CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiaoyu Jin,Tianwei Zhu,Junfeng Mao,Jinghao Miao,Haipeng Wang,Yang Wang,Ying Song,Zhenxin Duan,Xiaolei Song
Alumina-based nanofiber aerogels are commonly utilized in high-temperature insulation applications because of their remarkable chemical stability and low thermal conductivity. However, Al 2 O 3 nanofibers tend to experience grain growth at high temperatures, which severely impacts their performance. In this study, core-shell Al 2 O 3 nanofibers with SiO 2 coating were prepared using coaxial electrospinning technology. Combined with the foam template method and freeze-drying technology, Al 2 O 3 nanofiber aerogels with excellent thermal stability were fabricated. The results show that the shell thickness was controlled by adjusting the injection speed of SiO 2 solution. The SiO 2 shell effectively suppressed Al 2 O 3 grain growth, and as the shell thickness increased, the phase transition rate from γ -Al 2 O 3 to α -Al 2 O 3 gradually slowed, effectively enhancing the fibers' thermal stability. Moreover, as the SiO 2 shell thickness increased, the compressive strength of the aerogel after 1000 °C calcination increased from 16.08 kPa to 28.6 kPa at 50% strain, while its thermal conductivity decreased to 0.0298 from 0.0402 W/(m·K). This demonstrates a marked enhancement of the aerogel's mechanical and thermal insulation properties, further showing that improved fiber thermal stability contributes to overall aerogel performance. This study provides an effective approach for designing nanofiber aerogels with superior properties and offers a reference for their further application in high-temperature thermal insulation fields.
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MOLECULES
·
2026
·Vol. 31
·期 11
·1934
·
IF 5.1
Yuxin Ma,Mengjiao Zhang,Wenqiang Wang,Hanwen Zhang,Wenzhe Li,Xiangxiang Gu,Qiuxia Fu,Haoru Shan
Ceramic nanofiber-based materials have wide applicability in high-temperature management and protection. The transformation of conventional two-dimensional ceramic nanofibrous membranes into three-dimensional nanofiber-based bulks can effectively improve their thermal insulation performance and expand their range of applications. Herein, lamellar-structured Al2O3-SiO2nanofibrous aerogels (LASO NFAs) with varying inorganic binder contents were prepared via a sequence of processes involving face-to-face stacking, impregnation, and calcination, using flexible Al2O3-SiO2nanofibrous membranes (ASO NFMs) as building units and aluminum dihydrogen phosphate as an inorganic binder. Varying the inorganic binder content in the aerogel matrix enables effective control over the compressive properties and interlayer spacing of the resulting aerogels. Specifically, the optimized LASO-20 NFAs demonstrated relatively good compression resilience, with a plastic deformation of 22.1% after undergoing 500 compressive cycles at a compressive strain of 50%. Moreover, profiting from the high-temperature resistance of ASO NFMs and substantial air content present within nanofiber interlayers, the LASO-20 NFAs with a thickness of 20 mm could effectively insulate against surface temperatures of 1000 °C down to 224 °C. Moreover, LASO-20 NFAs exhibited a room-temperature thermal conductivity of approximately 0.043 W·m−1·K−1, illustrating a favorable high-temperature thermal insulation characteristic. Furthermore, the LASO-20 NFAs presented promising service performance in extreme environments, providing a novel perspective in the development of new types of ceramic aerogels.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2026
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IF 10.6
Jiabai Cai,Wenjia Huang,Jieyi Gong,Jiaqing Huang,Huan Li
Catalytic air oxidation of refractory organic wastewater often faces limitations such as low efficiency and high energy consumption. Herein, by encapsulating size-tuned copper nanoparticles (NPs) within porous Al 2 O 3 and finely optimizing the associated Cu(I)/Cu(II) ratio, we realized a catalytic mechanism that synergistically leveraged spatial confinement and a low-temperature thermal induction effect (LTIE). Porous-Al 2 O 3 -enabled spatial confinement improved surface crystallinity and effectively suppressed copper NPs aggregation. Compared to the high energy required by gas-phase O–O bond homolysis (∼5.16 eV), O–O activation on the Al 2 O 3 @Cu catalyst required dramatically less energy (∼0.1 eV) owing to efficient charge transfer. Under low-temperature conditions, the LTIE promoted hot-electrons generation and transfer, thereby enabling the cascade production of reactive oxygen species (including · OH, · O 2 ⁻, and 1 O 2 ), resulting in exceptional performance in the catalytic air oxidation of refractory organic pollutants. In batch experiments, the LTIE caused an 86% reduction in ultraviolet absorbance at 254 nm for actual biogas slurry at 90°C within 5 h. Further, a continuous bench-scale system demonstrated an average chemical-oxygen-demand removal rate of 92%, compliant with wastewater treatment standards. This study presents an efficient strategy integrating spatial confinement, electron transfer, and thermal activation to achieve complete mineralization of refractory organic pollutants in wastewater.
