INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yuan Cai,Xiaofeng Xu,Hu Wang,Lei Wang,Lulu Chen,Rui Li,Jing Ding,Hui Wan,Guofeng Guan
Production of alternative, clean aviation fuel from biomass synthesis gas via Fischer–Tropsch (FT) synthesis has attracted much attention. In this paper, Al-SBA-15 supported cobalt catalysts with different Al/Si ratios were successfully prepared for the production of aviation fuel by FT synthesis. The physical and acidic properties of the Co/Al-SBA-15 catalysts were characterized by XRF, XRD, N2 adsorption–desorption, TEM, H2-TPR, 27Al NMR, NH3-TPD, and Py-FTIR. The formation of long-chain hydrocarbons was inhibited by the ordered mesoporous structure. Fischer–Tropsch activity and selectivity were demonstrated to be affected by the acidity of the Al-SBA-15 supports. The selectivity turned to lighter iso-paraffin products. Co-based catalyst with Al/Si ratio of 0.01 exhibited the highest selectivity (52.4%) for aviation fuel (C8–C18 products) and much higher ratio of iso-paraffin/normal-paraffin (iso/n) (20.2%). This study might provide useful information for the selective production of aviation fuel via FT synthesis.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 23
·期 2
·529-537
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IF 1.108
Ma Beibei,Zhuang Linzhou,Chen Shuixia
The well-ordered hexagonal short-pore SBA-15 (SSBA-15) has been successfully synthesized via an energy-efficient process under the microwave-hydrothermal condition, in which the formation duration [stirring duration (ripening step) and microwave-hydrothermal treatment duration (aging step)] has been greatly decreased from 48 h for conventional hydrothermal treatment to <2 h. The extension of the ripening duration led to the evidently improved uniformity and regularity of particles while the increase of aging duration resulted in less intrawall pores and more structural mesopores. The optimal condition to get highly ordered SSBA-15 in this work was the duration of 2 h for both steps, and the SSBA-15 obtained was composed of cuboid-like particles, whose pore length was ca. 450 ± 50 nm and pore size was around 10 nm. The SSBA-15 was modified with different amine agents to prepare solid amine adsorbent, the obtained adsorbents showed considerable CO 2 adsorption ability, indicating that this fast-prepared SSBA-15 can be a promising support of CO 2 adsorbents.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 110
·90904-90912
·
IF 3.84
Yueling Cao,Junwei Wang,Maoqing Kang,Yulei Zhu
Hydrogenolysis of glucose and cellobiose, used as the model feedstocks, over Ni–WO3/SBA-15 catalysts has been investigated to probe the influencing factors for the conversion of cellulose to ethylene glycol (EG). The conversion of glucose and cellobiose to EG showed different dependencies on reaction temperature; a lower reaction temperature was needed for the former. Additionally, the surface atomic ratio of W to Ni on the Ni–WO3/SBA-15 catalysts was the key factor for the product distribution. Both glucose and cellobiose had their own optimum W–Ni ratio for the production of EG, and the ratio of W to Ni for glucose was slightly lower than that of cellobiose. On the other hand, the Ni–WO3/SBA-15 catalysts were thoroughly characterized by N2 adsorption–desorption, X-ray diffraction (XRD), hydrogen-temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The results indicated that the reducibility of Ni–WO3/SBA-15 catalysts with high Ni loading was more similar to that of pure NiO. More importantly, the change of surface atomic content of Ni and W of Ni–WO3 catalysts with various Ni loadings resulted from the surface W species of the catalysts being gradually covered by Ni species with the increase of Ni loading.
