APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 3
·e70040
·
IF 0
Jun Liu,Xinyu Wang,Ting Ouyang,Huilin Lan,Ying Bai,Jiayun Li,Yichen Huang,Jiajian Peng
Phosphate and pyrophosphate can advance green chemistry as nontoxic and sustainable catalysts. This study presents the development of a novel series of solid composite catalysts, comprising AlCl 3 and alkaline-earth metal (pyro)phosphates. The efficacy of these catalysts in facilitating the hydrosilylation of olefins with hydrosilanes has been thoroughly examined. Adding aluminum chloride enhances the catalytic activity of calcium phosphate for the catalysis hydrosilylation reaction, enabling efficient conversion of various linear alkenes into corresponding adducts with excellent yields. Furthermore, this catalytic system exhibits remarkable stability, maintaining its activity over 15 cycles without significant decrease.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Shaoping Ma,Changyong Cai,Xuhong Guo,Zhijian Tan
Membranes have been used as versatile tools for the separation of various natural products; however, the selective separation of structural analogs of natural products using membranes remains challenging. In this study, biocomposite membranes based on poly(ionic liquids) and different natural fibers (jute, cotton, or wool) were successfully prepared. Natural fibers can regulate the microstructure and improve the mechanical properties of membranes. Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, atomic force microscopy, Brunauer-Emmett-Teller analysis, and thermo gravimetric analysis were used to characterize the membranes. The membranes were used to separate tanshinone homologs (tanshinone I, tanshinone IIA, cryptotanshinone, and dihydrotanshinone I), allowing cryptotanshinone to penetrate the membrane while rejecting tanshinone I. A maximal selectivity of 44.57 % was obtained for the tanshinone homologs using a one-step separation protocol. These poly(ionic liquids)/natural fiber membranes possess high water flux, good self-cleaning, and good antibacterial properties. The membranes were effective in separating tanshinone homologs and have the potential to separate other natural homologs.
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PubMed
高影响因子
Polymers
·
2025
·Vol. 18
·期 1
·64
·
IF 4.9
Ruijun Zhang,Ziyi Dong,Qiqi He,Junhua Li,Yuexin Hu,Jianhua Qian
Accurate knowledge of phase behavior in polyolefin–solvent mixtures is critical for ensuring stable operation and safe scale-up of industrial solution polymerization processes. The binary (n-hexane + ethylene/1-octene copolymer, POE96k-10) and ternary (α-olefin +n-hexane + POE96k-10) phase behaviors were investigated via a visual high-pressure cell (POE96k-10:Mw= 96 kg·mol–1,Mw/Mn= 3.87, 1-octene mole fraction = 10.31 mol%) at temperatures of 380~480 K and pressures as high as 14 MPa. To systematically analyze the effects of α-olefin mass fraction and type on phase transition, four industrially relevant α-olefins (ethylene, 1-butene, 1-hexene, and 1-octene) were investigated. The results show that the phase transition temperature and pressure for liquid–liquid and liquid–vapor transitions show an approximately linear dependence on α-olefin mass fraction. Ethylene, 1-butene, and 1-hexene lower the phase transition temperature, whereas 1-octene increases it. Ethylene exhibits a strong anti-solvent effect, significantly lowering the transition temperature while increasing the phase transition pressure. The modified Sanchez-Lacombe equation of state (MSL EOS) effectively correlates and reproduces the phase equilibrium data of the α-olefin +n-hexane + POE96k-10 ternary systems, though its accuracy decreases with increasing α-olefin chain length.
