JOURNAL OF CHEMICAL THERMODYNAMICS
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2018
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IF 2.631
Jing Miao,Kun-Xian Wu,Zhi-Hong Liu
Two pure mixed alkali-transition metal borates, Li 6 Zn 3 B 4 O 12 (s) and Na 3 ZnB 5 O 10 (s) have been synthesized and characterized by XRD, FT-IR, and chemical analysis. For Li 6 Zn 3 B 4 O 12 , the molar enthalpy of solution of Li 6 Zn 3 B 4 O 12 in the mixture solvent of {2.00 mL of 1 mol·L −1 HCl + H 3 BO 3 )(aq)} was measured. The molar enthalpies of solution of ZnO(s) in 1 mol·L −1 HCl(aq), and LiBO 2 (s) in the mixture solvent of {2.00 mL of 1 mol·L −1 HCl(aq) + ZnO(aq)} were also measured. For Na 3 ZnB 5 O 10 , the molar enthalpy of solution of Na 3 ZnB 5 O 10 in 2.00 mL of 1 mol·L −1 HCl(aq) was measured. The molar enthalpy of solution of NaBO 2 ·4H 2 O(s) in the mixture solvent of {2.00 mL of 1 mol·L −1 HCl(aq) + H 3 BO 3 + ZnO](aq)} was also measured. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol·L −1 HCl(aq), and ZnO(s) in {1 mol·L −1 HCl(aq) + H 3 BO 3 }, together with the use of the standard molar enthalpies of formation for LiBO 2 (s)/NaBO 2 ·4H 2 O(s), ZnO(s), H 3 BO 3 (s) and H 2 O(l), the standard molar enthalpies of formation of −(5867.5 ± 4.8) kJ·mol −1 for Li 6 Zn 3 B 4 O 12 and −(4655.3 ± 6.6) kJ·mol −1 for Na 3 ZnB 5 O 10 at T = 298.15 K were obtained on the basis of two appropriate thermochemical cycles.
研究领域:
物理化学
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无机化学
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热化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2016
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IF 1.207
Changshuai Shen,Wenli Li,Cairong Zhou
The molar heat capacities ( C p ) of guaiacol (CAS 90-50-1) and acetyl guaiacol ester (AGE, CAS 613-70-7) were determinated from 290 K to 350 K by differential scanning calorimetry (DSC), and expressed as a function of temperature. Two kinds of group contribution models were used to estimate the molar heat capacities of both guaiacol and AGE, the average relative deviation is less than 10%. The standard molar enthalpies of combustion of guaiacol and AGE were − 3590.0 kJ·mol − 1 and − 4522.1 kJ·mol − 1 by a precise thermal isolation Oxygen Bomb Calorimeter. The standard molar enthalpies of formation of guaiacol and AGE in a liquid state at 298.15 K were calculated to be − 307.95 kJ·mol − 1 and − 448.72 kJ·mol − 1 , respectively, based on the standard molar enthalpies of combustion. The thermodynamic properties are useful for exploiting the new synthesis method, engineering design and industry production of AGE using guaiacol as a raw material.
研究领域:
物理化学
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热力学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
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IF 2.679
Hui-Hui Zhang,Na Kong,Jie Wang,Zhi-Hong Liu
Two pure microporous copper borates (NaCuB 7 O 12 · H 2 O and KCuB 7 O 12 · H 2 O) have been synthesised and characterized by XRD, FT-IR, TG techniques and chemical analysis. The molar enthalpies of solution of NaCuB 7 O 12 · H 2 O (s) and KCuB 7 O 12 · H 2 O (s) in 1 mol · dm −3 HCl (aq) were determined to be – (24.12 ± 0.12) kJ · mol −1 and – (35.07 ± 0.08) kJ · mol −1 , respectively. The molar enthalpies of solution of 0.72 mg of NaCl (s) and 0.91 mg of KCl in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 HCl (aq) which contains 5.3 mg of H 3 BO 3 were measured, respectively. The molar enthalpies of solution of 2.09 mg of CuCl 2 · 2H 2 O (s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 HCl (aq) which contains 5.3 mg of H 3 BO 3 and 0.72 mg of NaCl/0.91 mg of KCl were also measured, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol · dm −3 HCl (aq), together with the standard molar enthalpies of formation for CuCl 2 · 2H 2 O (s), NaCl (s)/KCl (s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of – (5373.3 ± 5.6) kJ · mol −1 for NaCuB 7 O 12 · H 2 O (s) and – (5375.0 ± 5.6) kJ · mol −1 for KCuB 7 O 12 · H 2 O (s) at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles. It is obvious that KCuB 7 O 12 · H 2 O (s) is more thermal stable than that of NaCuB 7 O 12 · H 2 O (s).
