Molecular Catalysis
·
2017
·
IF 0
Shuang Chu,Li’na Yang,Xingcui Guo,Linlin Dong,Xiufang Chen,Yaru Li,Xindong Mu
The catalytic behavior of a series of MFI catalysts with different Si/Al ratio (25–300) in the direct aqueous-phase hydrolysis of α-cellulose was studied. The effects ultrasonic pretreatment time, ZnCl 2 content, zeolite pore structure and acid-basic properties on catalyst activity and products distribution were systematically investigated. The results indicated that HZSM-5 with lower Si/Al ratio was beneficial for production of glucose and LA from α-cellulose. Ultrasonic pretreatment could decrease the degree of crystallinity and polymerization of α-cellulose, enhance the accessibility of acid sites and ZnCl 2 to the loosened amorphous regions of α-cellulose in water, and improve the hydrolysis efficiency of α-cellulose. The desilicated ZSM-5 (HZSM-5-DS(0.2)) showed much higher catalytic activities as compared to commercial ZSM-5 and α-cellulose conversion reached 76.5% over HZSM-5-DS(0.2) at 200 °C. Catalytic conversion of α-cellulose consisted of at least three important parallel reactions under the present hydrothermal conditions and a plausible pathway was proposed. Effective control of these reactions would be helpful to further maximize the target product yield during the catalytic conversion of α-cellulose.
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DOI
Green Energy & Environment
·
2020
·
IF 6.395
Jiajun Liu,Kui Wu,Zhengke Li,Wensong Li,Yuqing Ning,Weiyan Wang,Yunquan Yang
The great challenge in the aldol condensation of tailored fermentation products (acetone–butanol–ethanol, ABE) into energy intensive fuels is to develop a suitable catalyst with high activity and low–cost. In this study, Co, Ni, and Co–Ni supported on Mg–Al oxide catalysts were prepared and their pore diameters were enlarged via adding active carbon as a hard template into Mg–Al hydrotalcite. During the aldol condensation reaction, the catalyst activity was enhanced after enlarging the pore diameter and Co–Ni bimetal supported catalyst presented the highest activity, which was resulted from that the electron transfer between Co and Ni in Co–Ni alloy enhanced the dehydrogenation activity and large pore lowered the mass transfer resistance. After optimizing the reaction conditions, acetone conversion and the total selectivity of C 5 –C 11 desired products in the aldol condensation of ABE reached up to 76% and 90%, respectively. The stability study showed that the activity was decreased with the increase of reaction number because of the oxidation of metallic Co and Ni, but this could be solved via a simple hydrogen reduction method.
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DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 8
·2443-2451
·
IF 5.721
Cong Mao,Jingwei Zheng,Babasaheb M. Matsagar,Ranjith Kumar Kankala,Tansir Ahamad,Yucheng Yang,Kevin C.-W. Wu,Xueqin Zhang
Ruthenium nanoparticles supported onto aluminum-doped mesoporous silica catalysts (Ru/Al–SBA-15) are fabricated using hydrothermal and impregnation methods for catalysis application. The Ru/Al–SBA-15-3 catalyst at a Si/Al molar ratio of 3 exhibited excellent catalytic performance for the hydrogenation of p-phthalic acid with high conversion efficiency (100.0%) and cis-isomer selectivity (84.0%) in water. Moreover, this system displays exceptional stability and recyclability through preserving the conversion efficiency, as well as a cis-isomer selectivity of 90.2 and 