A simple aqueous phase synthesis of high surface area aluminum fluoride and its bulk and surface structure

Kleist, Wolfgang; Haeßner, Carmen; Storcheva, Oksana; Köhler, Klaus

doi:10.1016/j.ica.2006.07.105

Cited by 25 publications

(17 citation statements)

References 28 publications

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“…[22] To obtain water-free AlF 3 , the samples were thermally treated at 450 8C. The specific surface area was reduced to 60 m 2 g À1 by this treatment, which is in good agreement with the literature.…”

Section: Characteristics Of Aluminum Fluoride Alfsupporting

confidence: 84%

“…In the last few years, a number of useful methods have been reported for the synthesis of polycrystalline and amorphous AlF 3 materials with comparatively high specific surface areas of approximately 100 m 2 g À1 . [19][20][21][22] In addition, vanadium oxide supported on and doped into alumina and AlF 3 have been reported to show interesting catalytic properties, including increased selectivity of the VO x /AlF 3 catalysts in selective oxidation reactions (e.g., ODH of propane) that could be related, for example, to the different surface acidity of alumina and AlF 3 . [23,24] The catalysts were prepared by sol-gel methods and had vanadium contents > 5 wt %.…”

Section: Introductionmentioning

confidence: 99%

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Isolated Vanadium Surface Complexes on Aluminum Fluoride ‐ A Model for the Relevance of Oxygen Atoms of Aluminum Oxide Supports in Catalytic Oxidation Reactions

et al. 2013

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The redox properties and reactivity of oxidation catalysts of isolated mononuclear oxovanadium complexes supported on aluminum fluoride, AlF3, and on aluminum oxide, Al2O3, were compared. AlF3 is an interesting model for a non‐oxide support to study the role of oxygen atoms of nonreducible oxide supports during catalytic oxidation with supported vanadium oxide catalysts. Solid‐state 1H NMR indicate the presence of reactive FH and OH groups on the surface of AlF3 and the presence of reactive OH groups on the surface of Al2O3. Oxovanadium(V) triisopropoxide, VO(OiPr)3, was grafted onto the surfaces of both supports. Immobilization led to mononuclear vanadium complexes with oxidation states of +V (major) and +IV (minor). In contrast to alumina, the vanadium surface species were neither reducible nor oxidizable on AlF3. Redox cycles were studied by electron paramagnetic resonance of vanadium(IV). In situ IR spectroscopic investigations showed high and comparable initial stoichiometric reactivity to propane for both catalysts. Reactions on AlF3 stopped after a short initial period as a result of the absence of surface oxygen of the support. The results indicate the relevance of surface oxygen of the alumina support in oxidation reactions. In contrast to vanadium on alumina, VOx/AlF3 is catalytically inactive in the oxidative dehydrogenation of propane. Only after partial oxidation of AlF3 to Al2O3 above 500 °C was catalytic activity observed. The investigations support a recent report contradicting common oxygen‐exchange models, which assume the involvement of only surface vanadium oxide layers, and thus it appears as though a more complex process is in operation.

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Section: Characteristics Of Aluminum Fluoride Alfsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Isolated Vanadium Surface Complexes on Aluminum Fluoride ‐ A Model for the Relevance of Oxygen Atoms of Aluminum Oxide Supports in Catalytic Oxidation Reactions

et al. 2013

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“…According to a study conducted by Wu et al,2015, no deviations in the bulk structure of the AlF 3 coated material was observed which suggests the absence of any intrinsic structural defects after coating. This concept was also confirmed by work done by Liu et al; where the AlF 3 coating improved the spinel structure of LiMn 2 O 4 [15]. Likewise, the addition of reduced graphene oxide as a supportive platform contributes significantly to the stable electrochemistry of LiMn 2 O 4 .…”

Section: Introductionsupporting

confidence: 61%

Enhanced Electrochemistry of Carbon Supported Functionalized Nanocomposite Cathode for Aqueous Lithium‐ion Batteries

Willenberg

Ross

2020

Electroanalysis

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A novel carbon supported LiMn 2 O 4 nanocomposite framework has been explored to resolve multiple barriers associated with lithium manganese oxide cathodes for aqueous LIB systems. Here, we have successfully synthesized an architecturally stable AlF 3 À LiMn 2 O 4 /rGO composite with improved electron transfer kinetics and CV peak currents proportional to the square root of scan rate. The synergy between graphene and aluminium trifluoride enhances the intrinsic electrochemical properties of pristine LiMn 2 O 4 (LMO) and reduced Mn + 3 dissolution. The unique composite effectively reduced Li + diffusion distances with less polarization as it effectively accommodates the structural transformation during Li + ion charge and discharge. The electrochemical interrogation revealed faster charge transportation and decrease in charge transfer resistance due to inhibition of the pronounced pileup of Li + ions and undesired Mn 3 + ions on the surfaces. The electrochemical performances were tested in LiNO 3 aqueous electrolyte and the cell delivered a capacity of 90 mA h g À 1 based on the total weight of the active electrode materials. This aqueous LIB cathode system provides a promising alternative for safe, cost-effective and scalable energy storage with tolerance against misuse.

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“…The decrease in the intensity of 1040 cm −1 peak indicated the involvement of the Al-O bonds in the interaction with fluoride ions. The new broad peak in the region of 500-800 cm −1 is due to the Al-F stretching vibrations [31] which can be attributed to the complexation of fluoride ions with Al. These observations suggest possible interaction between fluoride and nano-alumina.…”

Section: Characterization Of Nano-aluminamentioning

confidence: 97%

Defluoridation from aqueous solutions by nano-alumina: Characterization and sorption studies

Kumar

Bhatnagar

Kumar

et al. 2011

Journal of Hazardous Materials

237

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A simple aqueous phase synthesis of high surface area aluminum fluoride and its bulk and surface structure

Cited by 25 publications

References 28 publications

Isolated Vanadium Surface Complexes on Aluminum Fluoride ‐ A Model for the Relevance of Oxygen Atoms of Aluminum Oxide Supports in Catalytic Oxidation Reactions

Isolated Vanadium Surface Complexes on Aluminum Fluoride ‐ A Model for the Relevance of Oxygen Atoms of Aluminum Oxide Supports in Catalytic Oxidation Reactions

Enhanced Electrochemistry of Carbon Supported Functionalized Nanocomposite Cathode for Aqueous Lithium‐ion Batteries

Defluoridation from aqueous solutions by nano-alumina: Characterization and sorption studies

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