Energy Storage
·
2026
·Vol. 8
·期 4
·e70395
·
IF 4
Chenzhen Liu,Qiaoyu Fan,Yu Sun,Chaocheng Zhang,Hongzhi Yan,Xinjian Liu,Zhonghao Rao
In calcium cycle (CaO/CaCO 3 )-driven thermochemical energy storage systems, the thermal storage capacity of calcium-based materials decreases significantly during cycling, which is mainly attributed to high-temperature sintering and pore structure degradation. To address the aforementioned issues, this study synthesized acetic acid-modified Al 2 O 3 /MgO synergistically stabilized calcium-based thermal storage materials (Ca/Mg/Al molar ratios = 100:8:8, 100:8:10, 100:8:12, 100:8:14) via a wet blending method and investigated the effects of Al 2 O 3 /MgO doping ratios on the thermal storage performance. Results demonstrated that the optimal molar ratio of Ca:Mg:Al = 100:8:12 (labeled Ca 100 -Mg 8 -Al 12 ) exhibits a 90.81% improvement in cyclic stability of thermal storage compared to the unmodified Ca 100 sample. Microstructural characterization revealed that the calcium-based synthetic material possessed abundant micropores, smaller particle sizes, and a more uniform particle size distribution. The calcium-based synthetic material holds significant potential for broad applications in thermochemical energy storage systems.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Leibo Deng,Tianyi Li,Yahui Zhou,Wenjing Zhang
The harmless treatment of Cr-containing solid waste remains a critical environmental challenge. Herein, Cr 2 O 3 -doped CaO–MgO–Al 2 O 3 –SiO 2 glass-ceramics with varying Na 2 O contents were prepared via a melting method. The study focuses on how Na 2 O regulates the glass network, crystallization behavior, and Cr immobilization efficiency. With increasing Na 2 O content, the degree of depolymerization (DOD) of the parent glass increases from 1.76 to 1.99, while the crystallization activation energy decreases accordingly. The optimal formulation is achieved at 1 wt% Na 2 O combined with a two-stage heat treatment (nucleation at 720 °C for 2 h, followed by crystallization at 850 °C for 2 h). Under these conditions, the glass-ceramic exhibits the lowest Cr leaching concentration of 0.031 mg/L, far below the regulatory limit of 5 mg/L. The dominant crystalline phases are diopside and a spinel solid solution, where Cr 3+ is stably incorporated into the spinel. These findings demonstrate that controlled Na 2 O addition provides an effective compositional lever for optimizing both crystallization kinetics and heavy metal immobilization, offering a sustainable pathway for valorizing Cr-containing wastes into high-performance glass-ceramics.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 2
·118810
·
IF 6.3
Meicen Fan,Weiwei Xiao,Shile Chen,Yao Han,Yanhao Dong,Chang-An Wang
The advancement of flash sintering (FS) for insulating ceramics, such as Al 2 O 3 , has long been stifled by a persistent thermal-mechanical instability paradox: the extreme electric fields required for initiation inevitably trigger localized Joule heating and runaway densification, culminating in catastrophic structural failure. Herein, we report a DC electric field-assisted sintering paradigm that successfully decouples the beneficial electronic activation of a flash event from its destructive densification kinetics. By architecting a percolative TiC conductive skeleton, we lower the flash initiation threshold to an unprecedented 50 V·cm −1 . Crucially, an immediate transition to a current-controlled regime post-initiation effectively mitigates thermal runaway while sustaining a non-equilibrium, flash-activated state. This state, characterized by a dramatic surge in oxygen vacancies (
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Ziyuan Li,Mingsheng Luo,Zihan Xu,Lingxin Chen,Yuanyuan Fang,Hao Sun,Minwei Yi,Yutong Liu,Yiduo Huo,Roshni Rahman
