Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 4
·1-15
·
IF 4.3
Guo Yunyu,Wang Yiran,Shao Yuewen,Zhang Shu,Wang Yi,Hu Song,Xiang Jun,Hu Xun
During steam reforming, the performance of a catalyst and amount/property of coke are closely related to reaction intermediates reaching surface of a catalyst. Herein, modification of reaction intermediates by placing Mg-Al-hydrotalcite above Ni/KIT-6 catalyst in steam reforming of glycerol was conducted at 300 to 600 °C. The results revealed that the catalytic activity of Ni/KIT-6 in the lower bed was enhanced with either Mg 1 -Al 5 -hydrotalcite (containing more acidic sites) or Mg 5 -Al 1 -hydrotalcite (containing more alkaline sites) as upper-layer catalyst. The in situ infrared characterization of steam reforming demonstrated that Mg-Al-hydrotalcite catalyzed the deoxygenation of glycerol, facilitating the reforming of the partially deoxygenated intermediates over Ni/KIT-6. Mg-Al-hydrotalcite as protective catalyst, however, did not protect the Ni/KIT-6 from formation of more coke. Nonetheless, this did not lead to further deactivation of Ni/KIT-6 while Mg 5 -Al 1 -hydrotalcite even substantially enhanced the catalytic stability, even though the coke was much more significant than that in the use of single Ni/KIT-6 (52.7% vs. 28.6%). The reason beneath this was change of the property of coke from more aliphatic to more aromatic. Mg 5 -Al 1 -hydrotalcite catalyzed dehydration of glycerol, producing dominantly reaction intermediates bearing C=C, which formed the catalytic coke of with carbon nanotube as the main form with smooth outer walls as well as higher aromaticity, C/H ratio, crystallinity, crystal carbon size, thermal stability, and resistivity toward oxidation on Ni/KIT-6 in the lower bed. In comparison, the abundance of acidic sites on Mg 1 -Al 5 -hydrotalcite catalyzed the formation of more oxygen-containing species, leading to the formation of carbon nanotubes of rough surface on Ni/KIT-6.
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Journal of Energy Storage
·
2025
·
IF 9.8
Cheng Liu,Yi Zhang,Pengrui Zhang,Yigang Ding,Jinhe Sun
A multitude of composite phase change materials (PCM) systems have been developed, resulting in significant advancements in the efficiency of solar thermal storage systems. However, there is a paucity of inorganic-organic composite PCMs systems, and the phase change mechanism remains unclear, which significantly constrains the deployment and advancement of this category of PCMs. To address this gap in the literature, this team has developed a novel organic-inorganic composite PCM system using 30 wt% Mg(NO 3 ) 2 ·6H 2 O (MNH) and 70 wt% propanamide (POA) as raw materials. The thermal physical properties of the PCMs were initially analyzed, and the results demonstrated that the PCMs exhibited favourable latent heat and thermal cycling stability. The melting point was found to be 376.2 K, with a latent heat of melting of 131.93 J·g −1 . It was observed that the melting temperature and latent heat remained essentially unaltered after 500 cycles. Subsequently, the structure of the PCMs was analyzed using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Ultimately, the interaction between liquid MNH and POA was modeled using molecular dynamics, allowing for a deeper understanding of the phase transition mechanism. It is hypothesized that the hydrogen bonds (HBs) between the two substances affects the physical bond, and that HBs contribute to the PCMs having good stability and a high thermal decomposition temperature. The rational mechanism of this phenomenon is explained from many aspects, including structure, Hirshfeld surface and thermal analysis. It is anticipated that the discovery of this new PCMs will facilitate large-scale applications in solar energy storage.
