JOURNAL OF CHEMICAL THERMODYNAMICS
·
2018
·
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
·
无机化学
·
热化学
✓ 已验证
DOI
高影响因子
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
APPLIED ENERGY
·
2022
·
IF 11.446
Boshu Jiang,Bachirou Guene Lougou,Hao Zhang,Boxi Geng,Lianxuan Wu,Yong Shuai
The solar-driven thermochemical CO 2 -to-CO conversion is an effective way to achieve the mission of carbon peaking and carbon neutrality. However, synthesizing porous reacting materials with excellent thermal stability, hardness and long-term cyclic stability, oxygen exchange capacity, and higher CO 2 -to-CO conversion are the most important challenges associated with the thermochemical CO 2 -splitting approach and technological upscaling to large-scale applications. This study presented the development of NiFe 2 O 4 oxygen carriers, the synthesis method of SiC and Si 3 N 4 supports, and solar-to-fuel processing of the newly prepared materials through CO 2 -splitting under a highly concentrated solar radiative heat flux. The newly synthesized NiFe 2 O 4 @SiC porous redox material resulted in higher solar energy absorption and CO 2 conversion capability with an instantaneous CO production of 410 μmol/g and direct CO 2 -to-CO conversion rate of 18.1 % at 1073–1273 K reaction temperature. The media composite of NiFe 2 O 4 @SiC exhibited high-temperature thermal changes, good thermochemical reaction stability, and a higher CO production rate through six redox cycles compared to NiFe 2 O 4 @Si 3 N 4 porous reacting material. The high oxidation potential and remarkably solar radiative heat flux absorption and thermochemical CO 2 -splitting capacities of the newly developed materials were demonstrated through experimental analysis. The synergistic effect of the oxygen carriers (NiFe 2 O 4 ) and substrate materials including SiC and Si 3 N 4 skeletons for CO 2 -splitting is highlighted. This study provided comprehensive and novel experimental insights that can be used as guidance for theoretical research and application in CO 2 conversion into high-value-added energy products.
研究领域:
材料科学
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可再生能源
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Jun-Feng Wang,Pan Liang
A pure barium borate of BaB 8 O 11 (OH) 4 ·3H 2 O has been synthesized and characterized by XRD, FT-IR, TGA, and chemical analysis. The molar enthalpies of solution of BaB 8 O 11 (OH) 4 ·3H 2 O in 1 mol dm −3 HCl(aq), and Ba(OH) 2 ·8H 2 O in the mixture solvent of {2.00 cm 3 of 1 mol·dm −3 HCl + H 3 BO 3 (aq)} were measured by microcalorimeter at T = 298.15 K, respectively. With the use of previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol·dm −3 HCl(aq), and the standard molar enthalpies of formation for Ba(OH) 2 ·8H 2 O(s), H 3 BO 3 (s), and H 2 O(l), the standard molar enthalpy of formation of −(7500.6 ± 6.5) kJ·mol −1 at T = 298.15 K was obtained based on an appropriate thermochemical cycle. Moreover, the molar enthalpy of formation of −6091.7 kJ mol −1 for [B 8 O 11 (OH) 4 ] 2− was estimated by a group contribution method, which was used to predict the Δ f H m o of a series of alkaline-earth metal borates for MB 8 O 11 (OH) 4 (M = Ca, Sr, Ba).
研究领域:
物理化学
·
无机化学
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热化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Pan Liang,Qiu-Yue Kang,Lu Du,Zhi-Hong Liu
Two pure microporous materials, Rb[ZnBP 2 O 8 ] and Cs[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 Rb[ZnBP 2 O 8 ] and Cs[ZnBP 2 O 8 ] (s) in 3 mol · dm −3 HCl (aq), of Zn(PO 3 ) 2 (s) in (HCl + H 3 BO 3 ) (aq), and of RbCl (s)/CsCl (s) in [Zn(PO 3 ) 2 + HCl + H 3 BO 3 ] (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), RbCl (s)/CsCl (s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of −(3198.5 ± 1.2) kJ · mol −1 for Rb[ZnBP 2 O 8 ] and −(3212.7 ± 1.2) kJ · mol −1 for Cs[ZnBP 2 O 8 ] at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycle. In addition, the molar enthalpy of formation of −(2944.4 ± 1.2) kJ · mol −1 for [ZnBP 2 O 8 ] − has also been estimated by a group contribution method, which can be used to predict the Δ f H m θ of the other similar borophosphates. Moreover, these data have been further used to compare the thermodynamic stability of this series of borophosphates.
