CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yu Wang,Zhi-Bo Li,Kai-Fei Wang,Guo-Hua Zhang
Tungsten borides are special compounds with potential applications in superhard materials, anti-friction materials, and catalytic materials. In this study, a new synthetic method for tungsten boride is proposed using tungsten (W) and boron carbide (B 4 C) as raw materials. First, the boronization reaction between W and B 4 C was carried out at a high temperature; then, the boronization products were reacted with calcium to generate CaC 2 for decarburization. After acidic leaching of the CaC 2 and Ca, pure tungsten boride could be prepared. By investigating the reaction between different ratios of W and B 4 C, it was found that only pure W 2 B and WB were synthesized in the current method, and W 2 B 5 could react rapidly with Ca to form WB and CaB 6 . However, in the absence of a decarburization treatment after the boronization process, carbon-containing WB (C content = 1.2 wt%) and W 2 B 5 (C content = 3.4 wt%) could also be prepared. In addition, it was concluded that the prepared tungsten boride roughly maintained the morphology and particle size of raw W, and ultra-fine tungsten boride could be synthesized with ultra-fine W powder at a low boronization reaction temperature.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Geochemistry
·
2024
·
IF 2.6
Guanghui Li,Zheyi Zhang,Qian Wei,Fen Jiao,Congren Yang,Wei Li,Wenqing Qin
In this study, a new process of pre-flotation decarbonization‑lead flotation‑zinc flotation was proposed to recover valuable metals from a lead‑zinc ore in Guizhou by beneficiation and to determine a reasonable and economic beneficiation process. The results of the study demonstrate that the novel process aids in the flotation of lead and zinc ores in two ways: (1) pre-decarbonization using MIBC (methyl isobutyl carbinol) and kerosene synergistically achieved the lowest loss of lead recovery of 1.94 % and zinc recovery of 1.14 % in the decarbonized product. (2) the successful separation and retrieval of lead and zinc metals were accomplished via a preferential flotation technique, using several combinations of reagents. This procedure yielded a lead recovery rate of 87.64 % and a zinc recovery rate of 94.09 %.
研究领域:
矿物加工工程
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 4
·2399-2406
·
IF 3.094
Yu Wang,He Zhang,Shuqiang Jiao,Kuo-Chih Chou,Guo-Hua Zhang
Molybdenum boride is an ideal hard and wear-resistant material. In this study, a new method is proposed for preparing molybdenum boride, by which Mo first reacts with B 4 C to generate the mixture of molybdenum boride and C, and then the product is decarburized by molten Ca to generate CaC 2 . Pure molybdenum boride could be obtained after acid leaching to remove the by-product CaC 2 . According to the experimental and thermodynamic calculation results, it is concluded that the single-phase MoB could be successfully prepared, while Mo 2 B, Mo 2 B 5 , and MoB 4 could not be synthesized by this method. Moreover, it was found that the particle size of finally prepared MoB is determined by particle size of raw Mo powder. The residual carbon content of the product could be decreased to 0.10 wt% after first reaction at 1673 K for 6 hours and then decarburization reaction at 1673 K for 6 hours.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiao-Hui Yang,Yu Wang,Guo-Hua Zhang,Kuo-Chih Chou
Tungsten and molybdenum borides are widely used in ultra-high temperature ceramics (UHTCs) and electrode material. In this research, ultra-fine and ultra-coarse binary borides (WB, W 2 B 5 , MoB, Mo 2 B 5 ) and MoAlB powders were prepared with W/Mo and B 4 C as raw materials and Ca/Al as the decarbonization agent. The feasibility of using Ca and Al as decarburizing agents was assessed by thermodynamic calculations. Meanwhile, the effects of reaction temperature, decarbonization agent type and its additional amount on the phase, morphology and size distribution of the powder products were thoroughly investigated. The results revealed that single phase products with carbon content of less than 1 wt% could be prepared. Moreover, the morphology and particle size of products were significantly affected by the reaction temperature and type of decarburization agent. When using Ca as the decarburizing agent, ultra-fine WB and MoB powders were effectively prepared, probably owing to the fact that W/Mo are essentially insoluble in Ca melt. However, the great solubility of W/Mo in Al makes it easily to synthesize ultra-coarse borides at high temperatures via the dissolution-precipitation mechanism. Additionally, ultra-fine borides particle can also be prepared by lowering the temperature and amount of Al to weak the dissolution-precipitation mechanism.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL SOCIETY REVIEWS
·
2023
·Vol. 52
·期 17
·6031-6074
·
IF 46.2
Ziming Zhao,Xianghui Liu,Mengqi Zhang,Leyuan Zhang,Changkun Zhang,Xianfeng Li,Guihua Yu
Realizing decarbonization and sustainable energy supply by the integration of variable renewable energies has become an important direction for energy development. Flow batteries (FBs) are currently one of the most promising technologies for large-scale energy storage. This review aims to provide a comprehensive analysis of the state-of-the-art progress in FBs from the new perspectives of technological and environmental sustainability, thus guiding the future development of FB technologies. More importantly, we evaluate the current situation and future development of key materials with key aspects of green economy and decarbonization to promote sustainable development and improve the novel energy framework. Finally, we present an analysis of the current challenges and prospects on how to effectively construct low-carbon and sustainable FB materials in the future.
