CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Peize Lyu,Wenzhao Sun,Bo Yang,Wanqi Chen,Ruolan Tang,Haile Yan,Zongbin Li,Song Li,Liang Zuo
Magnéli-phase Ti 4 O 7 exhibits broadband photothermal conversion but suffers from rapid oxidation to optically inactive TiO 2 , severely restricting its deployment in high-temperature solar-thermal systems. Here, we demonstrate that Al doping provides an effective dual-function strategy to simultaneously enhance the oxidation resistance and optical stability of Ti 4 O 7 while maintaining its intrinsic photothermal performance. Al-doped Ti 4 O 7 powders (0–10 at. %) were synthesized via hydrogen reduction, and their structural evolution, oxidation kinetics, and spectral responses were systematically evaluated under controlled oxidative environments (300–500 °C, 2–10 h). Al 3+ incorporation induces lattice distortion and electronic localization, which increase oxygen migration barriers and suppress electron-assisted oxidation. During annealing, Al–O–Ti species progressively transform into Al–O–Al–enriched surface layers, forming a robust diffusion barrier that significantly retards the Ti 4 O 7 → TiO 2 conversion. As a result, the 10 at. % Al-doped sample retains a high solar absorptance of 95.8% after 400 °C/10 h oxidation, outperforming undoped Ti 4 O 7 (92.2%). Moreover, controlled oxidation produces Ti 4 O 7 @TiO 2 core–shell structures with statistically enhanced near-infrared absorption arising from multiple interfacial reflections and scattering–induced phase accumulation. Kinetic analysis confirms reduced oxidation rates and increased activation barriers across the full temperature window. These results establish Al-doped Ti 4 O 7 as a durable, thermally stable photothermal material suitable for solar selective absorbing coatings, concentrated solar power receivers, and other high-temperature chemical engineering processes requiring long-term optical and structural robustness.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 16
·6792-6806
·
IF 3.5
Li Junguo,Yang Xuebin,Li Peibo,Zhang Yang,Luo Guoqiang,Shen Qiang,Sun Yi
Owing to inadequate interface contact between carbon and aluminum, enhancing the Al/C interface is crucial for the fabrication of high-performance Al matrix composites. This study selected polyvinyl butyral (PVB) with excellent dispersion properties as the carbon source, simultaneously introducing silver to achieve synergistic reinforcement between silver and carbon in Al matrix composites, offering a novel reinforcement approach for Al matrix composites. The Al–16Ag–C composite is fabricated through the in situ pyrolysis of PVB followed by hot-pressing sintering. Subsequently, the effect of temperature on the microstructural evolution and mechanical properties of the composite is investigated. Microstructural characterization demonstrates the formation of two alloy phases, namely Ag 2 Al and Al 4 C 3 , within the Al–16Ag–C composite. The alloy phases, distributed at the grain boundaries, enhance the material’s strength by impeding dislocation motion, increasing dislocation density within the matrix, and limiting grain growth. The Al–16Ag–C composite, sintered at 630 °C, exhibits a remarkable ultimate tensile strength of 481 MPa and an elongation of 16.84%, representing a significant enhancement compared to pure Al.
研究领域:
材料科学
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机械工程
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HIGH PRESSURE RESEARCH
·
2012
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IF 0.778
Yu Li,Zili Kou,Haikuo Wang,Kaixue Wang,Hongchang Tang,Yanfei Wang,Shenzhuo Liu,Xiangting Ren,Chuanming Meng,Zhigang Wang