83.3%, respectively, after reusing it fourteen times. Such an exceptional system can also be ideal for the hydrogenation of aromatic dicarboxylic acids and their ester derivatives in water. Strong Lewis acid sites due to doped Al species play significant roles in the hydrogenation reaction. Moreover, isotope labeling studies indicated that water molecules effectively participated in the hydrogenation reaction. Hydrogen and water contributed half of the hydrogen atoms for this hydrogenation reaction. In the end, a plausible mechanistic pathway for the hydrogenation of p-phthalic acid using the Ru/Al–SBA-15-3 catalyst in water is proposed.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xuan Liu,Hao Guo,Jilai Xue,Zengjie Wang,Yanan Zhang,Xiang Li
Al-7Si-0.8Sc-0.6Ce alloys were prepared with combined addition of low-cost Ce and high-priced Sc through molten salt electrolysis with controlled cooling process. The phases of as-casted alloys consisted of α-Al, eutectic silicon , ternary AlSi 2 Sc 2 and CeAl 2 Si 2 . Rapid cooling transformed the huge hollow ternary AlSi 2 Sc 2 blocks (300–500 µm) into fine Al 3 Sc particles (dozens of μm), and simultaneously refined the AlSi 2 Sc 2 with reducing its interlayer thickness from 15.26 µm down to 1.94 µm (the cooling rate from 0.05 K s −1 up to 30 K s −1 ). The eutectic Si became fine fibrous-like clusters and the thickness of CeAl 2 Si 2 phase reduced by 62.6 % when the cooling rate reached 30 K s −1 . Micro-hardness measurement and first principles-based calculation were applied for evaluating the individual mechanical performance of each phase in the alloy. The calculated Young’s modulus (E) suggests that Al 3 Sc (E = 168 GPa), AlSi 2 Sc 2 (E = 178 GPa) and CeAl 2 Si 2 (E = 39.2 GPa) can toughen Al-matrix (E = 30.6 GPa). The rapid cooling (30 K s −1 ) strongly enhances all phase components but diminish the huge hollow AlSi 2 Sc 2 blocks (ultrahigh micro-Vickers hardness ∼ 780 HV), making a homogenous Al-RE alloy with improved mechanical property (68 ∼ 84 HV balanced among phase components). The refining mechanisms on the improved mechanical performance are also discussed.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Lanlan Guo,Yanji Feng,Feng Shi,Wei Zhao,Hua Zeng,Tingyu Chen,Yingli Yang,Guodong Wang,Xiaolian Liu,Yan Wang,Xueli Yang
In this work, pure NiO, Al-doped NiO, W-doped NiO and a series of Al/W co-doped NiO nanoflowers were successfully prepared through a simple solvothermal method . Various characterization methods, such as XRD , SEM, TEM, HRTEM and XPS , were used to confirm the physical and chemical properties of the sensitive materials in terms of micro-nano structures, compositions and elemental distributions. The as-obtained Al/W co-doped NiO showed a nanoflower structure with an approximate size of ∼ 200 nm. What's more, among six sensors constructed from the sensitive materials, the sensor based on 3 at% Al 3+ /3 at% W 6+ co-doped NiO (3Al3W-NiO) achieved the highest response (R g /R a =112) toward 100 ppm triethylamine with a low detection limit (1 ppm) at 325 ℃. Besides, this sensor also exhibited excellent response/recovery characteristics and long-term stability. These favorable sensing performances of the 3Al/3 W co-doped NiO sensor are not only modulated by the initial resistance (R a ), but are also closely related to the large specific surface area , porous structures , low crystallinity , rich oxygen vacancies and high Ni 3+ /Ni 2+ ratio in the composite nanomaterials.
