Molecular Catalysis
·
2021
·
IF 5.062
Jiarong Li,Zhe Liu,Guangfa Hu,Ruimin Gao,Ronglan Zhang,Jianshe Zhao
A series of hybrid catalyst PMoW@HKUST-1@ZSM-5-MCM-41 was prepared in which H 3 PMo 6 W 6 O 40 were supported in the pore of micro/mesoporous materials ZSM-5-MCM-41 and HKUST-1 by one-pot method. Five types of ZSM-5-MCM-41 were prepared and corresponding ODS catalysts PMOW@HKUST-1@ZSM-5-MCM-41 were synthesized. The prepared catalysts were characterized and the most efficient catalyst was selected by XRD, FT-IR, UV–vis, N 2 adsorption-desorption, SEM, TEM. The removal of DBT reached 98.13 % by using PMoW@HKUST-1@ZSM-5-MCM-41−2 under 60 °C with molecular oxygen as oxidant after 150 min. After desulfurization, the catalyst can be simply recovered and reused 7 times with an unnoticeable decrease in catalytic activity, indicating the successful combination of heteropolyacids and micro/mesoporous materials for desulfurization.
研究领域:
化学工程
·
催化材料
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DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 5
·677
·
IF 2.467
Xiaolong Zheng,Meiyu Wang,Qiuping Li
Due to the wide potential application in the fields of sensing, lighting materials, and optical–electrical multifunctional devices, rare earth complex hybrid materials have been studied extensively over the past decades. A poly(ionic liquid)/mesoporous-based hybrid system which has been functionalized by the covalently linked europium complexes was reported here. Through surface modification with a coupling agent bearing an vinyl group, MCM-41 was chosen as the carrier matrix for poly(ionic liquids) (PILs) and europium compounds, and based on that, novel luminescent hybrid materials were prepared by confining the ionic liquid and europium complexes into the inorganic Si–O frameworks. The resulting organic/inorganic materials are chemically bonded hybrids which show good photoluminescent properties such as broad excitation spectra, line-like emission spectra, and long luminescence lifetimes. The PILs/MCM-41/Eu3+hybrid reported here is a rare earth multifunctional material which is believed to have potential applications in the field of optical–electrical materials.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 16
·6251-6260
·
IF 3.288
Chaowei Wang,Zhe Liu,Ruimin Gao,Jinhua Liu,Siying An,Ronglan Zhang,Jianshe Zhao
Novel composite materials of vanadium-substituted Keggin-type polyoxometalates anchored on amine-functionalized Ce-MCM-41 (POM/APTES-CeM) are successfully synthesized and fully characterized by FT-IR, XRD, N2 adsorption–desorption isotherms, SEM, TEM, EDX, and XPS. The catalytic activities of these new catalysts are evaluated for the oxidative desulfurization of the model fuel with molecular oxygen as an oxidant. Meanwhile, the optimal reaction conditions are investigated, including the loading amount of POM, catalyst mass, reaction temperature, agitation rate and the amount of oxygen. This result shows that PW9V3/APTES-CeM-50 exhibits the highest catalytic activity with a desulfurization performance of 99.26% as well as brilliant reusability and catalytic efficiency with slight diminution after being used consecutively eight times. Moreover, the kinetic study displays that the oxidative desulfurization process conforms to the pseudo-first-order model.
