INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Bing Liu,Hong Yang,Minxue Deng,Jinbin Xu,Yongbo Xiong,Sihui Wu,Zhanwang Li,Yuncong Xu,Mingyue Wang,Wenfeng Han
The gas-phase catalytic dehydrofluorination of hydrofluorocarbons (HFCs) to hydrofluoroolefins (HFOs) is a critical pathway for HFC resource utilization. Aluminum fluoride (AlF3) derived from Al2O3 fluorination is an efficient catalyst for this process, with its performance strongly dependent on the hydroxyl content and oxygen vacancy concentration of the Al2O3 precursor. In this work, pseudoboehmite (AlOOH) was calcined at 400–600 °C to prepare Al2O3 precursors (AlOOH-T) with tailored hydroxyl contents, followed by fluorination to obtain AlF3 catalysts (AlOOH-T-F). Results showed that increasing the calcination temperature reduced the hydroxyl content and increased the oxygen vacancy concentration in AlOOH-T, leading to significant variations in crystallite size, specific surface area, and surface acid properties of the derived AlF3 catalysts. AlOOH-500-F, derived from AlOOH calcined at 500 °C (optimal hydroxyl and oxygen vacancy levels), exhibited the smallest crystallite size (13.9 nm), the largest specific surface area (21.2 m2·g–1), and abundant medium-strength Lewis acid sites. In the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa), AlOOH-500-F achieved 75% conversion with no deactivation over 32 h of operation, outperforming catalysts derived from precursors calcined at 400 °C (AlOOH-400-F) and 600 °C (AlOOH-600-F). Further studies on the fluorination degree revealed that excessive fluorination enlarged AlF3 crystallite size and intensified surface acidity, accelerating coke-induced deactivation. Among the tested catalysts, AlOOH-500-5 achieved an HFC-245fa conversion of 80% with no deactivation trend observed over 192 h, demonstrating its excellent stability and potential for industrial applications. This work highlights the critical role of precursor hydroxyl content in tailoring the AlF3 catalyst structure and acidity, providing a practical guideline for designing industrially viable catalysts for HFC conversion.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yufan Mo,Chunli Li,Huiyu Li,Luis Alberto Estudillo-Wong,Luming Wu,Yinbin Wang,Haibin Yu,Dianqing Li,Yongjun Feng
Porous spherical γ-alumina supports play the key role in the petroleum reforming industry with strict requirement in hydrothermal stability of pore structure. Here, a series of pseudo-boehmite samples with different crystal orientations were synthesized in a separate nucleation and aging steps method by adjusting the rotating speed. The pseudo-boehmite (PB-1000) at 1000 rpm yields a high (0 2 0) plane proportion of 44.52 %, which is comparable with that of 43.91 % for the Sasol Boehmite (SB) powder. The Al 2 O 3 -1000 from the PB-1000 demonstrated the highest content of γ-Al 2 O 3 phase, the lowest surface hydroxyl number of 1.56/nm 2 , and the highest hydrothermal stability with the retention rate of 75.0 % (174 m 2 ·g −1 ) at 600 °C under water vapor for 120 h, which is comparable to that of 72.3 % (191 m 2 ·g −1 ) for the Sasol sample. It is the first time to investigate hydrothermal stability of alumina from the content of γ-Al 2 O 3 phase and the surface hydroxyl groups.
