CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Yi-Si Feng,Cui Liu,Yu-Mei Kang,Xue-Mei Zhou,Liang-Liang Liu,Jin Deng,Hua-Jian Xu,Yao Fu
Biomass glycerol is an important raw material for many available chemicals, such as 1,2-propanediol (1,2-PDO). Hydrogenolysis of glycerol to 1,2-PDO is considered as a sustainable process with renewable potential application. In this paper, a series of bimetallic PdCu-KF/γ-Al 2 O 3 were prepared and the structures of catalysts were characterized by XRD, XPS, TEM and CO 2 -TPD. By measuring the activity of the catalyst, we found that PdCu-KF/γ-Al 2 O 3 (Pd:Cu:KF = 0.05:1:0.5) can be used as an efficient catalyst for hydrogenolysis of glycerol to 1,2-PDO, with 98.3% selectivity and nearly 100% conversion (200 °C, 2.5 MPa initial H 2 pressure, 20 h).
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高影响因子
ELECTROCHEMISTRY
·
2019
·Vol. 87
·期 3
·142-147
·
IF 1.293
Handong JIAO,Junxiang WANG,Donghua TIAN,Shuqiang JIAO
The electrochemical behaviour of Ti4+ (K2TiF6) at liquid tin and bismuth electrodes has been investigated by cyclic voltammetry, square wave voltammetry and chronoamperometry in the LiF–NaF–KF eutectic melt. Result shows that, on the liquid metal electrodes, the reduction reaction of the solvent occurs at more positive potential than that on the inert molybdenum electrode. There are two reduction steps including Ti4+ + e = Ti3+ and Ti3+ + 3e = Ti (Ti–Sn alloys) on the liquid tin electrode within the electrochemical window of the melt. However, only one redox process corresponding to the redox of the Ti4+/Ti3+ couple is observed at liquid bismuth electrode.
研究领域:
电化学
·
材料科学
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·E401
·
IF 3.12
Handong Jiao,Shuqiang Jiao,Wei-Li Song,Haosen Chen,Mingyong Wang,Jiguo Tu,Daining Fang
Owing to the low-cost and fast process, molten salt electrolysis is considered as a novel method to replace the Kroll process for preparing titanium. However, this process has not been fully realized because of the multi-step reduction and complicated disproportionation behaviors of multivalent titanium ions in melt. To address such critical problems, here we use liquid metals (Sn and Pb) as the cathode instead of solid metal cathode (Mo) during the electrolysis, in which the reduction process of Ti3+ (TiF63−) becomes a simple one-step process (Ti3+ + 3e = Ti (alloys)). Also, the deposition potential is more positive (>0.5 V) than that using solid Mo, owing to the depolarizing effect of the liquid metals. One-step process and depolarization behavior are favorable to increase the current efficiency, effectively decreasing the power consumption in comparison with the conventional electrolysis at solid metal cathodes. Similar to the electrolytic production of aluminum in Hall-Heroult system, there would be a continuous electrolysis process because the product is liquid alloy in this system.
