vacancies. In-situ DRIFTS experiments confirmed two distinct SO 2 adsorption and reduction mechanisms between Fe/TiO 2 and OFS-Fe/TiO 2 catalysts. The results demonstrate that pre-sulfurization and plasma modification serve as an effective catalytic strategy to enhance CO-mediated SO 2 reduction, offering a sustainable emission control approach through sulfur resource utilization. Graphical
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Fuels
·
2025
·Vol. 6
·期 4
·76
·
IF 2.8
Jun Hu,Hongyang Yu,Yanan Wang
The chemical looping steam reforming of methane (CLSR) employing Fe-containing oxygen carriers can produce syngas and hydrogen simultaneously. However, Fe-based oxygen carriers exhibit low CH4activation ability and cyclic stability. In this work, oxygen carriers with fixed Fe content and different Fe/Ni ratios were synthesized by the sol–gel method to investigate the effects of Ni-Fe-Al interactions on CLSR performance. Ni-Fe-Al interactions promote the growth of the spinel structure and regulate both the catalytic sites and the available lattice oxygen, resulting in the CH4conversion and CO selectivity being maintained at 96–98% and above 98% for the most promising oxygen carrier, with an Fe2O3content of 20 wt% and Fe/Ni molar ratio of 10. The surface, phase, and particle size were kept the same over 90 cycles, leading to high stability. During the CLSR cycles, conversion from Fe3+to Fe2+/Fe0occurs, along with transformation between Ni2+in NiAl2O4and Ni0. Overall, the results demonstrate the feasibility of using spinel containing earth-abundant elements in CLSR and the importance of cooperation between oxygen release and CH4activation.
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Journal of Thermal Science
·
2025
·
IF 2.6
Yu Hao,Wang Weiran,Bian Zhiguo,Ma Xiaotong,Lu Xiao,Chang Long,Zhang Wan
The modification with dark metallic oxide is identified as the crucial strategy to enhance optical absorptions of calcium-based materials for the direct solar-driven thermochemical energy storage. The effect of modification on the heat release behavior in carbonation of calcium-based material has been widely investigated, but its effect on the heat storage behavior in calcination is lacking of sufficient research, typically for low-cost calcium resource such as carbide slag. The Fe-modified and Mn-modified carbide slags for CaCO 3 /CaO heat storage were synthesized and their optimum decomposition temperatures, effective heat storage conversions, heat flows and heat storage rates in endothermic stage were investigated. Although the Fe modification exacerbates the CaO sintering due to the formation of Ca 2 Fe 2 O 5 , that is still effective in reducing the regeneration temperature of CaO in CaCO 3 /CaO cycles. The Mn modification enhances significantly sintering resistance by forming the CaMnO 3 and its transformation into Ca 2 MnO 4 . The effective heat storage conversion of Mn-modified carbide slag after 30 cycles is 3.2 times as high as that of untreated carbide slag. Mn-modified carbide slag exhibits the lowest regeneration temperature and the highest heat storage rate after cycles. The loose and stable porous structure of Mn-modified carbide slag contributes to its superior endothermic performance. Therefore, Mn-modified carbide slag seems to be the potential candidate for calcium looping thermochemical heat storage.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Ruxing Gao,Xixi Chen,Chao Deng,Lujing Xu,Leiyu Zhang,Chundong Zhang,Ki-Won Jun,Tiansheng Zhao,Yingju Yang
Catalytic hydrogenation of CO 2 into light olefins has gained increasing attention, nevertheless the design of an efficient catalyst with high selectivity towards light olefins is still challenging. Herein, aiming at improving the selectivity of targeted light olefins, we successfully synthesized a series of Na/MFe 2 O 4 (M = Co, Zn and Cu) spinel catalysts via hydrothermal synthesis, and tried to establish their activity-structure relationship. Among the Na/MFe 2 O 4 spinel catalysts, the Na/CoFe 2 O 4 catalyst shows superior catalytic performance, thanks to the well-crystallized CoFe 2 O 4 nanoparticle which has the good dispersibility, reducibility and carburizing ability. Moreover, compared with the traditional Na/Fe–Co catalyst obtained via co-precipitation, the formation of CoFe 2 O 4 with uniform crystal phase and smaller crystal size for Na/CoFe 2 O 4 spinel catalyst is more conducive to the formation of active and stable χ-(Co x Fe 1 − x ) 5 C 2 alloy carbide, thereby resulting in excellent catalytic activity and stability. On this basis, to further improve the C 2-4 = selectivity, we coupled the Na/CoFe 2 O 4 component with acidic zeolites (e.g., SAPO-34, MOR and Hβ), and the Na/CoFe 2 O 4 @SAPO-34 catalyst is found to possess a superior C 2-4 = selectivity of 42 % with a CO 2 conversion of 39 %. This work can provide a useful understanding of designing efficient spinel-structured bimetal catalysts for selective conversion of CO 2 into value-added light olefins.
