APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Zilong Shao,Shunan Zhang,Xiaofang Liu,Hu Luo,Chaojie Huang,Haozhi Zhou,Zhaoxuan Wu,Jiong Li,Hui Wang,Yuhan Sun
Methanol is a suitable raw material for in situ hydrogen generation by steam reforming that enables the safe storage and transportation of hydrogen. Pt-based catalysts have been considered promising and effective for methanol steam reforming but suffer from deactivation by metal sintering. In this study, we developed an efficient K-modified Pt catalyst confined within silicate-1 zeolite with a high activity and unprecedented stability for methanol steam reforming. Owing to the confinement effect, the K-promoted Pt@S-1 catalyst remained stable for more than 50 h. The combination of TPSR-MS and DFT calculations revealed that the Pt-K@S-1 catalyst exhibited a synergistic effect between the Pt 0 and Pt δ+ species. The cleavage of the O–H bond in CH 3 OH was activated over Pt 0 sites to produce HCOOCH 3 , whereas Pt δ+ sites promoted the hydrolysis of HCOOCH 3 to HCOOH and ultimately CO 2 and H 2 , thus suppressing the formation of CO and boosting H 2 production.
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 MOLECULAR LIQUIDS
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2020
·
IF 5.065
Xianzhao Shao,Maifang Zuo,Changchun Zhao,Wei Wang,Zhizhou Li
2,4-diamino-6-(4-pyridyl)-1,3,5-triazine (DAPT) was synthesized and analyzed by nuclear magnetic resonance and Fourier transform infrared spectroscopy , thermogravimetric and elemental analysis techniques as well as by high-resolution transmission electron microscopy. DAPT solubility (in tetrahydrofuran , methanol, ethanol, n-propanol, and isopropanol) in the 288.15–318.15 K range was measured using the static analytical technique. We also performed quantum chemical calculations using Gaussian 09 and determined influence of solvent polarity and solute-solvent interactions on DAPT solubility. Experimental results were treated by modified Apelblat and Buchowski-Ksiazaczak ( λh ) equations as well as by the Wilson and nonrandom two-liquid (NRTL) models. All four models showed excellent agreement. This study provides valuable data for the purification of DAPT at the preferential crystallization procedure.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2026
·
IF 19.9
Yu Zhong,Xiaojuan Chen,Xinyang Zhang,Lei Qin
The capacity and lifespan of superoxide-based potassium–oxygen batteries (POBs) are limited by the failure of the potassium (K) anode due to oxygen crossover. The high-concentration potassium bis(trifluoromethanesulfonyl)imide (KTFSI)/dimethoxyethane recipe enables efficient anode passivation, but its high viscosity and elevated cost necessitate the use of a highly fluorinated ether co-solvent. In this study, we elucidate the indeterminate role of fluoroether in constructing the anode passivation layer. The fluoroether participates with TFSI − anions to form a robust solid electrolyte interphase (SEI) that effectively mitigates oxygen crossover. Moreover, the fluoroether shows a Janus effect that excessive addition triggers severe K corrosion, while an optimal amount leads to a desirable SEI on the K surface. This SEI acts both as an oxygen permeation barrier and as an efficient K + -conductive channel. With a more stable environment for the K anode, a POB utilizing the KTFSI-based electrolyte delivers over 200 cycles (above 800 h) with low round-trip overpotentials and high average coulombic efficiency (98.1%) as opposed to one using the potassium hexafluorophosphate-based electrolyte that fails early. Spectroscopic analyses and theoretical simulations were utilized to elucidate the molecular-scale interactions in the electrolyte components. This study provides fundamental insights and practical strategies for the development of long-life POBs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Jing Li,Linglin Fu,Zongde Ma,Jinniu Chen,Changhao Wu,Nan Zhang,Xudong Yu
To understand the interrelationships within the multi-ion coexisting sulfate system during the solid–liquid transformation of polyhalite in the Bieletan area, phase equilibria of ternary systems M, Ca2+//SO42–-H2O (M = Na+, K+, Mg2+) at 288.2 K were studied by the isothermal dissolution equilibrium method. The solubility and density of the equilibrium liquid phases of the system were measured experimentally, and the composition of the equilibrium solid phase at the ternary invariant point was determined by X-ray powder diffractometry. It is found that the ternary system K+, Ca2+//SO42–-H2O at 288.2 K forms the double salt syngenite (K2SO4·CaSO4·H2O), while the systems Na+, Ca2+//SO42–-H2O and Mg2+, Ca2+//SO42–-H2O at 288.2 K only form with the formation of CaSO4·2H2O and Na2SO4·10H2O (MgSO4·7H2O). Multitemperature comparison of the M, Ca2+//SO42–-H2O (M = Na+, K+, Mg2+) systems shows that the phase diagrams of Mg2+, Ca2+//SO42–-H2O are consistent at the selected temperature, only containing CaSO4·2H2O and MgSO4·nH2O (n = 1, 6, 7). While K+, Ca2+//SO42–-H2O and Na+, Ca2+//SO42–-H2O change from 288.2 and 298.2 to 348.2 K, the phase diagram forms double salt(s) K2SO4·5CaSO4·H2O (Na2SO4·5CaSO4·3H2O and Na2SO4·CaSO4).
