CERAMICS INTERNATIONAL
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2020
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IF 3.83
Xiaoyu Yang,Xuanxuan Lei,Shaokun Tang
A simple hydrothermal method is utilized to fabricate hierarchically olive-like γ -Al 2 O 3 using ionic liquid [Bmim]BF 4 as the structure directing agent . The olive-like γ -Al 2 O 3 presents uniform morphology with the average diameter of 500 nm and rich mesopores. As template, ionic liquid [Bmim]BF 4 plays a crucial role in the controllable morphology of the product. [Bmim]BF 4 is absorbed on the AlOOH nanoparticles surface via the H-bond interaction and induces crystalline oriented growth. Then the forming AlOOH nanosheets self-assemble into olive-like hierarchical structure through π–π stack interaction. Given that the structure advantage of the olive-like γ-Al 2 O 3 and the limited study concerning cerium-based catalysts in Fenton-like reaction, nano-CeO 2 / γ -Al 2 O 3 supported catalyst is prepared and used in Fenton-like degradation for the first time. The result suggests that the olive-like γ -Al 2 O 3 support not only reduces the surface energy with more uniform CeO 2 (ca. 4–5 nm) dispersion but also improve the concentration of Ce 3+ active sites. The CeO 2 / γ -Al 2 O 3 catalyst displays superior catalytic activity for the degradation of Orange II (AO7) compared with pure CeO 2 nanoparticles.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Menghui Chu,Yafei Fan,Zhaoli Sun,Dezhi Kong,Jianfei Yao,Guanyun Zhang,Shouqing Ni,Yifeng Wang
The environmental transformation and fate of nanomaterials are critical for their consequences. Although Ag nanoparticles (Ag NPs) are frequently detected in the environment, their transformation and fate, particularly in relation to sediment or mineral surfaces, remain poorly understood. In this study, we investigated the behaviors of Ag NPs on γ-Al 2 O 3 , a model mineral, under environmentally relevant aqueous conditions. We discovered that Ag NPs gradually diminished during light irradiation, ultimately transforming into ultrasmall NPs, clusters, and single atoms. The newly formed secondary Ag 0 on the surface of γ-Al 2 O 3 exhibited low sunlight absorption but high dissolution activity. A chemical equilibration was established quickly between Ag + in the solution bulk and Ag 0 on the γ-Al 2 O 3 surfaces, but dynamic exchange between Ag + and Ag 0 continued to evolve Ag 0 speciation afterwards. Light drove these processes, with O 2 involved. The dynamic exchange persisted continuously, although its rate could be influenced by environmental parameters. Synopsis In a simulated environmental photochemical process, Ag 0 and Ag + undergo rapid dynamic exchange, leading to the downsizing of Ag nanoparticles on γ-Al 2 O 3 surfaces into ultrasmall nanoparticles, clusters, and single atoms.
研究领域:
环境科学
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纳米科技
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化学
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产品关联
DOI
PubMed
高影响因子
ChemistrySelect
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2022
·Vol. 7
·期 45
·e202203339
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IF 2.307
Junjie Zhang,Zhourong Xiao,Li Wang,Xiangwen Zhang,Guozhu Li