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PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2013
·
IF 0.601
Zhikui Yin,Bin Zheng,Fang Ai
Sulfonic acid functionalized nano γ-Al2O3 is easily prepared by the reaction of nano γ-Al2O3 with 1,3-propane sulfone. This reagent can be used as an eficient catalyst for the synthesis of thioamides. This new method consistently has the advantages of excellent yields and short reaction times. Further, the catalyst can be recovered for several times.
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RENEWABLE ENERGY
·
2026
·
IF 9.1
Chenzhirui Zhou,Cheng Tan,Yong Yu,Shi Cheng,Chaowei Ma,Jianhang Hu,Hua Wang
Lignocellulosic biomass possesses significant potential as a carbon-based renewable energy source. Fast pyrolysis can convert biomass into valuable derivatives, though achieving high selectivity for target compounds remains a challenge. In this study, acid-leached slag (ALS) derived from spent Al 2 O 3 -based catalysts was employed as a catalyst to investigate its effect on the pyrolysis products of water hyacinth (WH). Under optimal conditions of a WH/ALS ratio of 1:3 at 500 °C, the bio-oil yield reached 70.81 wt%, and furfural yield achieved 97.37 area% with a concentration of 83.96 mg/mL. This enhancement is attributed to the synergistic catalytic activity of Brønsted and Lewis acid sites on ALS, which substantially improves the directional selectivity toward furfural. Concurrently, biochar undergoes aromatization, forming aromatic ring structures that promote graphitization, while the proportion of combustible syngas rises to 99.84%. Additionally, N-containing heterocyclics from the bio-oil are redistributed into the biochar (as graphitic-N, pyrrolic-N, and pyridinic-N) and syngas. This study demonstrates an effective strategy for simultaneously valorizing WH and ALS, offering a novel approach for producing high-value chemicals through catalytic pyrolysis of lignocellulosic biomass.
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FUSION ENGINEERING AND DESIGN
·
2017
·
IF 1.319
Heping Li,Zhiqiang Ke,Lihong Xue,Youwei Yan
α-Al 2 O 3 -based coatings have attracted great interest as promising tritium permeation barrier used in the D-T fusion reactor system. However, it is still difficult to fabricate α-Al 2 O 3 coatings at a low temperature that can be endured by the steel substrate. Herein, thermal-chemical reaction method was developed for the fabrication of α-Al 2 O 3 -based coatings. α-Al 2 O 3 /AlPO 4 composite coating was successfully formed on the steel substrate at 500 °C. The resulted coating was uniform and compact without presence of pores and cracks. The binding strength of the coating was tested and the result indicated its good adherence to the substrate. Moreover, the coating thickness could be easily controlled. The low-temperature approach developed is expected to provide a new platform for fabricating α-Al 2 O 3 -based coatings as tritium permeation barrier. This approach is also applicable to the fabrication of other ceramic coatings.
