JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Honglin Xu,Yongsheng Deng,Xinyu Wang,Ruilin Wang
The stable phase equilibrium of the ternary system NaVO3–KVO3–H2O at 298.15 K was investigated using the isothermal solution equilibrium method and the Schreinemaker wet residue method. The equilibrium liquid phase solubility data and physical property data [density (ρ), refractive index (nD), pH] were determined, and X-ray diffraction was utilized to verify the material composition of the equilibrium solid phase. Phase diagrams and physical property–composition diagrams were constructed based on the equilibrium solubility data and physical property data. The results show that the ternary system has a complex salt generation process with two invariant points, three univariate curves, and three crystalline phase regions corresponding to NaVO3·2H2O, KVO3, and Na2mKn(VO3)2m+n, respectively. The solid phase precipitated from a saturated NaVO3 solution at 298.15 K is NaVO3·2H2O, as confirmed by a comparison of experimental results and the literature. The chemical composition of the complex salt generated from the NaVO3–KVO3–H2O ternary system follows the general formula of the Na2mKn(VO3)2m+n complex salt proposed by Druzynski’s group, thereby validating the reliability of the present experiment. This study provides new experimental data for the preparation and separation of metavanadate.
研究领域:
化学热力学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yunfei Chen,Mingyong Wang,Songle Lu,Jiguo Tu,Shuqiang Jiao
s Electrochemical conversion of CO 2 to carbon in molten salts is a promising route for the high-value utilization of greenhouse gases . Low graphitization degree of carbon materials is the limiting issue for potential applications. In the past, catalytic effect for the electrochemical conversion of CO 2 was not achieved in molten salts due to carbon coverage on heterogeneous solid electrode. A novel and feasible homogeneous catalytic strategy by soluble NaVO 3 in carbonate molten salt was proposed for the enhanced electrochemical conversion of CO 2 to carbon with high graphitization degree. It was found that graphite consisting of carbon nanotubes and sheets were more easily produced by adding NaVO 3 into molten salt. The graphitization degree of carbon products was obviously improved and I D / I G value was only 0.428. During CO 2 electrolysis, vanadate in the form of V 2 O 7 4− will be co-electroreduced to V 2 O 3 . Meanwhile, V 2 O 7 4− ions can be regenerated by the spontaneous reaction between the newly-formed V 2 O 3 and carbonate, which also accelerates the production of graphite. Therefore, a continuous homogeneous in-situ catalytic cycle was achieved for the enhanced graphitization conversion of CO 2 . It provides a novel and effective way to prepare carbon materials with high graphitization degree from CO 2 .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 17
·期 1
·335-342
·
IF 6.852
Muge Niu,Yucui Hou,Shuhang Ren,Wenhua Wang,Qitian Zheng,Weize Wu
Conversion of cellulose, the most abundant biomass, shows a high selectivity to yield formic acid (FA), when oxidized by O2 in NaVO3–H2SO4 aqueous solution. This conversion involves various reactions including hydrolysis and oxidation. In this work, the relationships between these reactions were studied. There are mainly two hydrolyses and two oxidations occurring in the conversion: initial hydrolysis (from cellulose to monosaccharides) and deep hydrolysis (from monosaccharides to levulinic acid); catalytic oxidation (from monosaccharides to FA) and ordinary oxidation (from levulinic acid to acetic acid). Among these four reactions, catalytic oxidation to FA and deep hydrolysis to byproducts are competitive. The increasing rate of deep hydrolysis is faster than that of catalytic oxidation, when temperature is increased. Catalytic oxidation is promoted and deep hydrolysis is suppressed, when the O2 pressure is increased. Moreover, deep hydrolysis is promoted and catalytic oxidation is suppressed, when H2SO4 concentration is increased. The hydrolysis–oxidation pathway of this conversion was proposed. Thus, the byproducts could be inhibited, and FA-oriented transformation could be realized.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yifan Zhang,Xianwei Hu,Fengguo Liu,Jiaxin Yang,Liyu Chen,Wenju Tao,Aimin Liu,Zhongning Shi,Zhaowen Wang
