CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Liang Cheng,Hua Ma,Xueyang Liu,Qingquan Tang,Kuang Yang,Yuan Zhang,Hanwen Zhang,Hua Wang,Siwei Xiong
Polymer-based insulating paper is crucial for electrical equipment like transformers, high-power motors, and capacitors. However, as electronics evolve, current insulation papers fail to meet the demands for high insulation, thermal conductivity, and stability. This study introduces a novel nanocomposite paper with superior electrical strength, thermal conductivity, and weather resistance, made from self-produced polyarylate (PAR) nanofibers and Al 2 O 3 nanoparticles. The high aspect ratio PAR nanofibers form a network that effectively captures Al 2 O 3 nanoparticles, and thermoplastic properties of PAR enable thermal welding at the interface, minimizing defects. Experimental results demonstrate that when Al 2 O 3 nanoparticles aggregate to a specific size and are fully encapsulated by PAR nanofibers (Al 2 O 3 = 30 wt%), the resulting Al 2 O 3 /PAR nanocomposite paper exhibits superior insulation and thermal conductivity characteristics. It achieves electrical breakdown strength and thermal conductivity of 115.4 kV/mm and 2.726 W/(m·K), improving by 356 % and 2599 % over commercial aramid paper. Additionally, following 24 h of exposure to elevated temperatures (200°C) and ultraviolet (UV) treatment, the breakdown strength of commercial aramid paper decreased to 10.3 kV/mm and 9.3 kV/mm, respectively. In contrast, the Al 2 O 3 /PAR nanocomposite paper-maintained breakdown strengths of 101.6 kV/mm and 94.7 kV/mm, underscoring its excellent resistance to environmental degradation.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 11
·774
·
IF 3.8
Ziyang Li,Chunjie Wu,Chenhao Zhang,Hui Li
The selective hydrogenolysis of glycerol to 1,3-Propanediol (1,3-PDO) presents a sustainable approach, leveraging a bio-renewable feedstock and significantly enhancing the economic viability of biodiesel production. However, the limited selectivity toward 1,3-PDO in glycerol hydrogenolysis has hindered its widespread adoption on an industrial scale. In this work, we synthesized a series of Pt/WO3–Al2O3catalysts using a simple wetness sequential impregnation method. Comprehensive characterization and kinetic studies revealed that the surface tungsten content of the catalyst exerted a critical and multifaceted influence on the catalytic performances. Under optimal conditions, glycerol could be selectively converted to 1,3-PDO with a yield of 43% in a fixed-bed continuous flow reactor. Furthermore, a plausible reaction mechanism for glycerol hydrogenolysis was proposed based on the correlations between catalyst structure and catalytic performance.
研究领域:
催化化学
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可再生资源化学
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绿色化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Hongcai Su,Ekkachai Kanchanatip,Defeng Wang,Haidan Zhang,Antoni,Ishrat Mubeen,Zhicheng Huang,Mi Yan
Ni/Al 2 O 3 catalyst is the one of promising catalysts for enhancing H 2 production from supercritical water gasification (SCWG) of biomass. However, due to carbon deposition , the deactivation of Ni/Al 2 O 3 catalyst is still a serious issue. In this work, the effects of lanthanum (La) as promoter on the properties and catalytic performance of Ni/Al 2 O 3 in SCWG of food waste were investigated. La promoted Ni/Al 2 O 3 catalysts with different La loading content (3–15 wt%) were prepared via impregnation method. The catalysts were characterized using XRD , SEM, BET techniques. The SCWG experiments were carried out in a Hastelloy batch reactor in the operating temperature range of 420–480 °C, and evaluated based on H 2 production. The stability of the catalysts was assessed by the amount of carbon deposition on catalyst surface and their catalytic activity after reuse cycles. The results showed that 9 wt% La promoter is the optimal loading as Ni/9La–Al 2 O 3 catalyst performed best performance with the highest H 2 yield of 8.03 mol/kg, and H 2 mole fraction of 42.46% at 480 °C. La promoted Ni/Al 2 O 3 catalysts have better anti-carbon deposition properties than bare Ni/Al 2 O 3 catalyst, resulting in better gasification efficiency after reuse cycles. Ni/9La–Al 2 O 3 catalyst showed high catalytic activity in SCWG of food waste and had good stability as it was still active for enhancing H 2 production when used in SCWG for the third time, which indicated that La promoted Ni/Al 2 O 3 catalysts are potential additive to improve the SCWG of food waste.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2014
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IF 4.331
Fa-tang Li,Ye Zhao,Qing Wang,Xiao-jing Wang,Ying-juan Hao,Rui-hong Liu,Dishun Zhao