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ENERGY & FUELS
·
2013
·
IF 2.853
Jie Liu,Dandan Cheng,Yue Liu,Zhongbiao Wu
One-step synthesized sulfonic-acid-functionalized SBA-15 (denoted as αSSBA-15) impregnated with polyethyleneimine (PEI) was used for CO2 capture in this study. The resulted sorbents were characterized via a range of analytical techniques, including transmission electron microscopy (TEM), 29Si magic angle spinning (MAS) nuclear magnetic resonance (NMR), infrared (IR), thermogravimetry–differential scanning calorimetry (TG–DSC), etc. Experimental results showed that the incorporation of propanesulfonic acid groups into the inner structure of the silica support had brought dramatic improvement in CO2 adsorption capacity, of which PEI/5SSBA-15 showed the highest CO2 adsorption amount. The main reason of this increased capacity could be attributed to the enhanced CO2 diffusion into bulk networks of PEI polymers because of its better dispersion in the pores of support, where the extended propanesulfonic acid groups on the inner surface could spatially disperse the subsequent loaded PEI molecules. Furthermore, the PEI/5SSBA-15 also exhibited superior stable cyclic adsorption/desorption performance compared to PEI/SBA-15, especially after 5 cycles. This was assumed because the enhanced surface acidity of PEI/5SSBA-15 anchored the NH2/NH groups through acid–base interaction, reducing the loss of active sites.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jialong Ou,Yuanhao Wang,Fei Liu,Tianxiang Zhao
The development of metal-free and high-efficiency heterogeneous catalysts for the chemical conversion of CO 2 into value-added chemicals is crucial for carbon cycling. Here, we report the synthesis of a four-armed urea-functionalized ionic salt that incorporates active bromide ions (Br − ) and urea groups. This salt was subsequently grafted onto ordered mesoporous SiO 2 (SBA-15) to catalyze the cycloaddition reaction between CO 2 and epoxides. The impacts of structure features, grafting density of the urea-functionalized ionic salts, and pore size of SBA-15 on catalytic performance were systematically investigated. The results obtained emphasize that SBA-15–5@TEU(1:1) demonstrates remarkable synergistic catalytic efficacy, facilitating the efficient transformation of various epoxides into cyclic carbonates through cycloaddition reactions in the absence of both solvents and cocatalysts. Notably, this catalyst achieves a maximum yield of up to 99%. Additionally, SBA-15–5@TEU(1:1) demonstrates excellent reusability, with no significant decrease in catalytic activity observed over multiple cycles. Mechanistic studies further elucidate the crucial roles of Br − and urea groups in facilitating the synergistic catalysis of CO 2 cycloaddition reaction. This work presents novel insights the design of metal-free and co-catalyst-free heterogeneous catalysts for efficient CO 2 conversion.
研究领域:
化学
·
材料科学
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10428-10440
·
IF 3.288
Hai-tao Wu,Lan-zhi Wang
Unique green-chemistry approaches have been developed for the one-pot synthesis of two series of novel 1,5-benzodiazepines 4 and 5. The CeCl3-KI promoted two-component domino reaction of 1,2-phenylenediamines with 1,3-acetonedicarboxylate in ethanol afforded novel 1,5-benzodiazepin-2-ones 4. An expedient approach to 1,5-benzodiazepines 5 has also been developed via three-component domino reactions using 1,2-phenylenediamines, 1,3-acetonedicarboxylate and aldehydes in the presence of a catalytic amount of magnetic nanoparticles (γ-Fe2O3@SiO2/CeCl3) in ethanol at ambient temperature. During the one-pot synthesis, one new seven-membered nitrogen heterocycle (diazepin) and four new bonds (one C–C, two C–N and one CC) were constructed by nucleophilic addition, elimination (dehydration, etc.), hydride transfer and cyclization reactions. The structures of all 48 products were fully confirmed by spectroscopic techniques and by single-crystal X-ray analysis for 5db. Moreover, plausible synthesis reaction mechanisms of two series of novel 1,5-benzodiazepines 4 and 5 have been proposed. The methods have advantages such as operational simplicity, mild reaction conditions, short reaction time, easy recovery and reusability of the catalyst, high yields of products, and the use of non-toxic EtOH as the solvent.
