Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 124
·期 2
·683-699
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IF 1.515
Zhu Min,Chen Changlin
A series of Pt–yLi 2 B 4 O 7 /WO x /ZrO 2 (y = 0, 0.5, 1, 2 wt%) catalysts were prepared by varying the content of Li 2 B 4 O 7 through the method of coimpregnation-calcination. The obtained catalysts were used for the selective hydrogenolysis of glycerol to 1,3-propanediol. Meanwhile, these catalysts were characterized by N 2 adsorption and desorption (BET), CO chemisorption, X-ray diffraction (XRD), NH 3 -temperature programmed desorption (NH 3 -TPD), H 2 -temperature programmed reduction (H 2 -TPR), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The results showed that Pt–1Li 2 B 4 O 7 /WO x /ZrO 2 achieved the highest activity with glycerol conversion of 90.7% at 150 °C and 4 MPa and exhibited excellent stability over 200 h. Pt/WO x /ZrO 2 catalyst modified with Li 2 B 4 O 7 was able to enhance catalytic activity and stability, since Li 2 B 4 O 7 promoted the dispersion of Pt, increased the acid amount of the catalyst and strengthened the interaction between active components and support.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 30
·16152-16162
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IF 14.511
Xin Dai,Kunyang Zou,Weitao Jing,Peng Xu,Junjie Sun,Shengwu Guo,Qiang Tan,Yongning Liu,Tengfei Zhou,Yuanzhen Chen
The electron-deficient property of the atoms in functional materials endow them with tunable adsorption and catalysis effects on polysulfides, thus improving the performance of lithium–sulfur batteries. In this work, Li2B4O7 nanoparticles, which have abundant electron deficiencies derived from the [BO3] Lewis acid units, were uniformly cladded in the carbon nanofibers (LBO–CNF) and employed as interlayers for Li–S batteries. This functionalized interlayer expressed a high adsorption energy of ∼3.6 eV for polysulfides (e.g., Li2S6 and Li2S4) and effectively suppressed the polysulfides' shuttle behavior, delivering a high reversible capacity of 1242.6 mA h g−1 at 0.2C and good cycling performance with a low fading rate of 0.068% per cycle at 1C, thus effectually inhibiting the phenomenon of self-discharge. Besides, the lithiation reaction kinetics was also effectively enhanced, enhancing the rate performance of the battery to 644 mA h g−1 at 5C. This work provides a new strategy to enhance the electrochemical performance of Li–S batteries by applying the compounds of electronic-deficiency B-species and functionalized carbon.
研究领域:
材料科学
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电化学
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能源存储
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纳米材料
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功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Hongyu Qi,Jiaxin Han,Lin Xing,Jia Xu,Yushan Liu,Xun Wang,Tao Zhang,Yong Ma,Lingzong Meng
The phase equilibrium of the quinary system LiCl–Li2SO4–LiBO2–Li2B4O7–H2O at 323.15 K was studied with an isothermal dissolution method. The dry-salt phase diagram of the quinary system consists of one invariant point saturated with LiCl·H2O, Li2B4O7·3H2O, and LiBO2·2H2O, three univariant curves, and three crystallization regions saturated with Li2SO4·H2O corresponding to LiCl·H2O, Li2B4O7·3H2O, and LiBO2·2H2O. The J(H2O), J(Li2SO4), refractive index, and pH value change gradually with the changing concentration. Combining the equilibrium constants for boron-containing species, the pH values, and concentration of total boron, the boron-containing species distributions in the mixed solution in the system were calculated. The concentrations of B3O3(OH)52– and B5O6(OH)4– are very low and can be neglected. The boron-containing species distributions are mainly affected by m(LiCl) in the solution but less by m(Li2SO4). The results of the phase diagram and boron-containing species distribution in the quinary system can provide fundamental thermodynamic data for the extraction of lithium borate from brines.