研究领域:
材料科学
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电化学工程
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2026
·Vol. 55
·期 9
·7684-7697
·
IF 2.8
Wang Guangping,Li Jie,Liu Jianhua,Yang Zhenhua
The primary crystallization temperature of an electrolyte is a critical parameter in the aluminum electrolysis process, determining the operating temperature of the electrolytic process. Therefore, the initial crystallization temperature is one of the most critical physicochemical properties of the electrolyte in the electrolytic aluminum process. However, the Na 3 AlF 6 -AlF 3 electrolyte system, which is predominantly used in industrial electrolysis systems, operates at high temperatures. Lowering the electrolysis temperature would lead to numerous issues, including reduced current efficiency and increased cell voltage. Therefore, we propose low-temperature aluminum electrolysis in the Na 3 AlF 6 -K 3 AlF 6 -Li 3 AlF 6 -AlF 3 -KF-Al 2 O 3 electrolyte system. The synergistic effect of K 3 AlF 6 and Li 3 AlF 6 on the initial crystallization temperature within this system was investigated. Results indicate that at a cryolite molar ratio (CR) of 1.7–2, each unit of K 3 AlF 6 added reduces the initial crystallization temperature by an average of 2–4°C, while each unit of Li 3 AlF 6 added lowers it by an average of 0.5–3.5°C. Analysis of the cold-quenched electrolyte phases indicates the formation of phases such as Na 5 Al 3 F 14 , K 2 NaAlF 6 , and Na 2 LiAlF 6 within the electrolyte system. This study systematically measured the initial crystallization temperatures of the Na 3 AlF 6 -K 3 AlF 6 -Li 3 AlF 6 -AlF 3 -KF-Al 2 O 3 electrolyte system. It significantly advances the progress of the aluminum electrolysis industry toward green and low-carbon development, opening new technical pathways for achieving energy conservation and emission reduction targets in aluminum electrolysis production processes. Graphical
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Ali Reza Kamali,Jigang Yang
The effective disposal and/or utilization of polyethylene terephthalate ((C 10 H 8 O 4 ) n , PET) waste plastics are currently global problems that need to be addressed urgently. The current research examines the molten salt-based thermal treatment of PET waste, as a new approach to tackle this challenge. The effect of various molten salts, comprising KCl, MgCl 2 , ZnCl 2 , NaCl , KF and NaF on the structural and morphological evolution of PET upon heating in air to 1300 °C is investigated. PET is transformed into carbon materials with different characteristics, including graphene-like nanosheets and porous nanostructures , with different electrical conductivity values, depending on the type of salt employed. The melting and evaporation points, as well as the cation size of the salt, are found to have a significant influence on the morphology and the crystallization level of the carbon products, based on which the characteristics of PET-derived carbons are regulated. Accordingly, the crystallinity and graphitization degree of the carbon materials obtained in NaF, KF and NaCl are found to be considerably greater than those obtained in ZnCl 2 , MgCl 2 and KCl. The possible mechanism involved in the conversion of PET into carbon nanostructures in the molten salt environment is discussed. The results obtained provide insights into molten salt conversion of PET into carbon materials with different properties for various applications.
研究领域:
材料科学
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环境科学
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纳米技术
·
化学工程
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Yueyue He,Huaigang Cheng,Zihe Pan,Xiangping Zhang
Heterogeneous catalysts can avoid the problem of difficult separation and recovery of homogeneous catalysts in transesterification reactions, but there is a lack of basis for process optimization because the quantitative influence mechanism of supports is not clear. In this work, we firstly attempt to make a comprehensive comparation on the effect of potassium fluoride (KF) catalysts on various supports (carbonates and oxides of cerium, magnesium and calcium) on the transesterification reaction, especially on the kinetics. According to the results, oxide-supported catalysts are significantly more active than carbonate-supported catalysts because they have more active sites. When oxides were used as supports, KF/MgO exhibited good activity because of its stronger basicity and higher number of active sites on the surface. Under the same process conditions, the stability time of KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction was 240 min, 90 min and 30 min, respectively. KF/MgO achieved a conversion of 68.0 %. The activation energies of the KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction were 22.22 kJ/mol, 15.93 kJ/mol and 15.80 kJ/mol, respectively. The surface alkalinity of KF/MgO increased the frequency of molecular collisions of the reactants and exhibited a faster reaction rate.
