CHEMICAL ENGINEERING JOURNAL
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2012
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IF 3.461
Bo Yang,Shubo Deng,Gang Yu,Yonghong Lu,Hong Zhang,Jianzhong Xiao,Gang Chen,Xiaobing Cheng,Lili Shi
Nanoscale Al particles with average diameter of about 100 nm were employed to prepare Pd/Al nanoparticles (NPs) by chemical displacement deposition. It was proved that Pd 2+ acidic deposition solution was superior to its alkaline deposition solution in terms of Pd loading rate on Al NPs. The Pd/Al NPs were characterized by ICP–OES, SEM, TEM, XRD, BET and then used to explore hydrodechlorination (HDC) performance of 3-chlorophenol (3-CP) in aqueous solution. Major factors affecting HDC efficiency were investigated including Al substrate sizes, pH, Pd loadings in Pd/Al NPs, dosage of Pd/Al NPs, and temperature. The optimal results indicated that nanoscale Pd/Al bimetallic particles were highly effective for 3-CP HDC. HDC efficiency was only about 30% in 50 min reaction with micron sizes of Pd/Al particles (100–400 mesh), whereas it increased to 99.7% within 30 min using Pd/Al NPs at 25 °C. Aqueous pH presented remarkable effect on HDC and pH 3–4 was the optimum range for HDC as pH varied from 2 to 11. Pd loadings and Pd/Al dosages were optimized for highly effective HDC as 1.16 wt.% and 2 g/L, respectively. In addition, higher HDC performance was obtained while reaction temperature arrived at 45 °C and 0.389 mM of 3-CP could be completely dechlorinated into phenol only within 10 min reaction.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2014
·Vol. 97
·期 11
·3555-3560
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IF 2.428
Songping Wu,Juanjuan Xue,Yingxian Fan
Spinel Mg(Al 1− x Ga x ) 2 O 4 ( x = 0–1) solid solutions were synthesized via solid-state method. Replacement of Al 3+ by Ga 3+ in MgAl 2 O 4 gave rise to the expansion of the lattice, as well as blueshifts of FT-IR and Raman peaks. The homogeneous solid solutions, high relative densities, large grain sizes, and compact microstructures resulted in excellent microwave dielectric properties for spinel Mg(Al 1− x Ga x ) 2 O 4 ( x = 0.6) ceramics sintered at 1485°C: that is, ε r = 8.87, Q × f = 107 000 GHz (at 14.8 GHz), and τ f = −16 ppm/°C. Spinel-structured Mg(Al 1− x Ga x ) 2 O 4 ( x = 0–1) solid solutions possessed low sintering temperatures, wide temperature regions (~100°C), and small negative τ f values. These outstanding performance make Mg(Al, Ga) 2 O 4 a promising candidate material for millimeter-wave devices.
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CATALYSIS TODAY
·
2017
·
IF 4.636
Yuexin Peng,Ling Zhang,Long Chen,Dingzhong Yuan,Guoxiong Wang,Xiangju Meng,Feng-Shou Xiao
Catalytic combustion of toluene has been widely investigated due to importance of abatement of volatile organic compounds (VOCs), and in this work we have successfully prepared highly efficient heterogeneous catalysts for toluene combustion by impregnation of manganese oxides with Al-rich Beta zeolites (Beta-SDS) with H-form (MnO x /H-Beta-SDS) and K-form (MnO x /K-Beta-SDS) as well as pure siliceous Beta zeolite (MnO x /Si-Beta). Catalytic tests show that these zeolite-supported catalysts have higher activities than alumina-supported manganese oxides (MnO x /Al 2 O 3 ). By comprehensive consideration of reducibility, adsorbed oxygen species, and lattice oxygen species in the catalysts, it is shown that the adsorbed oxygen species play more important roles than others for the catalytic activity. The good catalytic performance and understanding of active sites over the MnOx/H-Beta-SDS might be helpful for preparation of catalysts in VOCs abatement.