In the present study, the reaction process and reaction mechanism of the aluminothermic reduction of NaVO 3 to prepare aluminum-vanadium intermediate alloy were investigated by experimental analysis and quantum chemical calculations. The results of thermal analysis and isothermal experiments indicated that the aluminothermic reduction of NaVO 3 was a multi-step process and temperature played a critical role in this process. The aluminum-vanadium intermediate alloy was generated when the temperature exceeded 963 ºC, and it could be further separated from the reduction product after the addition of slag-forming agents (CaO and CaF 2 ) at 1600 ºC. Furthermore, an atomic-level insight into the reaction between aluminum and NaVO 3 was explored based on the electrostatic potential (ESP) analysis of the reactivity of NaVO 3 . The results showed that the aluminum atom first interacted with NaVO 3 to form an intermediate complex through electrostatic interaction , and then NaVO 3 was reduced to NaVO 2 under the continuous action of aluminum. Further, the newly formed NaVO 2 was consequently converted to aluminum-vanadium intermediate alloy under the continuous action of aluminum atoms. These theoretical results were essentially consistent with the experimental data, which provided a fundamental understanding about the reaction mechanism of NaVO 3 with Al. Moreover, the aluminothermic reduction of NaVO 3 also provided a feasible and environmentally friendly metallurgical approach for preparing aluminum-vanadium intermediate alloy.
研究领域:
冶金学
·
量子化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2017
·
IF 3.752
Muge Niu,Yucui Hou,Weize Wu,Ru Yang
Catalytic oxidation of lignocellulose in hydrothermal condition catalyzed by vanadium-containing homogeneous catalysts is a promising method to prepare formic acid (FA), a potential material in emerging field of clean energy technologies . The FA production from polysaccharides components of lignocellulose has already been well studied. However, the conversion of lignin component, which quite differs in structure from polysaccharides, has not been studied systematically. In this work, the lignin degradation was studied in NaVO 3 -H 2 SO 4 aqueous solution with O 2 as oxidant. The degradation mechanism was studied in detail. Compared with polysaccharides, lignin can produce a much lower yield of FA with a formation of a larger amount of CO 2 . H 2 SO 4 can catalyze highly-polymerized lignin to segments by C O bond hydrolytic cleavage, but the conversion is limited. NaVO 3 and O 2 can accelerate the lignin degradation by weakening the C O bond. In liquid phase, NaVO 3 and O 2 , with a low selectivity on products, lead to different kinds of reactions, mainly including phenolic hydroxyl oxidation to quinone , aliphatic hydroxyl oxidation to ketone/aldehyde, aliphatic C C bond cleavage , intramolecular dehydration and decarboxylation . This study gives a deep understanding of lignin transformation during catalytic oxidation, and provides guidance to the further application of FA production from natural lignocellulose.
研究领域:
生物质化学
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可再生能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Fangwei Liu,Kunkun Wei,Youwen Chen,Jingbo Hu,Yue Wang,Chengyuan Liu,Yang Pan,Xutao Chen,Shihui Zou,Jie Fan
The production of C 2 H 3 Cl from CH 3 Cl (MCTV) represents a promising non-petroleum route for synthesizing C 2 alkenes from C 1 molecules. Exploration of new MCTV catalysts is crucial for advancing sustainable chemical production. In this study, we present NaVO 3 as a surface-confined coupling center for • CH 2 Cl radicals, demonstrating its superior performance in the selective coupling of methyl chloride to synthesize vinyl chloride. By incorporating NaVO 3 onto the surface of CeO 2 , the catalyst enables effective capture of • CH 2 Cl radicals during the CH 3 Cl oxidative pyrolysis and their subsequent conversion into C 2 H 3 Cl. We experimentally validate the capability of highly dispersed NaVO 3 to controllably couple • CH 2 Cl radicals through in-situ synchrotron-based vacuum ultraviolet photoionization mass spectrometry. The results demonstrate that the dispersion of NaVO 3 on the catalyst surface has a considerable impact on the reaction efficiency of • CH 2 Cl radicals and the overall MCTV performance. This discovery holds substantial implications for the controlled C 1 radical transformation and provides a guidance for the design of catalysts for sustainable production of C 2 H 3 Cl.
