CHEMICAL ENGINEERING SCIENCE
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2026
·
IF 4.3
Haodong Chen,Qi Ping,Zhen Zhang,Zhe An,Jian Zhang,Xin Shu,Yanru Zhu,Jing He
Supported metals are well-recognized commercial catalysts for important industrial selective hydrogenation. Intrinsic catalysis based on structure–function relationship has traditionally been regarded as a main factor to determine hydrogenation selectivity, while the intense heat release in a strong exothermic reaction also inevitably deteriorates the selectivity by causing coke deposition and/or over-hydrogenation. Herein, this work demonstrates a distribution effect by homogeneously dispersing catalytically-active metal particles on oxide support to enhance the selectivity of exothermic hydrogenation. The catalytically-active metal particles with varied dispersion homogeneity, NiCu here, exhibit similar intrinsic catalysis in the intensely exothermic hydrogenation of α-methylstyrene to cumene. However, a distribution effect is found that the increase in metal dispersion homogeneity leads to enhanced cumene selectivity while decreased isopropylcyclohexane (IPCH) selectivity, with a cumene selectivity of > 99 % achieved at a α-methylstyrene conversion of > 99 %. The high selectivity is attributed to the in-situ thermal dissipation caused decrease in temperature increment detected at the catalyst bed, while even a slight temperature increase at catalyst bed could be induced by a large temperature rise at catalytic sites. Benefiting from the lowered temperature increment, the over-hydrogenation to IPCH with a higher activation energy has been inhibited.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiang Chen,Chenxi Hu,Yang Wang,Ting Li,Jie Jiang,Jing Huang,Shibo Wang,Tianxi Liu,Weifu Dong,Jinliang Qiao
Clusteroluminescence (CL) has drawn much attention in recent years. However, the design of red emission clusteroluminogens (CLgens) with tunable CL is still in its infancy. Herein, we report a simple heating process to prepare red emission poly(maleic anhydride-alt-vinyl acetate) (PMV) derivatives with a tunable maximum emission wavelength between 620 and 675 nm. First, heating above the glass transition temperature (Tg) would promote the movement of polymer chains and facilitate the formation of clusters in both solid and solution states. Then, heating beyond the decomposition temperature at which vinyl acetate converts into C═C is favorable to the formation of new clusters and large through-space conjugation among subgroups in polymer chains. Their synergistic effects realize the adjustable emission wavelength and higher quantum yield of polymers. Additionally, low-cost and eco-friendly core–shell PMV particles are prepared as agricultural light conversion agents and exhibit great compatibility with polyethylene.
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JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.3
Ning Li,Xiaoyu Zhang,Yuxi Zhang,Guorui Wang,Ruotong Wang,Chi Zhang,Fanglei Zeng,Hailong Liu,Gang Yi,Zhongwei Wang
In order to improve the poor hydrophobicity and single repair conditions of traditional self-healing polyurethane coatings, prepolymers were synthesized with bio-based polyol castor oil (CO), self-made alkyl aryl modified silicone polyols (Si-OH) and isophorone diisocyanate (IPDI), and 4,4'-dithiodianiline (ODD) was used as chain extender containing dynamic disulfide bond, 4-methylumbelliferone (4-MU), as a bio-based end capping agent with reversible ring structure, was polymerized step by step to prepare a photothermal responsive bio-based superhydrophobic self-healing poly(siloxane-urethane) coating (PUSi). In this paper, the effect of the amount of alkyl aryl modified silicone polyol (Si-OH) on the properties of PUSi was studied. The results showed that PUSi with different alkyl aryl modified silicone polyol additions could achieve self-healing under heating, UV irradiation and infrared light irradiation, and the maximum repair efficiency could reach 91% through optical microscope (OM), 3D profilometer and universal testing machine; The contact angle meter proved that the introduction of alkyl aryl modified silicone polyol greatly improved the hydrophobicity of PUSi, and the maximum water contact angle was 162°. The coating has broad application prospects in the fields of self-cleaning fabrics, super hydrophobic surfaces, special protective clothing and so on.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Liu Yifeng,Liu Zhiqiang,Hui Yu,Wang Liang,Zhang Jian,Yi Xianfeng,Chen Wei,Wang Chengtao,Wang Hai,Qin Yucai,Song Lijuan,Zheng Anmin,Xiao Feng-Shou