研究领域:
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Zhenchao Ma,Zhe Li,Yingying Wang,Mengdi Xu,Ying Zhou,Xuesong Yang,Lei Wang,Yaowen Xing,Bobo Zhou,Xiahui Gui
The presence of unburned carbon seriously restricts the reasonable disposal and utilization of coal gasification fly ash (CGFA), leading to resources waste and environmental pollution. Due to the abundant micropores and hydrophilic structures on the surface of unburned carbon, the conventional flotation decarburization efficiency of CGFA is low. In this study, the stirred mill and saline water were synergistically applied to enhance the flotation decarburization efficiency. The synergistic mechanism between stirred mill and saline water was revealed through comprehensive characterization of surface morphologies, particle size distribution, pore structure evaluation, contact angle measurement, and surface property assessment. The results demonstrated that CGFA achieved a decarburization efficiency of 87.85 % by stirring mill grinding at 600 rpm for 10 min. There are three key reasons: preferential exposure of carbonaceous components, median particle size reduction to 8.11 µm with specific surface area decrease to 21.277 m 2 /g, and an increase in contact angle of 29.73°. Subsequent saline water treatment further improved efficiency to 94.41 % (0.8 mol/L Na + ) and 96.16 % (0.4 mol/L Mg 2+ ). This is caused by three complementary mechanisms: surface tension reduction, foam stabilization, and Zeta potential modulation. Consequently, the synergistic collaboration of stirred mill and saline water exhibit remarkable performances and can be used as an ideal candidate for flotation decarburization of CGFA.
研究领域:
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
SOLAR ENERGY
·
2019
·
IF 4.674
Azhar Abbas Khosa,C.Y. Zhao
CaCO 3 is a promising material for thermochemical energy storage (TCES) systems. It can store and release heat upon reversible decarbonation to CaO, which emits heat through carbonation. Decarbonation temperature of CaCO 3 directly affects the properties of CaO, which influences heat supply in result. The current research studies CaCO 3 /CaO system, specifically analyzing the conversion of CaO into CaCO 3 (carbonation) for various CaO samples prepared at decarbonation temperatures between 600 and 975 °C. A relation is developed using regression analysis to verify the linearity between reactivity of CaO samples and decarbonation temperature at which it was prepared. The carbonation of all CaO samples at various partial pressures of CO 2 and temperatures is also analyzed. The whole process is performed for pure and SiO 2 doped systems (molar ratio 1:1). The efficient performance of CaCO 3 /CaO system is noted for decarbonation temperatures above 750 °C or below 925 °C for pure material. While for doped material, the decarbonation temperature for efficient performance lies between 700 °C and 800 °C. Both systems performed with higher efficiency when CO 2 pressure was kept constant and the carbonation temperature was increased.
研究领域:
材料科学
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能源工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 21
·7330-7335
·
IF 4
Luofu Min,Jingying Duan,Chuan Song,Yanan Chen,Wen Zhang,Yuxin Wang
Layered double hydroxides (LDHs) intercalated with tunable anionic species are finding increasingly wide applications. While LDHs with intercalated CO32− anions (LDH-CO3) are usually synthesized to achieve high crystallinity, the substitution of the intercalated CO32− with other desired anions is rather difficult because of the ultra-high affinity of CO32− to LDHs’ main plates. Herein, we report a novel and facile method to overcome this difficulty. LDH-CO3 is decarbonated via submerging in a carbonated NaCl solution with CO2 bubbling. Complete deintercalation of CO32− is achieved quickly without damaging the main plates, i.e., the hydroxide layers, even in the case of Mg2Al-LDH-CO3 having the most stable CO32− anions. It is shown that carbonic acid H2CO3 in the salt solution reacts with intercalated CO32− to form bicarbonate (HCO3−), which exhibits a much lower affinity to the main plates and thus is easily substituted by chloride ions (Cl−) from the salt solution.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2020
·
IF 5.647
Jia Liu,Jan Baeyens,Yimin Deng,Tianwei Tan,Huili Zhang
The abatement of CO 2 emitted from combustion is a hot research topic. Current CO 2 capture techniques of adsorption, absorption, membrane separation and cryogenics involve high investment and operation costs. For moderate and high temperature exhaust gas, carbonation/decarbonation cycles offer an attractive alternative. An objective assessment method (screening index) was applied to select the most appropriate chemical reactions, with MgO and Mg(OH) 2 being screened as having the highest potential. Macro-thermogravimetric experiments determined a CO 2 capture yield between 60 and 70% for Mg(OH) 2 at temperatures between 260 and 330 °C, and from 85 to 98% for MgO at temperatures of 400–440 °C. Reaction rates were measured for both MgO–CO 2 and Mg(OH) 2 –CO 2 . The reaction kinetics are best fitted by the Jander 3D-diffusion approach. The Arrhenius equation is applied to the reaction rate constant, and both its activation energy and pre-exponential factor are determined. Integrating the Jander expression in the reaction rate equation enables to predict the CO 2 -capture conversion for any selected temperature and/or contact time.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mingkai Liu,Yunlian Liu,Yang Li,Xuyun Wang,Ying Pan,Hongguang Jin
