INORGANICA CHIMICA ACTA
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2013
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IF 1.687
Yan-Jing Gu,Bing Yan
The synthesis of organics 9-hydroxyphenalenone (HPO), 2-methyl-9-hydroxyphenalenone (MHPO), 6-hydroxybenz[de]anthracen-7-one (HBAO), 5-amino-1,10-phenanthroline (phen-NH 2 ) and its functionalized mesoporous MCM-41 by covalent band are reported, as well as those of Europium (III) hybrid mesoporous materials, EuL 3 phen-MCM-41 (L = HPO, MHPO, HBAO). The photoluminescence and microstructural properties are characterized, and the XRD and BET results revealed that all of these hybrid materials have uniformity in the mesostructure. It is worth noting that the excitation spectra of these hybrid materials have a broad absorption, which occupies from UV to visible region (250–475 nm). Upon ligand-mediated excitation with the visible light, the low efficient energy transfer exhibit between the organic ligands and europium(III) ion under visible excitation, but the maximum wavelength (456 nm/457 nm/451 nm) located at blue light region, which is in consistent with the blue LED light, then might be a feasible alternative in producing time-resolved luminescence under LED-excitation.
研究领域:
材料科学
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化学
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光电技术
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2019
·
IF 3.47
Zhi Zheng,Jun Wang,Yi Wei,Xuejun Liu,Fengwen Yu,Jianbing Ji
La-Fe modified Si-MCM-41 (La-Fe/Si-MCM-41) catalysts were prepared by the wet impregnation method and used in catalytic cracking of soybean oil (CCS) for biofuel production. The catalysts were characterized by BET, XRD, XPS, Py-FTIR and CO 2 -TPD. The results showed that the aromatics content increased with the increase in B/L value, while the content of oxygenated compounds decreased, indicating that Brönsted acid sites were the major active sites for deoxygenation and aromatization reactions. Compared with Si-MCM-41, the Brönsted acidity of LFM-6 sharply decreased from 22.49 to 5.86 μmol g −1 . Accordingly, the aromatics content was reduced from 37.51 wt.% to 14.52 wt.% which was lower than the limitation (15 wt.%) according to the global environmental legislation. However, for the LFM-6 catalyst, the excessive loss of Brönsted acid sites and sharp decrease in BET surface area and pore volume led to the decrease in deoxygenation. As a result, the fatty acids content increased from 2.71 wt.% to 16.67 wt.% and the acid value reached 35.20 mgKOH g −1 . When the La-Fe loading increased to 15 wt.%, part of fatty acids were converted into ketones by the active sites on Fe 2 O 3 /La 2 O 3 and strong Lewis acid sites on catalysts. Besides, the new weak Lewis acid and basic sites on Fe 2 O 3 /La 2 O 3 exhibited the synergistic effect on promoting the generation of alkenes. The CaO/LFM-6 composite catalysts prepared by the mechanical mixing of LFM-6 and CaO were used in CCS to reduce the acid value of biofuel. LFM-6-C-3 was proved to be an effective catalyst for CCS to produce biofuel with low aromatics (12.31 wt.%) and fatty acids (2.76 wt.%) content.
研究领域:
催化
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生物燃料
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化学工程
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环境科学
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产品关联
DOI
高影响因子
ACS Omega
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2021
·
IF 3.512
Yixuan Huang,Guangcai Zhang,Qinhui Zhang
In the present work, an efficient and stable WOX/MCM-41 solid acid catalyst was prepared by the wet impregnation method. The characterization of powder X-ray diffraction, transmission electron microscopy, ultraviolet–visible, H2 temperature-programmed reduction, X-ray photoelectron spectroscopy, NH3 temperature-programmed desorption, and N2 adsorption–desorption isotherms confirmed that the impregnation amount and calcination temperature of WOX speciation affected the dispersity and acidity of the resulting catalyst. This WOX/MCM-41 solid acid catalyst was subsequently applied in the ketalization reaction of glycerol and acetone to produce solketal. By catalyst screening and reaction condition optimization, WOX/MCM-41 obtained by impregnating 20 wt % and calcining at 350 °C exhibited the highest solketal yield and catalytic stability.
