JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Yong-Jie Geng,Jie Wang,Zhi-Hong Liu
Two transition metal borates with microporous structures for Na 2 Co 2 B 12 O 21 and Na 2 Cu 2 B 12 O 21 have been synthesized and characterized by XRD, FT-IR, and elemental analysis. The molar enthalpies of solution of Na 2 Co 2 B 12 O 21 (s) and Na 2 Cu 2 B 12 O 21 (s) in 1 mol dm −3 HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of CoCl 2 ·6H 2 O(s) and CuCl 2 ·2H 2 O(s) in the mixture solvent of 2.00 cm 3 of 1 mol dm −3 HCl(aq) in which 5.30 mg of H 3 BO 3 and 0.84 mg of NaCl being added 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 CoCl 2 ·6H 2 O(s)/CuCl 2 ·2H 2 O(s), NaCl(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of – (9072.4 ± 9.7) kJ mol −1 for Na 2 Co 2 B 12 O 21 (s) and – (8887.5 ± 9.7) kJ mol −1 for Na 2 Cu 2 B 12 O 21 (s) at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles. It is obvious that Na 2 Co 2 B 12 O 21 (s) is more thermal stable than that of Na 2 Cu 2 B 12 O 21 (s).
研究领域:
材料科学
·
热化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Pan Liang,Sa-Ying Li
The s tandard mole enthalpy of formation is an essential feature of chemical compounds, which is critical for assessing the thermal effects of chemical reactions with their participation. In this paper, two pure phases of zinc borates, 2ZnO·2B 2 O 3 ·3H 2 O and ZnB 4 O 7 , have been synthesized by hydrothermal and boric acid flux methods, respectively. They were characterized by XRD, FT-IR and TGA. The molar enthalpies of solution of 2ZnO·2B 2 O 3 ·3H 2 O (s) and ZnB 4 O 7 (s) in 1 mol·dm −3 HCl (aq) were measured at T = 298.15 K, respectively, by the use of an isothermal microcalorimeter. In accordance with Hess’ law, the standard molar enthalpies of formation of the two zinc borates 2ZnO·2B 2 O 3 ·3H 2 O (s) and ZnB 4 O 7 (s) were calculated to be −(4177.02 ± 3.3) kJ·mol −1 and −(2971.1 ± 3.3) kJ·mol −1 , respectively, by the use of standard molar enthalpies of formation for ZnO (s), H 3 BO 3 (s) and H 2 O (l) based on the two designed thermochemical cycles.
研究领域:
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
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
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Jie Wang,Ai-Qing Zhang,Zhi-Hong Liu
Two pure zinc borates with microporous structure 3ZnO·3B 2 O 3 ·3.5H 2 O and 6ZnO·5B 2 O 3 ·3H 2 O have been synthesized and characterized by XRD, FT-IR, TG techniques and chemical analysis. The molar enthalpies of solution of 3ZnO·3B 2 O 3 ·3.5H 2 O(s) and 6ZnO·5B 2 O 3 ·3H 2 O(s) in 1 mol · dm −3 HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of ZnO(s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 HCl(aq) in which 5.30 mg of H 3 BO 3 were added were also measured. 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 use of the standard molar enthalpies of formation for ZnO(s), H 3 BO 3 (s), and H 2 O(l), the standard molar enthalpies of formation of −(6115.3 ± 5.0) kJ · mol −1 for 3ZnO·3B 2 O 3 ·3.5H 2 O and −(9606.6 ± 8.5) kJ · mol −1 for 6ZnO·5B 2 O 3 ·3H 2 O at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles .
研究领域:
化学热力学
·
材料科学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2013
·
IF 1.989
Ning Li,Rui-Bin Zhang,Zhi-Hong Liu
Two pure mixed alkali/alkaline earth metal borates with three-dimensional framework, LiBaB 9 O 15 and NaBaB 9 O 15 , have been synthesized by high-temperature solid state reaction, and characterized by XRD, FT-IR, DTA–TG techniques and chemical analysis. The molar enthalpies of solution of LiBaB 9 O 15 and NaBaB 9 O 15 in 1 mol L −1 HCl(aq), and of LiCl·H 2 O(s)/NaCl(s) in [1 mol L −1 HCl + H 3 BO 3 + Ba(OH) 2 ·8H 2 O](aq) have been determined by microcalorimeter at 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol L −1 HCl (aq), together with the use of the standard molar enthalpies of formation for Ba(OH) 2 ·8H 2 O(s), LiCl·H 2 O(s)/NaCl(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of −(6796.8 ± 7.3) kJ mol −1 for LiBaB 9 O 15 and −(6829.9 ± 7.3) kJ mol −1 for NaBaB 9 O 15 were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2019
·
IF 2.251
Fei Yuan,Long Li,Yafei Guo,Tianlong Deng
The dilution enthalpies of LiBO 2 (aq) from 0.0398 to 0.7684 mol·kg −1 and LiB 5 O 8 (aq) from 0.0521 to 0.8067 mol·kg −1 at 298.15 K and 101.325 kPa were investigated using the microcalorimeter BT 2.15. The apparent molar enthalpies on two lithium borates were obtained, and the diagrams of their apparent molar enthalpy against molality for LiBO 2 (aq) and LiB 5 O 8 (aq) were also plotted. Considering the constructers of BO 2 - and B 5 O 8 - in aqueous solution are existed as in [B(OH) 4 ]- and [B 5 O 6 (OH) 4 ]-, the Pitzer single-salt parameters ( β M X ( 0 ) L , β M X ( 1 ) L , β M X ( 2 ) L , C M X L ) for LiB(OH) 4 and LiB 5 O 6 (OH) 4 were obtained for the first time. A comparison between the calculated apparent molar enthalpies for LiBO 2 (aq) and LiB 5 O 8 (aq) based on Pitzer model and those determined experimentally agree well, which indicate that the Pitzer single parameters of LiB(OH) 4 and LiB 5 O 6 (OH) 4 obtained are reliable.
研究领域:
物理化学
·
热化学
·
溶液化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Jun-Feng Wang,Xiao-Lan Wang
Two mixed alkali-alkaline earth metal borates of NaSrBO 3 and KSr 4 B 3 O 9 have been synthesized by high-temperature solid state reaction, which were further characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of NaSrBO 3 (s) and KSr 4 B 3 O 9 (s) in 2.00 cm 3 of 1 mol · dm −3 HCl(aq), at T = 298.15 K were measured to be −(206.84 ± 0.43) kJ · mol −1 and −(494.59 ± 0.53) kJ · mol −1 , respectively. The molar enthalpy of solution of NaCl(s) in 2.00 cm 3 of {1 mol · dm −3 HCl + H 3 BO 3 + Sr(OH) 2 · 8H 2 O}(aq) mixed solvent at T = 298.15 K was measured to be (5.17 ± 0.02) kJ · mol −1 . From these data and with the incorporation of the previously determined enthalpies of solution of H 3 BO 3 (s) in HCl(aq) of Sr(OH) 2 · 8H 2 O(s) in (HCl + H 3 BO 3 )(aq), and of KCl(s) in {HCl + H 3 BO 3 + Sr(OH) 2 · 8H 2 O}(aq), together with the use of the molar enthalpies of formation for NaCl(s)/KCl(s), Sr(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 NaSrBO 3 (s) and KSr 4 B 3 O 9 were calculated to be −(1653.1 ± 1.4) kJ · mol −1 and −(5071.1 ± 3.4) kJ · mol −1 on the basis of the designed thermochemical cycles, respectively.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）