研究领域:
催化化学
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材料科学
·
反应工程学
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高影响因子
Journal of Chemistry
·
2020
·
IF 1.79
Zhaozhuo Yu,Weibo Wu,Hu Li,Song Yang
Hydrogenation of bio-based furfural (FUR) to furfuryl alcohol (FFA) is tremendously expanding the application of biomass in many industries such as resins, biofuels, and pharmaceuticals. However, mass manufacture of FFA from FUR is restrained by strict requirements of reaction conditions and expensive catalysts. In this work, an economical and benign catalytic system, containing an easily prepared and reusable catalyst 5 wt.% KF/ZrO2 and a low-cost hydrogen source polymethylhydrosiloxane (PMHS), was developed to be efficient for the hydrogenation of FUR to high-value FFA under mild conditions. The catalyst reactivity was found to be remarkably influenced by the support acid-base properties and KF loading doge. In the presence of 5 wt.% KF/ZrO2, a high FFA yield of 97% and FUR conversion of 99% could be obtained at 25°C in just 0.5 h, which was superior to those attained with other tested catalysts. The KF/ZrO2 catalyst could be recycled at least five times, with the FFA yield slightly decreasing from 97% to 71%. The spare decrease in FFA yield is possibly attributed to the catalyst pore blocking, as clarified by SEM, BET, XPS, and ICP-MS measurements of the fresh and reused catalysts.
研究领域:
化学工程
·
可再生资源利用
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高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2024
·
IF 3.2
Taiyu Duan,Yao Ji,Weichao Wang,Qinyuan Zhang
The 1.0 μm ultra-short pulse laser is distinguished by its high energy, short pulse width, and intense peak power density, serving various applications in materials processing and biomedicine. Yb ions play a crucial role in this wavelength range, yet achieving high doping levels in commercial Yb-doped silica fibers is challenging due to their dense network structure. Here, we present the design and fabrication of a fluorophosphate (FP) glass with high thermal shock stability (figure of merit is 0.95), achieved through thermodynamic prediction methods, ion field strength analysis, and glass structure theory. By modifying the composition of high-field-strength cations, we not only alter the fundamental properties of the glass but also enhance its thermomechanical performance. Specifically, Yb 3+ -doped Zn(PO 3 ) 2 -Ba(PO 3 ) 2 -AlF 3 -KF FP glass (Yb 10 -ZBAFP10) exhibits a high emission cross-section (0.74×10 −20 cm 2 at ∼1008 nm), a low level of minimum population inversion ( β min =0.09), and minimum pump intensity ( I min =1.75 kW/cm 2 ). Furthermore, it demonstrates a stable fluorescence lifetime within the temperature range of 298 ∼ 473 K. These findings highlight the potential of Yb 3+ -doped FP glass for applications demanding high thermal shock stability, particularly in high repetition rate ultra-short pulse laser systems.
研究领域:
光子学
·
材料科学
·
激光技术
·
玻璃物理
·
光学材料
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DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Liyu Chen,Jiaxin Yang,Yifan Zhang,Shaohua Wu,Youjian Yang,Wenju Tao,Zhaowen Wang
The synthesis of an Al–Zr master alloy in KF–AlF 3 –ZrO 2 molten salt by combining aluminothermic reduction and molten salt electrolysis processes was studied. The effects of reduction parameters such as stirring, reaction time, Al/ZrO 2 mass ratio and temperature on the Zr content and Zr recovery rate were studied and optimized. Under the optimal conditions of stirring, reaction time of 4 h, Al/ZrO 2 mass ratio of 3 and temperature of 960 °C, an Al–Zr master alloy can be obtained with a Zr content of 6.78 wt% and Zr recovery rate of 29.85%. The characterization results of the alloy show that the main phases contain Al and Al 3 Zr. And the Al 3 Zr appears as long rod-shaped or tetragonal shapes, which influenced by the Zr content and cooling rate. In addition, the reduced molten salt is electrolyzed to further extract Zr from the molten salt. The results show that the Zr remaining in the molten salt is completely recovered with a Zr recovery rate up to 94.72%. This two-step process is feasible for the large-scale extraction of Zr in molten salts to produce Al–Zr master alloys.