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ACS Applied Bio Materials
·
2025
·
IF 4.7
Ihtisham Ahmad Butt,Peinan Yin,Naihan Chen,Wei Zhang
The efficiency of photothermal therapy based on conventional Fe3O4 nanoparticles (NPs) is limited due to their low absorption in the near-infrared (NIR) region. To surmount this obstacle, α-Fe nanoparticles/multiwalled carbon nanotubes (MWCNTs) composite is synthesized by incipient wetness impregnation (IWI). Due to improved extinction and heat generation mechanism (plasmons/electrons thermalization) of metallic Fe NPs with in nanocomposite structure, the photothermal conversion efficiency of Fe/MWCNTs composite is 87.98% (content: 60 μg/mL, 808 nm at power density of 1 W/cm2), which is highest among the previously reported Fe3O4 and other carbon-based nanostructures. The HaCaT cell viability after 72 h of coculturing is more than 91%, indicating the good biocompatibility of nanocomposite. The viability of B16–F10 melanoma cells is only 9.78% (808 nm laser irradiation for 15 min at 0.33 W/cm2), demonstrating the potential for hands-on applications.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Tuowen Chen,Jingyi Tuo,Yihao Wu,Hui Wang,Yongduo Sun,Xuefei Huang
Fe-Cr alloys were fabricated using powder metallurgy (PM) with varying additions of ZrC (0–1.5 wt%) to investigate the influence on microstructure and mechanical properties. The resulting alloys exhibited a bimodal grain structure with dispersed nano-oxides (TaO, ZrO 2 ) and carbides (ZrC). The alloy containing 1.5 wt% ZrC demonstrated the most favourable combination of properties, achieving a yield strength of 1373 MPa and an elongation of 11.9 % at room temperature, which is attributed to synergistic dispersion strengthening. At 700°C, this alloy retained a yield strength of 470 MPa, surpassing that of many oxide dispersion-strengthened alloys. Incorporating ZrC refined the microstructure, promoted phase transformations, and inhibited the formation of coarse oxides, enhancing strength and ductility.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hao Wen,Haoyang Li,Weiwei Bai,Huibin Ge,Ruiyang Qu,Hepeng Zhang,Yueling Cao
In the quest for sustainable catalytic processes, non-noble metal catalysts offer a promising alternative for the selective hydrogenation of organic compounds. This work reports the design of a Fe-doped Mo 2 C catalyst (Fe-Mo 2 C@CN), featuring partial substitution of Mo atoms with Fe atoms, which exhibits remarkable catalytic performance in the chemoselective hydrogenation of nitro compounds. The Fe-Mo 2 C@CN-700 catalyst achieves a turnover frequency (TOF) of 36.6 h −1 at mild reaction conditions (80 °C and 1 MPa H 2 ), outperforming most non-noble metal catalysts reported under similar conditions. More notably, at near room temperature (30 °C and 1 bar H 2 ), it achieves high yields (≥93 %), making it competitive with noble metal catalysts. Studies reveal that Mo 2 C serves as the primary active site for hydrogenation, and partial substitution of Mo atoms with atomically dispersed Fe not only modulates the adsorption strength but also induces a tilted adsorption configuration of the nitro group, thereby facilitating more efficient hydrogenation. Fe-Mo 2 C@CN-700 delivers excellent yields (86–98 %) in the hydrogenation of a wide variety of functionalized nitroarenes to anilines, including sulfur-containing substrates and several high-value pharmaceutical nitroaromatics. The optimal Fe-doped Mo 2 C catalyst can also maintain its activity for >18 h in a fixed-bed reactor, implying its promising industrial application.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Qianyi Wu,Mohammed Kamruzzaman