研究领域:
材料科学
·
石油化工
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
San-Tai Wang,Guo-Long Wang,Zhiwei Xin,Junhua Xu,Chao Zhao,Lisheng Chi,Jian Zhang,Wei-Hui Fang
The capture of radioactive iodine is crucial for nuclear safety, but conventional silver-based adsorbents suffer from low silver utilization efficiency. Instead of traditional physical loading, we report an adaptive synthesis strategy for integrated chemical construction of silver-on-boehmite platform to achieve atom-economic iodine adsorption. The designed materials incorporate a boehmite-like support capable of anchoring single silver sites (-N–Ag–N-) along with tunable surfactant-like pendant alcoholic groups. This labile site allows partial-to-complete coordinative substitution, enabling the construction of a library of nearly 20 distinct adsorbents. Such flexible design ensures monodispersion of the unsaturated silver active centers while permitting precise modulation of their maximization exposure and accessibility. Compared to traditional adsorbents, Methanol-functionalized AlOC-188-OMe achieves comparable iodine adsorption capacity but faster capture kinetics without relying on high porosity. The sequential confinement and release of I 2 within the channels were directly visualized through single-crystal X-ray diffraction. Furthermore, the material demonstrates scalable synthesis (up to ∼10 g per batch) with avoidance of silver mirror reactions, excellent radiation resistance and promising dynamic adsorption performance—collectively underscoring its strong potential for practical applications. This work provides a novel paradigm for designing high-efficiency adsorbents by maximizing the utility of precious metal atoms.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 23
·235601
·
IF 3.874
Han Zhang,Xiaowei Zhang,Pengjun Wang,Ruowang Chen,Gangwei Gu,Shiqian Hu,Ruoyu Tian
Particulate matters (PMs) air pollution is identified as the major threat to public health and climate. High-performance air filter technology based on various electrospun nanofibers is considered as an effective strategy to eliminate the effects of PMs air pollution. However, to date, nearly all the existing micro-/nanofibers are hard to meet both requirements of high PMs removal efficiency and long service life. In this work, we reported the production of laminated polyacrylonitrile(PAN)-boehmite nanoparticles (BNPs) nanofiber structured membrane by the electrospinning process. The dimension of PAN-BNPs nanofiber can be tunable from (0.09 ± 0.03) μm to (0.81 ± 0.11) μm by controlling the PAN and BNPs concentrations in precursors. The optimized PAN-BNPs nanofiber air filter with a basis weight of 1 g m−2 demonstrates the attractive attributes of high PM2.5 removal efficiency up to 99.962% and low pressure drop of 58 Pa. Most importantly, after introducing the BNPs as electret, the removal efficiency is very stable under the air flow rate of 6 l min−1. This PAN-BNPs nanofiber with a long electrostatic duration time offers an approach for fabricating future high-performance air filters.
研究领域:
材料科学
·
环境科学
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CARBOHYDRATE RESEARCH
·
2019
·
IF 1.873
Zhe Tang,Jianhui Su
High efficiency conversion of cellulose to 5-hydroxymethylfurfural (HMF) remains a challenge today. A simple solid acid catalyst Boehmite (γ-AlOOH) with high hydrothermal stability was prepared and used as sole catalyst for the direct conversion of cellulose into HMF in mixed reaction solvents of ionic liquid 1-buthyl-3-methylimidazolium chloride (BmimCl) and dimethyl sulfoxide (DMSO). This was aimed at developing an efficient and inexpensive catalyst for the production of HMF. The effects of factors such as water, solvent, catalyst load, temperature and reaction duration were investigated. An impressive HMF yield of 58.4% with 97.2% cellulose conversion was obtained at 160 °C after 2 h. More importantly, the catalyst γ-AlOOH was reused several times without loss of its catalytic properties. After five reaction runs, an HMF yield of 47.8% with 91.0% conversion was also obtained. In addition, the catalyst γ-AlOOH displayed excellent catalytic effects on the degradation of other carbohydrates. High yields of HMF from other carbohydrates such as glucose (61.2%), starch (62.7%) and inulin (70.5%) were achieved using γ-AlOOH as the catalyst. The proposed catalytic method shows a promising potential for HMF preparation, especially for industrial-scale HMF production from renewable bioresources.
研究领域:
生物化学
·
催化化学
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PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 104
·期 2
·300-310
·
IF 2.606
Wang Linyan,Li Wenjie,Pang Tianliang,Liu Hang,Wang Chan,Zhou Liang,He Fei
Nanofiber-like and nanorod-like boehmite aerogels (BAs) were synthesized by using 1D boehmite nanofibers and nanorods as building units and chitosan as binder via sol-gel process and freeze-drying method. Two kinds of boehmite sols were both gelled via ammonia vapor gelation method. Nanofiber-like building units interconnect and tangle to form high-surface-area porous structures of BA-160, while nanorod-like ones self-accumulate and overlap to construct large-pore-diameter skeletons of BA-200. The compressive property of BAs mainly originates from the interaction of overlap joints between building units, and the overlap joints among nanofibers provide more anti-pressure positions than the ones among nanorods. The skeletons are further enhanced under the help of chitosan macromolecules due to the improved polycondensation between aluminoxane via ammonia vapor. With the increase of chitosan content, the mechanical properties of BAs increase, but the thermal conductivities decrease. All of ultralight BAs can be regarded as good thermal insulation materials.
Nanofiber-like and nanorod-like boehmite aerogels (BAs) were synthesized by using 1D boehmite nanofibers and nanorods as building units and chitosan as binder via sol-gel process and freeze-drying method. Boehmite sols turning into gels were induced by ammonia vapor, which is beneficial to homogeneous gelation of boehmite sols. Two kinds of BAs possess different mechanical properties due to different porous structural characteristics. All of BAs present the features of ultralight and thermal insulation.