研究领域:
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 THERMODYNAMICS
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2012
·
IF 2.422
Yang Lv,Ning Li,Mei Tang,Zhi-Hong Liu
Two pure hydrated aluminoborates with microporous structure, K 2 [Al(B 5 O 10 )] · 4H 2 O and (NH 4 ) 2 [Al(B 5 O 10 )] · 4H 2 O, have been synthesized and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of K 2 [Al(B 5 O 10 )] · 4H 2 O (s) and (NH 4 ) 2 [Al(B 5 O 10 )] · 4H 2 O (s) in 1 mol · dm −3 HCl (aq) were measured to be −(88.65 ± 0.25) kJ · mol −1 and −(93.37 ± 0.25) kJ · mol −1 , respectively. The molar enthalpies of solution of AlCl 3 ·6H 2 O (s) in (HCl + H 3 BO 3 + KCl) (aq) and in (HCl + H 3 BO 3 + NH 4 Cl) (aq) were 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 use of the standard molar enthalpies of formation for AlCl 3 ·6H 2 O (s), KCl (s)/NH 4 Cl (s), H 3 BO 3 (s), HCl (aq), and H 2 O (l), the standard molar enthalpy of formation of −(6029.8 ± 4.1) kJ · mol −1 for K 2 [Al(B 5 O 10 )] · 4H 2 O (s) and −(5775.0 ± 4.1) kJ · mol −1 for (NH 4 ) 2 [Al(B 5 O 10 )] · 4H 2 O (s) at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles. Moreover, Δ f H m o ([Al(B 5 O 10 )] 2− ) of −4355.3 kJ · mol −1 has also been estimated by a group contribution method, which can be used to predict the standard molar enthalpies of formation of other aluminoborates containing [Al(B 5 O 10 )] 2− anionic framework.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Energies
·
2024
·Vol. 17
·期 9
·2180
·
IF 3
Xicheng Wang,Wentao Xia,Wenlong Xu,Zengqiao Chen,Xiaohan Ren,Yuandong Yang
Thermochemical energy storage (TCES) is one of the key technologies facilitating the integration of renewable energy sources and mitigating the climate crisis. Recently, Li4SiO4has been reported to be a promising heat carrier material for TCES applications, owing to its moderate operation temperature and stability. During the synthetic processes, the properties of the Si source used directly influence the performance of derived Li4SiO4materials; however, the internal relations and effects are not yet clear. Hence, in this work, six kinds of SiO2sources with different phases, morphology, particle size, and surface area were selected to synthesize a Li4SiO4-based TCES heat carrier. The physicochemical properties of the SiO2and the corresponding derived Li4SiO4were characterized, and the comprehensive performance (e.g., heat storage/releasing capacity, rate, and cyclic stability) of the Li4SiO4samples was systematically tested. It was found that the silica microspheres (SPs), which possess an amorphous phase, uniform micro-scale structure, and small particle size, could generate Li4SiO4TCES materials with a highest initial capacity of 777.7 kJ/kg at 720 °C/900 °C under pure CO2. As a result, the SP-L showed an excellent cumulative heat storage amount of 5.84 MJ/kg within 10 heat-releasing/storage cycles, which was nearly 1.5 times greater than the value of Li4SiO4derived from commonly used silicon dioxide. Furthermore, the effects of the utilized Si source on the performance of as-prepared Li4SiO4and corresponding mechanisms were discussed, which offers guidance for the future selection of Si sources to produce high-performance Li4SiO4-based TCES heat carriers.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Zhu-Yu Li,Le-Ran Li,Tong Wu,Qi Niu,Bing Zhang,Ji Liu,Kai Li,Qiang Lu
Calcium-looping-based thermochemical energy storage (TCES) technology can be embraced for peak load shifting in renewable energy generation systems. However, the energy storage properties of Ca-based materials rapidly decay after multiple cycles. In this study, a synergistic strategy involving pyroligneous acid impregnation and Mn–Co–Al incorporation was developed to improve the pore structure, enhance the oxygen vacancy concentration, and boost antisintering performance of the calcium-based composites, thereby significantly improving their TCES properties and cyclic durability. The modified CaO-based composites were systematically analyzed using various characterization methods to evaluate their heat storage performance, sintering resistance mechanism, and physicochemical properties. Characterization results revealed that the codoped sample with Ca:Mn:Co:Al = 100:12:4:5 (PACa-Mn12Co4Al5) possessed a loose and porous surface with a measured specific surface area of 13.72 m2/g, providing channels for CO2 diffusion into the inner particles. Ca3CoMnO6 and Ca3Al2O6, acting as inert supports, were uniformly distributed in PACa-Mn12Co4Al5, effectively mitigating sintering. The addition of Mn–Co–Al strengthened the basicity and promoted oxygen vacancy formation in PACa-Mn12Co4Al5. The oxygen vacancies encouraged the formation of ion diffusion channels, reducing the O2– transport resistance across the surface and within the bulk of PACa-Mn12Co4Al5, thereby improving the reaction activity and conversion efficiency. PACa-Mn12Co4Al5 demonstrated excellent heat storage performance under calcination at 750 °C and carbonation at 850 °C. After 40 and 100 cycles, its energy storage density remained at 97.29% and 84.65% of the initial value (1212.79 kJ/kg), respectively. Moreover, the average radiation absorptance of PACa-Mn12Co4Al5 reached 59.85%, 5.26 times that of limestone-based CaO. Therefore, PACa-Mn12Co4Al5 is a promising heat storage material, providing guidance for the industrial application of Ca-based TCES materials.
