BioEnergy Research
·
2015
·Vol. 8
·期 3
·1263-1274
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IF 3.541
Zhang Zhi-bo,Lu Qiang,Ye Xiao-ning,Wang Ti-peng,Wang Xian-hua,Dong Chang-qing
Solid phosphoric acid (SPA) catalysts with different carriers were prepared and used for catalytic fast pyrolysis of poplar wood to produce levoglucosenone (LGO), a valuable anhydrosugar derivative that can be used in various organic synthesis applications. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to evaluate the catalytic capabilities of these catalysts under different reaction conditions. The results indicated that SPA catalyst prepared with the SBA-15 carrier exhibited the best catalytic capability for selectively producing LGO. Both the catalytic pyrolysis temperature and catalyst-to-biomass ratio affected the pyrolytic products greatly. The maximal LGO yield reached as high as 8.2 wt% from poplar wood, obtained at the pyrolysis temperature of 300 °C and the catalyst-to-biomass ratio of 1. The by-products during the catalytic pyrolysis process were mainly acetic acid (AA) and furfural (FF). In addition, the SPA catalyst possessed better catalytic capability than the liquid phosphoric acid (H 3 PO 4 ) catalyst to produce LGO.
研究领域:
生物能源
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催化化学
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生物质转化
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热解化学
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绿色化学
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可再生资源利用
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 14
·6192-6205
·
IF 3.591
Haiqing Xu,Yuhang Gao,Qiantu Tao,Aiping Li,Zhanchao Liu,Yinhua Jiang,Hongwei Liu,Rongguang Yang,Yan Liu
A novel salicylic acid (SA) molecularly imprinted polymer (MIP) has been synthesized successfully by a surface imprinting technique based on the SBA-15 nanoreactor. SBA-15, selected as the nanoreactor for immobilizing the monomers and template molecules, would be an option to develop a new SA imprinting strategy. The obtained imprinted materials were characterized by Fourier transmission infrared spectrometry (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and nitrogen adsorption–desorption isotherms. The results suggested that MIP possessed an excellent ordered hexagonal mesoporous structure, which preserved the highly ordered mesoporous structure of SBA-15. Experimental variables influencing the adsorption process, including the initial pH, initial concentration and temperature, were optimized by the three-level Box–Behnken experimental design with the three factors combining the response surface method (RSM) for the first time. The optimal adsorption conditions were obtained to achieve the maximum adsorption capacity of SA as follows: initial solution pH 4.62, initial SA concentration 52.38 mg L−1, and temperature 35.0 °C. Under these conditions, the experimental value of the adsorption capacity was 44.435 mg g−1, which was very close to the predicted value (43.429 mg g−1). Furthermore, the adsorption isotherm and selectivity towards SA onto MIP and non-imprinted polymer (NIP) were investigated, indicating that MIP had splendid recognizing ability and a superior specific adsorption capacity (145.19 mg g−1) compared to that of NIP (64.30 mg g−1) at 35 °C. Meanwhile, MIP was regenerated and found to be suitable for reuse in successive adsorption–desorption cycles five times without significant loss in the adsorption capacity. The results suggested that MIP could be used as an excellent adsorbent for the efficient removal of SA from aqueous solution.
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Molecular Catalysis
·
2020
·
IF 3.687
Yi Yu,Fanfan Li,Zhouxuan Zang,Li Xu,Guoji Liu
Catalytic oxidation of 2-methylnaphthalene to 2-methyl-1,4-naphthoquinone (vitamin K 3 ) is a significant pathway to produce vitamin groups K. High pollution and low-productivity of the traditional method require a greener catalyst and process. In this work, Al/Ti-SBA-15 with different n Si /n Al and n Si /n Ti ratios were hydrothermally prepared in mild acidic condition and tested in partial oxidation of 2-methylnaphthalene. Commercial zeolites NaY, β and ZSM-5 were applied to investigate the influence of mass transfer resistance and acidity on catalytic performance. Catalysts were characterized by XRD, N 2 adsorption-desorption, TEM, NH 3 -TPD, FTIR and Py -FTIR. We have found that the 2-methylnaphthalene conversion and vitamin K 3 selectivity depend strongly on the mesoporous structure as well as Brönsted acid concentration and strength. Irregular micropores and strong acidity will accelerate the cleavage of C = C in aromatic rings, leading to the production of phthalic anhydride. DFT calculation reveals that incorporation of aluminum in SBA-15 can reduce the energy gap, facilitating the electron transfer. And as a consequence of the substitution of Al in tetrahedral positions in SBA-15, Al-SBA-15 (10) gives the best result with 72% yield to vitamin K 3 . This catalyst markedly reduces the activation energy due to the modified activated center. Repeated experiments recommend that Al-SBA-15 is a steady and high-efficiency catalyst for the production of vitamin K 3 .