研究领域:
催化
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化学合成
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可持续化学
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表面化学
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反应工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
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IF 2.605
Yu Hui,Sumei Zhao,Jiaying Xu,Binglin Zou,Ying Wang,Xiaolong Cai,Ling Zhu,Xueqiang Cao
Degradation due to molten salt attack is one of the failure mechanisms of thermal barrier coatings . Thermochemical attack of the salt mixture Na 2 SO 4 –30 mol% NaVO 3 on ZrO 2 –8 mol% YO 1.5 (8YSZ) at 1100 °C for different times was investigated. In the present study, 8YSZ powder was synthesized using co-precipitation route. The graded morphologies and phase compositions were examined using SEM, XRD and Raman before and after hot corrosion test. The results obtained from XRD have shown that m-ZrO 2 and YVO 4 were the main corrosion products after hot corrosion test at 1100 °C. The results obtained from SEM and EDS observations have shown that large polyhedron crystals of m-ZrO 2 and rod-like crystals of YVO 4 formed as hot corrosion products after hot corrosion test for 6 h and 24 h. The phase transformation and chemical interaction are the primary corrosion mechanisms for degradation of 8YSZ ceramic.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhonghua Zhao,Mingyong Wang,Yunfei Chen,Yongzheng Jia,Jialiang An,Shuqiang Jiao
Vanadium oxide s, such as V 2 O 5 and V 2 O 3 , are important metallurgy products and mainly used to prepare V-based alloys for steelmaking. At present, vanadium oxide s are mainly produced by complex sodium salt roasting process. Serious environmental pollution, such as emission of ammonia nitrogen wastewater and NH 3 , are restrictive problems. Here, a clean and sustainable method for V 2 O 3 preparation is proposed by one-step molten salt electrochemical reduction of soluble NaVO 3 , i.e. an indispensable intermediate in traditional V metallurgy. The pollution issues are well solved. The theoretical decomposition voltages of different vanadate to various low-valence vanadium oxides were calculated. NaVO 3 with a solubility of 14.7 wt% is the most suitable vanadate for the direct preparation of V 2 O 3 by molten salt electrolysis. The effects of cathode structure, NaVO 3 content, electrolysis temperature and voltage on current efficiency and electricity consumption were systematically studied. High-purity V 2 O 3 with uniform particle distribution is obtained and the lowest electricity consumption is only 2.86 kWhkg −1 . V 2 O 3 is mainly produced by one-step electrochemical reduction of soluble NaVO 3 through two-electron transfer process. The economic evaluation for ferrovanadium production is preliminarily carried out. Compared with the traditional process, the cost for ferrovanadium production is lower by the aluminothermic reduction of V 2 O 3 which is prepared by clean one-step electrolysis of soluble NaVO 3 .