研究领域:
冶金工程
·
材料科学
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高影响因子
BIOORGANIC CHEMISTRY
·
2022
·
IF 5.307
Junjie Wu,Mengmeng Zhang,Lulu Song,Yahong Tan,Yosuke Taniguchi,Christopher John Hipolito,Youming Zhang,Yizhen Yin
Oxidative lesions, such as 8-oxo-dG and 8-oxo-dA, are continuously generated from exposure to reactive oxygen species. While 8-oxo-dG has been extensively studied, 8-oxo-dA has not received as much attention until recently. Herein, we report the synthesis of duplex DNAs incorporating dA, 8-oxo-dA, 7-deaza-dA, 8-Br-dA, and 8-Br-7-deaza-dA, which have different substitutions at 7- and 8-position, for the investigation into the implications of N7-hydrogen and C8-keto on the base pairing preference, mutagenic potential and repair of 8-oxo-dA. Base pairing study suggested that the polar N7-hydrogen and C8-keto of 8-oxo-dA, rather than the syn -preference, might be essential for 8-oxo-dA to form a stable base pair with dG. Insertion and extension studies using KF-exo − and human DNA polymerase β indicated that the efficient dGTP insertion opposite 8-oxo-dA and extension past 8-oxo-dA:dG are contingent upon not only the stable base pair with dG, but also the flexibility of the active site in polymerase. The N7-hydrogen in 8-oxo-dA or C7-hydrogen in 7-deaza-dA and 8-Br-7-deaza-dA was suggested to be important for the recognition by hOGG1, although the excision efficiencies of 7-deaza-dA and 8-Br-7-deaza-dA were much lower than 8-oxo-dA. This study provides an insight into the structure-function relationship of 8-oxo-dA by nucleotide analogues.
研究领域:
分子生物学
·
生物化学
·
遗传学
·
DNA修复
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xuanchun Wu,Guannan Zhou,Wenguan Liu,Yong Cao,Huiqin Yin,Zhongfeng Tang
Developing molten salt electrolytes with a low melting point and high electrical conductivity is critical for advanced thermal batteries. A novel LiCl-LiBr-KBr-KF (15.0-55.0-25.0-5.0 mol%) molten salt electrolyte was designed and validated through phase diagram calculation and experimental measurements. Compared with the LiCl-LiBr-KBr system, the melting point of the LiCl-LiBr-KBr-KF system decreased by 8.0 °C, the electrical conductivity increased by 0.25 S/cm, and the electrochemical window widened by 0.1 V at 500.0 °C. The mass loss of LiCl-LiBr-KBr-KF electrolytes at 830.0 °C is only 3.0 wt%, and its density at 500.0 °C is 2.36 g/cm 3 , i.e., 0.07 g/cm 3 higher than that of LiCl-LiBr-KBr. Practically, its lower melting point can reduce the activation energy of thermal batteries. Meanwhile, enhanced electrical conductivity and Li + diffusion coefficient can improve the power density and response speed of the thermal battery. LiCl-LiBr-KBr-KF electrolyte exhibits superior comprehensive performance. This result not only enriches the high-performance molten salt materials but also provides a novel strategy for designing next-generation thermal battery electrolytes.
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高影响因子
Journal of Physical Chemistry C
·
2013
·
IF 4.814
Yongfeng Liu,Chao Li,Bo Li,Mingxia Gao,Hongge Pan
The hydrogen storage properties and mechanisms of the Mg(NH2)2–2LiH system with potassium halides (KF, KCl, KBr, and KI) were investigated and discussed. The results show that the KF-added sample exhibits superior hydrogen storage properties as ∼5.0 wt % of hydrogen can be reversibly stored in the 0.08KF-added sample via a two-stage reaction with an onset dehydrogenation temperature of 80 °C. However, hydrogen storage behaviors of the samples with KCl, KBr, and KI remain almost unchanged. The fact that KF can readily react with LiH to convert to KH and LiF due to the favorable thermodynamics during ball milling should be the primary reason for its significant effects, as the presence of KH provides a synergetic thermodynamic and kinetic destabilization in the hydrogen storage reaction of the Mg(NH2)2–2LiH system by declining the activation energy of the first-step dehydrogenation as a catalyst and reducing the desorption enthalpy change of the second step as a reactant. The understanding on the role played by KF sheds light on how to further decrease the operating temperature and enhance the hydrogen storage kinetics of the metal–N–H system.
研究领域:
材料科学
·
化学工程
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高影响因子
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