研究领域:
储能
·
材料科学
·
化学工程
·
可再生能源
·
热化学
✓ 已验证
产品关联
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
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Feng Long,Xiaolei Zhang,Xincheng Cao,Qiaolong Zhai,Yaoguang Song,Fei Wang,Jianchun Jiang,Junming Xu
Triglycerides are a promising biomass feedstock that can be used for production of organic hydrocarbons including long-chain olefins and paraffin. The challenge for this production process lies on the lack of a clear mechanism of the conversion process. In this work, the conversion mechanism from triglycerides to olefins and paraffin using alkali metal catalysts was investigated adopting both computational calculations using density functional theory and experimental studies. The bond dissociation energies of the main bonds were calculated, especially for the α carbon‑carbon bond, which leads to effective removal of carboxyl groups during the thermochemical conversion process. The dynamic behavior of triglycerides catalyzed by alkali metal catalysts was also investigated using thermogravimetric analysis , which found that Li ion has lowest activation energy below 200 kJ/mol when compared with the other alkali ions studied. The catalytic conversion mechanism was proposed in this work based on the results obtained from TG-IR, GC, GC–MS and XRD analyses. The O atoms are removed in the form of CO, CO 2 and H 2 O, product M + O and M+, which generates M 2 CO 3 . A more detailed mechanism has been proposed in this paper, which has significance toward guiding the cleavage of triglycerides to produce long‑carbon-chain terminal olefins and normal paraffin.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Qibin Zhu,Yimin Xuan,Xianglei Liu
The CaCO 3 /CaO based thermochemical system has great potential in Concentrating Solar Power (CSP) plants. However, the CaCO 3 suffers from high sintering speed, poor thermal conductivity , and weak light absorption, which is not conducive to being directly driven by solar energy. Herein, The Mn and Cr elements were doped into CaCO 3 through the sol-gel method. The synergistic effect between the two elements can maintain the storage density at 1057.3 kJ/kg after 20 cycles at 800 °C. The light absorption under AM 1.5G spectrum was obviously improved to 64.5% and reached 73.3% after 20 cycles. To further improve the thermal conductivity of the composite, the tetrapod-shaped zinc oxide whiskers (TZnO) were directly mixed into the composite. The TZnO acts as the thermal conductance bridge in the composites and can retain its original morphology at high temperatures without reacting with CaCO 3 . When 5% mole ratio of TZnO was added to the Cr/Mn doped CaCO 3 , the thermal conductivity increased by 17.8%. Through the non-isothermal analysis of the reaction kinetics, it is found that the addition of TZnO can effectively accelerate the reaction, especially at a higher heating rate, which is very beneficial to direct solar-driven applications. The optimized composites showed excellent properties in light absorption, sintering resistance, thermal conductivity, and reaction kinetics, which can guide the direct photothermal utilization of CaCO 3 .
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Na Kong,Hui-Hui Zhang,Jie Wang,Zhi-Hong Liu
Two pure dehydrated borogermanates with microporous structure, β -K 2 [B 2 Ge 3 O 10 ] and NH 4 [BGe 3 O 8 ], have been synthesized and characterized by XRD, FT-IR, TG techniques. The molar enthalpies of solution of 2.51 mg of GeO 2 (s)/0.99 mg of H 3 BO 3 (s)/1.98 mg of H 3 BO 3 (s) in 2.00 cm 3 of 1 mol · dm −3 NaOH (aq) were measured, respectively. The molar enthalpies of solution of 2.44 mg of K 2 B 4 O 7 · 4H 2 O (s) and 2.18 mg of NH 4 B 5 O 8 · 4H 2 O (s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 NaOH (aq) which contains 2.51 mg of GeO 2 (s) were measured, respectively. The molar enthalpies of solution of 3.82 mg of β -K 2 [B 2 Ge 3 O 10 ] (s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 NaOH (aq) which contains 0.99 mg of H 3 BO 3 (s), and 3.00 mg of NH 4 [BGe 3 O 8 ] (s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 NaOH (aq) which contains 1.98 mg of H 3 BO 3 ) (s) were also measured, respectively. With the use of standard molar enthalpies of formation for NH 4 B 5 O 8 · 4H 2 O (s), K 2 B 4 O 7 · 4H 2 O (s), GeO 2 (s), H 3 BO 3 (s) and H 2 O (l), the standard molar enthalpies of formation of – (3937.1 ± 4.7) kJ · mol −1 for β -K 2 [B 2 Ge 3 O 10 ] and – (2713.7 ± 6.0) kJ · mol −1 for NH 4 [BGe 3 O 8 ] at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles, respectively.
研究领域:
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）