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Journal of Nanomaterials
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2015
·
IF 1.644
Jun-qin Wang,Jian-feng Gao,Zhi-gang Wu,Guo-li Ou,Yu Wang
The research on hydrogen generation and application has attracted widespread attention around the world. This paper is to demonstrate that sodium aluminum hydride can be synthesized under simple and mild reaction condition. Being activated through organics, aluminum powder reacts with hydrogen and sodium hydride to produce sodium aluminum hydride under atmospheric pressure. The properties and composition of the sample were characterized by FTIR, XRD, SEM, and so forth. The results showed that the product through this synthesis method is sodium aluminum hydride, and it has higher purity, perfect crystal character, better stability, and good hydrogen storage property. The reaction mechanism is also discussed in detail.
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Materials Today Communications
·
2024
·
IF 3.7
Zhengliang Deng,Yajun Wang,Ruihua Liu,Wenyu Li,Qiang Gan
In order to improve the overall performance of traditional thermite, Al/B/Fe 2 O 3 composite thermites were synthesized using electrophoretic deposition technology. The morphology, structure, composition, thermal reaction properties, reaction process, and reaction activity were investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), X-ray energy dispersive spectrometry (EDS), X-ray diffractometer (XRD), and simultaneous thermal analyzer (TG-DSC). The results indicate that the components of the prepared Al/B/Fe 2 O 3 composites were uniformly distributed and closely interconnected, with the preparation process not altering the composition and structure of the components. Compared with Al/B/Fe 2 O 3 thermite prepared by physical mixing and Al/Fe 2 O 3 thermite by electrophoretic deposition, the Al/B/Fe 2 O 3 thermite prepared by electrophoretic deposition exhibited a lower reaction onset temperature (524.9 ℃), higher heat release (1240.9 J·g −1 ), and greater reactivity ( E a =168.3 kJ·mol −1 ). These findings underscore the significant enhancement effect of boron addition and the electrophoretic deposition method on the overall performance of Al/Fe 2 O 3 thermite. Analysis of the reaction mechanism reveals that the Al/B/Fe 2 O 3 composite thermites underwent a series of complex transformations, including thermite reactions, alloying reaction between Al and B, direct oxidation reactions of Al, B, Fe, and nitriding reaction of B, within the temperature range of thermal analysis from room temperature to 1100 ℃. These results provide crucial support for material innovation, performance optimization, and application expansion of thermites.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wenchen Ren,Huanxi Wang,Qianlin Zhang,Mengchi Chen,Zhongrui Li,Huan Guo,Jing Bai,Xiaomin Dai,Santosh Kumar Verma,Yunhua Xu
In this paper, petal sheet layered Co-Al bimetallic hydroxides were prepared using the hydrothermal method using methanol as a solvent. Pt/Co-Al-O catalysts were produced after the impregnation method and H 2 reduction. This catalyst was applied to the dehydrogenation reaction process of methylcyclohexane to toluene. A fixed-bed reaction device carried out comparative tests of this series of catalysts, and the effect of Co addition on the performance of Pt/Co-Al-O catalysts was investigated in detail. Among them, the Pt/Co 3 -Al 1 -O catalyst showed the best performance with high toluene selectivity throughout the dehydrogenation process. The MCH conversion started to be greater than 90% at 330 °C, and the hydrogenolysis rate was 262.7 mmol/g Pt /min. The conversion gradually increased with the reaction temperature, and the conversion could reach 99.5% at 410 °C. The appropriate introduction of Co element can reduce the excessive strong acidic sites of Al 2 O 3 itself and retain a certain number of weak acidic sites, while the bimetallic hydroxide carrier improves the dispersibility of the active component, reduces its particle size, and forms a certain strong interaction between the carrier and Pt. The final conversion of the catalyst decreased by about 2% in the 100 h stability test at 380 °C, which indicated that the Pt/Co 3 –Al 1 –O catalyst had strong coking resistance and good stability. These results indicate that the Pt/Co–Al–O series catalysts have potential industrial applications in hydrogen energy utilization.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Huibin Liu,Xiao Chen,Shiyao Liu,Yan Du,Wenjun Zhu,Zhengwen Hu,Marc Armbrüster,Changhai Liang
Using the low-temperature molten salt strategy, Al–Ni intermetallic compound catalysts (AlNi, Al3Ni2, and AlNi3) with efficiently separated nickel sites are successfully prepared by reducing the oxides of stoichiometric mixtures of the corresponding elements. Applying these materials as catalysts in the semihydrogenation of phenylacetylene to styrene suggests that the AlNi3-derived catalyst exhibits superior catalytic performance, achieving a remarkable styrene selectivity of 88% at a high conversion of phenylacetylene (99%). In conjunction with reaction kinetics, in situ infrared (IR) measurements, and density functional theory (DFT) calculations, the electron-rich Ni active center, created through electron transfer from Al atoms, plays a pivotal role in reducing the surface adsorption energy of styrene and thus enhancing the semihydrogenation selectivity. In addition, the magnetic AlNi3-derived catalysts exhibit excellent stability and can be easily separated by using a magnet.