Graphical The key role of Ni valence state on the catalytic SMR performance of Ni/Al 2 O 3 is reported. Ni 0 /Ni 2+ ratio on Ni/Al 2 O 3 is individually regulated by changing the reduction temperature while maintaining the states of nickel particles and support. A deep understanding is gained on how the Ni valence state of Ni/Al 2 O 3 affects the catalytic SMR performance. Steam methane reforming (SMR) is the most mature technology for hydrogen production in industry, and alumina supported nickel (Ni/Al 2 O 3 ) is the most widely used catalyst. Herein, the key role of Ni valence state on the catalytic SMR performance of Ni/Al 2 O 3 is reported. The ratio of Ni 0 /Ni 2+ on Ni/Al 2 O 3 is individually and effectively tuned by changing the reduction temperature after wet impregnation. Catalytic performance of Ni/Al 2 O 3 is greatly dependent on the surface concentration of Ni 0 and Ni 2+ . The catalyst reduced at 675 °C possesses balanced Ni 0 and Ni 2+ sites and exhibits superior catalytic performance, on which 60 % of methane is stably converted at 600 °C. CH 4 -TPD and CO-TPD profiles demonstrate that appropriate Ni 0 /Ni 2+ ratio can promote the adsorption of CH 4 and inhibit the moderate-strength adsorption of CO, which leads to increased SMR activity and selectivity.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
Nature Communications
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2024
·Vol. 15
·期 1
·1-12
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IF 14.7
Ma Xinlong,Yin Haibin,Pu Zhengtian,Zhang Xinyan,Hu Sunpei,Zhou Tao,Gao Weizhe,Luo Laihao,Li Hongliang,Zeng Jie
Acetone serves as an important solvent and building block for the chemical industry, but the current industrial synthesis of acetone is generally accompanied by the energy-intensive and costly cumene process used for phenol production. Here we propose a sustainable route for acetone synthesis via propane wet reforming at a moderate temperature of 350 o C with the use of platinum-tin nanoparticles supported on γ-aluminium oxide (PtSn/γ-Al 2 O 3 ) as catalyst. We achieve an acetone productivity of 858.4 μmol/g with a selectivity of 57.8% among all carbon-based products and 99.3% among all liquid products. Detailed spectroscopic and controlled experiments reveal that the acetone is formed through a tandem catalytic process involving propene and isopropanol as intermediates. We also demonstrate facile ketone synthesis via wet reforming with the use of different alkanes ( e.g ., n-butane, n-pentane, n-hexane, n-heptane, and n-octane) as substrates, proving the wide applicability of this strategy.
研究领域:
化学工程
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催化科学
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能源化工
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2026
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IF 3.5
Xiaofu Li,Tingfeng Xue,Junliang Ma,Zhibo Liu,Zejia Song,Bingyan Zhu,Liwei Pan,Jing Zhang
A bimetallic Mn-Co@γ-Al 2 O 3 catalyst was prepared • The catalyst effectively activates PMS for the mineralization of CIP • The catalyst enhances PMS activation via electronic, structural and active-site synergy • 1 O 2 is synergistically generated by LAS, oxygen vacancies and bimetallic redox cycles Ciprofloxacin (CIP) is recalcitrant to complete degradation by conventional treatment methods, and persulfate-based advanced oxidation processes often suffer low activation efficiency. In this study, a bimetallic Mn-Co@γ-Al 2 O 3 catalyst was developed to activate peroxymonosulfate (PMS) for the efficient mineralization of CIP. Under optimal conditions (1 mmol·L -1 PMS, pH=9), CIP was completely mineralized within 60 min. The catalytic activity of the bimetallic catalyst surpassed that of the single-metal Mn@γ-Al 2 O 3 and Co@γ-Al 2 O 3 , with a synergistic factor ( SF =1.12, >1) confirming a strong Mn-Co synergy. This synergistic effect results from coupled redox cycles, the inhibition of manganese oxide aggregation, and the presence of abundant Lewis acid sites and oxygen vacancies. The PMS system, primarily governed by singlet oxygen ( 1 O 2 ), effectively reduced the biotoxicity of CIP wastewater, increasing the germination rate of fescue seeds from 80% to 92%. A total of 14 degradation intermediates were identified. The excellent mineralization performance is closely associated with the unique CIP degradation pathway driven by 1 O 2 .