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CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Huimin Liu,Yuming Li,Hao Wu,Jiaxiong Liu,Dehua He
Organic compounds containing multiple hydroxyl groups, namely α-cyclodextrin and γ-cyclodextrin, were used as additives for promoting Ni dispersion on supported Ni/SBA-15 catalysts. Catalysts prepared using modified and unmodified impregnation methods were characterized using N 2 adsorption-desorption isotherms, X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, and thermogravimetric analysis, and their catalytic performance in the CO 2 reforming of methane (CRM) to syngas was evaluated. The results show that compared with Ni/SBA-15 prepared using a conventional impregnation method, the cyclodextrin-modified catalysts had smaller NiO particles. They also exhibited higher catalytic activity and had stronger ability to resist carbon deposition in the CRM. Mechanistic studies showed that for the unmodified catalysts, Ni 2+ could migrate into the channels of SBA-15 as a result of concentration differences, and the Ni species were sintered during the following thermal treatment processes, and could not be well dispersed. In contrast, various types of complex were formed between Ni(NO 3 ) 2 and the cyclodextrins, and this would be favorable for Ni 2+ being taken into the channels of the SBA-15. The presence of cyclodextrins was beneficial to the mutual isolation of Ni species, and finally resulted in better dispersion of Ni species.
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Catalysis Science & Technology
·
2016
·Vol. 6
·期 16
·6406-6416
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IF 5.287
Mengshuai Liu,Kunqi Gao,Lin Liang,Jianmin Sun,Li Sheng,Masahiko Arai
The combination of a metal-modified SBA-15 catalyst with potassium iodide was developed as heterogeneous dual catalysts for chemical fixation of CO2 to cyclic carbonates. It was observed that the binary Zn-SBA-15/KI catalysts were the most efficient among various metal-modified SBA-15/KI catalysts and showed an excellent synergetic effect in promoting the reaction under mild conditions. Moreover, the effects of reaction parameters on cycloaddition of CO2 with propylene oxide (PO) to propylene carbonate (PC) were optimized. Under the optimal conditions determined, the Zn-SBA-15/KI catalytic system was also versatile in CO2 cycloaddition with other epoxides. Additionally, the mechanistic details for the fixation of CO2 into a cyclic carbonate catalyzed by SBA-15/KI and Zn-SBA-15/KI were also contrastively elucidated using the density functional theory (DFT) method. The DFT results suggested that the zinc-modified and unmodified catalysts showed different coupling modes of CO2, and the ring-opening reaction was the rate-determining step in the SBA-15/KI catalyzed cycloaddition reaction, but the zinc-modified SBA-15/KI catalysts could enhance the CO2 cycloaddition, as the formation of a stable complex was beneficial to CO2 trapping. As a result, the ring-closing reaction became the rate-determining step in the Zn-SBA-15/KI catalyzed cycloaddition reaction, which was a promising result to guide the catalyst design for CO2 conversion.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Rong He,Zhihong Wang,Lei Tan,Yi Zhong,Weiming Li,Da Xing,Chaohai Wei,Youwen Tang
We developed two types of novel highly ordered Ni 2+ imprinted mesoporous organosilica materials (SBA-15 (NiIMS1) and MCM-41 (NiIMS2)) through co-condensation for selective adsorption of Ni 2+ from electroplating Ni 2+ effluents. FTIR and solid-state 13 C NMR spectra demonstrated the successful embedment of functionalized iminodiacetic acid and ethanediamine chelating groups in NiIMS1 and NiIMS2, respectively. X-ray photoelectron spectroscopy analysis confirmed that Ni 2+ was coordinated by N atom and carboxyl O atom of the functional groups. Furthermore, NiIMS1 and NiIMS2 displayed highly ordered periodic hexagonal P6mm meso-structure, large surface area, and highly specific recognition ability toward Ni 2+ . The adsorption experimental results proved that NiIMS1 was suitable for acidic wastewater treatment , whereas NiIMS2 was fit for alkaline wastewater. The saturated adsorption capacity of NiIMS2 was 20.8 mg/g at pH 6.0, and that of NiIMS1 reached up to 22.9 mg/g at pH 3.0. The values of selectivity coefficients of NiIMS1 and NiIMS2 for five competing metal ions ranged from 46.4 to 12.4 and 36.9 to 18.8, respectively. The adsorption efficiency of NiIMS1 was above 92.5% even after seven extraction-stripping cycles, while that for NiIMS2 was 90.9%. The real sample adsorption experiments demonstrated that these mesoporous organosilica materials have high potential for water treatment applications.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 1.9
Sarmad Soomro,Zhenkun Sun,Dennis Y. Lu,Zhihao Zhou,Lin Li,Lunbo Duan
Catalyst deactivation due to carbon deposition and sintering poses a significant challenge to the efficient dry reforming of CH 4 and CO 2 into syngas, particularly at high Ni loadings. To tackle this difficulty, ordered mesoporous silicas with varied pore symmetries were employed as supports in this study to synthesize the Ni-based catalysts using hydrothermal treatment. The 10% Ni/MCM-41 catalyst exhibited the highest conversion rates for CO 2 (81%) and CH 4 (77%), with favourable H 2 /CO (0.92) ratios indicating efficient syngas production Higher Ni concentrations increase active sites and catalytic performance, they also increase carbon deposition, reducing catalyst durability. At lower Ni loadings (4% Ni), catalysts with a 3D pore structure showed improved activity and stability, effectively reducing carbon deposition. This study demonstrates that optimized mesopore symmetries and Ni loadings can enhance catalyst efficiency and durability for syngas production.