Coupling chemical looping steam methane reforming (CL-SMR) with sorbents comprises a promising approach for enhancing high-purity H 2 production. However, the lack of energy-efficient pathway with high CO 2 capture performance sorbents hinders its development. Herein, we prepare lithium-based absorbent particles with porous micromorphologies and large surface areas using various Li-precursors, alkali metal dopants, and particle sizes, achieving fast CO 2 sorption-desorption kinetics, high absorption capacity of 0.30 g CO 2 g −1 Li 4 SiO 4 , and excellent cyclic stability at a low CO 2 concentration (10 vol%). Absorbent paritcles measuring 1 mm, using lithium carbonate as Li-precursor and doped with 20 mol% potassium, demonstrated a high CO 2 conversion of 63.7% and a crushing mechanical strength of 25 N over 200 isothermal sorption-desorption cycles. In addition, the enhancement of absorbent particles for CL-SMR was evaluated in a fixed-bed reactor. Mechanical mixed with nickel-based oxygen carriers, lithium-based absorbent carbonation enables the in-situ CO 2 removal in CL-SMR process, along with elevated methane conversion (93.3%), hydrogen purity (92.8%), and hydrogen production rate (9.45 mL min −1 g −1 ) in a single step, while the energy demand of calcination is reduced at mild temperatures (500–600 °C). The incorporation of lithium-based absorbents facilitated an alternative reforming mechanism, yielding a notable 15.2% reduction in the apparent activation energy. In-situ DRIFTs experiments, combined with XRD and XPS characterization, further revealed that lithium ions in the absorbent interact with CO 2 to form lithium carbonate. This process facilitates in-situ decarbonization, promotes the water-gas shift reaction, and enhances the production of high-purity hydrogen.
研究领域:
化学工程
·
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Ya-Jun Wang,Ya-Nan Zeng,Jun-Guo Li,Yu-Zhu Zhang,Ya-Jing Zhang,Qing-Zhong Zhao
This study focuses on evaluating the carbonation potential of argon oxygen decarburization (AOD) slag and analyzing influence mechanism of carbonation on chromium leachability . Static thin-film accelerated carbonation and sequential leaching tests were carried out. Results show that the liquid to solid (L/S) ratio was the most influencing factor for AOD slag’s carbonation, and the maximum carbonation ratio of AOD slag was 50–52% (L/S = 0.4 mL/g, P CO2 = 7.5 bar, and t > 6 h). Dicalcium silicate’s carbonation resulted in the generation of amorphous calcium carbonate , crystalline calcite and silica gel . AOD slag’s smooth surface could be eroded by these products gradually with carbonation furthered. The mineral phase evolution clearly influenced the mineral phase hydrolysis and physical encapsulation, and thus affected the hydrolysis behavior of the primary phase and the generation behavior of the secondary phase in the carbonated slags. Chromium leachability (20 days) declined to its lowest value (1.7 mg/kg) as the carbonation ratio growing to 23% and then increased to its highest value (7.9 mg/kg) with the carbonation ratio increasing to 52%. Chromium leachability varies with the carbonation ratio. The optimal carbonation ratio that resulting in minimum chromium leaching risk must be taken full in mind before using AOD slag in carbonation-related production activities.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Donglin Jiang,Yuanyuan Xie,Zezhi Chen,Huijuan Gong,Huiqiang Yu,Lu Chen
Zeolitic Imidazolate Framework-8 (ZIF-8) shows potential as a carbonic anhydrase-mimicking catalyst for enhancing carbon dioxide (CO 2 ) absorption in industrial decarbonization solvents. This study synthesized ZIF-8 with high Brunauer-Emmett-Teller (BET) specific areas and their dopamine-modified hydrophilic derivatives (ZIF-8-DA) via a one-step method, aiming to maximize ZIF-8’s catalytic performance in CO₂ hydration. Both ZIF-8 and ZIF-8-DA effectively promoted CO₂ absorption in water and alkaline solvents, with excellent stability and reusability. Among them, ZIF-8-DA (220) exhibited the highest catalytic activity, achieving absorption enhancement efficiencies of 95.54% in water, 35.26% in diethanolamine (DEA) solution, and 18.42% in potassium carbonate (K₂CO₃) solution. Compared with ZIF-8, ZIF-8-DA showed better water dispersibility-a key to its higher activity. Dopamine modification significantly improved the hydrophilicity of ZIF-8, enabling stronger interactions with CO₂ in the aqueous phase and facilitating nucleophilic attack on CO₂. Importantly, the modification preserved ZIF-8’s structure, ensuring reusability across multiple absorption cycles. This research underscores that ZIF-8-DA with high BET specific area holds substantial potential as an efficient and durable carbonic anhydrase- mimicking catalyst for industrial CO₂ capture.
研究领域:
无机化学
·
催化
·
环境科学
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材料科学
·
化学工程
✓ 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）