研究领域:
材料科学
·
化学工程
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2026
·
IF 4.6
Tu Zhi-Jun,Cao Sheng-Bin,Liu Xiao-Song,Li Xiao-Peng,Luo Wei,Kis Dávid István
Polyethylene (PE) and polypropylene (PP) are widely used in commercial lithium-ion battery (LIB) separators owing to their high mechanical strength and chemical stability. However, both polymers suffer from poor high-temperature tolerance, low porosity, and inadequate electrolyte wettability, making it difficult to reconcile electrochemical performance with safety under thermal stress. Developing advanced lithium-ion battery separators is therefore crucial for achieving high efficiency, safe LIBs. This study presents a boehmite/polyacrylonitrile (BM/PAN) composite nanofiber separator fabricated by electrospinning and systematically examines how BM loading affects separator microstructure and electrochemical behavior. Compared with commercial PP separators, the BM/PAN composites exhibit a unique three-dimensional interconnected fiber network, together with markedly improved wettability, thermal stability and electrochemical properties. The optimal formulation contains 4 wt% BM (denoted PAN-BM-4) exhibited an outstanding wettability with electrolyte uptake of 692.5% with the porosity of 80.7% and electrolyte contact angle of 25.5°, ensuring rapid electrolyte infiltration and efficient ion transport. it also displayed a higher mechanical property with tensile strength of 7.9 MPa and elongation at break of 27% (cf. 6.5 MPa and about 45% for pure PAN), indicating enhanced structural integrity. Meanwhile, such PAN-BM-4 separator demonstrates an excellent thermal stability with negligible shrinkage at 200 °C and a residual mass of 57.6% at 800 °C, effectively mitigating the thermal-runaway risk of conventional separators. Moreover, as to the electrochemical performance, this unique PAN-BM-4 separator showed an ionic conductivity of 3.31 mS/cm, more than six times that of commercial PP, and the electrochemical stability window exceeding 5.5 V (versus Li + /Li) and a Li + transference number ( t Li +) of 0.42, substantially higher than PP (0.28) and pure PAN (0.34), reflecting enhanced selective Li+ transport. Besides, in half-cell testing, the PAN-BM-4 separator delivers an initial discharge capacity of 140.6 mAh/g at 0.5 C with 88.3% capacity retention after 100 cycles. in summary, this work establishes a viable materials-design strategy and experimental framework for next-generation LiB separators that simultaneously achieve high ionic conductivity, superior thermal stability and favorable interfacial compatibility.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·Vol. 65
·期 29
·15347-15362
·
IF 3.9
Xia Deping,Bao Keyi,Wang Wei,Lin Hualin,Han Sheng
The
surface engineering of nanomaterials is crucial for addressing
persistent issues related to their dispersion stability in base oil.
In this study, the superfine boehmite (AlOOH) nanomaterials were successfully
synthesized and subsequently modified by hexadecyltrimethoxysilane
to achieve their dispersion stability in poly α olefin 8 (PAO8)
for at least 35 days. This oil-soluble AlOOH was employed alongside
molybdenum dialkyldithiophosphate (MoDTP) as additives in PAO8 to
effectively reduce friction and wear. The results demonstrated that
the composite additives of MoDTP and oil-soluble AlOOH exhibited remarkable
friction performances in PAO8. Notably, when 1.5 wt % oil-soluble
AlOOH was combined with 0.25 wt % MoDTP, the average coefficient of
friction and wear rate were decreased by 80.93% and 86.34% compared
to base oil, respectively. Meanwhile, the tribological properties
of PAO8 containing the desired composite additive under various sliding
conditions were investigated as well. Furthermore, the synergistic
effect between the oil-soluble AlOOH and MoDTP facilitates the formation
of a robust tribofilm composed of FePO 4 , Fe 2 (SO 4 ) 3 , MoS 2 , FeO, Al 2 O 3 , Fe 2 O 3 , MoO 3 , and
Fe 3 O 4 , ultimately boosting friction-reducing
and wear-resistance effects as well as load-bearing capacity.
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高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Minye Huang,Pingxiao Wu,Jiayan Wu,Leiye Sun,Zhongbo Shang,Tianming Wang,Liu Sheng,Nengwu Zhu
In an aqueous environment, the aggregation between minerals and polystyrene nanoplastics (PSNPs) is a crucial process affecting the geochemical behavior of PSNPs. Mineral morphology is an important factor determining their properties, further influencing the heteroaggregation of PSNP-minerals. In this study, the aggregation between PSNPs and three morphologies of boehmite (γ-AlOOH) was investigated, and the effects of pH, electrolytes, and hydrogen bonds were discussed to further explore the mechanism. The results showed that boehmite played an important role in the aggregation. The heteroaggregation behavior was inhibited with the decrease of pH or the increase of electrolyte concentration, which followed the DLVO theory. The heteroaggregation extent of PSNPs among boehmites was rod-shaped boehmite (Rod-boe) > flake-shaped boehmite (Flake-boe) > fiber-shaped boehmite (Fiber-boe), which could be explained by the different contents of hydroxyl groups of boehmites and the formation of hydrogen bonds. Furthermore, natural samples from the Pearl River with a salinity gradient were collected for aggregation experiments. The results showed that electrolyte is an important factor in the aggregation of PSNPs in natural water. Our study reflected the important role of mineral morphology in the aggregation of PSNPs and provided new insights into the potential fate of PSNPs in an aqueous environment.
