COMBUSTION AND FLAME
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2024
·
IF 5.8
Jiuzheng Yin,Xiaoli Zhang,Fangping Bin,Jinzeng Pan,Haikun Lang,Lidong Zhang,Lixia Wei
Olefins are important components in gasoline fuels as well as essential intermediates in the combustion of carbon-based fuels and oxy-fuels. Therefore, it is essential to investigate the oxidation chemistry of olefins, especially of long-chain olefins, to gain a deeper insight into the combustion of these fuels. 1-Decene is an important industrial chemical product and is often regarded as one of the representatives of long-chain olefins. This work investigated the low-temperature oxidation of 1-decene in a jet-stirred reactor with atmospheric pressure, temperature range of 700 – 900 K and equivalence ratio of 1.0. Twelve main oxidation species were detected and measured, by gas chromatography-mass spectrometry, including carbon dioxide, ethylene, ethane, acrolein, 1,3-butadiene, 1-butene, 1-pentene and benzene, etc. Based on previous reports, a detailed low-temperature oxidation kinetic model of 1-decene was developed and validated against the experimental data and literature data. In the model of 1-decene, the rate of production analysis revealed that the majority of 1-decene was consumed by H-abstractions to generate the primary radicals and OH-addition reaction onto C(1) to generate 1-decanol-2-yl radical. Sensitivity analyses show that H 2 O 2 (+ M) = OH + OH (+ M) was the most sensitive reaction to promote 1-decene consumption. The decomposition of hydrogen peroxide was the main source of the hydroxyl radical. Simulation results indicate that ignition delay time of 1-decene is higher than that of n -decane in the low-temperature at equivalence ratios of 0.5 – 2.0 and pressure of 20, 40 bar.
研究领域:
化学工程
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燃烧科学
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燃料化学
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产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Junjie Liu,Jianmin Wu,Qiwen Sun,Jiancheng Wang,Yan Sun
The high viscosity index poly-alpha-olefin was prepared by 1-decene polymerization under [EBIZrCl 2 /Al( i Bu) 3 /[Ph 3 C] + [B(C 6 F 5 ) 4 ] - system (EBI = rac-C 2 H 4 (1-Ind) 2 ), and its mechanism was investigated by in situ UV–Vis, 1 H NMR and ESI-MS. The results show that the kinematic viscosity at 100 °C (KV 100 ), viscosity index (VI) and yield of product reach to 336.3 cSt, 268 and 90.76 % under optimum reaction condition, wherein Zr/1-decene content, Al/Zr content, B/Zr content, reaction temperature and time are 10 −4 , 200, 2, 90 °C and 120 min, respectively. Meanwhile, temperature plays a crucial role in controlling the KV 100 and VI of product, with impact index of 55.43 % and 44.32 %, respectively. In situ UV–Vis, 1 H NMR, and ESI-MS analyses confirm the simultaneous generation of active (EBIZr-σ-polydecenyl cations) and inactive species (EBIZr-η 3 -(1-propyl-C 7 H 8 ) + ). The active and inactive species are generated through posing complexation to the terminal allyl of 1-decene and H 2 loss of EBIZr(u- i Bu) + , respectively. The second inactivate species (EBIZr-η 3 -(x-propyl-(3-x)-polydecenyl-C 3 H 3 ) + (x = 1 or 2)) can be activated by seizing isobutyl group in Al( i Bu) 3 . Subsequently, the polymer with an Al-capped saturated chain end is formed through chain migration. The polymerization process follows the reaction pathway: [1-decene]+[catalyst]→[active species]+[inactive species]. This is supported by the fact that all fitting curve of conversion versus time, 1-decene consumption and polymer generation conform to the Boltzmann (R 2 = 0.999). Based on those findings, a possible mechanism in ansa-zirconocene catalyzed polymerization of 1-decene is proposed.
