Arabian Journal of Chemistry
·
2022
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IF 6.212
Run Yuan,Yihe Qin,Can He,Zichen Wang,Lu Bai,Hong Zhao,Zijian Jiang,Lingyao Meng,Xuwen He
It is important to develop a catalyst that has high catalytic activity and can improve the degradation efficiency of refractory organic pollutants in the catalytic ozonation process. In this study, Fe-Mn-Cu-Ce/Al 2 O 3 was synthesised via impregnation calcination for catalytic ozonation of bio-treated coking wastewater. The physical and chemical characteristics of the catalysts were analysed using X-ray diffraction (XRD), X-ray fluorescence spectrometry (XRF), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller nitrogen adsorption–desorption methods. The effects of catalyst dosage, pH, and reflux ratio on the degradation efficiency of wastewater were examined in laboratory-scale experiments. The chemical oxygen demand (COD) removal rate of bio-treated coking wastewater was estimated to be 52.76 % under optimal conditions. The experiments on the catalytic mechanism demonstrated that the surface hydroxyl formed by the Lewis acid sites on the surface of the catalyst can react with ozone as the active site forming the active oxygen (·OH, ·O 2 – , and 1 O 2 ), thereby efficiently degrading the organic pollutants in coking wastewater. Furthermore, a pilot-scale experiment on the catalytic ozonation of bio-treated coking wastewater was carried out using an Fe-Mn-Cu-Ce/Al 2 O 3 catalyst, while the effects of the initial pollutant concentration, ozone concentration, and gas flow on the COD removal rate were studied on a pilot scale. It was found that the COD removal rate of the wastewater was ∼ 60 % under optimal parameters. After the treatment, the wastewater steadily reached the coking wastewater discharge standard (COD < 80 mg/L), while the operating cost of catalytic ozonation reached ∼ 0.032$/m 3 , thereby paving the way toward economic engineering applications. The COD degradation kinetics in the bio-treated coking wastewater followed pseudo-second-order kinetics. Three-dimensional fluorescence and gas chromatography–mass spectrometry revealed that macromolecular organic pollutants in the bio-treated coking wastewater were greatly degraded. In summary, Fe-Mn-Cu-Ce/Al 2 O 3 exhibited good reusability, high catalytic activity, and low cost and has a wide application prospect in the treatment of coking wastewater.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Zhurong Liang,Zhuoneng Bi,Kai Gao,Yifei Fu,Pengyue Guan,Xialei Feng,Zhisheng Chai,Gang Xu,Xueqing Xu
In common perovskite solar cells utilizing TiO 2 as electron transport layer, undesirable charge recombination at TiO 2 /CH 3 NH 3 PbI 3 interface is one of the crucial issues to the photovoltaic performance of the device. Moreover, exposure of TiO 2 under long-term solar illumination may also cause deep trap states at TiO 2 surface and seriously influence the device stability. Herein, we introduce an insulating ultra-thin Al 2 O 3 interfacial layer between the mesoporous TiO 2 film and perovskite layer. The power conversion efficiency of the solar cells fabricated via spray deposition in the air increased from 9.36% ( V oc = 0.86 V, J sc = 17.21 mA cm −2 , FF = 0.63) to 12.79% ( V oc = 0.93 V, J sc = 21.56 mA cm −2 , FF = 0.64). The significantly improved photovoltaic performance is mainly attributed to the efficient reduction of charge recombination. Meanwhile, the Al 2 O 3 -modified perovskite solar cells exhibit a strong stability under long-term light exposure compared with the common device without the Al 2 O 3 interfacial layer.
