JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Hao Zhao,Chongbo Cheng,Pengfei Li,Fengjie Bian,Dekui Shen,Xiaoxiang Jiang
The selective hydrodeoxygenation (HDO) of lignin-derived phenolics such as guaiacol into high-value chemicals under mild conditions presents a persistent challenge in biomass valorization. In this work, a series of Ni x -Fe y /Al 2 O 3 catalysts were synthesized by a sol-gel method and evaluated for the HDO of guaiacol. Characterization (XRD, XPS, H 2 -TPR, NH 3 -TPD, etc.) revealed that the Ni x -Fe y /Al 2 O 3 catalysts possess enhanced textural properties, improved metal dispersion, and tailored surface acidity, collectively contributing to their high activity and selectivity. The introduction of Fe promotes the formation of a Ni 3 Fe alloy and defect-rich FeO x species. Under mild conditions (180 °C, 2 MPa H 2 ), Ni 5 /Al 2 O 3 achieved full guaiacol conversion with > 85% selectivity to 1,2-cyclohexanediol. By introducing Fe and increasing the temperature to 260 °C (2 MPa H 2 ), the Ni 5 -Fe 1 /Al 2 O 3 catalyst shifted the reaction pathway toward deeper deoxygenation, yielding cyclohexane with over 78% selectivity. This tunable selectivity originates from a synergistic mechanism in which metallic Ni/Ni 3 Fe sites facilitate hydrogenation and hydrogenolysis, while acid sites and FeO x -derived oxygen vacancies promote the dehydration of diol intermediates, especially at higher temperatures. This study provides a design-oriented bimetallic strategy for the targeted valorization of lignin into distinct high-value chemicals.
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Fa-tang Li,Ya-bin Xue,Bo Li,Ying-juan Hao,Xiao-jing Wang,Rui-hong Liu,Jun Zhao
Mesoporous γ-Al2O3 with high surface area (159 m2/g) is prepared via a precipitation method. The as-synthesized Al2O3 exhibits optical absorption ability in the ultraviolet region and is used as the active component to be combined with g-C3N4 to form effective heterostructured photocatalysts. This heterojunction structure is confirmed by X-ray diffraction, scanning electron microscopy, element map, transmission electron microscopy, high-resolution transmission electron microscopy, Fourier transform infrared, and X-ray photoelectron spectroscopy measurements. The photocatalytic performances of the composites are evaluated by the degradation of rhodamine B (RhB) and methyl orange (MO). Among the prepared photocatalysts, 2g-C3N4:1Al2O3 (weight ratio) exhibits the highest photocatalytic activity, the reaction rate constant of which is 2.5 and 3.7 times that of pure g-C3N4 in degradation of RhB and MO, respectively. The enhancement in activity of heterojunctions is ascribed to their high specific surface areas, excellent adsorption abilities for dyes, and efficient transfer of photogenerated electrons from the lowest unoccupied molecular orbital of g-C3N4 to the defect sites of γ-Al2O3.