In this study, in situ assembled MOFs on Al2O3-supported catalysts were prepared to compare with the traditional Al2O3-supported catalysts promoted with Ga and Mo for CO2 hydrogenation to methanol reaction. Among supported catalysts, the 5%MoZnCu/Al2O3 catalyst exhibited the highest CO2 conversion and methanol selectivity, while the 2.5%Mo-modified catalyst demonstrated the best performance among MOF-composited catalysts. MOF compositing can enhance the surface area and pore size of the catalyst, yielding increased CO2 conversion at 230 °C and 3.0 MPa. Meanwhile, Mo modification enhanced the methanol selectivity. Characterization data from XRD, Raman spectroscopy, and BET surface area analysis revealed that the crystal structure, surface morphology, pore structure, and metal valence distribution of the active components were influenced by the metallic promoters. This study provides valuable insights into catalyst development for efficient CO2 hydrogenation to produce methanol.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Mingli Han,Zhicheng Shi,Wenqiang Zhang,Kun Zhang,Huanlei Wang,Davoud Dastan,Runhua Fan
High dielectric permittivity materials are widely employed in various electronic devices. To satisfy the ongoing miniaturization of electronic devices, materials with further enhanced dielectric permittivities are strongly desired. In this work, a novel design of epoxy composites based on Ag/Al 2 O 3 /3D-BaTiO 3 foams with hierarchical heterogeneous microstructures are prepared. It is found that, the spatial distribution of the Ag particles can be easily controlled via adjusting the Ag + /Al 3+ mole ratios, yielding highly tailorable dielectric properties. When the Ag + /Al 3+ mole ratios are low, the Ag particles are well isolated by surrounding Al 2 O 3 , yielding the formation of numerous equivalent micro-capacitors and substantially enhanced dielectric permittivity. Moreover, the dielectric permittivities of the composites increase with higher Ag + /Al 3+ mole ratios. Consequently, a high dielectric permittivity of 160 @10 kHz, which is about 35 times that of the epoxy matrix, is achieved in the composite with a Ag + /Al 3+ mole ratio of 1.8. Meanwhile, a low tangent of about 0.062 is maintained. As the Ag + /Al 3+ mole ratio increases, the Ag particles become interconnected, forming Ag networks. Consequently, a plasma-like negative phenomenon which should be attributed to the plasma oscillation of free electrons in the percolative Ag networks, is observed. This work offers an effective route to design polymer composites with tailorable high permittivity and negative permittivity.
研究领域:
材料科学
·
电子工程
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Applied Catalysis O: Open
·
2024
·
IF 0
Zhe Zhang,Weiting Xiao,Yufei He,Dianqing Li,Xiaodong Zhao
During the manufacture of Al 2 O 3 , sulfate would be inevitably introduced when aluminum sulfate is used as raw material, but its effect has received little attention. In this work, Al 2 O 3 supports with different sulfate content were synthesized and used to prepare Pd/Al 2 O 3 catalyst. Sulfates in all samples exist as surface sulfate, and would be partially removed during the preparation process. Sulfate existing in Al 2 O 3 supports had little impact on the electric structure of Pd, but would partially block pores and also consume surface hydroxyl groups. As a result, higher sulfate content in support would lead to lower Pd dispersion in catalysts and slower reaction rate towards the hydrogenation of amyl-anthraquinone.
研究领域:
材料科学
·
催化化学
·
物理化学
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MATERIALS LETTERS
·
2023
·
IF 3
Junming Chen,Yibin Dou,Ruyi Zhao,Yunchao Lu,Longquan Liu
Hollow microlattice material is a kind of excellent heat insulation material due to its special microstructural characteristics and ultra-low relative density. However, the possibility of oxidation at the temperature higher than 500℃ limits its application in the high-temperature insulation fields, such as rockets and aircraft engines. In order to overcome this obstacle, this study successfully prepared nano-Al 2 O 3 reinforced metallic hollow microlattice materials with an equivalent density of 26.5 mg/cm 3 . Heat insulation tests and thermogravimetric (TG) experiments were also carried out to investigate the thermal performances of the Al 2 O 3 reinforced metallic hollow microlattice materials, while the effect of the concentration of the Al 2 O 3 was also investigated in accordance with the comparative tests. The results indicate that the Al 2 O 3 plays a significant role in hindering the high-temperature oxidation of hollow microlattice material, especially with Al 2 O 3 concentration in the range of 2 g/L to 4 g/L, and the heat insulation performance can be improved by 13.9%.