研究领域:
高分子化学
·
催化化学
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DOI
高影响因子
CATALYSIS LETTERS
·
2023
·
IF 2.8
Shi Bingyu,Liu Man,Chen Jiangang
Derivatives of 2,4-dimethyldihydrocyclopentadiene were prepared, characterized by NMR spectroscopy, which was applied to 1-decene oligomerization. A two-step activation method in which both triisobutylaluminium (TIBA) and methyl aluminoxane (MAO) were co-used in sequence particularly been developed for N-doped ligand catalyst. N-doped catalyst had a very high polymerization conversion at 60–110 °C by varying the reaction temperature at 20 eq. of TIBA and 100 eq. of MAO, reaching 89.95% at 80 °C. In addition, oligomers with different viscosity grades could be obtained by adjusting the temperature. At optimized reaction conditions 75 °C, 10 eq. of TIBA and 50 eq. of MAO activation, the single pass conversion of 91.33% was achieved. The obtained oligomers had a high viscosity index above 170 at KV 100 = 6. In addition, the two-step activation method was used to compare with the conventional one-step activation method on catalysts with three different ligands of zirconium chloride. A high catalytic productivity was achieved by the two-step activation process. Depending on the nature of the ligands used, β-hydride elimination, 2,1 insertion and 1,2 rearrangement were detected as main chain release mechanisms. Meanwhile, the pathways of oligomer formation were also summarized. In brief, N-doped complex is promising catalysts for the production of high quality lubricant base oils due to their high catalytic activity and high thermal stability. Graphical Abstract
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2025
·
IF 21.3
Li Qianyi,Chen Liang,Yu Jie,Zhao Jingwen,Shi Nuo,Saiding Qimanguli,Du Yawei,Yao Wenfei,Lu Yiming,Wang Juan,Cui Wenguo
Neural cell senescence hinders spinal cord nerve function recovery, and existing therapies that target senescent cell clearance haven’t effectively addressed cellular senescence. In this study, injectable short fibers that accurately maintain genome homeostasis in real time were developed, which for the first time reversed neural cell senescence by blocking the excessive intervention of cell inspection points. First, the oxidization-sensitive hybrid liposomes were prepared by combining Bakuchiol (BAK), a natural plant extract with the ability of DNA protection, with the oxidization-sensitive phospholipid S-PC. Subsequently, the short fibers regulating the cell inspection points (ISN@n-BAK) were constructed by further complexing the oxidation-sensitive hybrid liposomes with short fibers through π – π conjugation and catechol groups mussel-stimulated polydopamine (PDA). In vitro experiments demonstrated that ISN@n-BAK promotes neural stem cell differentiation into neurons and has anti-aging effects across various aging stages. In vivo, ISN@n-BAK responded to excessive ROS by triggering oxidation-sensitive liposomes to release BAK, protecting against DNA damage, suppressing aging-related gene expression in Cdkn2a and Cdkn2c and inhibiting inspection point restrictions. Bioinformatics showed that ISN@n-BAK reversed neural cell senescence and aided spinal cord nerve regeneration by activating the endogenous cell cycle, downregulating the PI3K-Akt pathway and upregulating the Rap1 pathway. This study introduces a novel therapeutic approach using short fibers that inhibit inspection points intervention to rejuvenate injured spinal cords. Graphical
研究领域:
生物医学工程
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神经科学
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分子生物学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Xiaohong Wang,Jialian Li,Chen Chen,Xu Li,Lei Liu,Jinxiang Dong
Benzene sulfonate surfactants are crucial anionic surfactants, commonly derived from petrochemical sources. Herein, we present a new method for synthesizing alkyl-tetralin sulfonate anionic surfactants using α-olefins (n-hexene, n-octene, n-decene) and tetralin sourced from the coal chemical industry as raw materials. The three-resulting alkyl-tetralin sulfonates (C6-THNS, C8-THNS and C10-THNS), obtained by alkylation and sulfonation of tetralin were characterized through HPLC, FTIR, LCMS and 1 H NMR techniques. Their surfactant properties were also investigated and compared with commercially applied linear alkylbenzene sulfonate (LAS). We observed that C6 alkyl-tetralin sulfonate (C6-THNS) exhibited smaller critical micelle concentration ( CMC =0.60 mM) and lower equilibrium surface tension ( γ CMC =33.43 mN/m). Similarly, C6-THNS also showed comparable foaming, wetting and emulsifying properties with LAS, which can be used as a substitute for LAS surfactants. This study shows that the synthesized alkyl-tetralin sulfonates is a potential surfactant, providing a route for efficiently using coal-based chemicals to synthesize surfactants.