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Molecular Catalysis
·
2024
·
IF 3.9
Xiaoyu Yan,Xiaoqing Xu,Yuhan Sun,Xiuyi Li,Jiale Xu,Renjie Ji,Rui Huang,Chunyi Li
Compared with propane dehydrogenation (PDH) technology, oxidative dehydrogenation (ODH) of propane is an effective way to break through the thermodynamic constraints, which has changed the endothermic reaction into exothermic. Meanwhile, coking in PDH was significantly reduced by the presence of an oxidant in ODH of propane. Therefore, ODH of propane has attracted wide interest and has been studied in recent years. However, the contradiction between the conversion of propane and the selectivity of propene was the intrinsic problem of ODH of propane that required further study. In this work, a novel aluminum/potassium-doped mixed metal oxide catalyst Mo 1 V 0.5 Al 0.02 K 0.03 O x was synthesized using a simple co-impregnation method, whose selectivity for propene (83.2 %) and conversion of propane (12.7 %) at 300 °C were the best among all other alkali metal/alkaline-earth metal-doped catalysts. The further discussion illustrated that doping potassium and alumina could synergistically adjust the density of acid sites on the catalyst, establishing an equilibrium between high propane conversion and the ideal propene selectivity. After modification, the density of Brønsted acid decreased, leading to an enhancement in the selectivity of propene. Simultaneously, the addition of steam in the feed gas promotes propene to oxygenates and improves the conversion of propane under the condition of constant contact time.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yunlong Yao,Peng Zhang,Yao Wang,Zhou Du,Zhichao Sun,Ying-Ya Liu,Anjie Wang
This study investigates the catalytic hydrogenation of biomass-derived furfural to value-added products, especially tetrahydrofurfuryl alcohol and furfuryl alcohol. A series of Ni-Fe-Al composite catalysts were synthesized through co-precipitation and subsequent hydrogen reduction. Among these, the Ni 5 Fe 1 Al 2 catalyst demonstrated extraordinary catalytic performance, achieving complete furfural conversion and 92.9 % tetrahydrofurfuryl alcohol selectivity under mild conditions (50 °C, 0.5 MPa H 2 ). Comprehensive characterization using XRD, TEM, and XPS revealed that the optimized Ni 5 Fe 1 Al 2 –400 catalyst possessed high dispersion and abundant oxygen vacancies. The addition of pyridine in the feed had a great impact on the hydrogenation rate of furfuryl alcohol but much less on that of furfural. With pyridine in the feed, the main product shifted from tetrahydrofurfuryl alcohol to furfuryl alcohol, while maintaining complete furfural conversion and achieving 97.5 % furfuryl alcohol selectivity at 50 °C. The Ni 5 Fe 1 Al 2 –400 deactivated in the 50-h run and can be regenerated by simple in-situ reduction, demonstrating excellent regenerability. These findings provide valuable insights into the design of efficient catalysts for selective biomass conversion.
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LANGMUIR
·
2025
·
IF 3.9
Yi Tian,Wenbin Shi,Ping Yang,Xiao Zhang
Carbon dots (CDs) with high photoluminescence quantum yields (PLQYs) are expected to be used in sensors (e.g., metal ions and antibiotics). In this paper, aluminum-doped green-emitting CDs (M-Al-CDs) were prepared by a one-step solvothermal route using m-phenylenediamine. Al doping resulted in sample M-Al-CDs with enhanced green emission with a PLQY of 75.4% and related narrow photoluminescence (PL) spectra with a full width at half-maximum of 57 nm. The PLQYs of CDs increased by 2.3 times after Al doping. This phenomenon is ascribed to Al as a network former that can enter the carbon frameworks of CDs to affect the microstructure and PL. Highly crystalline CDs were created after Al addition, suggesting that the number of surface defects decreased and the radiation recombination efficiency increased. In addition, positive Al ions possess powerful coordination ability with the negative functional groups on the surface of CDs to further decrease nonradiational recombination, in which the Fourier transform infrared spectra of samples confirmed such interaction. Furthermore, these CDs also revealed excellent photo- and thermostability even after being stored at room temperature for 240 days. Sample M-Al-CDs exhibited a static quenching response to Cu2+ ions and oxytetracycline with detection limits of 0.1 and 1.0 μM, respectively. The specific detectability of M-Al-CDs for Cu2+ ions and oxytetracycline is related to the formation of stable complexes between M-Al-CDs and Cu2+ ions as well as to the interaction between Al ions and oxytetracycline. These results indicate an effective approach for the application of CDs as sensors.