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TENSIDE SURFACTANTS DETERGENTS
·
2025
·
IF 1.2
Xuejiao Song,Zexiang Bi,Zimeng Wei,Xu Li,Jinxiang Dong
The branching of the hydrophobic tail has a significant impact on the performance of branched-chain surfactants, while the influence of hydrophilic headgroups on the surface properties of branched-chain anionic surfactants is rarely reported. In this work, three branched-chain anionic surfactants with the same carbon number and hydrophobic tail architecture but different hydrophilic groups, C 8 sodium branched-chain alkylsulfonate (C 8 SBCAS), C 8 sodium branched-chain alkylphosphonate (C 8 SBCAP), C 8 sodium Guerbet alcohol sulfate (C 8 SGAS) with sulfonate, phosphonate and sulfate groups, respectively, were synthesized. Their surfactant properties, including equilibrium surface tension, dynamic surface tension, wetting ability and foaming property, were thoroughly investigated. The order of the critical micelle concentration ( CMC ) is C 8 SGAS < C 8 SBCAP < C 8 SBCAS, and the equilibrium surface tension ( γ CMC ) follows the order C 8 SBCAP < C 8 SBCAS < C 8 SGAS. These results indicated that increasing the polarity of the hydrophilic headgroups and weakening the charge effect could reduce the hydrophobicity of surfactants, thereby improving their wetting ability and foaming properties. This study provides new insights into the influence of hydrophilic headgroups on the properties of branched-chain anionic surfactants to meet the specific needs of different sectors.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xinyu Wang,Luoqi Liu,Weihong Huang,Ying Bai,Jiayun Li,Jiajian Peng
Dehydroacetic acid [3-acetyl-4-hydroxy-6-methyl-2H-pyran-2-one, DHA] can provide O,O′-bidentate coordination sites, and the conjugated π system (CC–CO) in the dehydroacetic acid molecules can effectively stabilize the electronic state of the metal center. This characteristic makes dehydroacetic acid an important ligand in the fields of coordination chemistry and catalysis. A series of cobalt(II)-dehydroacetic acid complexes have been successfully prepared and utilized insoluble cobalt salts to support dehydroacetic acid, creating self-supported catalysts. These two types of catalysts can efficiently catalyze the hydrosilylation reaction of various olefins under mild conditions. Compared to traditional catalysts, these two types of catalysts not only exhibit significantly enhanced catalytic activity but also show superior selectivity for the reaction products.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Feng Wang,Shouhui Jiao,Xiaoqi Zhang,Ying Yang,Xiaohan Jin,He Liu,Zongxian Wang,Aijun Guo
Although highly reactive olefinic species are abundant in thermally cracked oil, previous studies have predominantly focused on the macroscopic fouling effects of aliphatic olefins during transportation/storage. In contrast, the molecular-level mechanisms by which aromatic olefins promote coking during thermal conversion remained unclear. This work systematically investigated how aromatic olefins drive molecular growth and coke formation of heavy aromatic fractions. Thermal conversion experiments with vacuum residue (VR), resins (Re), and asphaltenes (Asp) mixed with olefin model compounds revealed that aromatic olefins accelerated coking compared to aliphatic olefins, with the coking-promoting effect intensifying as the number of aromatic rings in the molecule increased. At 410°C for 60 min, the addition of 5 wt% 9-vinylanthracene to VR increased the coke yield from 1.35 wt% to 5.72 wt%, versus 1.68 wt% with the addition of 5 wt% 1-octene. Similarly, the addition of 5 wt% 9-vinylanthracene elevated the coke yields for Re and Asp systems from 0.66 wt% and 41.28 wt% to 5.13 wt% and 50.84 wt%, respectively, compared to 1.08 wt% (Re) and 43.36 wt% (Asp) observed with the addition of 1-octene. Model compound system studies demonstrated that, aromatic olefins, unlike 1-octene, could further react with primary addition products formed by their initial co-addition with conventional aromatics, leading to the formation of secondary and high-order addition products. Notably, aromatic olefins exhibited increasing reactivity in continuous co-addition reactions as the number of aromatic rings increased. This was supported by 42.2 % high-order addition products detected in the toluene/9-vinylanthracene system versus 30.1 % in the toluene/styrene system. This study elucidated that aromatic olefin promoted molecular growth through continuous co-addition reactions, ultimately triggering phase separation and coke formation. The findings provided molecular-level insights into the adverse impacts of aromatic olefins on industrial processing of thermally cracked oil.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Keqin Liu,Wangen Liang,Jianlin Zhang,Jijiang Hu,Weihua Cui,Zhen Yao
Pseudoliving ring-opening metathesis polymerization (ROMP) was conducted using an industrial catalyst system WCl6/alkyl aluminum/alcohol via a semicontinuous strategy. The classical mechanism of living ROMP fails to fully account for the observed living characteristics in this polymerization. However, the incorporation of an intermolecular chain transfer successfully resolves these contradictions. As the chain transfer agent is consumed, active centers are able to randomly activate all polymer chains via intermolecular chain transfer and undergo propagation, thereby achieving pseudoliving polymerization. In sequential copolymerization, diffusion ordered spectroscopy demonstrated the transition from homopolymers to copolymers, proving the existence of intermolecular chain transfer. Additionally, 13C NMR spectra of copolymers produced by different polymerization strategies further revealed that sequential polymerization yielded copolymers with a multiblock structure. MATLAB simulations demonstrated that the dispersity of polymers being less than 2 was a result of the similar intermolecular chain transfer probabilities of dead polymers with different polymerization degrees.