研究领域:
化学工程
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材料科学
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jiasheng Li,Yong Tang,Zongtao Li,Xinrui Ding,Binhai Yu,Liwei Lin
Quantum-dot (QD) white light-emitting diodes (LEDs) are promising for illumination and display applications due to their excellent color quality. Although they have a high quantum yield close to unity, the reabsorption of QD light leads to high conversion loss, significantly reducing the luminous efficacy and stability of QD white LEDs. In this report, SBA-15 mesoporous particles (MPs) with two-dimensional hexagonal pore structures (2D-HPS) are utilized to largely enhance the luminous efficacy and color-conversion efficiency of QD white LEDs in excess of 50%. The reduction in conversion loss also helps QD white LEDs to achieve a lifetime 1.9 times longer than that of LEDs using QD-only composites at harsh aging conditions. Simulation and testing results suggest that the waveguide effect of 2D-HPS helps in reducing the reabsorption loss by constraining the QD light inside the wall of 2D-HPS, decreasing the probability of being captured by QDs inside the hole of 2D-HPS. As such, materials and mechanisms like SBA-15 MPs with 2D-HPS could provide a new path to improve the photon management of QD light, comprehensively enhancing the performances of QD white LEDs.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Fan Zhang,Yi Liu,Kai-Qiang Ma,Heng Yan,Yue Luo,Feng-Cheng Wu,Chu-Ting Yang,Sheng Hu,Shu-Ming Peng
A major environmental concern related to nuclear energy is wastewater contaminated with uranium, thus necessitating the development of pollutant-reducing materials with efficiency and effectiveness. Herein, highly selective mesoporous silicas functionalized with amine-bridged diacetamide ligands SBA-15-ABDMA were prepared. Different spectroscopy techniques were used to probe the chemical environment and reactivity of the chelating ligands before and after sorption . The results showed that the functionalized SBA-15-ABDMA had a strong affinity for uranium at low pH (pH = 3) with desirable sorption capacity (68.82 mg/g) and good reusability (> 5). It showed excellent separation performance with a high distribution coefficient ( K d,U > 10 5 mL/g) and separation factors SF U/Ln > 1000 at a pH of 3.5 in the presence of lanthanide nuclides, alkaline earth metal and transition metal ions . In particular, SiO 2 spheres-ABDMA was used as a column material, which achieved excellent recovery of U(VI) (> 98%) and good reusability for samples of simulated mining and nuclear industries wastewater. XPS and crystallography studies clearly illustrated the tridentate coordination mode of U(VI)/PEABDMA and the mechanism and origin behind the high selectivity for U.
研究领域:
环境科学
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材料科学
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核工程
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分析化学
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2010
·
IF 2.962
Yanzhuo Zhang,Jinghai Zhang,Tongying Jiang,Siling Wang
The purpose of this study was to develop spherical mesocellular foam (MCF) loaded with a poorly water-soluble drug, intended to be orally administered, able to improve the dissolution rate and enhance the drug loading capacity. Spherical MCF with a continuous 3-D pore system was synthesized using Pluronic 123 triblock polymer (P123) as a surfactant coupled with cetyltrimethyl ammonium bromide (CTAB) as a co-surfactant. A model drug, simvastatin (SV), was loaded onto spherical MCF via a procedure involving a combination of adsorption equilibrium and solvent evaporation . The drug release rate and the drug loading efficiency of spherical MCF were compared with those of fibrous SBA-15. Investigations using nitrogen adsorption , scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and HPLC demonstrated the successful incorporation of SV into the MCF host. It was found that spherical MCF has a high drug loading efficiency up to 37.5%, and higher than that of fibrous SBA-15 with a pore diameter of 6.5 nm. It is worth noting that fast release rate of SV was obtained from spherical MCF compared with SBA-15 and pure crystalline SV using enzyme-free simulated intestinal fluid (SIF, pH 6.8).