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NANOTECHNOLOGY
·
2025
·Vol. 36
·期 19
·195602
·
IF 2.8
Qing Sun,Jiao Yan,Jiale Yu,Xiaofang Hu,Jian Zhang,Jiawei Sheng
In this study, the core-shell nanostructure of magnesium reinforced cobalt silicate@13X was synthesized by a two-step reaction using zeolite 13X as the initial silicate material and carrier, and the organic pollutant metronidazole was degraded by activating PMS. It was found that 6CoMg-13X had excellent and stable catalytic performance on PMS activation, with a degradation rate of 99.7% in 5 min and a removal rate of more than 99.4% after 5 cycles. Under hydrothermal conditions, 13X gradually dissolved into silicate anion under the action of urea, while Co2+ and Mg2+ reacted on 13X surface to form ultra-thin core-shell nanostructures. The calcination process further improves the stability of the catalyst while reducing cobalt leaching, after calcination, cobalt leaching is only 0.16 mg l−1. In addition, the catalyst had high degradation rates for norfloxacin (NFA), 5-fluorouracil (FLU), tetracycline (TC) and Rhodamine B (RhB), which were 90.29%, 97.36%, 96.24% and 99.69%, respectively. EPR and quenching experiments indicated that SO4‧− and 1O2 are the main active substances in the 6CoMg-13X-PMS system, and ‧OH and ‧O2− also play a certain role in the degradation system. This research provides a feasible solution for developing high performance cobalt-based environmental purification catalysts.
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PubMed
高影响因子
Nanoscale
·
2025
·Vol. 17
·期 35
·20465-20475
·
IF 5.1
Weiyi Li,Min Zhang,Shen Cai,Yan Xin,Huajun Tian
Alluaudite-type Na2+2xFe2−x(SO4)3 has been a promising cathode material for sodium-ion batteries (SIBs) due to its high operating voltage and stable structure. However, its actual electrochemical performance suffers from intrinsic sluggish kinetics and poor electronic conductivity. In this work, for the first time, we propose a Na2.48(Fe0.89Mg0.03Sn0.04)1.76(SO4)3 cathode material prepared via a Mg/Sn co-doping strategy. Inactive Mg2+ stabilizes the structure, while Sn4+ inhibits the decomposition of electrolytes under high voltage. The Mg/Sn co-doping strategy enhances the kinetics of sodium ion diffusion reactions, leading to improved electrochemical properties, especially at low temperatures. The optimal NFMS/C-Sn0.03 cathode exhibits a long-term capacity retention of 91.6% after 1500 cycles at 5C and outstanding reversible capacities of 74.3 and 58.3 mAh g−1 at 10C and even at 50C, respectively. Furthermore, the NFMS/C-Sn0.03 cathode demonstrates a high capacity retention of 95.5% at −5 °C and 88.4% at −15 °C, with a remarkable capacity retention of 93.9% after 1000 cycles at room temperature and 85.5% after 700 cycles at −15 °C, respectively. Electron paramagnetic resonance (EPR) and atomic force microscopy (AFM) techniques confirmed that the presence of unpaired electrons and enhanced electronic conductivity could be attributed to the Mg/Sn co-doping. This work provides a feasible approach for designing low-cost, durable, low-temperature, and high-performance cathode materials for SIBs.
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PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Kehan Wang,Zhanglian Hong,Xiuquan Gu,Mingjia Zhi
The design of high-entropy O3-type layered oxides has been considered as an effective method for suppressing multiple phase transitions during cycling and improving stability. Herein, a series of high entropy layered oxides (HEOs) with different Mg:Sn ratios are investigated. It is found that the structural stability and electrochemical performance of these HEOs can be optimized by varying the Mg to Sn ratio. A lower Mg content is conducive to the formation of a single-phase HEO. An optimized HEO composition (namely NaNi 0.1 Co 0.2 Mn 0.2 Fe 0.2 Cu 0.1 Mg 0.04 Sn 0.16 O 2 ) exhibits high specific capacity (137.3 mAh g −1 at 0.1C) and good rate capability (~100 mAh g −1 at 1C). The cycling performance (capacity retention of ~87 % after 200 cycles at 0.5C) is also comparable to the reported O3-type HEOs. Such good performance can be attributed to its good redox activity, low interfacial impedance, higher Na + diffusion coefficient (2.26 × 10 −11 cm 2 s −1 ) and reversible O3-P3 phase transition.