研究领域:
催化
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化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2018
·Vol. 8
·期 66
·38124-38130
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IF 2.936
Jiaojing Zhang,Hua Song,Yanguang Chen,Tianzhen Hao,Feng Li,Dandan Yuan,Xueqin Wang,Liang Zhao,Jinsen Gao
Amine-modified MCM-41 adsorbents (APTMS/MCM-41, PEI/MCM-41 and AAPTS/MCM-41) were prepared and characterized by XRD, N2 adsorption–desorption, FT-IR, TEM, SEM and TG-DTA. The performance of each adsorbent in a fixed adsorption bed for H2S removal was measured using a mixture of oxygen, nitrogen and hydrogen sulfide gases. It was found that the specific surface area decreased and the topography changed significantly after the use of each modified adsorbent. Nevertheless, all amine-modified MCM-41 adsorbents retained mesoporous silica of MCM-41. The H2S removal rate and saturated H2S capacity of APTMS/MCM-41 improved from 32.3% to 54.2% and 119.5 to 134.4 mg g−1, respectively, compared with that of MCM-41, and it showed the best performance among all adsorbents. APTMS/MCM-41, PEI/MCM-41 and AAPTS/MCM-41 were regenerated by maintaining at 423, 523 and 373 K in nitrogen for 3 h, respectively, and thus possessed high regenerability.
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
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yilin Dong,Jing Sun,Xiaoling Ma,Wenlong Wang,Zhanlong Song,Xiqiang Zhao,Yanpeng Mao,Wenxiang Li
MnO x has received widespread attention in low-temperature catalytic oxidation of VOCs, however, the synergy effect of MnO x and support on the VOCs catalytic ozonation were rarely studied. In this study, five different MnO x /X (X: MCM-41, 13X, ZSM-5, HY, USY) were synthesized and found their support greatly affect the catalytic oxidation activity. MnO x /MCM-41 presents the largest specific surface area, pore volume and unique surface morphology, and thereby provides more sites for MnO x loading and VOCs adsorption. Moreover, MnO x /MCM-41 presents a high proportion of Mn 3+ , which helps to enhance the ion exchange capability, and thus promotes the regeneration of oxygen vacancies. Furthermore, a part of Mn was proved to be introduced into the MCM-41 lattice, which can promote the electron transfer between the active components and the support, and thereby effectively improve the surface electronic properties of the catalyst. The toluene catalytic experiments showed that MnO x /MCM-41 exhibited the best catalytic activity , presenting complete degradation of O 3 and VOCs at room temperature. In addition, 5 wt%MnO x /MCM-41 exhibited better catalytic activity than other loading, and its higher surface oxygen species endowed it with strong water resistance and stability. In-situ DRIFTs indicated that toluene was initially oxidized into benzyl alcohol during the adsorption process, and then decomposed to intermediate products (benzaldehyde, phenolate, etc.) during the catalytic ozonation process, and finally oxidized to carbon dioxide. In conclusion, the supply of loading sites and the improvement of interfacial electron transfer are the manifestations of the synergy between the support and MnO x , leading to the promotion of the catalytic ozonation of VOCs.
研究领域:
环境科学
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催化材料
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Yuhang Huang,Pingwei Yang,Shaokai Sun,Liyun Mao,Yunyun Zhou,Ying Liu,Juanjuan Peng,Lingzhi Zhao
Porous silica materials can serve as hemostats, offering a promising approach to promote the coagulation speed. The pore structure of porous silica is a critical property, which may influence the hemostatic effectiveness, though its exact role in the hemostasis process remains unclear. Given that the key structural parameters of porous silica, including pore size, surface area, and pore volume, exhibited strong interrelationships that significantly influence each other, we prepared porous silica with pore sizes ranging from 2.5 to 50 nm to study their hemostatic effects by both in vitro and in vivo assessments. The results demonstrated that the mesoporous material MCM-41 with small pore size (2.5 nm) and high specific surface area exhibited superior contact activation capability to the coagulation pathway. In contrast, the macroporous siliceous foam (MSF) with large pore size (50 nm) and large pore volume showed enhanced absorption of blood cells and proteins. The mesoporous SBA-15 with pore size of 5.3 nm displayed intermediate properties between the two materials. The in vivo experiments showed that among the three kinds of porous silica, the MCM-41 provided the highest pro-coagulant capacity in the tail transection rat model with minor bleeding, and the MSF performed the best hemostatic effect in the femoral artery injury rat model with spurting hemorrhage. Our study elucidates the role of pore structure of porous silica as hemostats, which may give hint to the design of such materials.