研究领域:
化学热力学
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无机化学
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相平衡
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地球化学
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矿物加工
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2017
·
IF 2.726
Ying Zhang,Xinxin He,Yutian Chen,Maogang He
The mutual diffusion coefficients of n -butanol + n -heptane and n -pentanol + n -heptane were measured over the mass fraction of n -butanol or n -pentanol from 0.05 to 0.95 at intervals of 0.10 and the temperatures 288.15 K, 298.15 K, 308.15 K and 318.15 K at 0.101 MPa. The measurements were carried out using a digital holographic interferometry system. The expanded relative uncertainty of the mutual diffusion coefficients was estimated to be less than 2.4%. The influences of temperature and composition on the mutual diffusion coefficients were investigated. Moreover, equations for the mutual diffusion coefficients of the two binary mixtures were fitted to the data as functions of mass fraction and temperature. The correlations represent the data with the absolute average of relative deviations (AARDs) of 1.1% for n -butanol + n -heptane and 0.77% for n -pentanol + n -heptane, respectively.
研究领域:
物理化学
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热力学
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传递现象
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溶液化学
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流体混合物
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2015
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IF 2.037
Haijun Han,Lijiang Guo,Dongdong Li,Ouyang Dong,Yan Yao,Ning Zhang,Dewen Zeng
In this work, the water activities of the NaCl–CaCl2–H2O and KCl–CaCl2–H2O ternary systems and of their sub-binary systems NaCl–H2O and KCl–H2O were measured using an isopiestic method at 323.15 K. The isopiestic composition line for the NaCl–CaCl2–H2O system was found to obey the Zdanovskii rule very well, whereas the KCl–CaCl2–H2O system deviated slightly. The addition of NaCl to an aqueous solution of CaCl2 decreased its water activity for all CaCl2 molalities. However, KCl was found to decrease and increase the water activity at low and high CaCl2 molality, respectively. The turning point appears at 8.0 mol·kg–1 CaCl2 solution. The Pitzer–Simonson–Clegg (PSC) model was applied to represent the water activity of the two ternary systems, and the calculated results are discussed.
研究领域:
化学
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物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Song Feng,Zhaohui Liu,Qincheng Bi,Hui Pan
The dynamic viscosities of n-dodecane were measured at temperatures between 303.3 and 693.3 K and pressures up to 10.0 MPa using a dual-capillary viscometer. The accuracy of the dual-capillary viscometer was improved by considering centrifugal effects and the thermal expansion of the capillary. The combined relative standard uncertainty in the dynamic viscosity was calculated to be 0.58–2.92 %. This study provides new data to check the accuracy of Huber’s correlations at supercritical pressures, and a small proportion of the data points at supercritical conditions where few experimental data have been reported. The average absolute deviation between the experimental data and the calculated data from Huber’s correlations is 0.97%, and the maximum absolute deviation is 6.79%. In the near-critical and supercritical region, the accuracy of viscosities of n-dodecane needs more experimental data for verification and to extend the theories.
研究领域:
化学工程
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物理化学
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热力学
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
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2020
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IF 2.762
Yanhui Yao,Yazhou Wen,Chunyu Yang,Jing Zhang,Qinghui Ren,Xiaohua Shi
In order to choose the suitable solvent for the synthesis of cyanuric acid from urea through the liquid phase pyrolysis method, the solubilities of urea and cyanuric acid in eight kinds of pure solvents, N,N -dimethyl formamide, cyclohexanol, N,N -dimethyl acetamide, 1,2-propanediol, N -methylpyrrolidone, 2-methyl-1,3-propanediol, formamide and tetramethylene sulfone, were determined in the temperature ranging from 300.75 K to 369.45 K using the laser assisted-dynamic method under atmospheric pressure. The modified Apelblat model, van’t Hoff model and λh model were employed to correlate the solubilities of urea and cyanuric acid respectively, in which the Apelblat equation was better with the relative average deviation 0.18∼1.95 %. In addition, the thermodynamic properties of the dissolution processes were calculated and discussed based on the Apelblat equation, indicating that the dissolution process is an endothermic non-spontaneous entropy-driven process. Finally, formamide, 1,2-propanediol and 2-methyl-1,3-propanediol were selected as solvent for the synthesis of cyanuric acid from urea.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Yanhui Zhong,Yufei Hu,Gongke Li,Runkun Zhang
Identification of complex samples presents a difficult challenge for modern analytical techniques, and the differentiation among closely similar mixtures often remains indeterminate. In this article, we designed a simplified cyclic chemiluminescence (CCL) system that is able to measure multistage signals in a single sample injection. The system was used to investigate the CCL reactions of the binary, ternary, and multicomponent mixtures. Results showed that each mixture has a unique exponential decay equation (EDE) with a constant decay coefficient (k-value) to describe the change law of its multistage signals. Further studies found that different brands of liquor, beer, toner, and baby powder have different k-values, and the same brand of the commodities between different batches have the same k-values, which allows facile identification of these complex samples. We then used different catalysts to design digital codes of the k-value for further improving the identifying ability of CCL. Moreover, the multistage signals are like fingerprints and could be used for linear discriminate analysis, which provides another complementary approach for identification of complex samples. Finally, we demonstrated that CCL shows potential applications in certification and quality assurance according to the change of the k-values of the sample. This work demonstrates that excellent discrimination ability of CCL for the identification of complex samples and provides a promising technology for quality assurance.