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SOLID STATE IONICS
·
2014
·
IF 2.112
Jing Yang,Zhen Huang,Bingxin Huang,Jing Zhou,Xiaoxiong Xu
NASICON-type structure lithium ion conductors have been considered as promising solid electrolytes due to its very high Li + -ion conductivity and chemical stability. In this paper, NASICON-type structured Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) glass–ceramics are prepared from crystallization of glass powders, which are obtained by a simple melt-quench method. NH 4 H 2 PO 4 , H 3 PO 4 , P 2 O 5 and H 3 PO 4 &Al(PO 3 ) 3 are used as phosphorus sources, respectively. The obtained LAGP glass–ceramics are systematically characterized with X-ray diffraction, field emission scanning electron microscopy , differential scanning calorimetry and AC impedance spectroscopy . The different impurities are formed depending on the phosphorus sources, which further influence the microstructure. As a result, the lithium ion conductivity is significantly affected by the phosphorus sources. The highest conductivity of 5.21 × 10 − 4 S·cm − 1 is obtained when H 3 PO 4 is used as the phosphorus source under optimum conditions.
研究领域:
材料科学
·
固态离子学
·
无机非金属材料
·
能源材料
·
电化学
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ENERGY CONVERSION AND MANAGEMENT
·
2019
·
IF 7.181
Zhong Ma,Shuai Zhang,Rui Xiao
The Fe 2 O 3 -Al 2 O 3 oxygen carrier is regarded to a promising candidate for chemical looping combustion (CLC). However, Fe 2 O 3 -Al 2 O 3 oxygen carrier was often subjected to a decrease of oxygen carrying capacity. The deactivation mechanism of Fe 2 O 3 -Al 2 O 3 oxygen carrier in chemical looping combustion was investigated over consecutive 20 cycles. The Fe 2 O 3 -Al 2 O 3 oxygen carrier exhibited relatively poor redox stability in a fixed bed reactor. The physico-chemical properties of cycled Fe 2 O 3 -Al 2 O 3 oxygen carrier were characterized by different characterization methods. No carbon deposit was detected in the reduction process, indicating that carbon deposition was not the cause for Fe 2 O 3 -Al 2 O 3 oxygen carrier deactivation under this experimental condition. The characterization results showed that the deactivation of Fe 2 O 3 -Al 2 O 3 oxygen carrier in redox cycles was mainly attributed to thermal sintering. The cycled Fe 2 O 3 -Al 2 O 3 oxygen carrier showed lower surface area, lower reducibility and oxygen mobility than that of fresh sample. After a certain number of redox cycles, Fe diffusion and enrichment at the surface of cycled oxygen carrier was observed. The surface Fe is unstable under high reaction temperature, leading to accelerate thermal sintering. A deactivation mechanism of Fe 2 O 3 -Al 2 O 3 oxygen carrier in CLC was proposed based on the Fe diffusion and surface sintering.