研究领域:
材料科学
·
核工程
·
陶瓷涂层
·
聚变反应堆技术
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Atmosphere
·
2022
·Vol. 13
·期 2
·333
·
IF 3.11
Chao Wang,Lingdong Kong,Shengyan Jin,Lianghai Xia,Jie Tan,Yuwen Wang
Soot and aged soot are often found to be mixed with atmospheric particles, which inevitably affect various atmospheric heterogeneous reactions and secondary aerosol formation. Previous studies have investigated the heterogeneous reaction of NO2with different types of soot, but there are few studies on the heterogeneous reaction of NO2with mixtures containing diesel soot (DS) or aged DS and mineral dust particles. In this study, the effects of DS and aged DS on the heterogeneous reaction of NO2on the surface of γ-Al2O3were investigated via in-situ diffuse reflectance infrared Fourier transform spectrometry (DRIFTS). The results showed that the DS or DS n-hexane extract significantly inhibited the formation of nitrate on γ-Al2O3particles and promoted the formation of nitrite. At 58% RH, with the increase of DS or DS n-hexane extract loading amount, the effect of DS or DS n-hexane extract on the formation of nitrate changed from promotion to inhibition, but DS or DS n-hexane extract always promoted the formation of nitrite. The results also showed that light was conducive to the formation of nitrate on the DS-γ-Al2O3or DS-n-hexane extract-γ-Al2O3particles. Furthermore, the influence of soot aging on the heterogeneous reaction of NO2was investigated under light and no light. In the dark, O3-aged DS-γ-Al2O3or O3-aged DS-n-hexane extract-γ-Al2O3firstly inhibited the formation of nitrate on the mixed particles and then promoted it, while the effect of aged DS on nitrite formation was complex. Under light, the O3-aged DS-γ-Al2O3firstly promoted the formation of nitrate on the mixed particles and then inhibited it, while the O3-aged DS-n-hexane extract-γ-Al2O3promoted the formation of nitrate on the mixed particles. Our results further showed that the production of nitrate on the O3-aged particles under light or no light was greater than that of the UV-nitrate-aged particles. This study is helpful to deeply understand the atmospheric chemical behavior of soot and the heterogeneous conversion of atmospheric NO2.Keywords:soot;NO2;heterogeneous reaction;aged soot;γ-Al2O3
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yixi Wang,Wenqing Xu,Chaoqun Li,Yang Yang,Zanbu Geng,Tingyu Zhu
Gaseous ammonia (NH 3 ), especially that emitted from selective catalytic reduction with NH 3 (NH 3 –SCR) units in the atmosphere is potentially harmful to both human health and the environment. The noble metal catalytic oxidation technology placed behind the SCR unit has been considered to be a promising method for decreasing NH 3 slip. In this study, we prepared Ir/Al 2 O 3 catalysts using two different crystal structures of Al 2 O 3 (α–Al 2 O 3 or γ–Al 2 O 3 ) as supported by an impregnation method and evaluated the performance of the selective catalytic oxidation of NH 3 (NH 3 –SCO). We found that the Ir/γ–Al 2 O 3 catalyst performed better than the Ir/α–Al 2 O 3 catalysts, with 99% of NH 3 converted at 260 °C. The X–ray absorption fine structure revealed that the active species on the Ir/Al 2 O 3 catalysts are mainly oxidized IrO 2 . High–angle annular dark–field images of aberration–corrected scanning transmission electron microscopy revealed that IrO 2 species over 1 nm in diameter are beneficial for activity. In situ diffuse reflectance for infrared Fourier transform spectroscopy studies suggested that the differences in NH 3 –SCO activity were caused by the activity of reactive oxygen species, and the formation of –NH 2 may be the decisive step of the NH 3 oxidation reaction.