Novel Al 2 O 3 /g-C 3 N 4 heterojunction photocatalysts were fabricated through ultrasonic dispersion method. Al 2 O 3 , obtained via solution combustion, contained amorphous ingredient with lots of defect sites and was used as active component for transferring photo-induced electrons of g-C 3 N 4 . G-C 3 N 4 was grafted surface hydroxyl groups in the presence of ammonia aqueous solution to combine with Al 2 O 3 possessing positive charges via hydrogen bond . The XRD, SEM, element map, TEM , HRTEM, FT-IR, and XPS results indicate that these synthesized materials are two-phase hybrids of Al 2 O 3 and g-C 3 N 4 with interaction. The photocatalytic results for the degradation of rhodamine B (RhB) indicate that the most active heterojunction proportion is 60 wt.% g-C 3 N 4 :40 wt.% Al 2 O 3 , the visible light photocatalytic activity of which is 3.8 times that of a mechanical mixture. The enhanced performance is attributed to the high separation efficiency of photo-induced electrons from the LUMO of g-C 3 N 4 injected into the defect sites of Al 2 O 3 , which is verified by photoluminescence spectroscopy (PL) and surface photovoltage (SPV) measurements. The electron paramagnetic resonance (EPR) signals and radical scavengers trapping experiments reveal holes (h + ) and superoxide anion radical ( O 2 − ) are the main active species responsible for the degradation of RhB.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Junjing Li,Wanxin Dang,Yaqian Liu,Liang Wang
The efficiency of an electrocatalytic system with filtered Pd-loaded membrane electrodes was investigated to improve the mass transfer process of the electrocatalytic system. A Pd/CGC/Al 2 O 3 membrane electrode (5 mg·cm −2 graphite + 10 wt% graphene + 5 wt% carbon black) was prepared on the tubular Al 2 O 3 membrane substrate. The results showed that the membrane electrode could realize the complete removal of chlorpheniramine maleate (CPM) 120 min. Furthermore, the Pd/CGC/Al 2 O 3 membrane electrode exhibited good tolerance to sulfites, and the electrocatalytic activity was almost unaffected in the presence of NO 3 – , Cl − , CO 3 2– , and HCO 3 – in the wastewater. The Pd/CGC/Al 2 O 3 membrane electrode surface was interconnected to form a three-dimensional porous membrane structure through the introduction of carbon materials. The membrane electrode had a larger specific surface area and the metal Pd nanoparticles were uniformly loaded on the surface of CGC/Al 2 O 3 tubular electrode. Combined with the analysis of quenching experimental data, the removal mechanism of CPM on Pd/CGC/Al 2 O 3 membrane electrode was proposed. The Pd/CGC/Al 2 O 3 membrane electrode had good stability over 7 cycles and could be adapted to the electrocatalytic hydrodechlorination of chlorinated PPCPs in different environments, which is promising for certain applications.
研究领域:
环境科学
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Xingling Zhao,Xue Zhou,Yupei Xia,Zihan Xu,Mingjun Song,Zihan Wang,Qingjie Guo,Zaiyong Jiang
Catalytic oxidation of carbon monoxide (CO) by Cu/Al 2 O 3 has garnered increasing interest in recent years due to its promising application prospects. Numerous investigations conducted on the Cu/Al 2 O 3 system, but its catalytic performance for CO oxidation is still not as promising as that of precious metal catalysts. Increasing the loading amount of the active Cu on Al 2 O 3 surface is a feasible method for improving its activity. However, with the increase of Cu loading, the agglomeration and enlargement of Cu particles is inevitable, which reduces the active Cu amount. Therefore, the utilization rate of Cu atoms is not high and the catalytic performance often can not further rise. Enhancing active Cu loading amount as high as possible is a prerequisite to further enlarge the activity of Cu/Al 2 O 3 catalyst. Herein, self-synthesized Al 2 O 3 nanofibers (Al 2 O 3 -nf) with high specific surface area and abundant penta-coordinated aluminum (Al V ) are used as the support to maximize the Cu loading amount by chemical vapor deposition (CVD). And commercially available α-Al 2 O 3 is used for comparative experiment. The high specific surface area could make Cu high dispersion on Al 2 O 3 , even at 20 wt% Cu loads, which is beneficial to high concentration load of active Cu. The catalytic activity of Cu/Al 2 O 3 -nf-CVD gradually increases with the increase of Cu loading from 2 wt% to 20 wt%, exhibiting a clear linear correlation with the surface content of Cu 0 on the catalyst. Meanwhile, this result confirms that Cu 0 plays a crucial role in CO oxidation of Cu/Al 2 O 3 . However, commercial α-Al 2 O 3 reaches its highest activity when the Cu load is 5%, and then its activity begins to decrease due to the agglomeration of particles. Moreover, Cu/Al 2 O 3 -nf-CVD also exhibits remarkable thermal stability for CO oxidation. This work highlights a new strategy to synthesis of high Cu loading amount, high activity and thermostable Cu/Al 2 O 3 catalyst for low-temperature oxidation of CO.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2020
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IF 1.724
Feng Zhou,Xianghong Ren