研究领域:
材料科学
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光催化
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纳米材料
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表面化学
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环境功能材料
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DOI
高影响因子
Journal of Physical Chemistry C
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2018
·
IF 4.484
Xueyan Chen,Min Chen,Guangzhi He,Fei Wang,Guangyan Xu,Yaobin Li,Changbin Zhang,Hong He
Ag-based catalysts are efficient materials for formaldehyde (HCHO) oxidation in the low-temperature range. It has been reported that K addition can increase the catalytic performance of Ag-based catalysts, whereas the specific role of K doping remains ambiguous. In this work, Ag/Al2O3 and K–Ag/Al2O3 catalysts with different K doping levels were prepared and subsequently tested for catalytic HCHO oxidation. It was observed that K doping has a dramatic promotion effect on the activity of the Ag/Al2O3 catalyst. The 2K–Ag/Al2O3 sample was the most active catalyst, over which HCHO could be completely converted into CO2 and H2O in a gas hourly space velocity of 100 000 mL/(gcat h) at 65 °C. The catalysts were next characterized by X-ray powder diffraction, Brunauer–Emmett–Teller, transmission electron microscopy, H2-temperature-programmed reduction, UV–vis, X-ray absorption fine structure, and in situ diffuse reflectance infrared Fourier transform spectroscopy methods. The characterization results show that addition of K species increased the content of metallic Ag species in Ag/Al2O3 catalysts and promoted the adsorption and activation of oxygen species, whereas excessive doping with K+ resulted in the agglomeration of Ag particles and loss of some metallic sites. Therefore, the 2K–Ag/Al2O3 catalyst demonstrated the best performance among the series of K-doped catalysts. Promotion of O2 activation by K doping, rather than enhanced Ag dispersion or surface OH activation or exposure of more Ag(111) facets, was found to be the key factor in the improved catalytic performance of K–Ag/Al2O3 catalysts.
研究领域:
环境催化
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材料化学
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大气污染控制
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纳米催化
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表面科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2014
·Vol. 40
·期 9
·14105-14110
·
IF 2.086
Hongyu Liu,Jun Xu,Baohua Guo,Xiangming He
In order to improve the safety of lithium-ion batteries, Al 2 O 3 /SiO 2 composite ceramic layers were introduced on both sides of polypropylene (PP) separator surface. SiO 2 is used to form porous network, and Al 2 O 3 is evenly distributed in it. The introduction of Al 2 O 3 /SiO 2 composite ceramic layers can not only restrict the motion of separator but also resist the protrusion of the separator, so the composite separator has lower thermal shrinkage and higher mechanical properties. As the composite layers can retain additional liquid electrolyte, the composite separator has higher electrolyte uptake and ionic conductivity . Cell performance, such as C-rate capability and cycle performance, were also investigated and compared to those obtained with pristine separator and only SiO 2 coated separator.
研究领域:
材料科学
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储能
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电化学
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电池技术
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DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jun Luo,Ao Wang,Lichao Jia,Dong Yan,Mei Hu,Jian Li
For the improvement of commercial catalyst 13 wt % Cr-γ-Al2O3 for the dehydrogenation of light alkanes to olefins, 13 wt % Cr-x wt % Ce-γ-Al2O3 catalysts with x equaling 0, 2.5, 5, 7.5, and 10, named as 0Ce, 2.5Ce, 5Ce, 7.5Ce, and 10Ce, are prepared by the incipient wetness impregnation method, characterized by X-ray diffraction, transmission electron microscopy, Raman, UV–vis, X-ray photoelectron spectroscopies, and temperature-programmed reduction and evaluated for ethane dehydrogenation to ethylene. Their performance increases with Ce addition to 5 wt % and then decreases and attenuates with time. 5Ce demonstrates the highest dehydrogenation activity and better regeneration ability than 0Ce. It is found that the as-prepared 5Ce contains more active amorphous Cr6+ species and less crystalline Cr3+ species (α-Cr2O3) than 0Ce, other than the Ce species of CeO2. The reasons for the better dehydrogenation and regeneration performance of 5Ce are that the CeO2 particles in 5Ce physically separate the Cr species, promoting the formation of Cr6+ species, preventing their aggregation and migration to form less active α-Cr2O3 and inactive α-(Cr, Al)2O3, and preserving more active Cr6+ species in the as-prepared and regenerated catalysts.