The sintering behavior and mechanical properties of cubic boron nitride (cBN) composites, using the mixture of cBN–Ti3Al and cBN–Ti3Al-Al as the starting material respectively, were investigated under high pressure and high temperature (HPHT) conditions. The results show that the samples of cBN–Ti3Al-Al sintering system have more homogeneous microstructures. Young's modulus, shear modulus, and bulk modulus of samples measured by ultrasonic measurements can reach to 782±3 GPa, 344±1 GPa, and 348±2 GPa, respectively. The hardness increases remarkably with the sintering temperature rising, and reaches to the highest value of 35.04±0.51 GPa. For the cBN–Ti3Al sintering system, the X-ray diffraction patterns of composites reveal that the chemical reactions between cBN and Ti3Al occurred at 5.0 GPa and 1300°C. The reaction mechanisms of both cBN–Ti3Al and cBN–Ti3Al-Al sintering systems are discussed in this paper.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Shuyang Shi,Baozhong Ma,Ding Zhao,Xiang Li,Shuang Shao,Chengyan Wang,Yongqiang Chen
The new process ‘coal gangue/fly ash – HNO 3 pressure leaching (NAPL) –low-temperature pyrolysis’ was proposed by our team, which aimed to achieve the transformation of coal-based solid wastes from harmless to Al resource. For cost control, the regeneration of HNO 3 at a low cost was crucial for the process. Following NAPL of coal gangue and fly ash, massive amounts of Al(NO 3 ) 3 ·9 H 2 O were collected, with a decomposition temperature as low as 523 K. The energy consumption for low-temperature pyrolysis could be supplied by the combustion of residual carbon (6.96 wt%) during the thermal activity of coal gangue, allowing HNO 3 to be regenerated and recycled without extra heat supply . However, little research has been done on the pyrolysis behavior and kinetics of Al(NO 3 ) 3 ·9 H 2 O, which was examined in this study. The pyrolysis characteristics of Al(NO 3 ) 3 ·9 H 2 O were assessed by TG-DSC analysis. Further experiments and XRD/FTIR/MS analysis revealed that phase evolution of Al(NO 3 ) 3 ·9 H 2 O followed the sequence of Al(NO 3 ) 3 ·9 H 2 O→ Al(NO 3 ) 3 ·nH 2 O→ Al(NO 3 ) 3 ·3Al(OH) 3 ·5/2 H 2 O→ AlOOH→ Al 2 O 3 . Subsequently, the thermodynamic (∆ G , ∆ H , ∆ S ) and kinetic ( E a , A ) parameters were calculated based on the thermogravimetric data by the iso-conversional methods. And the mechanism models and functions were identified via the Malek method. Finally, the economic evaluation of pyrolysis indicated that 5.04 × 10 –3 Nm 3 of natural gas was consumed during pyrolysis of one mole Al(NO 3 ) 3 ·9 H 2 O, equivalent to 44.33 $ per ton of Al 2 O 3 . As a basic research of Al(NO 3 ) 3 ·9 H 2 O pyrolysis, this paper enhances related theories of the NAPL process.
研究领域:
材料科学
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热工工程
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无机化学
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废弃物资源化
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过程工程
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高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Qian Luo,Runyu Wang,Kai Lu,Hang Liu,Guocai Yuan,Juncheng Ding,Xiaobo Lei,Ruonan Min,Qinyong Zhang,Lihong Huang
PbSe has attracted significant attention as a medium-temperature thermoelectric (TE) material due to its abundance and low cost. This study demonstrate that in the novel thermoelectric system of Al x Pb 0.9975 Sb 0.0025 Se samples ( x = 0, 0.005, 0.01, 0.02, and 0.03), the electronic conductivity of pure PbSe was enhanced by Sb doping. Introducing a small amount of Al to occupy the Pb vacancies not only increases the Hall carrier concentration in PbSe, but also resulting in an increase in Seebeck coefficient ( S ). At 873 K, the power factor ( PF ) of the sample with x = 0.02 increases to 16 μW cm −1 K −2 . In addition, the total thermal conductivity did not increase significantly, so the thermoelectric performance was effectively improved, a maximum figure of merit ( ZT ) of 1.8 is achieved at 873 K, along with a high average ZT ( ZT avg ) of approximately 1 over the temperature range of 300–873 K.