1,1-Dimethylhydrazine (UDMH) and its by-products were considered carcinogenic toxins and represent a serious health hazard to the population once present in water under natural conditions without treatment. The conventional degradation method suffers from incomplete removal of intermediate products (especially N-nitrosodimethylamine (NDMA)), the powdery catalysis being difficult to recover and results in high energy consumption. In this study, a series of Bi2O3/TiO2/Al2O3 (BTA) photocatalysts have been successfully synthesized by a simple dry mixing method with powder material followed by their immobilization. It was evaluated by the photocatalytic degradation of UDMH present in wastewater, which can be recovered by rapid filtration and utilizes only solar energy. The catalyst exhibited markedly enhanced photocatalytic activity for the degradation of UDMH wastewater compared with conventional TiO2/Al2O3 (TA) catalysts under UV, visible and solar irradiation. Besides, the intermediate NDMA was gradually completely degraded. The photocatalysts were extensively characterized using scanning electron microscopy, energy dispersive spectrometry, specific surface area (BET), X-ray diffraction, X-ray photoelectron spectroscopy, UV–visible diffuse reflectance spectroscopy and photo-electrochemical I–t curves evaluation. The results revealed that all the BTA composites exhibited high stability and stronger absorbance in visible light. In addition, the BTA exhibited a reversible photochromic property that can effectively expand the range of light absorption and enhance the photocatalytic activity. The reversible photochromic properties of BTA explained in the proposed mechanism model are expected to be useful for detecting and sensing UDMH or other organic contaminants.
研究领域:
环境科学
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催化化学
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材料科学
✓ 已验证
DOI
高影响因子
CARBON
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2016
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IF 6.198
Lei Tang,Qichong Zhang,Chaowei Li,Xiaona Wang,Kai Zhang,Yancui Xu,Taotao Li,Jianhui Fang,Yagang Yao
Taking the importance of uniform size catalysts and the unfavorable effects of residual metal catalysts into consideration, herein, we develop a facile way which utilizes the typical and facile semiconducting technique namely atomic layer deposition (ALD) to prepare non-metallic Al 2 O 3 catalysts for narrow diameter single-walled carbon nanotube (SWNT) arrays growth. As a result, we obtained SWNT arrays with narrow-diameter distribution of 1.26 ± 0.033 nm on the a-plane sapphire substrates . Moreover, the relationship between catalysts and SWNTs were explored. These optimized conditions pave an avenue for narrow diameter even chirality distribution in SWNTs growth, which promotes the development of structure-controlled and relative applications of SWNTs.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiaoxia Zhang,Zhipeng Zhou,Junjie Liao,Liping Chang,Jiancheng Wang,Weiren Bao
The ultra-deep removal of thiophene from coke oven gas (COG) is critical for the conversion of COG to methane. Currently, Cu/ZnO/Al 2 O 3 is considered as a promising sorbent for thiophene removal; however, its desulfurization performance is currently unable to meet the requirements for industrial applications. Here, a zirconium modification strategy is proposed to overcome this problem, allowing zirconium loaded copper-based sorbents (Cu/ZnO/Al 2 O 3 /ZrO 2 ) with significantly improved thiophene removal performance and high activity to be obtained. Characterization results showed that zirconium improved both the dispersion of copper and the concentration of Lewis acid sites on the sorbent surface. A ZrO 2 concentration of 2 % resulted in stronger Cu-Zn interaction, and the dispersion of Cu on the surface of the sorbent reached its maximum value (49.20 %). Additionally, the Lewis acid strength was also maximized, which greatly improved the desulfurization activity and resulted in a breakthrough adsorption capacity of thiophene (Q b-thiophene ) of 36.24 mg/g, which was about 17 % higher than that of the unmodified Cu/ZnO/Al 2 O 3 sorbent. These results demonstrate that the sulfur capacity of the sorbent can be increased by increasing the number of acidic sites on its surface, paving the way for ultra-deep thiophene removal in industrial applications.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 5
·416
·
IF 4
Jie Qin,Guohong Chen,Kaiqi Zheng,Jiajun Wu,Fanan Wang,Xueping Liu,Rengui Weng
2-Methyltetrahydrofuran (2-MTHF), a hydrogenated derivative of levulinic acid (LA), is a biomass-derived platform compound with diverse and significant applications as a biofuel, gasoline additive, green solvent, and pharmaceutical synthesis intermediate. This study investigates the preparation of a Cu1Ni2/Al2O3catalyst through the calcination–reduction of CuNiAl hydrotalcite as a precursor, which was subsequently utilized in the hydrogenation of LA to produce 2-MTHF. The calcination–reduction process applied to CuNiAl hydrotalcite results in a lattice confinement effect. This method not only disperses the active metal sites but also alters the bonding patterns of the active metals, thereby enhancing the activity and stability of the Cu1Ni2/Al2O3catalyst. The results indicate that complete conversion of LA and a 2-MTHF yield of 87.6% can be achieved under optimal conditions of 190 °C, 5 MPa hydrogen, and a reaction time of 5 h, demonstrating an efficient one-step conversion process. Additionally, the catalyst’s recyclability was assessed through multiple reuse tests, with a loss of activity of only 9.2% after six cycle experiments, suggesting its feasibility and reliability for industrial applications.