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
Pharmaceutics
·
2020
·Vol. 12
·期 2
·169
·
IF 4.421
Xiaojing Liu,Jingfu Jia,Shulei Duan,Xue Zhou,Anya Xiang,Ziling Lian,Fahuan Ge
Antimicrobial medicine and food packages based on bio-based film containing essential oils have attracted great attention worldwide. However, the controlled release of essential oils from these film nanocomposites is still a big challenge. In this study, a long-term antibacterial film nanocomposite composed of zein film and cinnamon essential oil (CEO) loaded MCM-41 silica nanoparticles was prepared. The CEO was loaded into MCM-41 particles via modified supercritical impregnation efficiently with a high drug load (>40wt%). The morphologies of the prepared nanoparticles and film nanocomposite were characterized by a scanning electron microscope. The release behaviors of CEO under different temperatures, high humidity, continuous illumination and in phosphate buffer solution (PBS) solution were investigated. The results showed that the film nanocomposite had an outstanding release-control effect. The addition of MCM-41 nanoparticles also improved the mechanical properties of zein films. The antibacterial effect of CEO was significantly prolonged by the film nanocomposite; indicating the CEO film nanocomposite fabricated via modified supercritical CO2impregnation was a potential long-term antibacterial medicine or food package material.Keywords:film nanocomposite;essential oil;supercritical CO2;long-term package
研究领域:
材料科学
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食品科学
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生物技术
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药学
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DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Jianguo Zhuang,Siyan Yan,Peng Zhang,Xinhui Liu,Yitao Zhao,Yijun Yu,Yuchen Wang,Qichao Zhao,Haidan Wu,Xuedong Zhu,Fan Yang
Nickel (Ni) supported on MCM-41 zeolite as hydrogenation catalysts have been widely applied in various reactions, however, the synergism between Ni and the support remains obscure. To prepare more efficient catalysts and reveal the metal-support interaction, MCM-41 zeolite was modified with ammonium hexafluorosilicate (AHFS) before Ni loading. Results show that fluoride ions could selectively convert the vicinal silanols into isolated silanols on MCM-41 surface, which weakens the interactions between Ni precursors and the SiO 2 supports. Over the modified MCM-41 zeolites, the attenuated interaction results in the agglomeration of NiO particles that is more easily to be reduced, rather than the formation of nickel phyllosilicate which is extraordinarily difficult towards reduction. The easily-reduced Ni particles provided more adsorption sites for C C bond instead of C O bond, and the adsorption strength was also regulated. Therefore, the AHFS modified catalyst demonstrated a notable enhancement in hydrogenation of maleic anhydride (MA) into succinic anhydride (SA), presenting 98.4 % MA conversion and 99.8 % SA selectivity at 90 °C under 3.0 MPa H 2 . Moreover, the optimum catalyst was recycled for 5 runs to analyze the deactivation mechanism, it was found out that the loss of activities stems from the leaching of large Ni particles. Overall, our work shed light on the metal-support interactions for Ni/MCM-41 catalyst, determining the vicinal hydroxyl groups were responsible for the state of Ni species, which is helpful for the rational design of other hydrogenation catalysts.
研究领域:
催化
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化学工程
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2014
·Vol. 16
·期 12
·1-11
·
IF 2.278
Sang Yu,Jiao Qingze,Li Hansheng,Wu Qin,Zhao Yun,Sun Kening
A series of HZSM-5/MCM-41 composite molecular sieves (HZM-Ns ( x )) were prepared by employing nano-ZSM-5 zeolites with the SiO 2 /Al 2 O 3 ratios ( x ) of 50, 100 and 150 as the source. These materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, N 2 adsorption–desorption measurement, and NH 3 temperature-programmed desorption. The catalytic cracking of endothermic hydrocarbon fuels over the HZM-Ns with n -decane as model was evaluated at atmospheric pressure and 500 °C. The effect of the parent zeolite, mesopore and SiO 2 /Al 2 O 3 ratio on the structure, acidity, and catalytic performance of HZM-Ns was investigated. The HZM-Ns exhibited a skeletal matrix with nano-sized HZSM-5 particles (200–300 nm) with a controllable acidity well dispersed in and microporous–mesoporous hierarchical pores. The mesoporous structure improved the diffusion of the reactants and products in the pores, and the HZSM-5 nanoparticles uniformly dispersed in the MCM-41 matrix supplied a proper acidity, shorter channels, and a higher specific surface area for reaction. These resulted in a high catalytic activity, a high selectivity to light olefins and a long lifetime for n -decane catalytic cracking. The HZM-N (150) exhibited the excellent conversion, a high selectivity to light olefins and a long lifetime due to low diffusion resistance, high specific surface area, and appropriate acid distribution and strength, with the increasing SiO 2 /Al 2 O 3 ratio.