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JOURNAL OF POWER SOURCES
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2017
·
IF 6.395
Xiubo Xie,Ming Chen,Peng Liu,Jiaxiang Shang,Tong Liu
Nickel sulfides decorated reduced graphene oxide (rGO) has been produced by co-reducing Ni 2+ and graphene oxide (GO), and is subsequently ball milled with Mg nanoparticles (NPs) produced by hydrogen plasma metal reaction (HPMR). The nickel sulfides of about 800 nm completely in situ change to MgS, Mg 2 Ni and Ni multiple catalysts after first hydrogenation/dehydrogenation process at 673 K. The Mg-5wt%NiS/rGO nanocomposite shows the highest hydrogen desorption kinetics and capacity properties, and the catalytic effect order of the additives is NiS/rGO, NiS and rGO. At 573 K, the Mg-NiS/rGO nanocomposite can quickly desorb 3.7 wt% H 2 in 10 min and 4.5 wt% H 2 in 60 min. The apparent hydrogen absorption and desorption activation energies of the Mg-5wt%NiS/rGO nanocomposite are decreased to 44.47 and 63.02 kJ mol −1 , smaller than those of the Mg-5wt%rGO and Mg-5wt%NiS samples. The best hydrogen desorption properties of the Mg-5wt%NiS/rGO nanocomposite can be explained by the synergistic catalytic effects of the highly dispersed MgS, Mg 2 Ni and Ni catalysts on the rGO sheets, and the more nucleation sites between the catalysts, rGO sheets and Mg matrix.
研究领域:
材料科学
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纳米科技
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能源化学
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催化化学
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储氢材料
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Chemical Engineering Journal Advances
·
2026
·
IF 6.9
Wenbin Fan,Lizhi Jiang,Bingqing Yan,Huifang Li
Driven by surging global lithium demand, highly selective lithium separation from magnesium-rich brines is urgently required. This work systematically investigated the structure–performance relationship of four aryl-substituted phosphates (TOP, DPOP, IPPP, TPP). Moderate aryl substitution widened the coordination difference between Li + and Mg 2+ through electron-withdrawing effects, and DPOP exhibited the optimal balance of extraction capacity and selectivity. A ternary synergistic extraction system was fabricated with DPOP as the primary extractant, P204 to immobilize Fe 3+ , and eco-friendly diethyl succinate (DES) as a polar modifier. DES inhibited third-phase formation at DPOP contents of 10–50 vol.% and produced synergistic solvation via carbonyl groups. Under optimized conditions, the single-stage Li + extraction efficiency achieved ∼73%, and the Li/Mg separation factor reached 1630, nearly 80 times that of the traditional TBP–FeCl 3 system. Synergistic coordination of P204 and DES stabilized Fe 3+ in the organic phase, realizing quantitative lithium stripping with deionized water and avoiding concentrated acid and saponification. The organic phase maintained over 80% extraction efficiency after ten cycles. Slope analysis and FT-IR confirmed the extracted complex LiFeCl 4 •2DPOP•0.1DES. This work transforms DPOP into a sustainable, low-cost, closed loop industrial solution for lithium recovery from high Mg/Li brines.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Jiaru Wei,Beichen Sun,Wenbiao Ma,Fengfeng Gao,Xiaowei An,Xiao Du,Xiaogang Hao