研究领域:
分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Chaoyuan Wang,Yonghong Hu,Wenge Yang,Kai Wang,Yihua Li,Song Guo
The solubility of 2,3,4,5-tetrabromothiophene in (ethanol + tetrahydrofuran) binary solvent mixtures was measured within the temperature range from (278.15 to 322.15) K. The solubility increases with the rise of temperature, while it decreases with increasing ethanol content at constant temperature. The experimental data were fitted using the two variants of the combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R–K) equation and the Jouyban–Acree equation, respectively. All the three equations were proven to give good representations of the experimental values. Computational results showed that the variant two of CNIBS/R–K equation was superior to the other two equations. The thermodynamic properties of the solution process, including the Gibbs free energy, enthalpy, and entropy, were calculated by the van’t Hoff analysis. The values of both the enthalpy change and the standard molar Gibbs free energy change of solution were positive, which indicated that the process was endothermic.
研究领域:
化学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 6
·2102331
·
IF 6.389
Beibei Zong,Jianguo Deng,Qing Sun,Zizhao Zhang,Xiangxin Meng,Bo Shen,Bonan Kang,S. Ravi P. Silva,Geyu Lu
After perovskite became a star material, research on perovskite solar cells (PSCs) became a hot topic and developed rapidly. Electron transport layers (ETLs) with high mobility, low-defect state, and suitable energy level arrangement dominate the development of planar heterojunction PSCs. In this work, the K + and Cs + doped composite SnO 2 ETL ( x mg KC-SnO 2 ) by a continuous spin-coating of the x mg Cs + @KOH and SnO 2 aqueous solution shows a substantial improvement in carries extraction, transport and collection properties, leading to the increased fill factor (FF) from 72.48% to 81.00% of the planar heterojunction PSCs, and finally the champion device average efficiency is 21.62%. Moreover, this work improves the interface contacts between ETL/Perovskite, as it reduces energy disorder and simultaneously promotes electron transport, charge extraction at the interface, improve energy level alignment and quasi-Fermi level splitting, and decreased resistance for charge transfer in the device. In conclusion, this simple and effective method of improving the FF value provides a certain shortcut to the performance of plane heterogeneous perovskite devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xixi Chen,Ruxing Gao,Qiang Wang,Kehao Hu,Fenfen Wang,Chao Deng,Lujing Xu,Chundong Zhang,Ki-Won Jun,Seok Ki Kim,Tiansheng Zhao,Hui Wan,Guofeng Guan
Direct hydrogenation of CO 2 to liquid hydrocarbons via modified Fischer-Tropsch synthesis represents an appealing and sustainable route for efficient CO 2 utilization. However, the selective production of liquid hydrocarbons remains a significant challenge. In this work, we designed a series of carbon-coated K/Fe-C catalysts with various K loadings (ranging from 0 to 8 wt%) that enhance C 5+ hydrocarbon selectivity during CO 2 hydrogenation. It is found that the 4 K/Fe-C catalyst exhibits the highest C 5+ selectivity of 54.78 % at CO 2 conversion of 32.40 % and good stability within 100 h time-on-stream. This is attributed to the high dispersion of the Fe nanoparticles and the confinement effect of porous carbon matrix on the aggregation of Fe nanoparticles, resulting in high catalytic activity and selectivity. Meanwhile, the well dispersed K on the porous carbon matrix can reduce the particle size of Fe nanoparticles and promote the production of iron carbide active species for CO 2 -FTS, thus facilitating the selective formation of C 5+ hydrocarbons. Moreover, we also discussed a possible reaction mechanism for the direct hydrogenation of CO 2 to C 5+ hydrocarbons over the K/Fe-C catalysts. This study provides deep insights into the design of efficient Fe-C catalysts for converting CO 2 to liquid hydrocarbons.
研究领域:
催化化学
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环境科学
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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）