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高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·Vol. 33
·期 4
·1862-1873
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IF 2.3
Yan Huanyuan,Liu Wensheng,Ma Yunzhu,Wang Tao,Wu Lei,Yang Lun,Tang Siwei
In this work, Al 2 O 3 ceramic coatings were prepared the surface of powder metallurgy (PM) 2024 aluminum alloy via the micro-arc oxidation (MAO) technique. The effects of the current density and the oxidation treatment time on the microstructure and properties of the MAO coatings were investigated. The results reveal that the oxide film mainly comprises the γ-Al 2 O 3 phase, the amorphous Al 2 O 3 phase, and a small amount of the mullite phase. There are traces of W in the coatings, which exist in the form of W, WO 3 , and W 18 O 49 . With increasing current density, the thickness and surface roughness of the MAO coatings prepared on the PM 2024 alloy increase, while their surface hardness first increases and then decreases. The increase in the current density promotes the transformation of the amorphous Al 2 O 3 phase into the γ-Al 2 O 3 phase. The maximum hardness value of 1270 HV is obtained at a current density of 20 A dm −2 . The MAO coatings provide superior corrosion protection for the PM 2024 aluminum alloy, and the MAO coatings obtained at a current density of 15 A dm −2 exhibit the highest corrosion resistance.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zixian Wang,Yajun Li,Kai Yang,Yufan Gu,Mingxuan Gu,Limei Pan,Jian Gu,Jian Yang
In this work, high-continuity nano-Cr 2 O 3 films were fabricated on the Al 2 O 3 ceramic substrate surface via the evaporation-induced self-assembly (EIA) method, aiming at decreasing the secondary electron emission yield (SEEY) and increasing the vacuum withstand voltage performance of Al 2 O 3 ceramic for application in electric vacuum devices. The effects of ethylene glycol monomethyl ether (MOE) addition and calcination temperature on the composition, structure, and various properties of the nano-Cr 2 O 3 films were investigated, and the related mechanisms were discussed. Employing MOE and increasing its addition significantly mitigated internal stress during the liquid film formation and crack-free nano-Cr 2 O 3 films were achieved at 15% addition. With the calcination temperature increasing from 300 °C to 1000 °C, the crystallinity, uniformity, and compactness of the film were improved, while the defect states decreased, resulting in an increase in bandgap, surface resistivity, and decrease in SEEY, presenting the particularity of Cr 2 O 3 . When calcined at above 1000 °C, the Cr 2 O 3 film gradually dissolved into the Al 2 O 3 substrate, which led to the increase in bandgap, surface resistivity and SEEY, approaching the intrinsic characteristics of Al 2 O 3 at 1500 °C. The nano-Cr 2 O 3 film calcined at 1000 °C exhibits optimized comprehensive structure characteristics, moderate surface resistivity (1.30×10 16 Ω/□), the lowest SEEY (2.27), and presenting a much improved and impressive vacuum flashover voltage strength of 65 kV/cm.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yuhan Cui,Songyin Yu,Zhichao Sun,Hongyu Niu,Changhai Liang,Chuang Li
Selective hydrogenation of fatty esters to high-value fatty alcohols is highly desirable for the utilization of natural oils. However, the hydration reaction of the support and hydrolysis reaction of the C–O bond can affect the selectivity of the targeted alcohol. Herein, core–shell Al2O3@Cu2Zn1-LDO is prepared via the in situ growth of CuZnAl-LDHs on Al2O3 microsphere substrates, followed by a calcination–reduction process. The catalyst achieves a methyl laurate (ML) conversion of 95% and selectivity of 98% for lauryl alcohol (LA) under mild conditions (4 MPa of H2 and 240 °C). In addition, the three-dimensional (3D) hierarchical structure of the Al2O3@Cu2Zn1-LDO catalyst enhances mass diffusion and transport, significantly improving catalytic performance and exhibiting excellent stability in the hydrogenation of fatty esters to fatty alcohols. The hydration reaction between Al2O3 and H2O produced during the hydrogenation of fatty acid esters is prevented successfully. Therefore, this work provides a new approach for designing newly structured Cu-based catalysts for the highly selective synthesis of fatty alcohols from natural oils.