The detection of mercury(II) (Hg2+) and chromium(VI) (Cr6+) is of significant importance due to their high toxicity and harmful effects on the environment and human health. Conventional detection methods are often expensive and time-consuming, highlighting the need for efficient alternatives. Nanozyme-based detection systems have emerged as promising solutions, offering high sensitivity, stability, and cost-effectiveness. However, many existing nanozymes contain toxic components, limiting their practical application in environmental and food safety monitoring. This study reported the development of an organic polymer-based C-A-Fe nanozyme, synthesized via a simple self-assembly chelation process and exhibiting peroxidase-like activity. This nanozyme enabled an effective colorimetric sensing approach for Hg2+ and Cr6+ detection. This nanozyme enables highly sensitive and selective colorimetric detection of Hg2+ and Cr6+ with the assistance of glutathione (GSH) and 8-hydroxyquinoline (8-HQ), achieving detection limits as low as 9.65 nM for Hg2+ and 4.13 nM for Cr6+. Moreover, the system demonstrated high recovery rates in tap water, cod, and spinach samples, confirming its potential for real-world applications in environmental and food safety monitoring.
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Materials Today Chemistry
·
2026
·
IF 7.4
Zhen Li,Mengting Zhu,Junchao Qian,Ruguang Ma,Zhengying Wu
One of the key challenges in the development and application of thermo-electrochemical cells (TECs) as energy-harvesting systems is the availability of economically feasible electrode materials. In this study, a Fe-doped molybdenum dioxide (MoO 2 ) with Pt-like electrochemical performance was feasibly synthesized via a solvothermal method combined with an annealing treatment. The obtained Fe-doped MoO 2 (Fe–MoO 2 ) displays a uniform spherical morphology with an average size of 24 nm. Moreover, Fe doping reduces the lattice spacing and modulates the electronic structure of MoO 2 . Thereby, the optimized Fe–MoO 2 exhibits a high active surface area (ESA = 1.69 cm 2 ) and very low contact potential difference (CPD = 0.097 V), showing a short-circuit current density ( J sc = 0.520 mA cm −2 ) and a maximum power density ( P max = 5.07 μW cm −2 ) better than pure MoO 2 (0.464 mA cm −2 , 4.72 μW cm −2 ) and comparable to commercial Pt (0.517 mA cm −2 , 4.97 μW cm −2 ) electrodes in TECs (ΔT = 25.2 K). Additionally, this Fe–MoO 2 -based TEC maintains stable voltage and current over 7 h, indicating excellent stability and reversibility in the cycling tests. This study demonstrates that Fe-doped MoO 2 can serve as a low-cost, high-performance electrode material for TECs, offering a new solution for low-grade heat recovery.