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Crystals
·
2022
·Vol. 12
·期 3
·318
·
IF 2.67
Ze Li,Jie-Ying Jing,Zhi-Qiang Qie,Wen-Ying Li
Jet fuel rich in hydroaromatics and cycloalkanes could be derived from direct coal liquefaction oil via the hydrogenation saturation process. Developing an efficient catalyst to transform naphthalene hydrocarbons to hydroaromatics and cycloalkanes with high selectivity plays a significant role in realizing the above hydrogenation saturation process. In this work, Ni2P/Al2O3catalysts were prepared at different reduction temperatures via the thermal decomposition of hypophosphite. We investigated the influence of reduction temperature and the results showed that reduction temperature had an important impact on the properties of Ni2P/Al2O3catalysts. When the reduction temperature was 400 °C, the Ni2P particle size of the Ni2P/Al2O3catalyst was 3.8 nm and its specific surface area was 170 m2/g. Furthermore, the Ni2P/Al2O3catalyst reduced at 400 °C obtained 98% naphthalene conversion and 98% decalin selectivity. The superior catalytic activity was attributed to the smaller Ni2P particle size, higher specific surface area and suitable acidity, which enhanced the adsorption of naphthalene on Ni2P/Al2O3catalyst.Keywords:nickel phosphide;reduction temperature;naphthalene hydrogenation;thermal decomposition of hypophosphite
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RSC Advances
·
2022
·Vol. 12
·期 21
·13261-13266
·
IF 4.036
Tao Li,Hongjun Kang,Songtao Lu,Wei Qin,Xiaohong Wu
As deep space exploration moves farther and farther away, thermal control coating of the in-orbit spacecraft will suffer a serious vacuum-ultraviolet radiation environment, which seriously threatens the reliability of the spacecraft in orbit. Therefore, it is important to improve the vacuum-ultraviolet resistance performance of the thermal control coating. In this work, the inorganic Al2O3–ZnO–Y2O3 thermal control coating was in situ fabricated on a 6061 aluminum alloy surface by PEO technology, and its vacuum-ultraviolet resistance performance was investigated. The results show that the Al2O3–ZnO–Y2O3 thermal control coating has a good resistance performance to vacuum-ultraviolet radiation, which is mainly because the large extinction coefficients of the ZnO and Y2O3 materials in the ultraviolet band are conducive to improving the ultraviolet resistance performance. Furthermore, the life prediction model of the Al2O3–ZnO–Y2O3 thermal control coating shows that its Δαs value first slightly increases and then tends to be stable with the increase of ultraviolet irradiation time from 0 ESH to 25 000 ESH, and the maximum variation of Δαs is about 0.0536. This work provides a material basis and technical support for the thermal control system of spacecraft with long life and high reliability.
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Molecular Catalysis
·
2022
·
IF 5.089
Zhiquan Yu,Yan Li,Yunlong Yao,Yao Wang,Ying-Ya Liu,Zhichao Sun,Chuan Shi,Wei Wang,Anjie Wang
A bifunctional Ni 3 P/γ-Al 2 O 3 catalyst with both metal site and Lewis acid site was prepared by an electroless plating method, and applied in hydrogenative ring-rearrangement of furfural to cyclopentanone. The obtained catalyst was characterized by XRD, XPS, XAS, N 2 adsorption-desorption, ICP, TEM, CO chemisorption, NH 3 -TPD and Py-FTIR. The ultrafine Ni 3 P nanoparticles (∼3.8 nm) were highly dispersed in the catalyst. The exclusive Lewis acidity of Ni 3 P/γ-Al 2 O 3 was beneficial for the aqueous-phase hydrogenative ring-rearrangement. The effects of DP time, reaction parameters (temperature, H 2 pressure, solvent composition, and reaction time) on the catalytic performance were investigated. The yield of cyclopentanone was 74.6% at furfural conversion of 99.9% at 180 °C in 1 h over Ni 3 P/γ-Al 2 O 3 catalyst using pure water as the solvent. Moreover, the kinetics of hydrogenative ring-rearrangement of furfural catalyzed by Ni 3 P/γ-Al 2 O 3 was investigated.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Lian Duan,Chi Ma,Fengyan Lou,Jiabin Yin,Le Sang,Jisong Zhang
External mass transfer performance of micropacked bed reactors (μPBRs) with Pd/Al2O3/nickel foam catalysts is investigated by the hydrogenation of α-methylstyrene (AMS). The external mass transfer limitation region for AMS hydrogenation can be determined by means of the apparent activation energy and internal effectiveness factor. Parametric studies for external mass transfer are conducted by varying temperatures, operating pressures, liquid viscosities, gas and liquid superficial velocities, and pore diameters of foam packing. The external volumetric mass transfer coefficients [(ka)OV] of μPBRs with the Pd/Al2O3/nickel foam range from 0.06 to 0.71 s–1. An empirical correlation of (ka)OV is developed. Based on the gas–liquid–solid process analysis, the external mass transfer of μPBRs with the Pd/Al2O3/nickel foam is limited by liquid–solid mass transfer under the experimental conditions. Moreover, μPBRs with the Pd/Al2O3/nickel foam exhibit the best energy efficiency in comparison with that of other multiphase reactors.
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