研究领域:
化学热力学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
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IF 2.888
Sa-Ying Li,Pan Liang
Two alkaline-earth metal borates BaZn 2 B 2 O 6 with NLO property and Ba 2 Cd(B 3 O 6 ) 2 with birefringent property have been synthesized and characterized by XRD, FT-IR, and chemical analysis. The molar enthalpies of solution of BaZn 2 B 2 O 6 (s) and Ba 2 Cd(B 3 O 6 ) 2 (s) in 2.00 mL of 1 mol·dm −3 HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of CdCl 2 ·2.5H 2 O(s) and ZnO(s) in the mixture solvent of 2.00 mL of {1 mol·dm –3 HCl + H 3 BO 3 + Ba(OH) 2 ·8H 2 O} (aq) were also measured, respectively. With the incorporation of the previously determined enthalpies of solution of H 3 BO 3 (s) in 2.00 mL of 1 mol· dm –3 HCl (aq), Ba(OH) 2 ·8H 2 O) in the mixture solvent of (2.00 mL of 1 mol·dm −3 HCl + H 3 BO 3 ) (aq), together with the standard molar enthalpies of formation for CdCl 2 ·2.5H 2 O(s)/ZnO(s), Ba(OH) 2 ·8H 2 O(s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of – (2703.0 ± 2.2) kJ·mol −1 for BaZn 2 B 2 O 6 (s) and – (5625.26 ± 5.1) kJ·mol −1 for Ba 2 Cd(B 3 O 6 ) 2 at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
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物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2013
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IF 2.297
Qiu-Yue Kang,Qing Song,Sa-Ying Li,Zhi-Hong Liu
Two pure borophosphates microporous materials, K[ZnBP 2 O 8 ] and NH 4 [ZnBP 2 O 8 ], have been synthesized and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of K[ZnBP 2 O 8 ](s) and NH 4 [ZnBP 2 O 8 ](s) in 3 mol · dm −3 HCl(aq), of KCl/NH 4 Cl(s) in (HCl + H 3 BO 3 )(aq), and of Zn(PO 3 ) 2 (s) in (HCl + H 3 BO 3 + KCl/NH 4 Cl)(aq) were measured by microcalorimeter at T = 298.15 K, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 3 mol · dm −3 HCl(aq), together with the use of the standard molar enthalpies of formation for Zn(PO 3 ) 2 (s), KCl(s), NH 4 Cl(s), H 3 BO 3 (s) and H 2 O(l), the standard molar enthalpies of formation of −(3184.0 ± 1.2) kJ · mol −1 for K[ZnBP 2 O 8 ] and −(3067.6 ± 1.2) kJ · mol −1 for NH 4 [ZnBP 2 O 8 ] at T = 298.15 K was obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
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物理化学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
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IF 3.178
Qi-Chao Yang,Dong-Fang Qiu,Yuan-Lin Dang,Zhan-Ping Qiao,Zhi-wei Xu
Two equilibrium diagrams of the ternary system (CsX + MnX 2 + H 2 O, X = Cl, Br) at 298.15 K are reported in this paper. Each system has two double salts (CsMnX 3 ·2H 2 O and Cs 2 MnX 4 ·2H 2 O X = Cl, Br) in it and the elements of all double salts in phase diagrams are confirmed by Schreinemaker method. Equilibrium phase diagrams show that the chloride double salts are congruently soluble compounds in water, however that the bromide double salts are incongruently soluble compounds in water. All the double salts are characterized by titrimetric analysis, powder X-ray diffraction, thermogravimetric and differential thermalanalysis. The enthalpies of formation of these double salts are first calculated by measuring their enthalpies of dissolution.
