INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Ali Hammad,Fandi Ning,Siyi Zou,Yiyang Liu,Bin Tian,Can He,Zhi Chai,Qinglin Wen,Lei He,Xiaochun Zhou
Aluminum is the most abundant and promising material for hydrolytic hydrogen generation . It can be easily transported and stored. However, the oxide protective layer around Al limits its hydrolytic activity and hinders practical applications. To solve this problem, NaH is introduced to form the core-shell structure of Al-based NaH solid fuel powder by a simple hand mixing method in an open lab environment. The new core-shell structure of Al-based NaH solid fuel powder showed the best hydrolytic performance among Al-based materials and produced 98 % hydrogen yield at a 1 to 0.9 M ratio of NaH and Al in water. The hydrolytic activity consists of NaH hydrolytic splitting and Al hydrolysis. XRD and SEM analysis confirmed that NaH is the key to supporting complete Al hydrolysis and attaining maximum yield as compared to calcium hydride. Our research endorsed the practical implementation of inexpensive and transportable hydrolytic hydrogen generation materials and offered a new idea for the design of hydrolytic hydrogen generation materials for further development.
研究领域:
材料科学
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能源研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
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2024
·
IF 3.6
Chenyang Pu,Zhi Wang,Boren Zheng,Bin Zhang
1,2,4-Triazole is a common intermediate used in the synthesis of pesticides and medicine, and has a very wide range of applications. As a kind of polynitrogen heterocycles, 1,2,4-triazole will release a lot of heat during thermal decomposition. If there is no comprehensive understanding of its pyrolysis behavior, there will be a very large thermal safety risk in the process involving 1,2,4-triazole in industrial production. At the same time, the instability of the substance may be affected by the presence of impurities, and the existing research on this aspect is quite scarce. Therefore, it is very necessary to study the effect of adding other substances on the thermal decomposition of 1,2, 4-triazole. The thermal decomposition characteristics and thermal runaway behavior of 1,2, 4-triazoles were revealed by thermodynamic experiments and various kinetic theoretical methods. According to the risk matrix, the thermal runaway danger level of 1,2, 4-triazole was determined to be level Ⅲ, which was an unacceptable risk. The results show that 1,2, 4-triazole has a huge heat release and the effect of thermal runaway is serious. In this study, three substances involved in the industrial production of fluconazole and flutriafol mixed with 1,2, 4-triazole were selected to explore their influence on the thermal decomposition of 1,2, 4-triazole under non-working conditions. DSC and ARC experiments consistently showed that these three impurities could reduce the reaction heat release of 1,2, 4-triazole to varying degrees, and confirmed that these three impurities could reduce the risk of thermal runaway of 1,2, 4-triazole to varying degrees. Among them, sodium hydride has the most outstanding performance, both in terms of reducing reaction heat release and reducing adiabatic temperature rise. The results can provide reference for loss control of 1,2,4-triazole in industrial applications.
研究领域:
化学工程
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热力学
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安全科学
✓ 已验证
DOI
高影响因子
SN Applied Sciences
·
2021
·Vol. 3
·期 1
·1-10
·
IF 0
Li Yaxing,Yuan Shenfu
In this study, humic acids (HAs) were extracted from Chinese lignite by adding KOH to a NaOH solution. The extraction yield of HAs was found to improve because of the synergistic effect imparted by the alkali mixture of sodium hydroxide (NaOH) and potassium hydroxide (KOH). The maximum yield was obtained at 150 min by adding the mixture of 0.750 M NaOH + 0.710 M KOH to Xianfeng lignite at 80 °C. The potassium (K), sodium (Na), nitrogen (N), oxygen (O), and iron (Fe) contents were determined by X-ray diffraction, scanning electron microscopy, and proximate and ultimate analysis. The oxygen-containing functional groups in HAs were identified by Fourier transform infrared spectroscopy. The addition of KOH resulted in higher oxygen/carbon and nitrogen/carbon ratios and oxygen-containing functional groups, as compared with that in NaOH alone. The extractants containing KOH could release HAs with a higher proportion of K, Fe, N contents, which is beneficial for HAs fertilizers prepared from the lignite. The release of the nutrients (K, Fe, N) which are essential for the crops is determined by the KOH dosages.