研究领域:
材料科学
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热电学
·
能量转换
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121220
·
IF 7.2
Mengjiao Yu,Xiong-Fei Zhang,Mengjie Li,Jianan Song,Jianfeng Yao
The valorization of cellulose into valuable platform chemicals necessitates efficient and sustainable catalytic systems, where the acid-base properties of catalysts are critical for directing reaction pathways. This work presents the one-pot synthesis of a series of aluminum-based metal-organic frameworks (MIL-53) with tunable acid-base functionalities, achieved by modulating organic linkers. The successful formation of cooperative acid-base sites was confirmed by comprehensive characterization, including X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and pyridine adsorbed infrared spectra. Catalytic performance evaluations demonstrated that acid-base cooperative sites significantly enhance the oriented conversion of cellulose to 5-hydroxymethylfurfural (5-HMF). Under optimal conditions (190 °C, 8 h) in a tetrahydrofuran (THF)/NaCl-H 2 O biphasic system, MIL-53-NH 2 /SO 3 H yielded 63.8 % 5-HMF, 6.3 % levulinic acid (LA), and 23.9 % formic acid (FA). The catalytic transformation of cellulose is a cascade process encompassing hydrolysis of cellulose to glucose, isomerization of glucose to fructose, dehydration to 5-HMF, and rehydration of 5-HMF to LA and FA. These results provide a promising strategy for designing efficient acid-base bifunctional catalysts for biomass conversion.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.6
Tingting Lei,Yating Xu,Siyi Tan,Jiafu Xiao,Shaojing Zhao,Minhuan Lan
The widespread use of chlortetracycline (CTC) in agriculture and aquaculture has raised significant concerns regarding environmental contamination and human health risks. There is a critical demand for developing rapid, sensitive, and selective detection techniques for CTC identification. In this study, we introduced a smartphone-integrated ratiometric fluorescent sensor utilizing Al-doped carbon dots (Al-CDs), which were synthesized through a straightforward one-pot hydrothermal method. CTC quenches Al-CDs' fluorescence at 400 nm via the inner filter effect. Concurrently, a distinct fluorescence signal at 500 nm emerged, resulting from the enhanced intrinsic fluorescence of CTC upon its chelation with Al 3+ on the surface of Al-CDs. This ratiometric fluorescence spectral response enables a visible color shift from blue to green upon UV irradiation. The constructed sensor achieves a remarkable detection limit of 0.17 μM and displays exceptional specificity toward CTC among other antibiotics, metal ions and amino acids. Successful application in real water samples yielded satisfactory recovery rates (98.5–110.6%), highlighting the potential of this smartphone-integrated platform for on-site and quantitative CTC detection.
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PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 15
·8301-8312
·
IF 3.917
Li Xiangping,Liu Juping,Zhang Jianguang,Liu Bin,Ma Wenchao,Wang Chuanbin,Chen Guanyi
Lignocellulosic biomass-derived bio-oil is considered as a promising renewable biofuel. In this paper, incipient wetness impregnation method, ammonia grafting method and direct synthesis method were employed as nickel loading methods for the preparation of Ni/Al-SBA-15 catalysts. The effects of these nickel loading approaches on the structure and hydrodeoxygenation performance of Ni/Al-SBA-15 were studied. The structure of Ni/Al-SBA-15 was significantly influenced by the nickel loading methods, including the specific surface area, the pore volume, the wall thickness and so on. Nickel loading methods also affected the actual nickel content of nickel-based catalysts. Unsuccessful loading of nickel species was observed during the preparation of Ni/Al-SBA-15 using direct synthesis method. The conversion of eugenol and selectivity of products after hydrodeoxygenation in n -dodecane over Ni/Al-SBA-15 catalysts were investigated. Results showed that the conversion of eugenol nearly reached 100% for all the reaction, but the composition of product was significantly different when using different Ni/Al-SBA-15 as hydrodeoxygenation catalyst. The reaction pathway of eugenol hydrodeoxygenation in n -dodecane was also speculated in this paper. Graphic Effects of nickel loading approaches on the structure and hydrodeoxygenation performance of Ni/Al-SBA-15 were investigated. For the liquid phase hydrodeoxygenation of eugenol to hydrocarbon, catalysts prepared by ammonia grafting method exhibited the highest catalytic activity.
研究领域:
催化化学
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可再生能源
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生物质转化
·
材料科学
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高影响因子
Mineral Processing and Extractive Metallurgy Review
·
2017
·
IF 1.219
Wencui Chai,Yanfang Huang,Guihong Han,Jiongtian Liu,Shuzhen Yang,Yijun Cao
In order to remove aluminum ions in bauxite processing wastewater, two natural clay minerals (bentonite and kaolin) were used as adsorbents. The adsorption behaviors including kinetics and isotherms were studied at much broader pH range, higher temperature, and higher Al(III) concentration by batch experiments. The adsorption mechanisms were investigated by optical microscope, zeta potential testing, and XRD analysis. The results show that Al(III) adsorption is strongly pH dependent and increases clearly with increasing pH. The pseudo-second-order kinetic model can best describe the adsorption process, and the intra-particle diffusion was not the sole rate-controlling step. The Langmuir–Freundlich model can fit best the adsorption equilibrium data, and the maximum capacities of Al(III) adsorbed on bentonite and kaolin reach to 8.52 mg g–1 and 0.58 mg g–1, respectively, at 35°C. Thermodynamic studies display that the adsorption of Al(III) onto clay minerals is non-spontaneous. The adsorption of Al(III) onto bentonite is endothermic and causes an increase in the entropy, while kaolin is exothermic and causes a decrease in the entropy. The interaction mechanisms of Al(III) with bentonite and kaolin involve electrostatic attraction, cation exchange, surface complex, and precipitation. Bentonite as adsorbent has more potential to remove Al(III) than kaolin.