Hydroformylation is one of the largest industrially homogeneous processes that strongly relies on catalysts with phosphine ligands such as the Wilkinson’s catalyst (triphenylphosphine coordinated Rh). Heterogeneous catalysts for olefin hydroformylation are highly desired but suffer from poor activity compared with homogeneous catalysts. Herein, we demonstrate that rhodium nanoparticles supported on siliceous MFI zeolite with abundant silanol nests are very active for hydroformylation, giving a turnover frequency as high as ~50,000 h −1 that even outperforms the classical Wilkinson’s catalyst. Mechanism study reveals that the siliceous zeolite with silanol nests could efficiently enrich olefin molecules to adjacent rhodium nanoparticles, enhancing the hydroformylation reaction.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 44
·e54628
·
IF 3
Xiaoyu Zhang,Yuqing Zhang,Peiyao Li,Ruotong Wang,Binghao Ma,Fanglei Zeng,Qitu Zhang,Hongyan Dai,Ning Li
In order to improve the problems of traditional self-healing polyurethane coating, such as harsh curing and repair conditions, poor hydrophobicity, thermal stability and human affinity, the prepolymer was synthesized by bio-based polyol castor oil (CO), self-made alkyl aryl modified silicone polyol (Si OH) and isophorone diisocyanate (IPDI), and dimethylglyoxime (DOU) was used as chain extender containing dynamic imine bond, methacrylic acid 2-(tert-butylamino)ethyl ester (MABE) was used as a capping agent containing acrylate and high steric hindrance amino structure, and a UV curable room temperature repair bio-based poly(siloxane-urethane) coating (PUESi) was prepared by stepwise polymerization. In this article, the effect of the amount of DOU on the properties of PUESi was studied. The results showed that PUESi with different dosages of DOU could achieve self-healing at room temperature. The maximum repair efficiency of full cut could reach 91.8%, and the scratch repair efficiency could reach 99.3%; The contact angle meter and synchronous thermal analyzer proved that the introduction of Si OH significantly improved the hydrophobicity, oil repellency and thermal stability of PUESi. The water contact angle increased from 78° to 104°, the oil contact angle increased from 63° to 91°, and the 5% thermal decomposition temperature increased from 179 to 196°C. The coating has broad application prospects in the fields such as antifouling and anticorrosion, building material protection, and automotive instruments.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2021
·
IF 2.369
Yingpeng Huo,Jiwen Hu,Yuanyuan Tu,Zhenzhu Huang,Shudong Lin,Xiaojiong Luo,Chao Feng
Reported herein is a magnetically separable heterogeneous nano catalyst Fe 3 O 4 @SiO 2 -biIMI- PtCl 2 , which is prepared by firstly applying a SiO 2 coating onto readily synthesized magnetite nanoparticles via the hydrolysis condensation of tetraethyl orthosilicate (TEOS) under basic conditions, then modifying it using aminopropyl triethoxysilane and bis(imidazole) aldehyde, and finally incorporating a PtCl 2 complex via coordination chemistry. The chemical structure and morphology of the nanocatalyst as well as the valence state and content of platinum within this catalyst were carefully characterized. This catalyst can mediate the hydrosilylation between 1-octene and hydrosilane, with the conversion of 1-octene reaching up to 99%, and it shows good regioselectivity as only β-adducts are identified. In addition, this catalyst can be reused for at least 5 cycles. The hydrosilylation reaction between different olefins and hydrosilanes can also be efficiently mediated by Fe 3 O 4 @SiO 2 -biIMI-PtCl 2 .
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 8
·e5697
·
IF 3.14
Yingpeng Huo,Jiwen Hu,Yuanyuan Tu,Zhenzhu Huang,Shudong Lin,Yangfei Hu,Chao Feng
An imidazolyl Schiff base-containing periodic mesoporous organosilica (PMO) was synthesized via co-condensation reactions between a newly prepared bis (imidazolyl)imine-bridged bis silane and tetraethyl orthosilicate in the presence of cetyltrimethyl ammonium bromide as a soft template. The resultant as-synthesized PMO was then employed as a solid support for platinum catalysts. This complex was fully characterized via various techniques including FTIR, solid-state 13 C NMR, and 29 Si-NMR spectroscopy, as well as N 2 adsorption/desorption analysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) methods. In addition, the catalyst was proven to efficiently mediate hydrosilylation reactions between olefins and hydrosilanes, and it can be reused for at least five cycles without significant loss of activity.