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高影响因子
ENERGY
·
2020
·
IF 6.082
Ming Su,Haiping Hu,Jianchang Gan,Wenhua Ye,Wenhua Zhang,Huihu Wang
Real-time hydrogen production at low temperature can effectively solve the problem of hydrogen storage and transportation in cold area and plateau region . In this study, a novel Al alloy/NaCl/g-C 3 N 4 composite with enhanced low temperature reactivity for hydrogen production has been synthesized by mechanical ball milling method. The feasibility of Al-water reaction at the temperature of 253.15–373.15 K was firstly proved by thermodynamic calculation . The hydrogen generation performance was studied in tap water at 298.15 K and 23 wt% NaCl aqueous solution at low temperature of 253.15–273.15 K. The results indicated that the addition of g-C 3 N 4 can effectively promoted the hydrolysis of activated Al composites. Hydrogen yield of Al alloy/NaCl/g-C 3 N 4 composite with 1 g of g-C 3 N 4 addition reached 1006 mL·gAl −1 and the induction time of reaction was 90 s at 253.15 K, while that of Al alloy was only 230 mL·gAl −1 and 1120s respectively. It was supposed that the addition of g-C 3 N 4 effectively reduced the size of NaCl particles and promoted their uniform distribution in Al matrix and more cracks were generated. The kinetics and reaction mechanism using Al alloy/NaCl/g-C 3 N 4 composite were discussed. This study provides a new idea for the synthesis of Al composites with high reactivity at low temperature.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 11
·117501
·
IF 4.386
Zhenhua Liu,Qiangbing Liu,Dan Liao,Jingang Yu,Xinyu Jiang
We have developed a Ni-Al layered double hydroxide (LDH) and carbon black (CB) composite for the selective electrochemical detection of hydroquinone (HQ) and catechol (CT). LDH exhibits multiple active sites and high adsorption capacity for phenolic substances. CB demonstrates high conductivity and electrocatalytic capacity. The crystal structure was characterized by X-ray diffraction, establishing the successful synthesis of flower-like LDH, and the successful combination of LDH and CB. Fourier-transform infrared spectroscopy confirmed that the LDH surface contained sufficient hydroxyl groups to adsorb CT and HQ. The morphology of LDH/CB was characterized by scanning electron microscopy, and the composition and valence confirmed by X-ray photoelectron spectroscopy. The LDH/CB sensor delivered excellent performance in terms of sensing HQ and CT, with a wide detection range (0.1–150 μM) and detection limits of 0.011 and 0.0091 μM (DL = 3.3σ/S), respectively. The excellent performance of this sensor makes it a reliable choice for detecting HQ and CT in water.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 13
·A3292
·
IF 3.259
Jiguo Tu,Shubo Wang,Shijie Li,Chen Wang,Dongbai Sun,Shuqiang Jiao
The need of an efficient and sustainable way to store energy is an urgent necessity. Unfortunately, due to the cost and limited resources of lithium, the use of the most mature Li-ion batteries for grid-scale storage of renewable energy production is nowadays going on slowly. Here, a low-cost, high-capacity Al/graphite rechargeable aluminum battery was explored based on molten AlCl3-NaCl liquid electrolyte. The battery shows a specific capacity of above 200 mAh g−1 at a current density of 100 mA g−1, even maintaining at 111.4 mAh g−1 at a higher current density of 1000 mA g−1 over 1000 cycles, with a Coulombic efficiency of 94.6%. Raman spectroscopy and X-ray photoelectron spectroscopy reveal that AlCl4− and Al2Cl7− anions are intercalated between graphite layers at the graphitic carbon cathode, meanwhile Al2Cl7− anions are transformed into metallic Al and AlCl4− anions at the Al anode. The inherent low-cost and low-flammability, as well as the most outstanding high capacity, long-term cycling stability and Coulombic efficiency, are particularly favorable for grid-scale storage of renewable energy.
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高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 5
·056519
·
IF 1.62
Yanqing Xue,Qitang Hao,Bo Li,Xinliang Wang,Chengze Yin,Han Zhang
To surmount the longstanding puzzle of strength-ductility trade-off, efforts had been made to apply Mg - Ag microalloying on 5%TiB2/Al-4.5%Cu composites by in situ molten salt reaction and subsequent heat treatment. The obtained composites achieve an eye-catching tensile elongation (δ) of 6.1 ± 0.4%, while maintaining elevated ultimate tensile strength (UTS) of 497 ± 4 MPa and yield strength (YS) of 401 ± 3MPa. Comprehensive characterization demonstrated that the uniformly distributed TiB2 particles together with semi-coherent grain boundaries between the α-Al matrix and reinforcement phase (TiB2 particles, Ω-Al2Cu, σ-Al5Cu6Mg2) facilitated the dislocation motion integrally, which eliminated the stress concentrations, may be the main reason for amelioration in the strength-ductility trade-off of the composites when subject to rigorous multi-step heat treatment.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 11