研究领域:
环境科学
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吸附技术
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废水处理
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黏土矿物学
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化学工程
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高影响因子
Journal of Manufacturing Processes
·
2020
·
IF 4.086
Xiaoping Cai,Keer Li,Changcheng Sang,Xuanru Ren,Leihua Xu,Peizhong Feng
The dissimilar metals joining of Ti/Cu was conducted using a rapid thermal explosion (TE) reaction. The Ni-Al powder mixture was used as TE reaction system, and the effect of temperature (600, 700, 800 and 900 °C) on interfacial diffusions, microstructure and mechanical properties of Ti/Cu joint were investigated. The maximum combustion temperature of Ni-Al interlayer during heating process was 720 °C and a significant exothermic phenomenon was observed for 5 s. The infiltration of melted Al into the Ti/Cu substrate and formed a continuous transition region at the interface of the joints were the dominant joining mechanisms. Microhardness of the interlayer after heated at 900 °C for 30 min possessed prominent improvement from 32.6 to 101.7 HV due to the completely phase transformation of Ni-Al interlayer, which composed of main phase NiAl and minor phase Ni 3 Al. The bond strength of the joint was checked to assess the joint quality. For the joint processed by 900 °C for 30 min, the maximum shear strength of Ti/NiAl and Cu/NiAl were 33.4 MPa and 39 MPa, respectively.
研究领域:
材料科学
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连接技术
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金属间化合物
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微观结构分析
·
力学性能
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Chuandong Wu,Pan Fang,Guoqiang Luo,Fei Chen,Qiang Shen,Lianmeng Zhang,Enrique J. Lavernia
We report on a study on the influence of Plasma activated sintering (PAS) parameters on the microstructure and mechanical properties of aluminum matrix composites (AMCs). In this paper a commercial Al alloy (7075) reinforced with 7.5 wt.% B 4 C were synthesized using PAS. Specifically, we studied the influence of temperature, in the range of 450 °C to 540 °C, and holding time on the densification behavior of Al-7075/B 4 C composites. Moreover, the influence of residual porosity on mechanical properties of Al-7075/B 4 C composites was established via measurements of Vickers hardness, bending and compressive strength. High mechanical properties including Vickers hardness 181.6 HV, bending strength 1100.3 MPa, high compression yield strength 878.0 MPa and fracture strength 469.3 MPa of the consolidated Al-7075/B 4 C composite sintered at 530 °C for 3 min were achieved and attributed to a fully dense microstructure and a strong interface between matrix and reinforcement.
研究领域:
材料科学
·
金属基复合材料
·
粉末冶金
·
固态加工
·
力学性能表征
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高影响因子
Carbon Resources Conversion
·
2026
·
IF 10.9
Zhixing Li,Fei Wang,Yanchao Liu,Jinghong Ma,Kai Bian,Xinwei Zhang,Yanze Du,Ruifeng Li
The efficient conversion of C 9 heavy aromatics into high-value benzene, toluene, and xylenes (BTX) products is essential for optimizing petroleum refining. This process often depends on both diffusion and the unresolved relationship among structure, acidity, and reactivity of zeolite catalysts. This study focuses on the intracrystalline micro-/ meso -pores in ZSM-5 and decouples the interdependent effects of crystalline morphology and Al distribution of Brønsted acid sites (BAS) in ZSM-5 on C 9 aromatic conversion pathways. The hierarchical ZSM-5 catalysts have the identical SiO 2 /Al 2 O 3 ratios (SAR) and the different distribution of framework Al-species. This dominates the acid distribution of the zeolites and catalytic performances of the catalysts in C 9 aromatic reaction. In toluene/trimethylbenzene (TMB) transalkylation, the hierarchical porosity coupled with reduced crystallite size of the ZSM-5 enhances 1,2,4-TMB conversion by 24.4% and xylene selectivity by 17.9% versus conventional microporous ZSM-5. The product distribution is positively correlated to the concentration of Al atoms localized at channel intersections of the ZSM-5. Diffusion-decoupled experiments demonstrated acid site spatial configuration in the ZSM-5 governs the reaction pathway selection, with aluminum enrichment at channel intersections favoring transalkylation over disproportionation. The hierarchical ZSM-5 in submicron with intracrystalline mesopores and enriched intersection-channel aluminum favors transalkylation of C 9 aromatics to BTX. The hierarchical ZSM-5, with submicron crystallites, intracrystalline mesopores, and enriched intersection-channel aluminum, enhances transalkylation of C 9 aromatics to BTX.
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