研究领域:
物理化学
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无机化学
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热力学
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产品关联
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2024
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IF 2.2
Yufeng Tang,Qichao Yang,Zhanping Qiao
The phase equilibrium of ternary systems RbX/CsX + CuX 2 + H 2 O (X = Cl, Br) at T = 298.15 K were investigated by the isothermal dissolution equilibrium method, in which the composition of equilibrium solid phases was determined by the Schreinemaker’s wet residue method. In the system RbCl + CuCl 2 + H 2 O, there were three crystallization regions corresponding to RbCl, Rb 2 CuCl 4 ·2H 2 O and CuCl 2 ·2H 2 O, respectively. Five crystallization fields corresponding to CsCl, CsCuCl 3 , Cs 3 Cu 2 Cl 7 ·2H 2 O, Cs 2 CuCl 4 and CuCl 2 ·2H 2 O were formed in the system CsCl + CuCl 2 + H 2 O. The ternary system RbBr + CuBr 2 + H 2 O had three crystalline regions corresponding to RbBr, Rb 2 CuBr 4 ·2H 2 O and CuBr 2 . In the system CsBr + CuBr 2 + H 2 O, the solid-phases of CsCuBr 3 , Cs 2 CuBr 4 , besides CsBr and CuBr 2 , were discovered. The results were compared with available literature data for cesium bromide/copper bromide salt-water system. The seven new solid phase were characterized using the X-ray diffraction method and thermogravimetric/differential analysis. The dissolution enthalpies of Rb 2 CuCl 4 ·2H 2 O, Rb 2 CuBr 4 ·2H 2 O, CsCuCl 3 , Cs 3 Cu 2 Cl 7 ·2H 2 O, Cs 2 CuCl 4 , CsCuBr 3 and Cs 2 CuBr 4 at T = 298.15 K were measured. Their standard enthalpies of formation were obtained, and the results were in order with −(1714.4 ± 3.2) kJ·mol −1 , −(1533.6 ± 3.3) kJ·mol −1 , −(697.8 ± 3.1) kJ·mol −1 , −(2418.9 ± 6.1) kJ·mol −1 , −(1134.8 ± 3.2) kJ·mol −1 , −(563.5 ± 3.2) kJ·mol −1 and −(966.2 ± 3.3) kJ·mol −1 , respectively.
研究领域:
物理化学
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无机化学
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热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2018
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IF 2.631
Kun-Xian Wu,Xiao-Jun Zhao,Zhi-Hong Liu
Two alkali-alkaline earth metal borates with NLO properties for NaCaBO 3 and Li 4 CaB 2 O 6 have been synthesized and characterized by XRD, FT-IR, and chemical analysis. The molar enthalpies of solution of NaCaBO 3 (s) and Li 4 CaB 2 O 6 (s) in 2.00 cm 3 of 1 mol·dm −3 HCl (aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of CaCl 2 ·2H 2 O(s) in the mixture solvent of 2.00 cm 3 of (1 mol·dm −3 HCl + H 3 BO 3 + NaCl) (aq), and {2.00 cm 3 of 1 mol·dm −3 HCl + H 3 BO 3 + LiCl·H 2 O} (aq) were also measured, respectively. With the incorporation of the previously determined enthalpies of solution of H 3 BO 3 (s) in 2.00 cm 3 of 1 mol·dm −3 HCl (aq), NaCl (s) in the mixture solvent of (2.00 cm 3 of 1 mol·dm −3 HCl + H 3 BO 3 ) (aq) and LiCl·H 2 O(s) in the mixture solvent of {2.00 cm 3 of 1 mol·dm −3 HCl + H 3 BO 3 } (aq), together with the standard molar enthalpies of formation for CaCl 2 ·2H 2 O (s), NaCl(s)/LiCl·H 2 O (s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of – (1664.5 ± 0.9) kJ·mol −1 for NaCaBO 3 (s) and – (3391.7 ± 1.9) kJ·mol −1 for Li 4 CaB 2 O 6 (s) at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles .