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DIAMOND AND RELATED MATERIALS
·
2026
·
IF 5.1
Jingwen Zhong,Lini Huo,Haiyi Zhong,Peiyuan Li
The rapid and on-site detection of 4-nitrophenol (4-NP), a refractory and highly toxic environmental pollutant, remains a significant challenge. In this study, iron-doped carbon dots (Fe-CDs) were synthesized via a facile one-pot hydrothermal method using a natural herbal precursor, Citri Reticulatae Pericarpium, as the carbon source. Comprehensive characterization revealed that the Fe-CDs are uniform quasi-spherical nanoparticles with hydrophilic surfaces rich in functional groups such as hydroxyl and carboxyl. This structure endows them with dual functionality: strong intrinsic fluorescence and excellent peroxidase-like activity at neutral pH. Leveraging these properties, we constructed a dual-mode (fluorescence/colorimetric) sensing platform integrated with smartphone-based colorimetric analysis for the rapid, on-site detection of 4-NP. The platform exhibited high sensitivity with a detection limit of 0.17 μM, excellent selectivity against common interferents, and reliable performance in real water samples with satisfactory recovery rates (95.45–107.38 %). Furthermore, the intrinsic Fenton-like activity of the Fe-CDs enabled the oxidative degradation of 4-NP This work presents a sustainable and efficient strategy for environmental monitoring and remediation, highlighting the great potential of herb-derived carbon-based nanozymes in portable sensing applications.
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MATERIALS & DESIGN
·
2015
·
IF 3.501
X.A. Fan,Z.Y. Wu,G.Q. Li,J. Wang,Z.D. Xiang,Z.H. Gan
Intergranular insulated Fe–6.5 wt.%Si/SiO 2 composite compacts were prepared by in-situ chemical deposition combined with a subsequent spark plasma sintering process. Most of the conductive Fe–6.5 wt.%Si alloy particles were coated with SiO 2 insulating layer in Fe–6.5 wt.%Si/SiO 2 composite compacts. The presence of SiO 2 insulating layer increased the resistivity by two orders of magnitude for intergranular insulated Fe–6.5 wt.%Si/SiO 2 composite compacts (4.8 × 10 − 5 Ω·m) compared with that of Fe–6.5 wt.%Si compacts without SiO 2 insulating layer (9.7 × 10 − 7 Ω·m). In addition, most of the eddy currents could be confined in the SiO 2 -coated Fe–6.5 wt.%Si particles, which equated to reducing the effective radius of eddy current in Fe–6.5 wt.%Si alloy. So, the intergranular insulated Fe–6.5 wt.%Si/SiO 2 composite compacts presented a lower core loss compared with that of Fe–6.5 wt.%Si compacts without SiO 2 insulating layer or traditional Fe–6.5 wt.%Si electrical steels at medium and high frequencies. Good soft magnetic properties were also obtained for the intergranular insulated Fe–6.5 wt.%Si/SiO 2 composite compacts, with a saturation magnetization of 164.6 emu/g, a coercive force of 12 Oe, and a relative permeability of 3.2 × 10 3 at 50 Hz. The intergranular insulated Fe–6.5 wt.%Si/SiO 2 composite compacts provide valuable inspiration for developing new high silicon electrical steel cores with low core loss and excellent magnetic and electric properties.
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International Journal of Electrochemical Science
·
2023
·Vol. 14
·期 6
·5820-5830
·
IF 1.5
Yao Liug,Xiaojing Liug,Junli Liu,Chaozhong Guo,Yanrong Li,Jin Zhang,Zhongbin Li
Ternary Fe-N-C catalysts are regarded as the most promising candidates for low-cost alternatives to the Pt-based materials for catalyzing the oxygen reduction reaction (ORR). In this paper, the Fe and N codoped carbon catalyst (Fe-Py@K-800) with the unique foam-like 3D structure has been fabricated by using the molecular sieve as a new solid-state template. The results of physical characterization indicate that Fe atoms are coordinated with nitrogen atoms to form the Fe-N ORR-active structure. In contrast with the commercial Pt/C catalyst, the Fe-Py@K-800 displays a comparable ORR electrocatalytic activity with an onset potential of ~1.1 V and a half-wave potential of ~0.88 V ( vs. RHE), however, the long-term stability of Fe-Py@K-800 is obviously better. These results show that iron-organic coordination in the pyrrole ring will play a role in the generation of nitrogen-rich active sites, which facilitates the enhancement of ORR activity in alkaline electrolyte.
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