研究领域:
化学
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农业科学
✓ 已验证
产品关联
DOI
ACS Applied Materials & Interfaces
·
2025
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IF 8.2
Ali Hammad,Siyi Zou,Fandi Ning,Bin Tian,Wei Li,Xiong Dan,Xi Cheng,Xiaochun Zhou
Hydrogen production from silicon (Si) hydrolysis is environmentally friendly, safe, portable, and promising. However, the self-protected oxide layer around Si and a sluggish hydrolysis rate impede its practical utilization. To address this problem, we introduced sodium hydride (NaH) to form the core–shell structure of NaH/Si composites via a straightforward one-step, hand-mixing method in an ambient environment. NaH-based Si-M composites exhibit 83% hydrogen yield and a 52.7 mL/min hydrogen generation rate at 1–0.7 molar ratios. The hydrolytic activity includes the breakdown of NaH and the continuous hydrolysis of Si. X-ray diffraction, scanning electron microscopy, nanoindentation, and reaction observation studies have verified that NaH is pivotal in promoting thorough Si hydrolysis and attaining the maximum achievable yield compared to calcium hydride (CaH2). NaH/Si composites showed excellent hydrogen generation performance compared to CaH2/Si composites with microstructure silicon Si-S ≈ 1–3 μm, Si-M ≈ 75 μm, and Si-L ≈ 75–425 μm. Our study provided an innovative design and idea for utilizing cost-effective and easily transportable hydrogen production materials for practical applications, which has the potential for further advancement.
研究领域:
材料科学
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能源化学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
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2018
·Vol. 8
·期 23
·13048-13053
·
IF 2.936
Wei Liu,Feifei Duan,Yanlan Bi
Epoxidized soybean oil methyl esters were prepared via transesterification of epoxidized soybean oil (ESBO) with methanol catalyzed by cheap and stable sodium hydroxide (NaOH). The transesterification could be completed in only 5 min at room temperature (25 °C) without loss of the epoxide function and the transesterification rate was promoted significantly while the utilization of 5% acetone as co-solvent. The afforded products epoxidized methyl esters represent a renewable substrate that is readily converted into surfactants, fuel additives and other valuable industrial products.
研究领域:
化学工程
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可再生资源利用
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工业化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Zhenji Li,Zhao Zhang,Jun Guo,Hongwei Jia,Wei Zhao,Lijun Lei,Que Huang,Lang Han,Changcheng Liu,Li Guo
MgH₂ is recognized as a promising material for hydrogen production due to its high hydrogen density, abundant availability, and non-polluting hydrolysis by-products, making it a viable hydrogen source for fuel cells. This study, for the first time, investigates the hydrogen production performance of the MgH₂-MOx-NaH (M = Ti, Zr, Mo, Fe, V, Bi) system, which exhibits remarkable hydrolysis properties in aqueous solutions. A series of MgH₂-MOx-NaH composite powders were synthesized via mechanical ball milling. The results revealed that V₂O₅-NaH and Bi₂O₃-NaH significantly enhanced the hydrolysis performance of MgH₂ for hydrogen production. Specifically, Bi₂O₃-NaH and V₂O₅-NaH effectively refined MgH₂ particles and mitigated agglomeration during the milling process. Hydrolysis tests demonstrated that the conversion rate and the hydrogen generation rate (mHGR) of composites initially increased with ball milling time and then decreased. The maximum hydrolysis hydrogen production yield and conversion rate for MgH₂-Bi₂O₃-NaH and MgH₂-V₂O₅-NaH composites occurred at a ball milling duration of 10 hours, and reached up to 1354.1 mL g⁻¹ (88.5 %) and 1273.5 mL g⁻¹ (81.8 %), respectively, within 8 minutes. Kinetic tests of hydrolysis hydrogen production showed that the reaction rate and hydrogen conversion increased with elevated hydrolysis temperatures. The activation energies for the hydrolysis of MgH₂-MOx-NaH (M = Ti, Zr, Mo, Fe, V, Bi) were calculated from the hydrolysis-hydrogen production curves using the Arrhenius formula, yielding values of 41.32, 37.66, 36.40, 34.60, 30.80, and 27.17 kJ mol⁻¹, respectively. The lower activation energies for hydrolysis indicate improved reaction kinetics, suggesting that the incorporation of transition metal oxides and sodium hydride effectively enhances both the hydrolytic conversion and reaction rate of MgH₂.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Yang Liu,Yan Wang,Wangfeng Cai
In this work, the salting effect of sodium hydroxide (NaOH) and sodium formate (HCOONa) on the liquid–liquid equilibrium (LLE) of polyoxymethylene dimethyl ethers (DMMn) in aqueous solution was studied. The LLE data of the systems (DMM1 + water) and (DMM2 + water) and the system (DMM1 + water + DMM2) under different concentrations of NaOH and HCOONa at 293.15 and 308.15 K were measured. According to the verification with the Marcilla-modified Eisen–Joffe equation, the experimental data has a good consistency. Distribution coefficients were calculated and compared, and the results showed that NaOH and HCOONa have a significant salting-out effect on DMMn and water separation. Based on the experimental LLE data, the original nonrandom two liquid (NRTL) and the electrolyte NRTL activity coefficient models were correlated by the maximum-likelihood principle, which showed that the electrolyte NRTL model was more appropriate. The experimental data and the binary interaction parameters could provide a useful reference for DMMn product reaction extraction before rectification.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Shijin Dai,Libing Liu,Hongping He,Bo Yang,Deli Wu,Youcai Zhao,Dongjie Niu
