Real sol-gel synthesis of catalytically active aluminium fluoride

Rüdiger, Stephan; Eltanany, Gehan; Groß, U.; Kemnitz, Erhard

doi:10.1007/s10971-006-9008-0

Cited by 75 publications

(101 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the first step, a precursor of metal fluoride is prepared by mixing organic solutions of anhydrous hydrogen fluoride (HF) and a metal salt (alkoxides, nitrates, or chlorides) followed by removal of organics in vacuo. In the second step, the obtained precursor is fluorinated by a fluorine containing gas at elevated temperatures to form metal fluoride [27][28][29][30][31][32]. Several studies reported the effects of synthetic conditions on the structural properties of AlF 3 [29] and MgF 2 [30].…”

Section: Introductionmentioning

confidence: 99%

“…In the second step, the obtained precursor is fluorinated by a fluorine containing gas at elevated temperatures to form metal fluoride [27][28][29][30][31][32]. Several studies reported the effects of synthetic conditions on the structural properties of AlF 3 [29] and MgF 2 [30]. Although there is a report on synthesis of FeF 3 by a fluorolysis method under anhydrous conditions [32], detailed effects of synthetic conditions to the product are remained unclear.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Iron(III) fluoride synthesized by a fluorolysis method and its electrochemical properties as a positive electrode material for lithium secondary batteries

Tawa

Yamamoto

Matsumoto

et al. 2016

Journal of Fluorine Chemistry

View full text Add to dashboard Cite

Iron(III) fluoride (FeF 3 ) with low crystallinity and high surface area has been synthesized by a fluorolysis method, and applied as a positive electrode material for lithium secondary batteries. The FeF 3 prepared with a high molar ratio of hydrogen fluoride exhibits a high surface area and crystallinity. The FeF 3 sample treated at 300 °C under a F 2 /Ar atmosphere exhibits the highest surface area and was selected for further electrochemical test in view of improvement of performance in the potential region of conversion reactions. The initial discharge (lithiation) capacity was 676 mAh g −1 that was close to the theoretical capacity of FeF 3 (712 mAh g −1 ).Compared to the highly crystalline FeF 3 commercially available, the synthesized FeF 3 in the present study exhibited a low discharge capacity attributed to the insertion reaction because of the low crystallinity, and showed a low overpotential and larger capacity corresponding to the conversion reaction owing to the higher surface area of the fluorides.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Iron(III) fluoride synthesized by a fluorolysis method and its electrochemical properties as a positive electrode material for lithium secondary batteries

Tawa

Yamamoto

Matsumoto

et al. 2016

Journal of Fluorine Chemistry

View full text Add to dashboard Cite

show abstract

“…Particular properties of these materials are the significantly increased Lewis acidity in comparison to conventionally prepared metal fluorides. For example, high surface area (HS-) AlF 3 is one of the strongest known solid Lewis acids [5][6]. Another interesting example is MgF 2 which usually is a neutral solid.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel prepared nanoscopic metal fluorides – a new class of tunable acid–base catalysts

et al. 2010

View full text Add to dashboard Cite

In this article, the high potential of the fluorolytic sol-gel process to synthesise nanoscopic metal fluorides with different acid-base properties is shown. These nanoscopic materials exhibit high potential to be used as heterogeneous catalysts due to their high surface areas and their tunable surface properties. Thus, for each specific reaction the required surface properties of the catalysts can be "adjusted" to achieve a high yield and selectivity of the desired product. As a consequence, a greener method of chemical production can be accomplished. Moreover the cheap and easy synthesis of the catalysts using basic chemicals makes them not only interesting for fundamental research but provides an easy transformation to industrial applications.

show abstract

“…[9] By adding a stoichiometric amount of HF in the form of its aqueous solution not only Lewis but also Brønsted acid sites can be introduced in the solid cat-alyst because of partial hydrolysis of the M À OR bond resulting in M À OH bond formation [Eq. (1)].…”

mentioning

confidence: 99%

Catalytic Performance of Nanoscopic, Aluminium Trifluoride‐Based Catalysts in the Synthesis of (all‐rac)‐α‐Tocopherol

et al. 2008

View full text Add to dashboard Cite

A novel nanoscopic, partly hydroxylated aluminium fluoride was prepared in a sol-gel fluorination synthesis and characterised by IR probe molecules. It was shown that this material has, in contrast to high surface area aluminium fluoride (HSAlF 3 ) which is one of the strongest Lewis acids, a low amount of strong Lewis acid sites combined with weak and medium strength Brønsted sites. Both materials were tested in the synthesis of (allrac)-a-tocopherol through the condensation of 2,3,6-trimethylhydroquinone (TMHQ) with isophytol (IP). The activity data indicate the partly hydroxylated aluminium fluoride to be a very efficient and highly selective catalyst for (all-rac)-a-tocopherol (> 99.9%, for an IP conversion of 100%) whereas high surface area aluminium fluoride is a poor catalyst for this reaction.

show abstract

Real sol-gel synthesis of catalytically active aluminium fluoride

Cited by 75 publications

References 11 publications

Iron(III) fluoride synthesized by a fluorolysis method and its electrochemical properties as a positive electrode material for lithium secondary batteries

Iron(III) fluoride synthesized by a fluorolysis method and its electrochemical properties as a positive electrode material for lithium secondary batteries

Sol–gel prepared nanoscopic metal fluorides – a new class of tunable acid–base catalysts

Catalytic Performance of Nanoscopic, Aluminium Trifluoride‐Based Catalysts in the Synthesis of (all‐rac)‐α‐Tocopherol

Contact Info

Product

Resources

About