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产品关联
DOI
高影响因子
Applied Sciences-Basel
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2022
·Vol. 12
·期 19
·10101
·
IF 2.838
Han Gao,Weimin Kong,Shuyuan Zhou,Xuwei Wang,Qingrong He,Yanchun Dong
Chemical warfare agents (CWAs) are highly toxic and fast-acting and are easy to cause large-scale poisoning to humans and livestock after being released. The activated carbon used for CWAs adsorption has disadvantages of limited adsorption capacity, easy aging and deactivation. Metal oxides have environmental stability, and they are characterized by long lasting and broad spectrum when used for thermal catalytic decomposition. Therefore, in this study, the supported copper–cerium catalyst CuO-CeO2/γ-Al2O3was prepared using an equal volume impregnation method. The thermal catalytic decomposition performance was studied using sarin CWAs simulant dimethyl methyl phosphonate (DMMP) as the target compound. The results show that the CuO-CeO2/γ-Al2O3catalyst with a CeO2loading of 5% exhibited better thermal catalytic decomposition performance of DMMP. The catalyst provided protection against DMMP for 237 min at 350 °C; CuO was highly dispersed on CuO-5% CeO2/γ-Al2O3, and there was a strong interaction between Cu and Ce on CuO-5% CeO2/γ-Al2O3, which promoted the generation of surface-adsorbed oxygen, leading to a better thermal catalytic decomposition performance of DMMP. This study is expected to provide a reference for the study of catalysts for the thermal catalytic decomposition of CWAs.Keywords:nerve agent;dimethyl methyl phosphonate;thermocatalytic;CuO;CeO2;γ-Al2O3
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
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IF 6.4
Yuluo Chen,Jinpeng Luo,Hang Xu,Xinran Hou,Man Gong,Changshu Yang,HuiCong Liu,Xiuqin Wei,Lang Zhou,Chuanqiang Yin,Xiaomin Li
Owing to its excellent thermal stability, polyimide (PI) is regarded as one of the most promising alternatives among separators for high-safety lithium-ion batteries (LIBs). Unfortunately, the wettability of the PI separator to electrolytes is still undesirable. The complexation–hydrolyzation method was used to develop a composite membrane with a core–shell structure that anchors γ-Al2O3 nanoparticles on PI nanofiber (PI@γ-Al2O3) as an LIB separator. The effects of surface treatment on the physicochemical and electrochemical properties of PI composite membranes are studied in detail, using the pristine PI nanofiber membrane as a reference. The results show that the PI@γ-Al2O3 nanofiber membrane exhibits better physicochemical properties and electrochemical performances. Specifically, the wettability property of the PI@γ-Al2O3 nanofiber membrane is improved with an almost zero contact angle, which significantly meets the requirements of high-performance LIBs. Furthermore, the electrochemical performance of the PI@γ-Al2O3 nanofiber membrane also shows excellent comprehensive properties with the ionic conductivity improving from 0.81 to 1.74 mS cm–1. Besides, the PI@γ-Al2O3 nanofiber membrane maintains a long charge–discharge process with a capacity retention rate of 98% at 0.5 C after 100 cycles. Consequently, the aforementioned excellent performances illustrate that core–shell PI@γ-Al2O3 nanofiber membranes have a promising future for the safety and stability of LIBs.
研究领域:
材料科学
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能源存储
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纳米技术
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电化学
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产品关联
DOI
高影响因子
Molecular Catalysis
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2022
·
IF 5.089
Mingxun Han,Fanji Liu,Xiangxiang Li,Xiqing Zhang,Yiren Lu,Yanjun Lin,Lihong Zhang
A series of manganese-based catalysts supported on γ-Al 2 O 3 with low loading amount of manganese from 0.5% to 2.0% were prepared by incipient impregnating method. All catalysts were tested on non-oxidative dehydrogenation of isobutane at 600 °C. In order to explore physicochemical properties of all catalysts, various characterizations including XRD, H 2 -TPR, XPS, UV-vis, NH 3 -TPD and TG were carried out on manganese-based catalysts. The experimental results indicated that MnO x species were highly dispersed on γ-Al 2 O 3 support, and both Mn 2+ and Mn 3+ ions are main active species for isobutane dehydrogenation. The reduced catalyst 1.5%Mn/ γ -Al 2 O 3 exhibited the most optimal dehydrogenation performance among all catalysts, reaching at isobutane conversion of 36% and isobutene selectivity of 79%. The main reasons for the excellent activity and selectivity of 1.5%Mn/ γ -Al 2 O 3 were related to the high proportion of low valence manganese ions including Mn 2+ and Mn 3+ as well as the high concentration of medium strong acid sites and weak strong acid strength.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 5
·1088-1098
·
IF 3.552
Shang Hui,Guo Chong,Ye Pengfei,Zhang Wenhui
Catalytic hydrodesulfurization (HDS) technique is widely used for clean gasoline production. However, traditional HDS catalyst (CoMo/γ-Al 2 O 3 ) exhibits high hydrogenation performance of olefins (HYDO), resulting in the loss of gasoline octane number. To achieve high HDS/HYDO ratio, the key issue is to reduce the interaction between active metals and the support, therefore, in this research, the modified CoMo/γ-Al 2 O 3 catalysts with various boron amounts were investigated under traditional or microwave heating. The effects of preparing methods as well as boron amounts on the active phase, acidic properties and HDS catalytic activities were examined. Results show that the modification, especially under microwave treatment, can significantly weaken the interaction between the active component and the support by enlarging the surface area and pore diameter, and reducing the acidity of the support. As a result, the stacking numbers of MoS 2 slabs were obviously improved by the modification and microwave treatment, contributing to higher edge/ rim ratio, and resulting in higher HDS performance and selectivity to olefin.