研究领域:
无机化学
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材料科学
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物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
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IF 2.888
Zhan-Ping Qiao,Tian Yang,Shu-Zhi Cao,Yu-Feng Tang,Qi-Chao Yang
Solid-liquid equilibria in the ternary systems RbX + CdX 2 + H 2 O (X = Cl, Br) at T = 298.15 K and under 101.3 kPa were investigated by the method of isothermal solution saturation, and the corresponding phase diagrams were constructed. It was found that there were five crystallization regions corresponding to CdCl 2 ·2.5H 2 O, RbCd 2 Cl 5 ·H 2 O, RbCdCl 3 , Rb 4 CdCl 6 and RbCl in the system (RbCl + CdCl 2 + H 2 O). Four crystallization regions corresponding to CdBr 2 ·4H 2 O, RbCdBr 3 , Rb 4 CdBr 6 and RbBr were found in the system (RbBr + CdBr 2 + H 2 O). The new solid compounds RbCdCl 3 , RbCdBr 3 and Rb 4 CdBr 6 were congruently soluble in water, and new double salts RbCd 2 Cl 5 ·H 2 O and Rb 4 CdCl 6 were incongruently soluble in water. The new solid-phase compounds RbCd 2 Cl 5 ·H 2 O, RbCdCl 3 , Rb 4 CdCl 6 , RbCdBr 3 and Rb 4 CdBr 6 were characterized by chemical analysis, XRD and TG-DTG techniques. The standard molar enthalpies of solution of RbCd 2 Cl 5 ·H 2 O, RbCdCl 3 , Rb 4 CdCl 6 , RbCdBr 3 and Rb 4 CdBr 6 in water were measured to be (20.74 ± 0.16) kJ·mol −1 , (28.00 ± 0.39) kJ·mol −1 , (96.56 ± 0.50) kJ·mol −1 , (35.38 ± 0.33) kJ·mol −1 and (110.64 ± 0.62) kJ·mol −1 by microcalorimetry in the condition of infinite dilution, and their standard molar enthalpies of formation were determined to be −(1545.3 ± 0.6) kJ·mol −1 , −(856.5 ± 0.7) kJ·mol −1 , −(2180.1 ± 1.3) kJ·mol −1 , −(727.1 ± 0.7) kJ·mol −1 and −(1920.5 ± 1.3) kJ·mol −1 , respectively.
研究领域:
物理化学
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热力学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
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IF 2.679
Qi Yang,Xiaxia Song,Jing Ge,Guowei Zhao,Wendou Zhang,Gang Xie,Sanping Chen,Shengli Gao
A new energetic MOFs , {[Ni 2 (C 2 H 5 N 5 ) 2 (C 3 H 2 O 4 ) 2 (H 2 O)]·3H 2 O} n (Hdatrz (C 2 H 5 N 5 ) = 3,5-diamino-1,2,4-triazole, H 2 mal (C 3 H 4 O 4 ) = malonic acid), has been synthesized and characterized by element analysis, chemical analysis, IR spectroscopy, single-crystal X-ray diffraction and thermal analysis. X-ray diffraction analysis confirmed that the compound featured a 2D layer structure with dinuclear Ni(II) unit. Thermal analysis demonstrated that the compound after dehydration have good thermostability with decomposition temperature up to 633 K. The non-isothermal kinetics for the compound was studied by Kissinger’s and Ozawa’s methods. The Arrhenius equation of initial thermal decomposition process of compound can be expressed as ln k = 55.89 − 332.01 × 10 3 / RT . Furthermore, a reasonable thermochemical cycle was designed based on the preparation reaction of the compound, and standard molar enthalpy of dissolution of reactants and products were measured by RD496-2000 calorimeter. Finally, the standard molar enthalpy of formation of the compound was determined to be −(2766.3 ± 2.3) kJ · mol −1 in accordance with Hess’s law. In addition, the specific heat capacity of the compound at T = 298.15 K was determined to be 1.42 ± 0.11 J · K −1 · g −1 by RD496-2000 calorimeter.
研究领域:
材料科学
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化学
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热力学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2025
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IF 2.1
Dong-qin Bi,Shu-han Li,Xue-jia Zhang,Zi-xiao Zhao,Qi-chao Yang,Zhan-ping Qiao
Two-phase equilibrium of ternary systems of CdBr2–l-proline/(4-OH-l-proline)–H2O at T = 298.15 K is studied. Their isothermal solution equilibrium phase diagrams have been drawn based on the solubility data. Two double salts (Cd(C5H9NO2)Br2·H2O and Cd(C5H9NO3)Br2) have been found by the Schrienemakers method in phase diagrams, and they are all congruently soluble in water. Both of them have been synthesized and characterized by powder XRD and TG-DTG. For the first time, enthalpies of solution of Cd(C5H9NO2)Br2·H2O and Cd(C5H9NO3)Br2 are measured in water, and their standard molar enthalpies of formation at 298.15 K are calculated by designing thermochemical cycles according to the Hess law. By comparison, it is found that the region of infinite dissolution appears in the ternary system of CdBr2–l-proline–H2O at 298.15 K. If the composition of the solution is in this region, there is no crystal when the water evaporates and only a viscous mixture can be obtained.
研究领域:
物理化学
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无机化学
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热力学
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材料科学
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晶体学
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高影响因子
危险品化学品经营许可证（带存储）