研究领域:
有机化学
·
药物化学
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Hongran Zhao,Tong Zhang,Rongrong Qi,Jianxun Dai,Sen Liu,Teng Fei,Geyu Lu
Mesoporous silicas loading hydrophilic materials composites were widely used in humidity sensors during the last decade. However, the physical mixing process used for loading the hydrophilic materials in the channel of mesoporous silicas is hard to guarantee their uniform dispersion, and there is no strong force to bind the host and guest materials together. To solve above problems, novel vinyl functionalized mesoporous silicas (SBA-15-vinyl) were chemically modified with hydrophilic sodium p -styrenesulfonate (SSS) with free radical polymerization . The chemical and porous structures of the obtained hybrid materials (SBA-15-PSSx) were characterized by fourier transform infrared spectroscopy (FT-IR), elemental analyses (EA), X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and N 2 adsorption-desorption. The humidity sensing properties of the sensors based on SBA-15-vinyl and SBA-15-PSS indicate the introduction of PSS could effectively enhance the sensing properties of SBA-15-vinyl. The impedance of the optimized sensor changed by more than three orders of magnitude over the relative humidity (RH) range of 11%–95%, with rapid response to RH change.
研究领域:
材料科学
·
化学工程
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2018
·
IF 5.08
Zhifeng Xu,Peihong Deng,Junhua Li,Siping Tang,Ying Cui
In order to improve the diffusion kinetics of molecularly imprinted materials (MIMs), applying imprinting technology to mesoporous materials is a promising strategy. In the present study, an imprinting approach based on the combination of mesoporous silica materials and molecular imprinting technology is reported. Molecularly imprinted material (MIM) for 2,4-dichlorophenoxyacetic acid (2,4-D) was prepared by using 2,4-D as the template molecule, alkyne-modified β-cyclodextrin and propargyl amine as the combinatorial functional monomers and SBA-15 as the supporter. The functional monomers were anchored to the azide-modified SBA-15 by azide–alkyne Click reaction. The synthesized MIM was characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA), thermal gravimetric analysis (TGA), low-angle X-ray diffraction (XRD) and N 2 adsorption–desorption analysis. The interactions between template and functional monomers were studied by proton NMR analysis and UV–vis experiments. The results of the equilibrium binding experiments and selective tests showed that the prepared MIM has binding affinity and specificity for a group of analytes which have similar size and shape to those of template. Binding kinetic experiments demonstrated that the present imprinting approach can effectively enhance the mass transfer rate. The solid phase extraction of 2,4-D using MIM as the adsorbent was investigated. The extraction conditions for the processes of loading, washing and eluting were optimized. The recoveries of the molecularly imprinted solid phase extraction (MISPE) column for 2,4-D were 76.3–88.9% with relative standard deviations (RSD) of 3.48–7.64%.
研究领域:
材料科学
·
分析化学
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高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2012
·Vol. 30
·期 7
·1571-1574
·
IF 0.755
Jing Cao,Yang Li,Junxiang Feng
Two kinds of novel styryl chemosensory 2-FMNC and 3-FMNC, were designed and synthesized by an apporiate introduction of 9-benzylidene-9 H -fluorene group as fluorophore with the aim at avoiding photoisomerisation. These 9-benzylidene-9 H -fluorene derivatives showed the similar selectivity and sensitivity upon addition of metal ions. The sensitivity of FMNC to alkaline earth metal ions was Ba 2+ >Sr 2+ >Ca 2+ ≈Mg 2+ .
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Xiao-Chun Deng,Xiao-Dong Kang,Guo-Hua Zhang
The (TiZrHfNbTaMo)C-15 wt.% Co ceramics with excellent comprehensive properties were successfully prepared by vacuum liquid phase sintering. The effects of WC content on the grain size, microstructure, and mechanical properties were investigated. The results showed that WC was dissolved into (TiZrHfNbTaMo)C phase to form a seven-component solid solution, and the independent WC phase disappeared. The addition of WC improved the wettability between the ceramic phase and the metal phase and promoted the densification of the ceramics. In addition, WC played a role in refining grains and inhibiting the grains growth to a certain extent. The comprehensive properties of ceramics were improved by solid solution strengthening and high entropy effect. When the WC content was 5 wt.%, the toughness reached the maximum of 9.41 ± 0.15 MPa·m 1/2 , and the hardness of the ceramic with 10 wt.% WC achieved the highest value of 18.18 ± 0.20 GPa.
