JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
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2024
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IF 2.3
Xiaocui Deng,Zhennan Li,Jingang Yang,Xing Li,Qinming Xu,Gang Li,Qingmei Yuan
To enhance the longevity of materials, minimize maintenance expenses, and optimize material performance. The wall material employed in this study was urea-melamine-formaldehyde (UMF), and a dual microcapsule self-healing system was established by synthesizing two distinct microcapsules of epoxy resin and polymercaptan via an in situ polymerization technique. Moreover, the reaction conditions were optimized. The reaction parameters were as follows: core-shell ratio of 2:1, surfactant concentration of 0.6 g/L (sodium dodecyl benzene sulfonate (SDBS): Arabic gelatin (GA) = 2:1), polymerization pH = 3.5, stirring rate of 700r/min. Then, the two microcapsules (The mass ratio of the two microcapsules is 1:1) were added to the epoxy resin matrix at 0, 2.5, 5, 7.5, 10, and 12.5 wt% to prepare the resin matrix with self-healing properties. The conical double cantilever beam (TDCB) was used to test the mechanical properties of the matrix. The results showed that the matrix with microcapsule content of 10 wt% had relatively better comprehensive properties, and the self-healing rate was 49.87% at room temperature. These findings provide valuable insights and potential for advancing the development of self-healing materials.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2016
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IF 1.207
Jianwei Li,Xiang Li,Yan Liu,Jie Zhang
The application of ionic liquids as alternatives to conventional organic solvents in the extraction process has been investigated. In the present study, fourteen species of imidazolium-based ionic liquids were added into the NaOH (aq) to remove the mercaptans. The influences of anion species and cation alkyl chain length of the imidazolium-based ionic liquids on the performance of mercaptan removal from light oils have been discussed. The efficiency of extraction for mercaptans exhibited the order of [Ac] − > [OH] − ≈ [Br] − > [BF 4 ] − . The longer alkyl chain imidazolium-based ionic liquids contributed to enhance desulfurization rate of 1-butyl mercaptan. 100% desulfurization rate of 1-butyl mercaptan was achieved by the anion of Ac − ionic liquids and NaOH (aq) at a volume ratio of 40:1 ( V (oil): V (ionic liquid)) and a short equilibrium time within 10 min.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Yuhao Zhang,Mengqi Liu,Mengmeng Liu,Liang Zhao,Jinsen Gao,Chunming Xu,Xuhui Gao,Xiangqi Liu
The thioether and mercaptan components (over 50–100 mg/kg) of fluid catalytic cracking (FCC) naphtha must be removed to satisfy the rigorous sulfur content standard of the vehicle gasoline. Owing to the difference between the structures of thioether and mercaptan and that of thiophenic sulfur, the desulfurization process is usually divided. A serious loss of octane number (ON) occurs during typical desulfurization when the sulfur content is reduced to 10 mg/kg. With the oriented separation of FCC naphtha critical components process, the standard of sulfur content with losing 1 unit of ON can be satisfied. However, thioether and mercaptan require individual technologies for removal. Thioether, mercaptan, and thiophenic sulfur must be synchronously removed to improve the efficiency, simplify the technology, and reduce the energy consumption. In this study, quantum chemical calculation and ternary liquid–liquid equilibrium experiment were combined to investigate the effect of thioether and mercaptan structures on the sulfoxide solvent extraction performance. The results showed that the Van der Waals’ force was the main interaction between the thioether/mercaptan and the solvent because the peaks of solvent and sulfide by RDG analysis were located at −0.01 to 0.01 a.u. In addition, the dipole moment, steric hindrance, and displacement affected the solvent extraction performance. The selectivity coefficient θ ¯ of C3 thioether and mercaptan was 5.80 and 6.48 by DMSO solvent, respectively, which were greater than those of C4 sulfides (4.48 and 5.56). The interaction energy E int of DMSO-ethyl methyl sulfide and DMSO- propanethiol were −32.75 and −33.68 kJ/mol while DMSO-diethyl sulfide and DMSO- butanethiol were −24.72 and −29.20 kJ/mol. It also proves that the C3 thioether and mercaptan could better extract into the solvent. In this way, the extractive desulfurization rate of the real FCC naphtha by DMSO was 80%. Therefore, the use of sulfoxide composite solvent can simultaneously extract the thioether, mercaptan, and thiophenic sulfur. This analytical method could be used to predict the synchronous extraction performance for FCC naphtha sulfides by other typical solvents.
研究领域:
化学工程
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石油炼制
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2023
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IF 5.5
Yajing Huang,Dingren Ma,Jing Cao,Zhuoyun Tang,Lingling Hu,Yexing Zhang,Huinan Zhao,Dehua Xia,Chun He,Po Keung Wong
A simple hydrothermal method was applied to synthesize a 2D/2D g-C 3 N 4 /Bi 2 WO 6 (CN/BWO) composite photocatalyst for the photocatalytic removal of gaseous methyl mercaptan (CH 3 SH). The layered structure of CN/BWO and the C-O-Bi bonds at the interlayer interface were confirmed by thorough characterization techniques. The C-O-Bi bonds were demonstrated to reduce interlayer charge transfer resistance and inhibit photogenerated electron/hole pairs recombination. Therefore, 0.1-CN/BWO exhibited the highest photocatalytic efficiency for CH 3 SH removal, which was 1.4 times higher than 0.1-CN/BWONF with nanoflower structure, and 5.1 and 1.9 times higher than that of pure g-C 3 N 4 and Bi 2 WO 6 . The photocatalytic oxidation pathway and mechanism for CH 3 SH removal were revealed based on reactive species trapping, electron spin resonance (ESR), and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) tests. This work provides new insights into the design of photocatalysts with high photocatalytic performance and stability for the removal of volatile organic compounds (VOCs).
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yutong Zhao,Dingkai Chen,Jiangping Liu,Dedong He,Xiaohua Cao,Caiyun Han,Jichang Lu,Yongming Luo
Chromium (Cr) species with different loading (1, 2.5, 5, 7.5 and 10 wt%) were impregnated over alumina (Al 2 O 3 ) and silica (SiO 2 ) supports to investigate the effects of the metal-support interactions on decomposing methyl mercaptan. The characterization results revealed that the amount and nature of surface hydroxyl groups of support (Al-OH and Si-OH) induce the different interactions between chromium species and support, which generates an exceeding support-dependent dispersion, oxidation states, reducibility, and acid-base properties for the prepared Cr-based catalysts. As compared with SiO 2 support, Al 2 O 3 -supported chromium catalysts with evenly dispersed monochromatic Cr(VI) species exhibited excellent catalytic activity by means of theirs enhanced reducibility and sufficient acid-basic sites. Therefore, it is concluded that the metal-support interactions can be tailored by engineering the amount and nature of hydroxyl groups on the support.
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
危险品化学品经营许可证（带存储）