研究领域:
化学工程
·
表面活性剂合成
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产品关联
DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 5
·
IF 3.7
Jiazhen Qiu,Xin Tian,Kaihua Li,Jiangqi Zhao,Shiqing Tian,Jinsong Liu,Xin Yang,Jun Li,Ying Liu
The purity of titanium sponge is crucial for determining the performance of final titanium alloys, underscoring the importance of impurity control in its precursor, TiCl4. Among these impurities, VOCl3is particularly challenging to remove due to its similar boiling point and complete miscibility with TiCl4. Although organic reagents are widely employed for vanadium removal, their complex compositions complicate the identification of key active components. This study systematically compares the vanadium removal efficiency of six organic compounds bearing different functional groups. Results demonstrate that 1-dodecene exhibits superior performance, achieving a VOCl3removal efficiency of 93.35%. Mechanistic studies reveal that 1-dodecene initially undergoes cyclization to form cyclododecane, followed by aromatization and subsequent carbonization through stacking, dehydrogenation, and coking, ultimately yielding partially graphitized amorphous carbon. In this process, VOCl3interacts not only with the incompletely carbonized organic precursor but also directly with the alkenes. These findings elucidate the reaction pathway and central role of linear α-alkenes in vanadium removal, providing a theoretical foundation for developing efficient and stable vanadium removal agents.
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 9
·2638-2646
·
IF 3.186
Li Xiao,Qin Tingting,Li Liusha,Wu Bo,Lin Tiejun,Zhong Liangshu
Abstract A green route for one−pot synthesis of acetals by tandem hydroformylation−acetalization of olefins using supported Rh−based catalysts was developed. Experimental results demonstrated that suitable Rh loading (1 wt%) with appropriate reaction temperature (120 °C) and reaction time (8 h) were favorable for the formation of acetals, and a high acetals selectivity of 94.6% was achieved. More importantly, the selectivity to valuable linear products was enhanced in this tandem catalysis. Based on the catalytic mechanism study, highly dispersed RhO x nanoparticles and abundant acid sites on the supports were responsible for the hydroformylation and acetalization, respectively. Graphical abstract One-pot synthesis of acetals directly from olefins with high selectivity was achieved over heterogeneous bifunctional catalysts via tandem hydroformylation-acetalization.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Xiao Li,Liusha Li,Tingting Qin,Gong Gun,Tiejun Lin,Liangshu Zhong
Tandem hydroaminomethylation is an efficient and green route for one-pot synthesis of amines directly from olefins. Herein, heterogeneous hydroxyapatite (HAP) supported single-atom Rh catalyst was prepared and used for tandem hydroaminomethylation of olefins. Characterization techniques confirmed the atomic dispersion of Rh species on HAP. Up to 99% conversion of 1-hexene with high selectivity to the desired amines (93.2%) was obtained over 0.5Rh 1 /HAP catalyst. Mechanism study demonstrated that the first hydroformylation step during the tandem catalytic process was rate-determining. Compared with the Rh nanoparticles on other oxide supports (Mg 3 Al, MgO and Al 2 O 3 ), the atomically dispersed Rh sites on HAP ensured the high hydroformylation activity, thereby guaranteed the outstanding catalytic performance for the total tandem process. Furthermore, various corresponding amines can be obtained with satisfactory yields over 0.5Rh 1 /HAP catalyst from a wide scope of olefins or amines substrates.