研究领域:
生物医学工程
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材料科学
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血液学
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产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
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2015
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IF 2.467
Chunyan Sun,Feng Zhang,Aili Wang,Shengfang Li,Fangqin Cheng
Aluminum-containing hexagonally ordered mesoporous silica , Al-MCM-41, was successfully synthesized for the first time using natural clay from low-grade potash ores of a salt lake in Qinghai, China, through liquid-phase transport. Synthesis involved the use of impure natural clay, the principal components of which are kaolin and quartz, as a starting material to produce Al-MCM-41 directly without sedimentation processing; no additional silica or aluminum reagents were required in this process. The resultant product was characterized by X-ray fluorescence, X-ray diffraction, Fourier-transform infrared spectroscopy, N 2 adsorption/desorption isotherms, transmission electron microscopy , and 27 Al magic-angle spinning NMR. The adsorption capacity of the final product for removing octadecylamine in synthetic salt lake brine was also investigated. Results suggested that salt lake clay is a promising low-cost precursor for the industrial production of mesoporous aluminosilicate .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF BIOMATERIALS APPLICATIONS
·
2024
·
IF 2.3
Bingru Zheng,Jinjie Chen,Yizhou Xu,Wanrui Wu,Yu Zhu,Wei Cai,Weili Lin,Changsheng Shi
Introduction: Deep vein thrombosis (DVT) is a major cause of cardiovascular disease-related deaths worldwide and is considered a thrombotic inflammatory disorder. IL-1β, as a key promoter of venous thrombus inflammation, is a potential target for DVT treatment. Constructing a nanocarrier system for intracellular delivery of siIL-1β to silence IL-1β may be an effective strategy for alleviating DVT. Methods: ELISA was used to detect the expression levels of IL-1β and t-PA in the serum of DVT patients and healthy individuals. In vitro, HUVEC cells were treated with IL-1β, and changes in VWF and t-PA expression levels were assessed. PBAE/MCM-41@siIL-1β (PM@siIL-1β) nano-complexes were synthesized, the characterization and biocompatibility of PM@siIL-1β were evaluated. A rat hind limb DVT model was established, and PM@siIL-1β was used to treat DVT rats. Morphology of the inferior vena cava, endothelial cell count, IL-1β, vWF, and t-PA levels, as well as changes in the p38 MAPK and NF-κB pathways, were examined in the different groups. Results: IL-1β and t-PA were highly expressed in DVT patients, and IL-1β treatment induced a decrease in VWF levels and an increase in t-PA levels in HUVEC cells. The synthesized PM@siIL-1β exhibited spherical shape, good stability, high encapsulation efficiency, and high drug loading capacity, with excellent biocompatibility. In the DVT model rats, the inferior vena cava was filled with blood clots, endothelial cells increased, IL-1β and VWF levels significantly increased, while t-PA levels were significantly downregulated. Treatment with PM@siIL-1β resulted in reduced thrombus formation, decreased endothelial cell count, and reversal of IL-1β, VWF, and t-PA levels. Furthermore, PM@siIL-1β treatment significantly inhibited p38 phosphorylation and upregulation of NF-κB expression in the DVT model group. Conclusion: IL-1β can be considered a therapeutic target for suppressing DVT inflammation. The synthesized PM@siIL-1β achieved efficient delivery and gene silencing of siIL-1β, demonstrating good therapeutic effects on rat hind limb DVT, including anti-thrombotic and anti-inflammatory effects, potentially mediated through the p38 MAPK and NF-κB pathways.