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高影响因子
FUEL
·
2025
·
IF 7.5
Danni Ren,Xiaoguo Zhang,Wei Lu,Ziyi He,Meng Yang,Xiaodong Luo,Shenfu Yuan
Ni-Fe bimetallic catalysts demonstrate high catalytic activity and strong resistance to deactivation during biomass steam reforming (BSR). However, their activation and reaction with steam (H 2 O) are complex, and a deeper understanding of the underlying mechanisms is crucial for enhancing catalyst stability. This study systematically investigates the influence of H 2 O on the deactivation mechanisms of Ni-Fe/Al 2 O 3 catalysts, focusing on its dual role in modulating carbon deposition patterns and triggering metal particle sintering. Our experimental results reveal a paradoxical effect of steam: the introduction of H 2 O reduces the total amount of carbon deposits, it promotes the formation of structurally disordered carbon. Crucially, this disordered carbon is identified as the primary driver of catalyst deactivation. It not only physically blocks active sites but also accelerates the sintering of metal particles, leading to profound alterations of the catalyst’s surface architecture and a consequent loss of performance. Combining experimental results and DFT calculations, we reveal the energy barriers for carbon evolution and correlate them with catalytic stability. These insights provide a theoretical foundation for improving the deactivation resistance of the catalyst, controlling the structural type of carbon deposits, and optimizing the anti-sintering performance of the etallic catalysts.
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高影响因子
OPTICS AND LASER TECHNOLOGY
·
2025
·
IF 5
Lingjun Zhou,Panyi Wang,Tenglong Sun,Yanan Chen,Muzhi Cai,Wenyan Zheng,Feifei Huang,Ying Tian,Liaolin Zhang,Junjie Zhang
Tellurite glasses with the composition 67TeO 2 -3Al 2 O 3 -xZnO-(30-x)Na 2 O (x = 0–20 mol%) were synthesized via melt-quenching. Raman analysis revealed Al/Zn synergistically strengthened the network via Al-O-Te/Zn-O-Te bonds below 15 mol% ZnO, whereas excess ZnO triggered Zn 2+ /Al 3+ site competition, reducing crystallization resistance. The glass with 15 mol% ZnO (TANZ) shows optimal thermal stability ( T g = 311 °C, ΔT = 139 °C) and serves as the host for obtaining mid-infrared emission. The Ho 3+ /Yb 3+ co-doped TANZ glass shows high absorption and emission cross-sections of 7.36 × 10 –21 cm 2 and 5.86 × 10 –21 cm 2 , respectively, along with a long lifetime of 1.33 ms at 2 μm. These results highlight the potential of TANZ glasses as robust gain materials for mid-infrared fiber lasers.
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高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Chao Dou,Shengqiang Liu,Fangyi Zhao,Zhen Song,Quanlin Liu
The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development of phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, the application of most known violet-excitable blue-emitting phosphors is limited by their low external quantum efficiency (EQE). In this work, we reported on how the EQE values of Eu2+-doped Ba(K)-β-Al2O3 blue-emitting phosphor can be significantly improved through lattice site engineering. By partially substituting K+ for Ba2+, the Eu2+-occupied crystallographic site changes and the coordination polyhedron of Eu2+ shrinks, leading to the increase of crystal field splitting. Consequently, the excitation spectrum exhibits a continuous red shift to match the violet excitation, which enhances the PL intensity of solid solution phosphor (Ba0.4K1.6)0.84Al22O35−α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) by 1.42 times compared to that of the end-member Ba1.68Al22O35−α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under the 400 nm violet light excitation, the EQE of optimal blue-emitting (B0.4K1.6)0.84AO:Eu phosphor is up to 53%. Additionally, the phosphor also shows excellent resistance to luminescence thermal quenching (95% at 150 °C). Finally, the WLED fabricated based on (B0.4K1.6)0.84AO:Eu and commercial green and red phosphors exhibited an ultra-high color rending index with Ra = 95.5 and R1–R15 >90. This work offers guidance for tuning the spectral properties of phosphors through lattice site engineering.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Fucheng Liu,Yuhui Chen,Lei Zhuang,Hui Wang,Hulei Yu,Yanhui Chu