研究领域:
催化化学
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能源化工
✓ 已验证
DOI
高影响因子
Particuology
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2024
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IF 4.1
Yufan Mo,Chunli Li,Huiyu Li,Wei Han,He Wen,Yinghong Han,Chunxia Che,Yongjun Feng
The pore structure of spherical alumina supports is closely related to the dispersion of catalytically active components and the diffusion of reactants. Maintaining excellent pore structure under strict reaction conditions is of utmost importance. In this work, spherical γ-Al 2 O 3 support with a bimodal pore structure, composed of macropores and mesopores, was successfully synthesized using dodecane as the pore-forming agent through the oil–ammonia column-shaping method. The morphology and internal pore structure of the alumina were found to be influenced by the amount of surfactant added and ultrasound treatment conditions. Notably, when concentration of surfactant was 4‰ and ultrasound voltage of 20 V was applied, the resulting γ-Al 2 O 3 -4‰-20 displayed a highly concentrated distribution of macropores with an average pore size of 100 nm, resulting in an impressive porosity of 69.21%. In contrast, the untreated sample of γ-Al 2 O 3 -0-0 only exhibited a mesoporous distribution with a porosity of 54.03%. Moreover, after being subjected to a hydrothermal treatment in a high temperature (600 °C) and high humidity (water vapor) environment for 120 h, the γ-Al 2 O 3 -4‰-20 sample maintained a high BET specific surface area of 170.9 m 2 g −1 and mercury intrusion porosimetry specific surface area of 263.3 m 2 g −1 .
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2017
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IF 3.094
Xiaoyao Qu,Fucheng Wang,Chunsheng Shi,Naiqin Zhao,Enzuo Liu,Chunnian He,Fang He
An aluminium matrix composite reinforced by in situ-generated gamma-Al 2 O 3 whiskers was fabricated from a simple Al-H 3 BO 3 system through cold pressing and sintering. The gamma-Al 2 O 3 whiskers with an average diameter of 20 nm and an aspect ratio of 10–15 were synthesized during the sintering process and homogeneously distributed in the Al matrix. As a result of the perfect lattice matching between gamma-Al 2 O 3 and the Al matrix, the gamma-Al 2 O 3 whisker is a desired reinforcement for the Al matrix, improving the ultimate tensile strength and hardness to 217 MPa and 43.5 HV, respectively, with a satisfactory ductility of 11%. Differential scanning calorimetry analysis shows that the growth of the whisker occurred at 550–650 °C, and the ball milling energy has a significant effect on whisker growth.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
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2020
·
IF 3.687
Juan Liu,Wen-Ying Li,Jie Feng,Xiang Gao
The hydrodenitrogenation of nitrogen-containing heterocycles over noble metals has fundamental importance for energy and environmental science. To develop more efficient catalyst, mechanistic investigation has been conducted with a method combining in situ Fourier transformation infrared experiments and density functional theory calculations in this work. The in situ experiments indicate flatly adsorbed pyridine molecules convert to pyridinium and α -pyridyl species at higher temperature on metallic Pt of Pt/γ-Al 2 O 3 catalysts. Pyridine hydrogenation distinctly takes place at 150 °C with the appearance of methylene stretching vibrations, and a stepwise mechanism is identified as the temperature further increases. The adsorption, hydrogenation and hydrogenolysis of pyridine on Pt are studied in detail by theoretical calculations. In line with these findings, the geometry optimization confirms pyridine preferentially adsorbs on Pt(111) and Pt(211) both in a parallel configuration. Based on the Langmuir–Hinshelwood mechanism, the results show successive hydrogenation markedly lowers the energy barrier for subsequent hydrogenolysis. The C N bond cleavage occurs via nucleophilic attack of pentahydropyridine, rather than piperidine, which determines the reaction products, including piperidine, n -pentylamine and n -pentane. The comparative study reveals both hydrogenation and hydrogenolysis are kinetically and thermodynamically more competitive on Pt(211) than Pt(111). Especially for hydrogenolysis, the coordinatively unsaturated Pt step atoms play an essential role in C N bond cleavage. Thus, hydrogenolysis is more geometric‒dependent than hydrogenation. This provides instructive information for the design of catalysts with adjustable product selectivity.
研究领域:
催化化学
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环境科学
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计算化学
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能源科学
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表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）