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·
IF 5.8
Yang Yanzhi,Xu Mingchen,Jin Wenlou,Jin Jiacheng,Dong Fan,Zhang Zhipeng,Yan Xin,Shao Min,Wan Yushan
In this study, a polyaniline/mesoporous silica (PANI/MCM-41) composite material that can be used as a filler for permeable reactive barrier (PRB) was prepared by in situ polymerization. Firstly, the adsorption capacity of PANI/MCM-41 on Cr (VI) in solution was investigated. The results show that the prepared PANI/MCM-41 exhibits a significant Cr (VI) adsorption capacity (~ 340 mg/g), and the adsorption process is more accurately described by the Langmuir isotherm and pseudo-second-order kinetic model. The thermodynamic functions evidenced that the Cr(VI) adsorption was an endothermic spontaneous process. In addition, adsorption–desorption cycle experiments proved the excellent reusability of the material. Subsequently, the material was utilized as a filler in the PRB for the remediation of Cr(VI)-contaminated soil using electrokinetic-permeable reactive barrier (EK-PRB) technology. The results show that compared with traditional electrokinetic remediation, the use of PANI/MCM-41 as an active filler can enlarge the current during remediation and enhance the conductivity of soil, which increases the removal rates of total Cr and Cr(VI) in soil (17.4% and 10.2%).
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产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Li Renna,Chong Shijia,Altaf Naveed,Gao Yanshan,Louis Benoit,Wang Qiang
In this research, we investigated the hydrophobicity and dynamic adsorption-desorption behaviors of volatile organic compounds (VOCs) by applying different optimized coating dosage (25, 50, and 75%) on designed novel ZSM-5/MCM-41 and ZSM-5/Silicalite-1 hierarchical composites. The relatively large specific surface area and pore volume of adsorbents ZSM-5/MCM-41 and ZSM-5/Silicalite-1 composites with excellent stability were affirmed by ex-situ XRD, FTIR, BET, SEM, and water contact angle analyses. Regarding, toluene adsorption-desorption investigation, ZSM-5/MCM-41 composite lead a longer stable toluene breakthrough time no matter under dry or 50% humid conditions. However, under different loading dosage condition, the breakthrough time of 75% coating ratio was the longest, which was 1.6 times as long as that of pure ZSM-5 under wet adsorption. Meanwhile, the complete elimination of toluene for ZSM-5/MCM-41-75% was done by largest desorption peak area and the lowest desorption temperature of 101.9°C, while, the largest contact angle of ZSM-5/MCM-41-75% was 17.0° higher than pure ZSM-5 zeolite. Therefore, we believe that the present hydrophobic sorbent will provide new insight with great research potential for removing low concentration of VOCs at industrial scale.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2021
·
IF 5.541
Xiaohua Li,Jinlong Yan,Shanshan Shao,Shengnan Ge,Zhichao Lv,Yixi Cai
A method of template removal by direct non-thermal plasma (DNTP) system for the synthesis of HZSM-5/MCM-41 meso-micropore composite catalyst was proposed for the production of aromatic hydrocarbons by catalytic pyrolysis of rape straw. It was revealed most of the template on the catalyst was removed by oxidizing substances such as ozone produced by DNTP. During DNTP treatment, the removal effect of the template was greatly affected by the oxygen flow rate . Also, the catalyst structure was bombarded by high-energy electrons obtained by DNTP treatment, and the physicochemical property of the synthetic composite catalysts was treated quite different from that obtained by calcination method. Under the treatment condition of 22 kV-2 L/min, the BET surface area was boosted significantly by 29.91% and the amount of acid sites was boosted by 37.71%, the yield of MAHs reached 10.57 wt%. Generally, not only the template can be effectively removed by DNTP treatment, but also the physicochemical property of meso-micropore composite catalyst can be improved, and thus promoted the catalytic performance for monocyclic aromatic hydrocarbons. Therefore, DNTP is an effective technology for removing template and the catalytic performance can be efficiently improved.