研究领域:
医学
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药理学
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分子生物学
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DOI
高影响因子
Acta Geochimica
·
2019
·Vol. 38
·期 4
·517-529
·
IF 0
Niu Yanhui,Yu Wenbin,Qin Zonghua,Nie Xin,Yang Shuguang,Wan Quan
Adsorption by nanoporous media is critically involved in many fundamental geological and geochemical processes including chemical weathering, element migration and enrichment, environmental pollution, etc. Yet, the adsorption behavior of metal ions on nanoporous materials has not been systematically investigated. In this study, MCM-41 material with a monodisperse pore size (4.4 nm) and a large BET specific surface area (839 m 2 /g) was hydrothermally prepared and used as a model silica adsorbent to study the adsorption characteristics of Cu 2+ as a representative metal ion. The Cu 2+ adsorption capacity was found to increase with increasing suspension pH in the range from 3 to 5 and to decrease in the presence of NaNO 3 . At 25 °C, pH = 5, and a solid-to-liquid ratio of 5 g/L, the adsorption capacity was determined to be 0.29 mg/g, which can be converted to a dimensionless partition coefficient of 45, indicating a strong enriching effect of nanoporous silica. The adsorption isotherm and kinetic data were fitted to several commonly used thermodynamic, kinetic, and diffusion models. The adsorption mechanism was also studied by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and synchrotron-based X-ray absorption spectroscopy. The results suggest that Cu 2+ ion adsorption is an entropy-driven endothermal process, possibly involving both outer-sphere and inner-sphere complexes.
研究领域:
环境科学
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地球化学
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材料科学
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产品关联
DOI
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2021
·Vol. 100
·期 7
·1558-1568
·
IF 2.007
Jian Chen,Mengjing Zhu,Fuwei Xiang,Junfeng Li,Hongjun Yang,Zhipeng Mao,Ganggang Chang,Shaoping Li
(2-methyl-6-ethylphenyl)-1-methoxypropyl-2-imine (MEMI) is an important intermediate for the synthesis of commercial pesticide S-metolachlor. However, the research on heterogeneously catalytic kinetics of MEMI, and further the catalytic distillation simulation aiming at continuous operation, have never been reported. Herein, the catalytic kinetics for the synthesis of MEMI by HPW/Al-MCM-41 have been systematically investigated, and further fitted by using a pseudo-homogeneous kinetic model, based on which, the reaction equilibrium constant, activation energy, and rate constant are obtained. Furthermore, simulation of the continuous process of MEMI synthesis was carried out using the software Aspen Plus V10. Sensitivity analysis of operating parameters such as feed stage, distillation rate, number of reactive theoretical stages, and the best operating conditions were also obtained. An excellent product purity (>98.9%) of MEMI could be achieved when operated at the optimum conditions. Compared with the batch method, catalytic distillation provided continuous synthesis of MEMI, and the reaction was more thorough, achieving process integration and optimization. Our results provide substantial theoretical and empirical supports for the industrial synthesis of MEMI.
研究领域:
化学工程
·
催化反应工程
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 3
·953-957
·
IF 2.911
Wang Tingting,Wang Zhiming,Zhao Junjing,Yu Qing,Wang Zhongwei
2,4,6-Trimethylbenzoyldipenylphosphine oxide (TPO) is an important photoinitiator, nevertheless some drawbacks exist in its synthesis. So V/MCM-41 catalysts were designed. Compared with commonly used VO(acac) 2 , V/MCM-41 catalysts exhibited excellent TPO yield (92.5%), which makes the usage of inorganic vanadium possible and is benefit both in academic and in industry. Graphical
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DOI
高影响因子
Science China-Chemistry
·
2019
·Vol. 62
·期 12
·1710-1719
·
IF 6.085
Wang Guishuo,Luo Ran,Yang Chengsheng,Song Jimin,Xiong Chuanye,Tian Hao,Zhao Zhi-Jian,Mu Rentao,Gong Jinlong
Metal oxide-promoted Rh-based catalysts have been widely used for CO 2 hydrogenation, especially for the ethanol synthesis. However, this reaction usually suffers low CO 2 conversion and alcohols selectivity due to the formation of byproducts methane and CO. This paper describes an efficient vanadium oxide promoted Rh-based catalysts confined in mesopore MCM-41. The Rh-0.3VO x /MCM-41 catalyst shows superior conversion (~12%) and ethanol selectivity (~24%) for CO 2 hydrogenation. The promoting effect can be attributed to the synergism of high Rh dispersion by the confinement effect of MCM-41 and the formation of VO x -Rh interface sites. Experimental and theoretical results indicate the formation of til-CO at VO x -Rh interface sites is easily dissociated into *CH x , and then *CH x can be inserted by CO to form CH 3 CO*, followed by CH 3 CO* hydrogenation to ethanol.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）