Papers by Keyword: Sepiolite

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Authors: Shi Chun Mu, M. Pan, Run Zhang Yuan
Abstract: Some minerals were considered to store hydrogen on the basis of their porous crystal structure. Besides of crystal graphite and zeolite, some natural clay minerals such as palygorskite-sepiolite minerals with nano-scale channels and polar surface can also store hydrogen. The hydrogen storage mechanism of porous minerals was discussed. The experimental results showed a potential application of palygorskite-sepiolite minerals as the media of hydrogen storage.
2441
Authors: Shu Qin Zheng, Shao Ren, Jian Ce Zhang, Wei Zhu
Abstract: A novel Y zeolite-containing composite material was prepared via in situ crystallization with sepiolite and catalyst residue as starting materials, of which the BET surface area is up to 582 m2/g, the pore volume is 0.43 cm3/g, the relative crystallinity is as high as 55.7 %, the surface is smooth and regular, and Y zeolite particles are in the range of 0.4-1.0 mirons, the composite contains large number Y zeolite with more meso-macro porous structure.The alkalinity in reaction medium has a pronounced effect on the relative crystallinity of Y zeolite.
32
Authors: Qing Ye, Hai Ping Wang, Hai Xia Zhao, Shui Yuan Cheng, Tian Fang Kang
Abstract: Cu supported on acid-treated sepiolite catalysts (xCu/H-Sep, x = 0  20.0 wt%) or Cu-Fe mixed supported on acid-treated sepiolite catalysts (yFe-10Cu/H-Sep, y = 0  20.0 wt%) were prepared by the incipient wetness impregnation method. The xCu/H-Sep and yFe-10Cu/H-Sep catalysts were characterized by means of XRD, BET, XRF, XPS, and H2-TPR techniques, and their catalytic activities were evaluated for the SCR of NO with propylene. XPS and XRD results indicate that there was the co-presence of Cu+-Cu2+ and Fe2+-Fe3+ over the surfaces of yFe-10Cu/H-Sep catalysts, and there was a strong interaction between Cu, Fe and sepiolite. High promotional effect of iron additive on the catalytic performance of Cu/H-Sep catalyst were found in C3H6-SCR of NO reaction. The highest activity of 65% NO conversion was obtained over 15Fe-10Cu/H-Sep catalyst at 280 oC under the condition of 1000 ppm NO, 1000 ppm C3H6, and 5% O2. The high catalytic activity of 15Fe-10Cu/H-Sep catalyst for NO reduction was due to its high reducibility to activate C3H6 to selectively reduce NO in the presence of excess O2. The high dispersion of copper oxides and strong metal-support interaction over 15Fe-10Cu/H-Sep catalyst also improve its catalytic performance.
281
Authors: Zhao Du, Bin Bin Yang, Er Hong Duan, Bin Guo
Abstract: In this work, the breakthrough curves of styrene in fixed beds packed separately with hydrochloric acid-modified sepiolite were determined. And the Temperature Programmed Desorption (TPD) method is applied to research the desorption activation energy on modified sepiolite and untreated sepiolite. The results showed that in compared with the original sepiolite, the hydrochloric acid-modified sepiolite had more surface basic groups, pore volume and higher surface area so that their adsorption capacities of styrene were improved. The sepiolite modified with 12% hydrochloric acid solution had more micropore volume and higher surface area than the other modified sepiolite, and thus its adsorption capacity of styrene was the highest. The activation energy for desorption of styrene on the modified is higher than on the original sepiolite, this show that using hydrochloric acid modified sepiolite can enhance its adsorption of styrene.
2058
Authors: Fei Wang, Lei Feng, Meng Ran Tang, Ji Yuan Li, Qing Guo Tang
Abstract: Sepiolite mineral nanofibers are typical porous materials widely existing in nature and have many nanometer level micropore and mesopore, which could play an active role in many fields such as thermal insulation functional additive for composite materials. Based on the above reason, this paper briefly summarized the research progress of microstructure of sepiolite mineral nanofibers, and research orientations related to microstructure of sepiolite mineral nanofibers were also proposed.