研究领域:
催化化学
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化学工程
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材料科学
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石油化工
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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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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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 22
·期 1
·e14889
·
IF 1.8
Haopeng Cai,Kun Jiang,Lihua Gao,Yinglong Wei
In this paper, we prepared Al 2 O 3 –ZrO 2 –SiB 6 composite ceramics with excellent performance by introducing the second-phase high-strength healing agent SiB 6 in zirconia-toughened alumina system, artificially created cracks using Vickers hardness tester, investigated the effects of heat treatment temperature (600–1200°C) and time (0–300 min) on the microscopic morphology and bending strength of the ceramics, revealed the healing mechanism, and studied the oxidation resistance properties. It was found that the healing effect was better at heat treatment of 90 min at 700°C and 60 min at 800°C, and the flexural strength was restored to more than 95% of that of the smooth specimens in both cases. Crack repair was mainly achieved by the reaction of SiB 6 , ZrB 2 , and B 4 C with O 2 . Below 800°C, healing was mainly achieved by the reaction of SiB 6 and B 4 C with O 2 , and the generated B 2 O 3 and SiO 2 migrated toward the crack to repair it. When the healing temperature is higher than 800°C, ZrB 2 also reacts with oxygen to produce B 2 O 3 and t-ZrO 2 . It was found that the oxidation weight gain per unit area of the Al 2 O 3 –ZrO 2 –SiB 6 ceramic composite at different temperatures was small, and it has excellent oxidation resistance.
研究领域:
材料科学
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陶瓷
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高温材料
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复合材料
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力学性能
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DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Shiwei Ma,Shiyi Chen,Ahsanullah Soomro,Wenguo Xiang
Fe2O3 is an excellent active metal oxide for chemical looping hydrogen generation (CLHG) with high conversion of CO to CO2 in the reduction stage, and high H2 mole fractions in the subsequent steam oxidation stage, especially for its low cost and abundance in nature. However, supports are generally used to improve its reactivity and stability and to eliminate its carbon deposition. In this paper, Fe-based oxygen carriers are prepared by a coprecipitation method with three supports, i.e., CeO2, ZrO2, and Al2O3. The reactivity, carbon deposition, redox stability, and sintering characteristics of the oxygen carriers are analyzed to investigate the effects of supports as well as the fundamental mechanism. The results show that the properties of the oxygen carriers highly rely on the support and its interaction with iron oxide. The oxygen carrier supported on Al2O3 exhibits poor reactivity and stability, and the oxygen carrier supported on ZrO2 leads to much carbon deposition, decreasing H2 purity, despite its high reactivity and stability. Nevertheless, the oxygen carrier supported on CeO2 demonstrates good reactivity and stability with no carbon deposition observed, and the reducible support CeO2 counteracts the negative effect originating from sintering and guarantees the reactivity and stability of Fe2O3/CeO2 due to its oxygen mobility property and the oxygen mobility enhancement originating from the formation of Fe–Ce solid solution and perovskite-type CeFeO3. Overall, the reducible CeO2 is a potential support to improve the redox characteristics of iron oxygen carrier in CLHG, and the Fe2O3/CeO2 exhibits the highest reactivity at 850 °C. In addition, all three oxygen carriers are characterized by scanning electron microscopy images, energy dispersive X-ray spectrometer analysis, and X-ray diffraction patterns before and after the redox cycles.