研究领域:
药剂学
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纳米技术
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药物递送
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材料科学
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生物医学工程
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Catalysts
·
2026
·Vol. 16
·期 2
·130
·
IF 4
Shanshan Duan,Zhonghua Lu,Yongkang Lv
The dry reforming of methane (DRM) is a kind of technology used for achieving resource utilization. In this paper, different Ni/SBA-15 catalysts were prepared by adjusting the pH of the impregnation solution and applying it during the DRM reaction. The relationship between the structure and catalytic performance of the catalyst was analyzed by characterization methods such as BET, XRD, H2-TPR, H2-TPD, XPS, TG, and Raman. The research results indicated that the dispersion of the catalyst’s active components could be regulated by changing the pH value of the impregnation solution. Among them, the Ni/SBA-15-2 catalyst exhibits good metal dispersion, and significantly enhances the activity of the catalyst. In addition, it also has strong CO2adsorption capacity, which improves the stability of the catalyst. At 700 °C, the conversions of CH4and CO2of the catalyst are 51% and 60%, respectively.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jingjing Jiang,Shijian Zhou,Jing Ding,Jinhe Sun
3.25 mg g −1 capacity at ultrahigh Mg 2+ /Li + ratio of 474.6 and excellent cycling use. • AlLi-LDHs were confined in SBA-15 pores via solvent evaporation-induced strategy. • Si-O-Al/Li interface increases electron density, boosting electrostatic adsorption. • Hydration-shell sieving effect excludes Mg 2+ , Na + , K + for selective Li + adsorption. The sustainable extraction of lithium from salt lake brines featuring high Mg 2+ /Li + ratios poses a severe technical bottleneck that limits the high-efficiency utilization of global lithium resources. Herein, a novel pore-confined AlLi-LDHs/SBA-15 adsorbent (SEI-AL/SBA-15-B) is rationally constructed via a solvent evaporation-induced method to break this limitation, which directs the exclusive and uniform growth of AlLi-LDH nanosheets inside the ordered mesochannels of SBA-15 rather than on the external surface. This architecture delivers three synergistic effects: (i) physical confinement suppresses nanosheet agglomeration, maximizing accessible active sites; (ii) interfacial Si-O-Al/Li covalent bonds reconstruct the local electronic structure, lowering the DFT-calculated adsorption energy of Li + (H 2 O) 4 from −1.61 eV (pristine AlLi-LDHs) to −3.06 eV; and (iii) a hydration-shell sieving effect, governed by the interplay of geometric radius and dehydration energy, efficiently excludes competing Mg 2+ , Na + and K + . The optimized adsorbent achieves a Li + uptake of 10.52 mg g −1 within 1 h in 800 mg/L LiCl solution (equilibrium capacity 12.11 mg g −1 at 4 h). Impressively, a capacity of 3.25 mg g −1 is preserved at an ultrahigh Mg 2+ /Li + mass ratio (474.6), which surpasses most reported AlLi-LDHs adsorbents. Normalization to the active LDH mass shows that SEI-AL/SBA-15-B exhibits a 2.85-fold higher capacity than pristine AlLi-LDHs, proving that the enhanced performance originates from improved active-site utilization rather than higher LDH loading. The adsorbent also demonstrates excellent stability over eight adsorption–desorption cycles. This work establishes mesopore confinement engineering as a powerful platform to overcome the inherent limitations of layered double hydroxide adsorbents, enabling sustainable lithium extraction from high Mg 2+ /Li + ratio salt lake brines. AlLi-LDHs were confined within SBA-15 mesopores by solvent evaporation-induced method to form SEI-AL/SBA-15 composite adsorbent. The mesoporous confinement effect suppresses the agglomeration of AlLi-LDHs, reconstructs the Si-O-Al/Li interfacial electronic structure to enhance electrostatic adsorption and coordination bonding capability, and reinforces size sieving by blocking large-sized competing hydrated ions. These synergistic effects enable SEI-AL/SBA-15-B high lithium adsorption capacity and ultrahigh selectivity in brine. Download: Download high-res image (140KB) Download: Download full-size image
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