研究领域:
催化化学
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材料科学
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绿色化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Lei Tang,Zhixiang Zeng,Gang Wang,Luli Shen,Lijing Zhu,Yingxin Zhang,Qunji Xue
The superhydrophilic self-cleaning surface can perfectly deal with oil pollution, which cannot be realized by the superhydrophobic surface. This research is designed to study the mechanism of wetting behavior of superhydrophilic coating with different function groups and guide to design a stable self-cleaning surface. We prepare several hydrophilic coatings including nonionic, ionic, and zwitterionic coatings to investigate their self-cleaning performance underwater when they have been polluted by oil in the dry state. The chemical composition, surface roughness, static and dynamic wettability, underwater oil adhesive force, and swelling degree of the coatings are studied to explore their oil dewetting mechanism. The results indicate that the wettability of the coating to water and oil is the key factor to determine the self-cleaning performance. The smooth 3-sulfopropyl methacrylate potassium salt (SA) anionic coating shows the best self-cleaning performance even when polluted by heavy crude oil in the dry state in air. It is also found that in the dry state, the rough hydrophilic anionic surface will lock up the oil in the structures and then lose its self-cleaning ability underwater, whereas the oil droplet can detach from the smooth coating surface quickly. Meanwhile, the superhydrophilic and underwater superoleophobic SA anionic surfaces also exhibit excellent anti-fogging and oil–water separation performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 6
·1651-1659
·
IF 2.372
Bao Jingxian,Fan Yonghui,Zhang Shuyi,Zhong Liangshu,Wu Minghong,Sun Yuhan
Abstract An atomically economical green protocol for the hydrofunctionalization of olefins to higher aliphatic alcohols with 100% anti-Markovnikov regioselectivity was developed via visible-light photocatalytic coupling. This method employs cheap, readily available and abundant methanol as both the C1 feedstock and the hydrogen source under visible light irradiation over CdS photocatalyst. A wide scope of olefin substrates could be hydrofunctionalized successfully to the corresponding higher alcohols with high selectivity. Besides alcohol, acetone and acetonitrile can also couple with olefins to generate the corresponding hydrofunctionalization products, suggesting promising potential industrial application. Graphical Abstract Hydrofunctionalization of olefins to value-added chemicals with high selectivity was achieved via visible-light photocatalytic cross-coupling.
研究领域:
化学
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绿色化学
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光催化
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 27
·11968-11976
·
IF 3.591
Xingyu Yang,Xu Li,Jinxiang Dong
The epoxidation of linear-chain α-olefins over heterogeneous catalysts is still challenging, while epoxides as versatile raw intermediates are highly desirable. Here, we describe the facile preparation of farringtonite, obtained via the calcination of commercial anhydrous trimagnesium phosphate, and its novel application in the epoxidation of olefins. Farringtonite was characterized via XRD, FT-IR, SEM-EDS, and CO2-TPD studies. The CO2-TPD data exhibited that farringtonite mainly possesses medium-base sites. The catalytic activity of farringtonite was optimized via adjusting different parameters, including the solvent, temperature, amount of H2O2, farringtonite loading, stirring rate, and so on, using 1-octene epoxidation as the model reaction and 30% H2O2 as the oxidant. The results from 1-octene epoxidation indicated that the farringtonite catalyst exhibited efficient catalytic activity, with high conversion of up to 85.2% and epoxide selectivity of 87.6% under the optimal conditions. In addition to 1-octene, 1-decene and 1-heptene were also used, achieving good-to-excellent conversions with high selectivities. In addition, farringtonite could be recycled four times with the preservation of its high catalytic activity. From a mechanistic standpoint, the in situ generation and consumption of Payne's reagent is responsible for the epoxidation reaction. Therefore, farringtonite serves as an excellent catalyst for the epoxidation of α-olefins.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 21
·12518-12523
·
IF 3.108
Pengfei Zhou,Xuping Wang,Bo Yang,Frank Hollmann,Yonghua Wang
Epoxides are important synthetic intermediates for the synthesis of a broad range of industrial products. This study presents a promising solution to the current limitation of enzyme instability. By using simple deep eutectic solvents such as choline chloride/sorbitol, significant stabilization of the biocatalyst has been achieved leading to more robust reactions while using environmentally more acceptable solvents as compared to ionic liquids.
研究领域:
生物化学
·
绿色化学
✓ 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）