·6577-6585
·
IF 3.9
Yuting Zhang,Huan Tu,Guoying Zhao,Jingshan Hou,Yufeng Liu,Xin Qiao,Zhongzhi Wang,Bo Li,Ji-Guang Li,Feng Wang,Yongzheng Fang
Compared with other fluorescent crystal phases, garnet has better structural stability in a glass matrix and renders precisely controllable emissions due to the abundant lattice control positions. In this work, we regulate the coordination field of Ce 3+ ion based on the co-substitution method and achieve the spectra regulation in the yellow–green range. We used Ba 2+ –Si 4+ cations to replace Y 3+ –Al 3+ cations in Y 3 Al 5 O 12 (YAG) matrix to obtain blue-shift of the emission peak from 552 to 539 nm. The centroid shift and crystal field splitting decrease with the decreasing covalency of the bond between the Ce 3+ ion and the surrounding anions owing to the higher electronegativity of Si 4+ ions than Al 3+ ions. The corresponding fluorescent films were prepared by a low-temperature co-sintering process based on the as-made Ba 2+ –Si 4+ co-substituted phosphor. X-ray powder diffractometer and scanning electron microscopy images showed that the fluorescence crystals were less eroded and evenly dispersed in the glass matrix. Spectral analysis showed that the garnet phase was protected by using lead-free borosilicate glass with a low melting point, and the quantum efficiency of phosphor-in-glass (PiG) retains 98% of the corresponding phosphor. By adjusting the ratio of garnet phosphor to commercial red nitride phosphors, a warm white fluorescence with a color rendering index of 80.3 and color temperature of 3899 K was obtained. The prepared warm white film has potential application value in the whole spectra field.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Dezhi Qin,Guangrui Yang,Li Zhang
The Al-doped Fe 3 O 4 /hydroxyapatite (HAP) nanocomposites prepared in pectin matrix was employed as adsorbent that offers high adsorption capacity for fluoride, magnetic separability and good stability. Powder X-ray diffraction and transmission electron microscopy characterizations were used to determine the structure and morphology of as-prepared samples. The needle-like Al-doped Fe 3 O 4 /HAP nanocrystals were coated with pectin molecules, which not only induced the nucleation, but inhibited the further growth of nanocrystals. The results of thermogravimetric analysis and Fourier transform infrared spectra showed that the obtained products are organic–inorganic nanocomposites; and the Al doping in composites increased the amount of hydroxyl groups, which could supply more adsorption sites for fluoride. In bath experiments, the adsorption capacity of Al-doped samples was significantly higher than that of pure HAP due to the high affinity of aluminium toward fluoride. The effect of reaction parameters such as pH, calcination temperature, co-existing anions and Al/Ca molar ratio on the adsorption capacity was also investigated to determine optimum adsorption condition. The Al-doped Fe 3 O 4 /HAP nanocrystals exhibited high adsorption rate for fluoride during the first 30 min and reached equilibrium within 80 min. The adsorption kinetics and isotherms were well-fitted by the pseudo-second-order kinetic model and the Freundlich isotherm model, respectively. In addition, the adsorption mechanism of fluoride on Al-doped Fe 3 O 4 /HAP nanocomposites was investigated, which can be mainly attributed to electrostatic attraction and ion-exchange.
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高影响因子
COMBUSTION AND FLAME
·
2025
·
IF 6.2
Xiandie Zhang,Haozhe Li,Xuxu Cui,Xinwen Ma,Jiaming Liu,Xiaode Guo,Xiang Zhou
The passivation layer of Al powder hinders the mass transfer during Al combustion. Fluorinated oxidants, such as metal fluorides and fluoropolymers, substantially improve the combustion behaviour of Al powder. Herein, a simple solvothermal method is employed to produce a high-entropy acicular accumulational fluorine-containing oxidiser based on ammonium fluoroferrates. The characterization results indicate that heating the fluorine-containing oxidiser can release gaseous products of HF and NH 3 . HF etches the passivation layer, and NH 3 provides kinetic energy to the fuel, resulting in multiple hot spots and secondary combustion as well as prevention of reaction sintering. Compared with traditional FeF 3 , this novel fluorine-containing oxidiser considerably improves the combustion of Al powder by reducing its onset temperature as well as increasing its exothermic enthalpy, flame area and F release ability.
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高影响因子
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