研究领域:
材料科学
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陶瓷工程
·
机械工程
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-11
·
IF 6.408
An Dong-Yu,Pu Wan-Rong,Wang Yang,Xue-Zhang,Huang Yan-Ping,Liu Zhao-Sheng
For the first time a hybrid molecularly imprinted polymer (MIP) doped with 3-(trimethoxysilyl) propyl methacrylate (γ-MPS)-modified mesoporous molecular sieve SBA-15 for target peptide recognition has been developed. Zinc acrylate and methacrylic acid were used as binary functional monomers, and ethylene dimethacrylate was used as cross-linking agent to prepare an imprinted monolith against Val-Tyr-Ala-Leu-Lys(glutarylation) (VYALK glu ). The morphology of the polymers was characterized by scanning electron microscopy, FT-IR spectroscopy, energy dispersive spectroscopy, and 1 H NMR. The SBA-15-MPS MIP showed high recovery of 87.1% and the IF of 12.9 for the enrichment of the template peptide. When the template peptide concentration ranged from 5 to 90 μg mL −1 , the correlation coefficients ( R 2 ) for the calibration function obtained was better 0.999. The limit of detection (LOD, 0.30 μg mL −1 ) and limit of quantification (LOQ, 1.0 μg mL −1 ) were achieved for signal-to-noise ratios of 3:1 and 10:1, respectively. When other kinds of synthetic peptides were used as analogs, the selectivity of the SBA-15-MPS MIP was much better than the SBA-15-MPS NIP (without template peptides) with relative selectivity coefficients of 52.8-265. In contrast, little quinolones and biogenic amines are adsorbed with the SBA-15-MPS MIP. The SBA-15-MPS MIP could enrich VYALK glu from spiked histone digestion with the average recovery of 87.8% and the relative standard deviation (RSD) of 0.99%. As a conclusion, doping of SBA-15 is an effective approach to the improvement of performance of molecularly imprinted monolith. Graphical abstract
研究领域:
分析化学
·
材料科学
·
生物化学
·
色谱学
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Zhikun Wang,Wentao Qu,Yunchao Peng,Jianqiang Zhang,Songqing Hu
The synergistic adsorption of carbon dot and chitosan on metal-corrosive solution interface remains complex and elusive due to their distinct architecture and chemistry. Here, copper-doped carbon dot (CuCD) and pyridine-grafted chitosan (CS-4PCA) are designed as a synergistic corrosion inhibition duo in 15 % HCl. Weight loss tests showed that the optimal CuCD (200 mg/L) and CS-4PCA (200 mg/L) individually achieved inhibition efficiencies of 67.66 % and 73.27 %, respectively. Remarkably, their binary mixture (150 mg/L CuCD + 50 mg/L CS-4PCA) exhibited a synergistic efficiency of 83.27 %, surpassing the performance of either component at the same total concentration. The addition of benzotriazole (200 mg/L) further enhanced the efficiency to 92 %. Surface characterization revealed that the CuCD/CS-4PCA composite film reduced the surface roughness of N80 steel from 32.27 μm (blank) to 8.01 μm, forming a compact protective layer. Molecular dynamics simulations demonstrated that CuCD adsorbed parallel to the Fe surface, while CS-4PCA chains filled the gaps, synergistically inhibiting corrosive particle penetration. This work provides insights into the design of high-performance compound inhibitors for harsh acidic environments.
研究领域:
材料科学
·
腐蚀与防护
·
表面化学
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高影响因子
危险品化学品经营许可证（带存储）