X-Ray absorption and photoelectron spectroscopic investigation of vanadium interaction with NH4+- and Eu3+-exchanged zeolite-Y following calcination and steam treatment

Agasi, Lorenza; Berry, Frank J.; Carbucicchio, M.; Marco, José F.; Mortimer, Michael; Vetel, F.F

doi:10.1039/b205533n

Cited by 8 publications

(3 citation statements)

References 29 publications

(50 reference statements)

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“…But it is allowed in the case of non-centrosymmetric systems due to hybridization between V 3d and O 2p states. [28][29][30][31][32][33] The K-edge energies were found to be 5484, 5490, 5490 eV for V 2 O 3 , V 2 O 5 -B and (V 1.95 Ta 0.05 )O 5 , respectively. The compounds V 2 O 5 -B and (V 1.95 Ta 0.05 )O 5 were found to have a higher energy of absorption when compared to the standard V 2 O 3 .…”

Section: X-ray Absorption Near Edge Structure Studiesmentioning

confidence: 99%

Energy storage studies of bare and doped vanadium pentoxide, (V1.95M0.05)O5, M = Nb, Ta, for lithium ion batteries

Sakunthala

Reddy

Selvasekarapandian

et al. 2011

Energy Environ. Sci.

124

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The bare V 2 O 5 and doped (V 1.95 M 0.05 )O 5 (M ¼ Nb, Ta) nano/submicron sized compounds were prepared by the simple polymer precursor method. The compounds were characterized by different physical and electroanalytical techniques. The effects of doping and different synthesis conditions on the energy storage performance of the V 2 O 5 compounds were discussed. All compounds delivered a discharge capacity (at the end of the 2 nd cycle) in the range 245 to 261 (AE3) mA h g À1 , except for the tantalum doped compound (V 1.95 Ta 0.05 )O 5 which exhibited a discharge capacity of 210 (AE3) mA h g À1 , cycled in the range 2.0-4.0 V at a current rate of 120 mA g À1 . An excellent cycling stability of 96% till twenty cycles was achieved for the compound V 2 O 5 prepared by the polymer precursor method. Electrochemical impedance spectroscopy studies at different voltages during discharge and charge cycles were discussed in detail.

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Section: X-ray Absorption Near Edge Structure Studiesmentioning

confidence: 99%

Energy storage studies of bare and doped vanadium pentoxide, (V1.95M0.05)O5, M = Nb, Ta, for lithium ion batteries

Sakunthala

Reddy

Selvasekarapandian

et al. 2011

Energy Environ. Sci.

124

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show abstract

“…Normally, in order to achieve the preferred Si/Al ratio, hydrothermal synthesis in the presence of organic structure-directing agent (OSDA) and post-treatment synthesis by alumination/dealumination process have been adopted. In the past decades, dealumination of zeolites with steaming, − acid, , and fluoride reagents such as (NH 4 ) 2 SiF 6 , HF, and NH 4 F has been employed. − Except for the case of steam, the high pressure, high treatment temperature, long time, and complicated procedure limit its wide application. Obviously, although the fluoride reagents can easily cause dealumination of zeolites, the uses of these reagents have the same problem of environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Aluminum Fluoride Modified HZSM-5 Zeolite with Superior Performance in Synthesis of Dimethyl Ether from Methanol

et al. 2012

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A series of HZSM-5 catalysts modified with various loadings of aluminum fluoride (AlF3) were prepared from a mechanical mixture route. Combined characterizations of X-ray diffraction, Fourier transform infrared (FT-IR), 27Al, 29Si, 19F MAS NMR, N2 sorption, and NH3-tempeature-programmed desorption (NH3-TPD) techniques show that the structure, texture, and acidity of HZSM-5 catalysts can be adjusted with the loading of AlF3. A suitable amount of AlF3 modification (2 wt %) could increase the framework aluminum content and the surface area of HZSM-5. However, when the loading of AlF3 came to 3 wt % or more, the contrary results were obtained, which could be ascribed to the dealumination of the zeolitic framework. The catalytic activities for dehydration of methanol to dimethyl ether (DME) show that suitable amount of AlF3-modified HZSM-5 exhibited much higher activity and better stability than parent HZSM-5. The combination of “tunable” synthesis and “superior” properties is very much valuable in the academic and industry.

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“…Table 1). the availability of non-bridging O 2− should remove the stress on V-O a bond [4,[15][16][17][18] producing the change in structure of VO 2+ ion confirmed by g || / g ⊥ values. Thus, the V 4+ tends to become more regularly octahedral with increasing basicity of melt.…”

Section: Resultsmentioning

confidence: 98%

An EPR characterization of vanadium in CaO and Na2O based Al2O3–SiO2 glasses

Farah

2008

Journal of Alloys and Compounds

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X-Ray absorption and photoelectron spectroscopic investigation of vanadium interaction with NH4+- and Eu3+-exchanged zeolite-Y following calcination and steam treatment

Cited by 8 publications

References 29 publications

Energy storage studies of bare and doped vanadium pentoxide, (V1.95M0.05)O5, M = Nb, Ta, for lithium ion batteries

Energy storage studies of bare and doped vanadium pentoxide, (V1.95M0.05)O5, M = Nb, Ta, for lithium ion batteries

Aluminum Fluoride Modified HZSM-5 Zeolite with Superior Performance in Synthesis of Dimethyl Ether from Methanol

An EPR characterization of vanadium in CaO and Na2O based Al2O3–SiO2 glasses

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