Spinel LiMn 2 O 4 is a promising electrode for electrochemically switched ion exchange (ESIX) lithium extraction, but its sluggish solid-phase diffusion and severe Mn dissolution limit its application in high-Mg 2+ /Li + salt lake brines. Herein, we report a clear size effect that regulates Li + intercalation kinetics and Mg 2+ /Li + separation by comparing hydrothermally synthesized nano-sized N-LiMn 2 O 4 (20–100 nm) and commercial micron-sized LiMn 2 O 4 (∼10 μm). Nanosizing induces preferential exposure of thermodynamically stable (111) facets, effectively suppressing surface reconstruction and Mn dissolution. In-situ distribution of relaxation time (DRT) reveals that the rate-limiting step changes from pure solid-phase diffusion in micron LiMn 2 O 4 to surface-diffusion co-control in N-LiMn 2 O 4 , reducing solid-phase diffusion resistance by 75% and charge-transfer resistance by 78.6%. Benefiting from kinetic optimization, the N-LiMn 2 O 4 /C/PVDF electrode maintains a Li + /Mg 2+ separation factor > 100 even at an ultrahigh Mg 2+ /Li + ratio of 500, far exceeding the micron counterpart. After optimization (wet film thickness = 200 μm, adsorption potential = 1.0 V), the electrode retains >90% capacity after 10 cycles in 200 mg·L −1 LiCl solution. This work clarifies the size-dependent kinetic transition mechanism and provides a rational design strategy for high-selectivity electrodes toward efficient lithium extraction from high-Mg/Li brines.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Wenjing Zhang,Yun Wang,Hao Xu,Hui Zhang,Xiaoxia Lv,Xiaobo Pan
The development of high-performance aqueous zinc-ion batteries (AZIBs) is hindered by the intrinsic limitations of manganese-based cathodes, such as poor electronic conductivity and structural instability. Herein, we report a rational Mg²⁺/Al³⁺ co-doping strategy to engineer the properties of α-MnO₂. The optimized Mg₁Al₁@MnO₂ cathode exhibits a remarkable Zn²⁺ storage performance, delivering a high reversible capacity of 354 mAh g⁻¹ at 0.1 A g⁻¹ , exceptional rate capability, and outstanding cycling stability with 74.7% capacity retention after 1000 cycles at 2 A g⁻¹ . Comprehensive characterization reveals that the larger Mg²⁺ ions act as pillars to expand the (2 ×2) tunnels, while the similarly-sized Al³⁺ ions substitute for Mn⁴⁺ to reinforce the host framework. This synergistic modification induces a charge compensation effect, generating abundant oxygen vacancies and optimizing the Mn³⁺/Mn⁴⁺ ratio, which collectively enhance the intrinsic conductivity and ion diffusion kinetics. Furthermore, a highly reversible H⁺/Zn²⁺ co-(de)intercalation mechanism is confirmed. This work provides a generalizable design principle for developing durable cathode materials for advanced energy storage systems.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Tian Yuan,Pu Yang,Shiyu Lv,Kerong Fu,Qiuxian Zhang,Xia Yao,Yanli Luo,Feng Wang
A novel Mg-based defect-modified composite material (MOF-Mg(OH) 2 -HP) was prepared using MOF as a precursor, featuring a unique layered structure with abundant oxygen defects and delocalized electrons on its surface. • MOF-Mg(OH) 2 -HP can be activated by natural light, generating a large amount of reactive species through the “light-Fenton-like” pathway. Superoxide radicals (·O 2 − ) and holes (h + ) are the primary reactive species, which simultaneously oxidize non-reactive organophosphorus compounds and recover orthophosphate (achieving a 100% phosphorus removal rate within 90 min). • It demonstrates exceptional multifunctionality in actual aquaculture wastewater, effectively eliminating 92.84% of Escherichia coli and 98.69% of Chlorella pyrenoidosa , providing a green synergistic solution for integrated water purification and resource recovery strategies. The low-cost and harmless treatment of dairy wastewater is a focal point in agricultural development today. This study innovatively utilizes hydrogen peroxide to modify Mg-MOF-derived oxides, preparing a series of hydrogen peroxide-modified composite materials rich in defects. For the first time, an integrally formed composite material consisting of Mg(OH) 2 with O 2 2− on the outside and MgO on the inside is synthesized. Compared to modified materials prepared using commercially available MgO as the raw material, this material possesses unique Mg(OH) 2 /MgO heterojunctions, a larger specific surface area, abundant oxygen defects, and higher active oxygen