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PubMed
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2025
·
IF 2
Liang Zhang,Chen Zhao,Zuohui Xu,Yuhuai Shi,Erhai An,Jinhu Liang,Xiong Cao
Al is widely used in solid propellants for its high energy density. (C 6 H 14 N 2 )[NH 4 (ClO 4 ) 3 ]（DAP-4）, a novel energetic material, exhibits excellent detonation performance, thermal stability, oxidizing capacity, and cost efficiency, making it a promising high-energy oxidizer. This study investigated the ignition and combustion properties of DAP-4/nano-Al mixtures. DAP-4 was synthesized via a one-pot molecular self-assembly strategy, and mixtures with varying Al ratios (10%–30%) were prepared through mechanical mixing. X-ray diffraction (XRD) confirmed that the mixed powders retained their original crystalline structures without the formation of new phases. Scanning electron microscopy (SEM) revealed that nano-Al particles adhered effectively to DAP-4 surfaces, with higher Al content increasing the particle coverage. Elemental mapping and EDS were used to further characterize the surface morphology changes. Thermogravimetry-Differential Scanning Calorimetry（TG–DSC） indicated good compatibility between DAP-4 and nano-Al, with minimal mutual interference during thermal decomposition. Ignition experiments were conducted in a shock tube under temperatures (2200–3100 K) and pressures (0.1 and 0.5 MPa). The results showed that in the DAP-4/nano-Al mixtures, an increase in the Al fraction caused a decrease in the ignition delay time and an increase in the burn time. Simultaneously, the reaction in the presence of Al changed qualitatively, as is apparent from the changed activation energies. Compared to the combustion of neat DAP-4, both the ignition delay and burn times could be longer or shorter, depending on the Al fraction. This study demonstrated that the addition of nano-Al effectively enhanced DAP-4 combustion. In practice, DAP-4's ignition and combustion can be controlled by adjusting the nano-Al mass fraction.
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ChemistrySelect
·
2025
·Vol. 10
·期 33
·e03600
·
IF 2
Jiaqin Wang,Fang Li,Yasi Wang,Wei Huang
Graphical The Al-doped ZnO catalyst has a lower work function, which is conducive to promoting the dissociation of CH x O* to form CH x *; it also facilitates the generation of Zn x+ and oxygen vacancies, which further promotes the generation of C 2+ OH. The direct conversion of syngas into C 2+ OH has attracted significant attention as a potential pathway for energy conversion. However, this process typically requires the use of precious metals or the collaborative action of multi-component catalysts, making it relatively complex. In this paper, simple and economical Al-doped ZnO catalysts were employed for the synthesis of C 2+ OH. The results show that the work function, Zn x+, and the relative content of oxygen vacancies are linearly related to C 2+ OH/ROH. When the doping amount was 7 mol%, the catalyst had the highest C 2+ OH/ROH (82.6 wt%), corresponding to the lowest work function value, the highest Zn x+ content, and the relative content of oxygen vacancies. We reveal that the successful synthesis of C 2+ OH depends not only on the low work function of the Al-doped ZnO but also on the existence of the oxygen vacancies and Zn x+ sites. Specifically, the low work function induced by Al doping facilitates electron transfer in the reaction, facilitating the dissociation of CH x O* into CH x *. Meanwhile, the presence of oxygen vacancies enhances the dissociative adsorption capacity of CO and facilitates the formation of CH x * species. The Zn x+ sites serve as active centers for carbon chain growth, promoting C–C coupling through the insertion of CO or CH x O* into CH x *, thereby achieving chain elongation.
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