研究领域:
物理化学
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化学热力学
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无机化学
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溶液化学
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材料科学
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产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2020
·Vol. 2020
·期 17
·1676-1682
·
IF 2.529
Huimin Song,Naizheng Wang,Yunfei Li,Wang Liu,Zheshuai Lin,Jiyong Yao,Guochun Zhang
Graphical Centimeter-level Li 5 MgSrFeB 12 O 24 single crystals were grown for the first time using Li 2 B 4 O 7 as a self-flux. Transmittance spectra of a Li 5 MgSrFeB 12 O 24 crystal reveal a wide transmittance window covering the range from UV to middle IR, and magnetic measurements show its paramagnetic characteristics. Two ferroborates Li 5 MSrFeB 12 O 24 (M = Mg, Zn) crystallized in trigonal R 3 space group, were obtained by high temperature solid state reaction. Centimeter-level Li 5 MgSrFeB 12 O 24 single crystals were grown from high temperature solution using Li 2 B 4 O 7 as a self-flux. In their structures, [FeO 6 ] octahedra connect with [B 2 O 6 ] chains by corner-sharing O atoms forming the three-dimensional [FeB 12 O 24 ] framework. The family of ferroborates(III) was summarized and the structural comparison with Ba 2 MgB 6 O 12 based on cation cosubstitution was also discussed to better understand the crystal structures of Li 5 MSrFeB 12 O 24 (M = Mg, Zn). The transmittance spectrum of a Li 5 MgSrFeB 12 O 24 crystal was measured to detect its transmittance window. In addition, thermal behaviors, other optical and magnetic characteristics of Li 5 MSrFeB 12 O 24 (M = Mg, Zn) were discussed as well.
研究领域:
材料科学
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晶体学
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光学
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固体化学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2020
·
IF 2.838
Lan Yang,Lele Chen,Tao Zhang,Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubilities and the refractive indices in the ternary system LiBO 2 −Li 2 B 4 O 7 −H 2 O at 298.15 K and 323.15 K were determined with the isothermal dissolution method. The phase diagrams and refractive index diagrams were drawn with the experimental values. The phase diagrams at 298.15 K and 323.15 K consist of one invariant point, two univariant curves and two crystallization regions corresponding to Li 2 B 4 O 7 ·3H 2 O, LiBO 2 ·8H 2 O (at 298.15 K) and LiBO 2 ·2H 2 O (at 323.15 K). Based on the Pitzer model, the mixing ion-interaction parameters ( θ B ( O H ) 4 − , B 4 O 5 ( OH ) 4 2 − and Ψ L i + , B ( O H ) 4 − , B 4 O 5 ( O H ) 4 2 − ) at 298.15 K and 323.15 K were fitted with the solubility data. A comparison shows that the calculated solubilities in the ternary system at 298.15 and 323.15 K agree well with the experimental data. The phase diagram and Pitzer model for the ternary system were then used to conduct isothermal evaporation simulation. Different salt will be obtained if the original solution point in different unsaturated regions.
研究领域:
化学
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材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Tao Zhang,Liwei Zhuang,Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma
The solubilities of salts, refractive indices, and pH values of the equilibrium liquid phases in the quaternary system LiCl–LiBO2–Li2B4O7–H2O at 323.15 K were investigated by the isothermal dissolution method for the first time. The dry-salt diagram of the quaternary system consisted of one invariant point, three univariant curves and three crystallization fields corresponding to LiCl·H2O, LiBO2·2H2O, and Li2B4O7·3H2O. The solution refractive indices and pH values change regularly with the changing of concentration. Combining the equilibrium constants for different boron species, the distributions of six boron species in the mixed solution in the systems LiCl–LiBO2–H2O, LiBO2–Li2B4O7–H2O, and LiCl–Li2B4O7–LiBO2–H2O were calculated with the total boron concentration and pH values. The main boron species in the mixed solution of the quaternary system are B3O3(OH)4–, B4O5(OH)42–, B(OH)3, and B5O6(OH)4–. The boron species distributions are mainly affected by the pH values and the concentration of total boron and LiCl in the solution. The results of phase diagram and boron species distribution in the quaternary system can supply foundation data for separating lithium borate from brines.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
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