Molten salt has been increasingly acknowledged to be useful in the destruction of chlorine-containing organic wastes (COWs), e.g., organochlorine . However, the operational temperatures are usually high, and local structure and thermodynamic property of the molten salt remain largely unclear. In this study, novel molten NaOH-KOH is developed for organochlorine destruction, and its eutectic point can be lowered to 453 K with 1:1 mol ratio of NaOH to KOH. Further experiment shows that this molten NaOH-KOH is highly-efficient towards the destructions of both trichlorobenzene and dichlorophenol, acquiring the final dechlorination efficiencies as 88.2% and 94.1%, respectively. The organochlorine destruction and chloride salt enrichment are verified by fourier-transform infrared spectrometer . Molten NaOH-KOH not only eliminates the C-Cl and C C bonds, but also traps generated CO 2 , other acidic gases, and possibly particulate matters as a result of the high surface area and high viscosity. This makes it possibly advantageous over incineration for organic waste destruction for carbon neutrality . To sufficiently reveal the inherent mechanism for the temperature dependent performance, molecular dynamics simulation is further adopted. Results show that the radial distance between ions increases with temperature, causing larger molar volume and lower resistance to shear deformation. Moreover, thermal expansion coefficient, specific heat capacity, and ion self-diffusion coefficient of the molten NaOH-KOH are found to increase linearly with temperature. All these microscopic alterations contribute to the organochlorine destruction. This study benefits to develop highly-efficient molten system for COWs treatment via a low-carbon approach.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REPRODUCTION
·
2023
·
IF 3.8
Min Chen,Jia-Lu Shi,Zi-Meng Zheng,Zhi Lin,Ming-Qing Li,Jun Shao
The autophagy of trophoblasts is necessary for developing and maintaining of a healthy pregnancy. Autophagy dysfunction in trophoblast cells is linked to recurrent spontaneous abortion (RSA). However, the mechanism underlying trophoblast autophagy is unknown. In this study, we investigated the expression of autophagy-related genes in both normal and RSA villi. We also examined the production of lysophosphatidic acid (LPA) and lysophosphatidic acid receptor1 (LPAR1) in trophoblast cells during early pregnancy. We found that the activation of the LPA-LPAR1 axis triggered the autophagy of trophoblast cells and increased the expression of sodium/hydrogen exchanger 1 (NHE1). Inhibition of NHE1 suppressed the autophagy in trophoblast cells and we confirmed that NHE1 regulates LPA production in trophoblast cells. Additionally, we found decreased expression of autophagy-related genes and LPAR1 in villi from RSA patients. These observations indicate that the LPA/LPAR1-NHE1 axis regulates the autophagy of trophoblast cells during pregnancy. Insufficient autophagy and poor expression of LPAR1 in trophoblast cells may result in dysfunction of the trophoblasts and increased risk of spontaneous abortion. Overall, our research elucidated that a positive LPA/LPAR1-NHE1 axis can promote the autophagy of trophoblast cells and the abnormal axis leads to the autophagy deficiency of trophoblast cells in recurrent spontaneous abortion.
研究领域:
妇产科学
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分子生物学
·
生殖医学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Xiaotong Wei,Yuanyuan Hu,Chaomin Sun,Shimei Wu
The increasing emergence of multidrug-resistant pathogens and development of biopreservatives in food industries has increased the demand of novel and safe antimicrobial agents. In this study, a marine bacterial strain Bacillus licheniformis M1 was isolated and exhibited obvious antimicrobial activities against foodborne pathogens, especially against methicillin-resistant Staphylococcus aureus. The antimicrobial agent was purified and identified as a novel antimicrobial peptide, which was designated as bacipeptin, and the corresponding mechanism was further investigated by electron microscopy observation and transcriptomic analysis with biochemical validation. The results showed that bacipeptin could reduce the virulence of methicillin-resistant Staphylococcus aureus and exerted its antimicrobial activity by interfering with histidine metabolism, inducing the accumulation of reactive oxygen species and down-regulating genes related to Na+/H+ antiporter and the cell wall, thus causing damage to the cell wall and membrane. Overall, our study provides a novel natural product against foodborne pathogens and discloses the corresponding action mechanism.
研究领域:
微生物学
·
食品科学
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药学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）