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DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Ziwen Zhao,Hong Tian,Zhengye Chen,Zhangjun Huang,Shan Cheng,Siying Liu
This study employed torrefied wheat straw (260°C) as feedstock to synthesise a bifunctional metal-modified composite zeolite catalyst through alkali treatment (NaOH), dual metal loading (Fe and Ni), and hierarchical MCM-41 construction. Catalytically assisted pyrolysis behaviour was investigated using a tube furnace and Py-GC/MS system, evaluating the effects of pyrolysis temperature and catalyst/feedstock mixing ratio on product distribution and bio-oil composition. Results indicate that at a catalyst/feedstock ratio of 3:2, bio-oil yield peaked at 28.41% at 500°C, concurrently achieving a maximum monocyclic aromatic content of 66.36%. Elevating pyrolysis temperature promoted aromatic formation while significantly suppressing oxygenated compounds; notably, phenolic components decreased by 13.94% at 500°C, indicating the 1Ni1FeHR@M catalyst's potent deoxygenation capability. Further optimisation of the catalyst/feedstock blending ratio revealed that a 3:2 ratio yielded the highest combined bio-oil and monocyclic aromatic hydrocarbon production (18.62%), confirming this catalytic strategy effectively shifts the product distribution towards higher-value hydrocarbon fuels.
研究领域:
生物能源
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催化
·
热解
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可再生能源
·
生物质转化
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2014
·
IF 3.209
Bing Yan,Qiu-Ping Li
Several kinds of novel lanthanide organic–inorganic mesoporous hybrid luminescent materials have been assembled by introducing the ternary lanthanide ions (Eu 3+ , Tb 3+ ) and beta-diketone (TTA, TAA) into the functionalized mesoporous hosts through the coordination bond and covalent bond by using 3-chloropropyltriethoxysilane modified 1,4,7,10-tetraazacyclododecane (Cyclen-Si) as an organic bridge molecule. These multicomponent hybrids are characterized by FTIR, TEM, XRD, thermogravimetric analysis, diffuse reflectance UV–Vis spectra and nitrogen adsorption–desorption isotherms, especially the photoluminescence properties of them. The luminescent spectra of the hybrids reveal that the MCM-41 based materials show strong emission intensities, high luminescent quantum efficiencies, long luminescent lifetimes and exhibit characteristic red and green luminescence originated from lanthanide ions (Eu 3+ or Tb 3+ ), which suggesting the Cyclen-Si bridge molecule is favorable for the assembly of lanthanide functionalized luminescent hybrids.
研究领域:
材料科学
·
光化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shuang Zheng,Shaojuan Zeng,Guilin Li,Xiaoqian Yao,Zhengchen Li,Xiangping Zhang
Effective capture of trace CO 2 in atmosphere or confined spaces to ensure human beings safety draw a lot of attention, however, how to simultaneously improve CO 2 capacity and selectivity still faces great challenge. Herein, combining porous molecular sieves (SBA-15 and MCM-41) and the anion-functionalized ionic liquid (IL) tetraethylammonium glycinate ([N 2222 ][Gly]), a series of hierarchically porous IL composites with different IL loadings were designed and prepared. Compared with pristine supports, the incorporation of [N 2222 ][Gly] simultaneously improves CO 2 capacity and CO 2 /N 2 selectivity by orders of magnitude, especially for confined spaces (<5000 ppm) and air (415 ppm). When the IL loading was 60 wt%, novel micropores were created, especially ultra-micropores (<0.65 nm), which are not present in bare supports and other [N 2222 ][Gly]@SBA-15 (15, 30 and 45 wt%). Among them, 60 wt%[N 2222 ][Gly]@SBA-15 showed the highest CO 2 uptake of 1.45 and 1.88 mmolCO 2 /g-adsorbent at 0.0005 and 0.005 bar under 313 K along with recyclability, which are much superior to the state-of-the-art reported values. Moreover, superb ideal CO 2 /N 2 selectivity of 11,545 at 0.005 bar and 288 K was achieved, which was 288 times that of SBA-15. Meanwhile, mixed gas breakthrough experiments demonstrated that 60 wt% [N 2222 ][Gly]@SBA-15 shows outstanding CO 2 separation performance under simulative confined spaces and ambient air. The ultra-high CO 2 separation performance was attributed to the synergy of chemical interaction between the IL anion and CO 2 as well as newly created micro- and ultra-micropores effect. This work provides guidelines for the design of IL composites with ultra-micropores for efficient trace CO 2 removal.
研究领域:
环境科学
·
材料科学
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）