研究领域:
化学工程
·
能源技术
·
材料科学
·
催化
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Nano Energy
·
2017
·
IF 12.343
Wen Liu,Xifei Li,Dongbin Xiong,Youchen Hao,Jianwei Li,Huari Kou,Bo Yan,Dejun Li,Shigang Lu,Alicia Koo,Keegan Adair,Xueliang Sun
LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM) is a highly potential cathode material for lithium-ion batteries (LIBs). However, its poor rate capability and cycling performance at high cutoff voltages have seriously hindered further commercialization. In this study, we successfully design an ultra-thin lithium aluminum oxide (LiAlO 2 ) coating on NCM for LIBs. Compared to Al 2 O 3 , the utilization of lithium-ion conducting LiAlO 2 significantly improves the NCM performance at high cutoff voltages of 4.5/4.7 V. The study reveals that the LiAlO 2 -coated NCM can maintain a reversible capacity of more than 149 mA h g −1 after 350 cycles with 0.078% decay per cycle. Furthermore, LiAlO 2 -coated NCM exhibits higher rate capacities [206.8 mA h g −1 at 0.2 C (50 mA g −1 ) and 142 mA h g −1 at 3 C] than the Al 2 O 3 -coated NCM (196.9 mA h g −1 at 0.2 C and 131.9 mA h g −1 at 3 C). Our study demonstrates that the ultra-thin LiAlO 2 coating is superior to Al 2 O 3 and significantly improves the capacity retention and rate capability of NCM for LIBs.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Xinglin Wen,Ye Zhu,Yong Pan,Yonglu Yang,Xiaoyue Wan,Ahmed Mebarki,Juncheng Jiang
The direct hydrogenation of 2,4-dinitrotoluene (2,4-DNT) to 1-methyl-2,4-cyclohexanediamine (2,4-MCHD) represents a significant yet non-industrialized green process for synthesizing methylcyclohexane diisocyanate (HTDI), known for its excellent properties. This process faces considerable challenges due to the hydrogenation of the benzene ring, the reduction of two nitro groups, and the need to avoid deamination reactions. In this study, an alkali-free heterogeneous catalytic system was developed for the direct hydrogenation of 2,4-DNT to 2,4-MCHD using Ru nanoclusters supported on γ-Al 2 O 3 . Side reactions such as deamination were effectively inhibited, resulting in a 2,4-MCHD selectivity exceeding 95% and a 2,4-DNT conversion greater than 99%. Kinetic studies indicated that the hydrogenation of 2,4-DNT in this system operates as a tandem reaction, with the hydrogenation of the benzene ring serving as the rate-determining step. Structure-activity relationship studies demonstrated that the valence state of Ru nanoclusters, the acidity and basicity of the catalyst, and the synergistic effect between Ru and the support significantly influence catalytic performance. This work represents the first example of the direct hydrogenation of dinitroaromatic compounds to aliphatic diamines in a system that does not require the addition of alkali elements, thereby establishing a solid foundation for the further exploration of such reaction systems.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9
Beibei Liu,Zhigang Wang,Xiaoyao Tan
Compared to organic nanofiltration (NF) membranes, ceramic NF membranes exhibit higher stability under harsh conditions such as extreme pH and elevated temperatures. γ-Al 2 O 3 is commonly employed as an interlayer in multilayer ceramic NF membranes, but it is restricted to relatively mild conditions. In this study, on a macroporous alumina hollow fiber support, a boehmite sol coating is transformed from γ-Al 2 O 3 to α-Al 2 O 3 at a reduced phase-transformation temperature under the induction of TiO 2 , forming a uniform ultrafiltration interlayer for the fabrication of SiO 2 -ZrO 2 separation layer in a single step. By dual regulating the TiO 2 doping content in boehmite sol and sintering temperatures, the resulting SiO 2 -ZrO 2 /α-Al 2 O 3 NF membrane with a pore size of 1.4 nm demonstrates extended stability across a wide pH range of 1–13 under elevated temperatures. During the long-term dynamic textile wastewater treatment test, it maintains stable permeance and selectivity for over 24 h at pH 2/12 under 60 °C, significantly outperforming γ-Al 2 O 3 -supported SiO 2 -ZrO 2 membranes. Meanwhile, it displays a permeance of up to 18 LMH/bar and superior dye desalination performance (CR: 99.23%, NaCl <12%). This optimization strategy not only enhances the stability of SiO 2 -ZrO 2 NF membranes with the aid of an α-Al 2 O 3 interlayer but also provides a simplified route for their fabrication.
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