High-temperature materials with superior long-term oxidation resistance above 2000 °C are urgently sought for next-generation hypersonic vehicles. Here, (W 0.28 Ta 0.28 Mo 0.28 Cr 0.15 )(Al 0.2 Si 0.8 ) 2 -Al 2 O 3 dual-phase high-entropy alumino-silicides (HEAS-Al 2 O 3 ) are developed, which exhibit superior long-term oxidation resistance up to 2100 °C. To be specific, the as-fabricated HEAS-Al 2 O 3 samples are found to consistently follow an oxygen-diffusion parabolic law across 1700–2100 °C, possessing a high activation energy of 234.4 kJ mol −1 . Moreover, an ultralow oxidation depth of 0.4 mm after 120 min of laser oxidation and a linear plasma ablation rate of 0.026 μm s −1 at 2100 °C are achieved. Such remarkable oxidation resistance is mainly attributed to the increase in Al cations due to Al 2 O 3 incorporation, coupled with the inclusion of multiple cationic elements, to significantly enhance the rigidity of the glass network. Thereby, the viscosity and high-temperature stability of the resulting aluminosilicate glass are markedly improved, effectively protecting the underlying unoxidized HEAS-Al 2 O 3 . The as-developed HEAS-Al 2 O 3 shows great promise as a thermal structural candidate for next-generation hypersonic vehicles.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Tianyu Zhang,Dong Han,Wenkang Yi,Zhihong Wang,Ruina Ma,An Du,Yongzhe Fan,Xue Zhao,Xiaoming Cao
Achieved coatings exhibiting coexistence of crystalline and amorphous SiO 2 phases. • Revealed the three-dimensional distribution and phase composition of coating pores. • Elucidated the mechanism by which SiO 2 coatings influence thermal management performance. • I corr is reduced by more than two orders of magnitude compared to the matrix. This study addresses the insufficient thermal stability and corrosion resistance of 7075 aluminium alloy by employing staged voltage-boosted plasma electrolytic oxidation (PEO) technology to fabricate an ultra-thick composite coating containing amorphous/crystalline SiO 2 within an organosilicon electrolyte. The system investigated the regulation mechanisms of duty cycle on coating phase composition, microstructure, thermal control performance, and corrosion resistance. Utilising advanced characterisation techniques such as Grazing Incidence X-Ray diffraction, X-ray computed tomography, and X-ray photoelectron spectroscopy, its underlying mechanisms were elucidated. By modulating energy input, the duty cycle significantly influenced coating growth, achieving a maximum thickness of 181.76 μm-far exceeding conventional PEO coating thickness levels. XCT analysis revealed the phase distribution and pore characteristics of the coating at a 20% duty cycle. Pores with diameters between 0 and 5 μm constituted the highest proportion (approximately 68.85%), while interconnected pores exceeding 30 μm in diameter dominated the total pore volume. Optimal thermal management performance was observed at a 30% duty cycle (absorptance 0.36, emissivity 0.89), confirming a critical thickness threshold (130 μm) and the pivotal role of amorphous SiO 2 . Corrosion resistance peaked at a 10% duty cycle, with corrosion current density reduced to 2.368 × 10 −8 A·cm −2 , representing a near two-order-of-magnitude decrease compared to the substrate. Download: Download high-res image (349KB) Download: Download full-size image
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2026
·
IF 6.5
Hanrui Ma,Guangzhe Zhang,Zimeng Han,Tong Hao,Yuxin Li,Kunjie Li,Ruihong Zhao,Jiangze Han,Jingsi Yang