研究领域:
能源技术
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材料科学
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化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zelong Wang,Yanan Zhang,Jungang Yi,Ning Cai,Jia Guo
Heat accumulation has emerged as a critical issue that affects the performance and reliability of modern electronic devices in their evolving toward miniaturization, high power density and high integration. The application of thermal interface materials (TIMs) as a thermal management strategy is commonly employed to tackle this problem. Herein, we report the development and characterization of highly thermally conductive but electrically insulating Cu@Al 2 O 3 /epoxy composites. Stemming from the excellent thermal conductivity of Cu, the Cu@Al 2 O 3 /epoxy composites exhibit thermal conductivity of 1.32 W/m·K at 10 vol% filler content , which is nearly 7 times higher than that of the epoxy resin . Simultaneously, the Cu@Al 2 O 3 /epoxy composites still retain a high electrical resistivity of 2.3 × 10 13 Ω·cm, which is 6 orders of magnitude greater than that of Cu/epoxy composites without Al 2 O 3 barrier layers, because the dense nanoscale insulating Al 2 O 3 shell effectively inhibits the electron transfer . In addition, the Cu@Al 2 O 3 /epoxy composites possess lower dielectric constant and dielectric loss , and better mechanical properties than those of Cu/epoxy composites.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2012
·
IF 2.353
Gang Jian,Dongxiang Zhou,Junyou Yang,Hui Shao,Fei Xue,Qiuyun Fu
BaTiO 3 /CoFe 2 O 4 bilayer films on high temperature resistant Al 2 O 3 /Pt substrates were fabricated using the electrophoretic deposition (EPD) method. Powder synthesis , suspension preparation and kinetics of deposition were investigated in detail. Two different sintering temperatures were tested and the resultant microstructure and properties of ceramic films were investigated. The composite films sintered at a temperature of 1200 °C/2 h yielded optimal microstructures and properties. The obtained bilayer films had a dense structure with no phase diffusion or passive layer. Besides to ferroelectric and magnetic properties, magnetoelectric (ME) coupling properties were also confirmed by the magnetic anisotropy and magnetic field induced polarization investigation. The composite films showed a increased P s from 16.2 to 16.85 μC/cm 2 with variations Δ P s of 4% when the magnetic field was applied in parallel direction and a decreased P s from 16.2 to 14.9 μC/cm 2 with variations Δ P s of −8% when a normal direction field was applied.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Yage Li,Shuaibing Wu,Feng Liang,Gongye Lv,Yu Tian,Haijun Zhang,Yong Liu,Guoqi Liu
Rod-like h-BN with an average diameter of 2 µm was synthesized at a relatively low temperature of 1200 °C through a catalytic pyrolysis precursor strategy using boric acid and melamine as starting materials, and Co(SO 3 NH 2 ) 2 ·4 H 2 O as a catalyst precursor. Subsequently, novel low-carbon Al 2 O 3 -C refractories were prepared via a replacement of the graphite with the as-synthesized rod-like h-BN. When 1 wt% h-BN rods were added to replace graphite, after 3 h coking at 1400 °C, the cold modulus of rupture, cold compressive strength , oxidation resistance , and thermal shock resistance of the specimen were increased by 16.4%, 24.8%, 31.2%, and 52.2%, respectively, compared with these of the control specimen. Moreover, the introduction of h-BN rods in the matrix enhanced the non-wetting ability of the refractory with molten slag, thus the rod-like h-BN modified low carbon refractory presented better slag corrosion resistance with reference to the specimen without h-BN rods.
研究领域:
材料科学
·
耐火材料
·
高温性能
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DOI
高影响因子
ACS Materials Au
·
2026
·
IF 9.1
Wei Liu,Kai Ren,Jinglei Zhou,Jinchao Zhao,Qi Liu,Liang Chen,Shanchen Zhou,Zongbo Zheng,Lei Tu,Yanlong Cao
Triply Periodic Minimal Surface (TPMS) Al2O3 ceramic structures hold significant potential for applications in biomedical engineering, catalytic systems, and thermal management technologies, which can be fabricated with high precision using vat photopolymerization-based digital light processing (DLP). However, conventional homogeneous designs for TPMS often do not fully meet advanced performance requirements, while the curing depth, a key parameter governing the dimensional accuracy and mechanical performance, has not been thoroughly investigated. To address these limitations, this study proposes an algorithm based on target porosity for designing complex graded and heterogeneous TPMS structures, followed by fabrication via DLP with optimized process parameters. The results demonstrate that the fabricated gradient-porosity TPMS scaffold under optimal parameters exhibited high performance, including dimensional accuracy exceeding 98.5%, a surface roughness as low as 1.21 μm, and a compressive strength of 38.44 MPa. These findings provide valuable references for both the design optimization and reliable DLP strategies of complex ceramic heterogeneous TPMS structures.
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DOI
PubMed
高影响因子
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