研究领域:
冶金工程
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材料科学
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环境科学
·
电化学
·
资源利用
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 17
·期 1
·453-459
·
IF 6.852
Muge Niu,Yucui Hou,Shuhang Ren,Weize Wu,Kenneth N. Marsh
Formic acid (FA) is an important material widely used in the chemical industry and in processes involved in energy storage and transformation. In this work, production of FA from wheat straw, an abundant lignocellulosic biomass, in NaVO3–H2SO4 aqueous solution with molecular oxygen (O2) was studied. The conversion showed high efficiencies: 47% (based on carbon, 75.2% based on mass) of FA and 7.3% (based on carbon, 7.6% based on mass) of acetic acid were obtained. The products mainly come from polysaccharides (hemicellulose and cellulose) in wheat straw. Acetic acid is derived from the acetyl groups in (1) the hemicellulose structure or (2) the deep hydrolysis product, levulinic acid. The removal of each lignocellulosic component in wheat straw follows the order: hemicellulose, lignin and cellulose. The catalytic system shows good reusability, and multiple feedings led to a high concentration of FA, which is beneficial to reduce FA–water separation cost.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yifan Zhang,Xianwei Hu,Jiaxin Yang,Liyu Chen,Wenju Tao,Fengguo Liu,Zhongning Shi,Zhaowen Wang
Aluminum-vanadium intermediate alloy is a significant raw material for the fabrication of high-performance titanium alloys . In the present study, the electrochemical behavior of NaVO 3 on a solid molybdenum and liquid aluminum electrode is systematically investigated by cyclic voltammetry (CV) and square wave voltammetry (SWV) in the NaF-KF-AlF 3 molten salt and the formation mechanism of Al-V intermetallic compounds is emphatically analyzed. The results show that the electrochemical reduction of VO 3 − on the solid molybdenum electrode is a multi-step process and low-valence vanadium oxide (V 2 O 3 ) is obtained. In contrast, the electrochemical reduction of VO 3 − to V 2 O 3 on liquid aluminum electrode is through one-step process and the deposition potential is more positive than that on molybdenum electrode owing to the depolarization effect of the liquid aluminum electrode. In addition, Al-V intermetallic compounds are obtained on the liquid aluminum electrode by potentiostatic electrolysis. The reduction process of VO 3 − on the liquid aluminum electrode is described as: the electrochemical process is started by the direct electro-reduction of VO 3 − to V 2 O 3 , which is further converted to Al-V intermetallic compounds under the combined effect of electrochemical and aluminothermic reduction, with the latter playing a dominant role.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yang Xu,Handong Jiao,Mingyong Wang,Shuqiang Jiao
Vanadium-aluminum (V-Al) alloy, the master alloy for the well-known Ti-6Al-4V alloy, is mainly produced via aluminothermic reduction process of V 2 O 5 over the past decades. However, the reaction rate is too fast and it is difficult to control the product quality. Moreover, the utilization of aluminum is very low due to the production of Al 2 O 3 . In this work, a new method is proposed to prepare V-Al alloys by molten salt electrolysis of soluble NaVO 3 on a liquid aluminum (Al) cathode in molten NaCl-KCl melt. The results show that VO 3 − ions can be reduced to metallic V-Al alloys on the liquid Al cathode during electrolysis process. Furthermore, thermodynamic and electrochemical analysis indicate that the reduction of VO 3 − ions on the liquid Al cathode results from the combined effect of electroreduction and aluminothermic reduction. In this process, the liquid Al can not only reduce VO 3 − ions to V, but also to combine with vanadium to form V-Al alloys. However, unlike the traditional aluminothermic reduction process, alumina produced due to the aluminothermic reduction will be in-situ electro-reduced to aluminum, which will be helpful to increase the utilization of aluminum. As a result, when the electrolysis voltage is enough large, VO 3 − ions will be completely reduced. Al 3 V alloy without alumina can be obtained.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Xiaopeng Hu,Sai Liu,Qing Liu,Yang Su,Junyao Wu,Zhihang Xie,Jinwei Guo,Wang Zhu
The service life of thermal barrier coatings (TBCs) in calcium magnesium aluminosilicate (CMAS) and molten salt environments has become a key factor in determining engine reliability and safety. The effect of interface roughness (bond coating surface roughness) on the CM (CMAS + molten salt (Na 2 SO 4 + NaCl + NaVO 3 )) corrosion resistance of electron beam physical vapor deposition (EB-PVD) TBCs is investigated. The addition of molten salts lowers the melting point of CM, leading to more severe destructive effects compared to single CMAS corrosion. Moreover, the 1200# specimen (Ra = 2.0 μm) exhibits the best resistance to CM corrosion. The adjustment of interface roughness significantly alters the microstructure of the top-ceramic coating and induces changes in crack patterns after CM corrosion. Therefore, appropriately reducing interface roughness is key to improving the isothermal CM corrosion resistance and high-temperature CM corrosion-induced thermal shock performance of TBCs.
研究领域:
材料科学
·
腐蚀与防护
✓ 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）