研究领域:
环境科学
·
材料科学
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高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Shangying Li,Hongping He,Qi Tao,Yunfei Xi,Aiqing Chen,Shichao Ji,Chaoqun Zhang,Yiping Yang,Jianxi Zhu
In this study, beidellite , paragonite and other 2:1 type layered aluminosilicates with high layer charges (2:1 type LA-HLC) were synthesized under hydrothermal conditions by using boehmite as a precursor. The concentrations of dissolved Al from boehmite precursor had important effects on the mineral components of the hydrothermal products and the layer charge density of the resultant minerals. A combination of 2:1 type LA-HLC, paragonite, and minor beidellite formed at a relatively high concentration of dissolved Al, while beidellite with a small amount of 2:1 type LA-HLC was produced at a low concentration of dissolved Al. The resultant 2:1 type LA-HLC exhibited poor swelling ability when treated with ethylene glycol. A solid-state transformation mechanism was proposed for the transformation based on the HRTEM images and EDS analyses, which showed that lattice fringes representing (001) faces of 2:1 type layered aluminosilicates (2:1 type LA) were parallel to the (020) direction of boehmite. The successful transformation of boehmite into 2:1 type LA provides insights to well understand the formation of 2:1 type LA in geological processes and offer a facile preparation approach for the synthesis of 2:1 type LA with different layer charges.
研究领域:
地质学
·
材料科学
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Tingting Gao,Peng Tian,Qianjin Xu,Hongchang Pang,Junwei Ye,Guiling Ning
Nowadays, lithium-ion batteries are required to have a higher energy density and safety because of their wide applications. Current commercial separators have poor wettability and thermal stability, which significantly impact the performance and safety of batteries. In this study, a class of boehmite particles with different grain sizes was synthesized by adjusting hydrothermal temperatures and used to fabricate boehmite/polyacrylonitrile (BM/PAN) membranes. All of these BM/PAN membranes can not only maintain excellent thermal dimensional stability above 200 °C but also have good electrolyte wettability and high porosity. More interestingly, the BM/PAN membranes’ thermal shutdown temperature can be adjusted by changing the grain size of boehmite particles. The lithium-ion batteries assembled with BM/PAN separators exhibit different thermal stability phenomena at 150 °C and have excellent rate performance and cycle stability at room temperature. After 120 cycles at 1C, the LiFePO4 half-cell assembled by the best BM/PAN separator has almost unchanged discharge capacity, whereas the capacity retention of Celgard 2325 is only about 85%. Meanwhile, the NCM523 half-cell assembled with the best BM/PAN separator shows superb cycle stability after 500 cycles at 8C, with a capacity retention of 79% compared with 56% for Celgard 2325.
研究领域:
材料科学
·
能源技术
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DOI
PubMed
高影响因子
Journal of Sustainable Metallurgy
·
2025
·
IF 3.2
Shao Shuang,Ma Baozhong,Wang Chengyan,Chen Yongqiang
Extracting Al from coal gangue has the double benefits of realizing the high-value application of coal gangue and mitigating the scarcity of bauxite resource. The key Al-containing minerals in coal gangue include kaolinite and boehmite, and thermal activation is pivotal for stimulating their reactivity. In this study, kaolinite and boehmite were subjected to thermal activation and acid leaching to explore the intrinsic link between their thermal evolution and leaching activity. Results showed that the phase evolution of kaolinite followed a multi-step sequential process in the order of kaolinite → metakaolinite → γ -Al 2 O 3 → mullite, and Al V in metakaolinite was highly active. For boehmite, it underwent the transformation of boehmite → γ -Al 2 O 3 → δ -Al 2 O 3 → θ -Al 2 O 3 and α -Al 2 O 3 successively. Their reactivity in descending order was γ -Al 2 O 3 > δ -Al 2 O 3 > boehmite > α -Al 2 O 3 . Furthermore, a comparative study of leaching temperature demonstrated that elevated temperature favorably strengthened the thermodynamic driving force and greatly promoted the Al extraction. This study is of some theoretical significance for guiding the thermal activation and acid leaching of coal gangue. Graphical
研究领域:
矿物加工
·
材料科学
·
冶金学
·
热力学
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高影响因子
危险品化学品经营许可证（带存储）