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高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Li Huang,Jia Wang,Qi Liu,Peng Sun,Mengnan Nie,Guang Gao,Zelun Zhao,Zhiwei Huang,Fuwei Li
Olefin hydroformylation is one of the most important industrial processes for aldehyde synthesis. Heterogeneous catalysts are easy to separate compared with homogeneous catalysts, yet with limited success in activity and regioselectivity control. In the present work, a zeolite-encapsulated rhodium carbide species (RhC x @S-1) catalyst was developed, demonstrating not only relatively high catalytic activity but also good regioselectivity and stability in heterogeneous hydroformylation. The unique microenvironment of rhodium carbide species was formed in situ during the catalyst carbonization reduction process, tuning the steric and electronic characteristics of Rh species to obtain more linear aldehydes. This work shows an alternative strategy to promote the regioselectivity of olefin hydroformylation catalyzed by zeolite-confined catalysts and provides insights into the selective regulation of heterogeneous catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuqing Wang,Miao Jiang,Na Liu,Tian Tian,Changdao Li,Zhao Sun,Gewen Yu,Yanming Wang,Wenxiu He,Jian Ding,Li Yan,Yunjie Ding
Designing low-cost and highly efficient heterogeneous catalysts for olefin hydroformylation, particularly utilizing abundant internal olefins, represents a research area of considerable scientific and industrial significance. Herein, a series of N or P doped porous organic polymers (POPs-N&P) are designed and fabricated to serve as carriers by the solvothermal polymerization of vinyl functionalized amine-type N, pyridinic N, imidazole N and PPh 3 ligands. The microenvironments surrounding cobalt were effectively regulated in Co/POPs-N&P catalysts. Specifically, single atom Co/POPs-NPh 3 catalyst with amine-type N chemical configurations possesses superior olefins isomerization abilities, thereby presenting an excellent 2-octene conversion of 95.9 % with the oxygenates selectivity of 62.6 % and a turnover number of 561, outperforming most of heterogeneous cobalt-based catalysts reported to date. Experimental results verify that distinct electronic environment of Co sites lead to different olefins isomerization abilities. Abundant Co N active species are generated on the Co/POPs-NPh 3 catalyst, which are different with those active species produced on the Co/POPs-PPh 3 , Co/POPs-Im&DVB and Co/POPs-Py&DVB catalysts. Furthermore, a reaction mechanism was also suggested for 2-octene hydroformylation over the Co/POPs-NPh 3 catalyst. This work underlines the potential of POPs as an ideal platform for the modulation of the coordination environment of the Co sites toward improved hydroformylation of internal alkenes.
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 18
·3704
·
IF 4.6
Jing Zhou,Qiqi Zhang,Mengying Wang,Zongmu Xiao,Yixin Zhang
The design and development of low-cost and efficient nonhomogeneous catalysts for silicon hydrogen addition is a hot research topic. This study reports the synthesis of a novel solid catalyst, PtCu-NVF-HBNC, derived from hazelnut shell biomass waste. The catalyst was prepared through carbonisation, nitrogen-doped activation, functionalisation with N-vinylformamide (NVF), and subsequent bimetallic Pt–Cu loading. It features a divalent platinum–vinylamine complex as the active centre. The introduction of Cu as a promoter induces competitive coordination with the Pt(II)–vinylamine complex, leading to electron density redistribution on the vinylamine ligand and a significant enhancement in Pt(II) coordination bond strength. This electronic modulation results in markedly improved activity and regioselectivity in the hydrosilylation of alkenes with tertiary silanes. The optimised catalyst, Pt1.6Cu-NVF-HBNC, demonstrated high performance in the hydrosilylation of linear alkenes, including 1-hexene, 1-octene, and 1-octadecene with triethoxysilane, indicating broad substrate adaptability.
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高影响因子
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