A Ni–Ca–Al 2 O 3 composite catalysts was developed for synergistic biomass gasification tar cracking and CO 2 fixation. • The 10Ni-Ca-Al catalyst exhibited the optimal catalytic performance, achieving a 139.2% enhancement in H 2 yield. • The catalyst showed good durability, with H 2 yield retaining 81.1% after five cycles. • Mechanistic studies further confirmed the synergistic effects among NiO, CaO, and Al 2 O 3 . Biomass gasification is a promising technology for renewable hydrogen production; however, its practical application is constrained by high tar yield and insufficient hydrogen yield. In this study, Ni-Ca-Al 2 O 3 composite catalysts were prepared and applied in a two-stage fixed-bed gasification system to enhance hydrogen production from biomass gasification through the synergistic effects of tar reforming and in-situ CO 2 adsorption. The influences of catalytic temperature, catalyst dosage, and NiO loading on gas composition, tar conversion, and catalyst stability were systematically investigated. The results show that hydrogen yield gradually increased with rising catalytic temperature. Increasing the catalyst dosage further promoted CO 2 capture and tar cracking, thereby enhancing H 2 production. The incorporation of NiO significantly improved catalytic activity, which was attributed to its acceleration of tar reforming, methane steam reforming, and the water–gas shift reaction. Among the catalysts studied, 10Ni–Ca–Al exhibited the best overall performance. Under optimal conditions (600 °C, 5 g catalyst), the gasification of pear branches resulted in increases of 108.7% in H 2 concentration and 139.2% in H 2 yield compared with the blank experiment, accompanied by a substantial reduction in tar yield to 3.6 g/kg and a tar cracking ratio of 79.7%, with a CO 2 adsorption capacity reaching 170 mg/(g cat). Characterization results confirmed that CaO effectively adsorbed CO 2 to form CaCO 3 , while NiO was reduced to metallic Ni; the synergistic interaction between the two components promoted tar cracking and enhanced H 2 yield. Cyclic stability tests demonstrated that the catalyst maintained good catalytic activity after five regeneration cycles. In summary, the Ni–Ca–Al 2 O 3 catalyst, through the dual-function coupling of tar cracking and in-situ CO 2 adsorption, provides a viable strategy for efficient hydrogen production from biomass gasification.
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高影响因子
DESALINATION
·
2026
·
IF 9.9
Jilong Han,Ruyi Shi,Mochi Li,Huanzhang Lu,Yijian Zheng,Pengfei Li,Jisheng Li
Dense LLTO-Al 2 O 3 membrane (∼20 μm) for /Li + from high Mg 2+ /Li + brine. • Optimised LLTO (x = 0.11, 1250 °C/6 h): tetragonal, 3.26 × 10 3 S/cm. • La-poor/La-rich enables 2D Li + transport; Mg 2+ blocked by size. • Intergranular defects are main pathway for Mg 2+ co-permeation. • Selectivity 16.06, 99.61% Mg 2+ rejection (6 h); energy 23.21 kW·h (24 h). To solve the problem of lithium extraction from salt lake brine with a high magnesium‑lithium ratio, a composite ceramic membrane electrodialysis technology based on perovskite-type superionic conductor Li 3x La 2/3-x TiO 3 (LLTO) was proposed. LLTO powder was synthesised by the sol-gel method. The lithium doping amount (x = 0.11), sintering temperature (1250 °C) and time (6 h) were systematically optimised to obtain tetragonal LLTO with high ionic conductivity (3.26 × 10 −3 S/cm). Then, the LLTO-Al 2 O 3 composite film was prepared by a spin coating process (PVA content of 20%, LLTO solid content of 0.08 g/mL, spin coating 10 times) with porous alumina as the substrate. After calcination at 1275 °C for 6 h, a dense film with a thickness of about 20 μm was formed. Molecular dynamics simulations show that the two-dimensional selective transport of Li can be realised in the LLTO inner layer based on the La-poor / La-rich alternating structure, while Mg 2+ is hindered by the size effect. Intergranular defects are the main pathway leading to the co-permeation of Mg 2+ . The electrodialysis experiment showed that the membrane had good selectivity (selectivity coefficient 16.06) and Mg 2+ rejection rate (99.61%) for Li at the initial stage of operation (6 h), and the energy consumption was 23.21 kWh after 24 h of electrodialysis. This study provides a reference for membrane material design, preparation process and transmission mechanism for lithium extraction from high magnesium‑lithium ratio brine, and has potential application value.
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高影响因子
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