content. Starting from the current issues of poor universality, high energy consumption, and difficulties in simultaneous harmless treatment of wastewater in organic phosphorus oxidation materials, we designed an efficient degradation of various organic phosphorus compounds and resource recovery of orthophosphorus using sunlight. This is mainly achieved through the synergistic effect of surface O 2 2− hydrolysis (Fenton-like pathway) and the generation of oxidizing active species through photoexcitation at oxygen vacancies (photocatalytic pathway), resulting in efficient degradation of organic phosphorus and simultaneous recovery (with a removal rate of 100% in 90 min).This material is the first to demonstrate the ability to simultaneously kill 92.84% of Escherichia coli and 98.69% of Chlorella pyrenoidosa during phosphorus removal, proposing a novel collaborative solution for green recovery and harmless treatment of pollutants. Download: Download high-res image (163KB) Download: Download full-size image
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Catalysts
·
2026
·Vol. 16
·期 4
·312
·
IF 4.5
Xuelai Zhao,Wuyu Wang,Zhenjing Jiang,Xinghua Zhang,Xiuzheng Zhuang,Qi Zhang,Longlong Ma
The homogeneous nature of L-proline organocatalysts restricts their application in aldol condensation due to poor recyclability and stability. Herein, L-proline was heterogenized by ionic intercalation into Mg–Al layered double hydroxides (LDHs), yielding a series of proline-intercalated catalysts with tunable layer structures. Co-precipitation and memory-effect reconstruction strategies were employed to regulate interlayer spacing and proline loading. The resulting catalysts exhibited efficient performance in the aldol condensation of furfural with ketones under mild conditions. The reconstructed catalyst re-Mg4Al1P achieved a furfural conversion of 88.67% and a total product yield of 85.54% at room temperature, with product selectivity exceeding 95%. Structural characterizations confirmed that proline was stabilized within the LDH interlayers via R–COO—Mg electrostatic interaction while preserving the secondary amine active site. Mechanistic analysis indicated that the reaction proceeded through enamine- or enol-mediated pathways depending on water content, while the layered LDH framework imposed geometric confinement that suppressed side reactions. Catalyst deactivation in aqueous systems was mainly attributed to proline leaching rather than structural collapse.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Zheng Su,Hua Wang,Xianzhu Ye,Konghu Tian,Weiqi Huang,Jing He,Yulan Guo,Xingyou Tian
In this work, we presented novel cycloaliphatic epoxy resin composites filled with multi-layer graphene (mG)/hexagonal boron nitride (h-BN) with high thermal conductivity and good electrical insulating. Firstly, the h-BN platelets were modified by mussel-inspired method with dopamine chemistry to obtain the modified filler h-BN@PDA. And the attachment of polydopamine molecule improved the interfacial adhesion between polymer matrix and filler. Secondly, the mG with fixed content was mixed with h-BN@PDA and then the hybrid filler mG/h-BN@PDA was added to the cycloaliphatic epoxy resin to obtain the polymer composites . Because of the high aspect of the filler, low viscosity of the polymer matrix , and assistance of the gravity force, the hybrid filler would stack alignment. It was found that the hybridization of the filler and alignment of the hybrid filler resulted in the enhancement of properties of the composites such as the thermal decomposition, mechanical (tensile strength = 5.50 MPa), thermal (through-plane ∼ 1.27 W/m K, in-plane ∼ 1.31 W/m K) and electrical insulating (electrical conductivity < 1.5 × 10 −10 S/cm) properties. The obtained composites could be applied in thermal management area.
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危险品化学品经营许可证（带存储）