389
Authors: Fei Wang, Lei Feng, Meng Ran Tang, Ji Yuan Li, Qing Guo Tang
Abstract: Synthetic nanomaterials have the disadvantages of large-scale investment, high energy consumption, complex production process and heavy environmental load. Mineral nanomaterials such as sepiolite group mineral nanomaterials are characterized by small size effect, quantum size effect and surface effect. Water treatment application of sepiolite group mineral nanomaterials has become an active research area and showed good development and application prospects. Based on the above reasons, this paper systematically summarizes the water treatment application of sepiolite group mineral nanomaterials, and development trend related to water treatment application of sepiolite group mineral nanomaterials were also proposed.
217
Authors: Yun Fang Qi, Yang Li, Zhi Hao Zhang, Li Sha Liu, Qing Ye, Dao Wang
Abstract: H-Sep samples were taken from treating sepiolite with HCl solution. Cu/H-Sep samples were prepared by the incipient wetness impregnation method. The samples were characterized using XRF, XRD, and XPS techniques, and their catalytic activities were performed by the SCR of NO with propylene. The results show that the Cu/H-Sep catalyst exhibited the high performance in the C3H6-SCR of NO. After investigation by XRD and H2-TPR, the result showed that there are Cu2+/Cu+ redox species as a reaction activity center over Cu/H-Sep.
976
Authors: Zhi Hao Zhang, Yang Li, Yun Fang Qi, Qing Ye, Shu Lan Ji, Dao Wang
Abstract: Cu/Na-Sep samples were prepared by the incipient wetness impregnation method. These catalysts were characterized by means of XRF, XRD, and XPS techniques, and their catalytic activities were performed by the SCR of NO with propylene. The results show that the Cu/Na-Sep catalyst exhibited the high performance in the C3H6-SCR of NO. After investigation by XRD and XPS, the result showed that there are Cu2+/Cu+ redox species as a reaction activity center over Cu/Na-Sep.
569
Authors: Zhi Yong Zeng, Zheng Wu Jiang
Abstract: Effect of acidizing conditions such as hydrochloric acid concentration, acidizing temperature and acidizing time etc. on moisture adsorption and desorption properties of sepiolite in closed space at constant temperature was studied. Relationships between moisture adsorption and desorption properties and microstructure of treated and untreated sepiolite were discussed by means of microscopic testing methods such as X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM)and Brunauer-Emmett-Teller (BET). The results indicated that acidizing conditions had significant effect on moisture adsorption and desorption properties and microstructure of sepiolite in closed space. The optimum acidizing condition in this experimental program was obtained by treatment with 5 wt.% hydrochloric acid at 98 °C for 9 h. Fibers in the treated sepiolite become thinner and shorter, and carbonates in layers and pore canals were dissolved. Specific surface of sepiolite treated with the optimum acidizing condition increases from 35.64 m2/g to 84.86 m2/g ,and its average pore diameter decreases from 16.84 nm to 12.68 nm.
1159
Authors: Hossein Cheraghi Bidsorkhi, Zurina Mohamad
Abstract: Ethylene Vinyl Acetate (EVA)/Sepiolite nanocomposites were prepared by melt extrusion using a counter-rotating twin-screw extruder followed by injection molding. Sepiolite was loaded in EVA is varies at 1, 3, 5 and 7 wt%. The mechanical properties of EVA/Sepiolite nanocomposites were studied through tensile test. The flame retardancy of nanocomposites were studied for limiting oxygen index (LOI). LOI tests show that the flame retardancy of nanocomposites were increased with increase ratio of sepiolite in EVA/Sepiolite nanocomposite. The tensile properties of EVA/Sepiolite nanocomposites were also increased with increased Sepiolite content in nanocomposites.
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