研究领域:
催化化学
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生物质转化
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2022
·
IF 5.431
Zhenqiang Ye,Chao Ji,Tao Yu,Rong Sun,Xiaoliang Zeng,Bingyang Cao
Thermal interface materials (TIMs) are indispensable materials in thermal management, and Al 2 O 3 -based TIMs are most widely used in thermal managements. Surface modification is an effective method to improve Al 2 O 3 dispersion in matrix, thereby increasing the maximum filler loading. However, traditional surfactants hardly promote the interfacial heat-transfer on the premise of the same filler loading. In this work, we proposed an electrostatic self-assembly strategy to functionalize the surface of Al 2 O 3 particles with MXene sheets to enhance the interfacial heat-transfer between fillers and silicone rubber (SR). To validate the effectiveness of MXene, we compared the Al 2 O 3 -MXene-SR TIM with Al 2 O 3 -graphene-SR TIM and Al 2 O 3 -SR TIM under the same Al 2 O 3 loading in the aspects of mechanical properties and thermal properties. Though MXene could increase the viscosity and hardness, the negative influence of MXene is much weaker than that of graphene. Nevertheless, the positive impact of MXene is more significant. First, it can reinforce the mechanical strength. The experiment showed the breaking tensile strength of the Al 2 O 3 -MXene-SR TIM is 0.117 MPa, higher than that of the Al 2 O 3 -graphene-SR TIM (0.082 MPa) and the Al 2 O 3 -SR TIM (0.07 MPa). Second, the thermal conductivity of TIMs improves a lot after MXene coating. The thermal conductivity of Al 2 O 3 -MXene-SR TIM is 3.4 W·m −1 ·K −1 , with the matrix/filler mass ratio of 100:1600, which is 30% higher than that of the Al 2 O 3 -SR TIM (2.6 W·m −1 ·K −1 ) and 21% higher than that of Al 2 O 3 -Gr-SR TIM (2.8 W·m −1 ·K −1 ). Whereas the Al 2 O 3 loading keeps the same and the MXene fraction is only about 1.16 vol‰, the increment of the thermal conductivity is mostly due to the improvement of interfacial heat-transfer via MXene. The temperature cycling test and aging test implied that the Al 2 O 3 -MXene-SR TIM is thermally stable and reliable. The underlying mechanism of the interfacial heat-transfer enhancement was revealed by the analysis of phonon density of states (PDOS) via a molecular dynamics simulation. The PDOS of MXene is more compatible with Al 2 O 3 and SR than graphene, so MXene sheets play the role as a bridge between Al 2 O 3 and SR to improve the interfacial phonon transport. This work provides an effective method to reduce interfacial thermal resistance in TIMs, which could facilitate the development of thermal management materials.
研究领域:
材料科学
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热管理技术
·
界面工程
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Tianran Zhang,Quanjiang Lv,Siyu Zhang,Mengfan Song,Siyuan Li,Lixue Zhang,Jiping Wang
In polymer dielectric energy storage, even polymers with high glass transition temperatures suffer significant degradation in energy storage performance as temperature increases, primarily due to a sharp rise in electrical conduction loss. In this study, we employ atomic layer deposition to coat the surface of a PEI/PVDF blend film with an Al 2 O 3 inorganic layer to enhance its energy storage performance at high temperatures. The influence of the inorganic layer's thickness on high-temperature energy storage performance is thoroughly analyzed. Experimental results and finite element simulations demonstrate that an ultra-thin Al 2 O 3 inorganic layer with the thickness of 50 nm effectively reduces leakage current density and mitigates space charge accumulation within the PEI/PVDF blends, thereby improving the high-temperature energy storage performance of the blends. Notably, under an applied electric field of 500 MV/m at 150 °C, the PEI/PVDF blend film with 50 nm Al 2 O 3 layer achieved a discharge energy density of 5.45 J/cm 3 and a charge-discharge efficiency of 97.75 %.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）