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JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
·
2021
·
IF 3.33
BY Hou,L Ren,YN Sun,MY Zhang,HX Zhang
This work proposed an efficient method to synthesize acrylonitrile-butadiene-styrene (ABS) copolymer and α-Methylstyrene (α-MSt)/N-phenylmaleimide (NPMI)/Acrylonitrile (AN) (MSAMI) random copolymer via emulsion polymerization, aiming to combine the excellent heat resistance of MSAMI and numerous advantages of ABS resin including mechanical properties, processing and recyclability. The effects of the MSAMI content and α-MSt/AN ratio on the thermal performance, mechanical properties and the morphology of heat-resistant ABS were investigated by FITR, dynamic mechanical analyses (DMA), Vicat Softening Temperature (VST), Thermogravimetric Analysis (TGA) and Scanning Electron Microscope (SEM). As a result, the heat-resistant of ABS resin was obviously enhanced by MSAMI, and its glass transition temperature (Tg) could be extended with the increase of NPMI content. The Tg could reach 173°C when NPMI content was 20% at the same trend as the VST. Synthetically, the contradiction between the heat resistance and mechanical properties of ABS resin reached a good balance when the NPMI content was 15% and α-MSt/AN ratio was 69/31. In SEM, the fracture morphology of the heat-resistant ABS resin was gradually tended to be smooth with the increase of the NPMI content. Therefore, the MSAMI random copolymer was successful prepared, which provided insight for the synthesis of heat-resistant modifiers and promoted the potential application of heat-resistant modifiers in automobiles and aircraft.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 6
·e4874
·
IF 3.259
Yingpeng Huo,Jiwen Hu,Shudong Lin,Xingming Ju,Yanlong Wei,Zhenzhu Huang,Yangfei Hu,Yuanyuan Tu
Reported herein is an easy-to-prepare novel heterogeneous catalyst of platinum complexes bearing binary ligands of bidentate naphthalenolimine and cyclo-1,5-octadiene that are anchored onto mesoporous silica SBA-15. The presence of the binary ligands not only stabilized the platinum, but also enabled the platinum atoms to form nanoclusters with diameters of ca 1 nm, and led to high platinum loading (8.69 wt%). Moreover, the platinum catalyst exhibited high catalytic activity towards hydrosilylation of terminal alkenes and styrene with silanes under mild and solvent-free conditions, with excellent regioselectivity.
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BIOMACROMOLECULES
·
2014
·
IF 5.788
Xin Yang,Kan Hu,Guantai Hu,Danyao Shi,Yunjiang Jiang,Liwei Hui,Rui Zhu,Yuntao Xie,Lihua Yang
We show that simply converting the hydrophobic moiety of an antimicrobial peptide (AMP) or synthetic mimic of AMPs (SMAMP) into a hydrophilic one could be a different pathway toward membrane-active antimicrobials preferentially acting against bacteria over host cells. Our biostatistical analysis on natural AMPs indicated that shorter AMPs tend to be more hydrophobic, and the hydrophilic-and-cationic mutants of a long AMP experimentally demonstrated certain membrane activity against bacteria. To isolate the effects of antimicrobials’ hydrophobicity and systematically examine whether hydrophilic-and-cationic mutants could inherit the membrane activity of their parent AMPs/SMAMPs, we constructed a minimal prototypical system based on methacrylate-based polymer SMAMPs and compared the antibacterial membrane activity and hemolytic toxicity of analogues with and without the hydrophobic moiety. Antibacterial assays showed that the hydrophobic moiety of polymer SMAMPs consistently promoted the antibacterial activity but diminished in effectiveness for long polymers, and the resultant long hydrophilic-and-cationic polymers were also membrane active against bacteria. What distinguished these long mutants from their parent SMAMPs were their drastically reduced hemolytic toxicities and, as a result, strikingly enhanced selectivity. Similar toxicity reduction was observed with the hydrophilic-and-cationic mutants of long AMPs. Taken together, our results suggest that long hydrophilic-and-cationic polymers could offer preferential membrane activity against bacteria over host cells, which may have implications in future antimicrobial development.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Qingshan Zhao,Chan Bai,Wenfeng Zhang,Yang Li,Guoliang Zhang,Fengbao Zhang,Xiaobin Fan
Immobilization of metal complexes on solid supports is an efficient approach to remedy the drawbacks of homogeneous catalysis. In this study, an in situ strategy of synthesis and immobilization of a copper (salen) complex onto graphene oxide (GO) support has been developed. To provide the salen ligands, GO was covalently modified with an aminosilane, followed by condensation with salicylaldehyde. The copper (salen) complex was subsequently synthesized and simultaneously immobilized onto the GO surface with a designed tetrahedral chelate structure. The immobilized copper (salen) complex [Cu(salen)–f–GO] kept the two-dimensional sheetlike character of GO and was demonstrated to be highly effective for the epoxidation of olefins. It could be readily reused for successive twelve times without discernible activity and selectivity deterioration, which displays potential for practical applications.
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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.
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危险品化学品经营许可证（带存储）