Nanoscale metal fluorides: a new class of heterogeneous catalysts

Kemnitz, Erhard

doi:10.1039/c4cy01397b

Cited by 69 publications

(50 citation statements)

References 160 publications

(193 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such an interaction would allow electrophilic activation of methane and reversible cleavage of the CÀHb ond by protonation of [D 6 ]benzene, [D 8 ]toluene, or [D 12 ]cyclohexane (Scheme2). [17] Comparable reaction pathways have been suggested for methane activation reactions at zeolites. [17] Comparable reaction pathways have been suggested for methane activation reactions at zeolites.…”

Section: Figurementioning

confidence: 99%

Hydrogen/Deuterium‐Exchange Reactions of Methane with Aromatics and Cyclohexane Catalyzed by a Nanoscopic Aluminum Chlorofluoride

2017

Self Cite

View full text Add to dashboard Cite

H/D-exchange reactions between methane and deuterated solvents such as [D 6 ]benzene and [D 12 ]cyclohexane were heterogeneouslyc atalyzed by nanoscopic aluminum chlorofluoride (ACF = AlCl x F 3Àx , x % 0.05-0.3) under very mild conditions. 13 CNMR spectroscopy experiments at labeled methane revealed the formationo fa ll isotopologues. AlCl 3 ,A lBr 3 ,H S-AlF 3 , g-Al 2 O 3 ,a nd g-Al 2 O 3 preheated at 700 8Cd id not show any H/D-exchange reactionofmethane or [D 6 ]benzene. Mechanistically,e lectrophilic activation of methane was suggesteda tt he ACF surface.

show abstract

Section: Figurementioning

confidence: 99%

Hydrogen/Deuterium‐Exchange Reactions of Methane with Aromatics and Cyclohexane Catalyzed by a Nanoscopic Aluminum Chlorofluoride

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…During aging, Mg 1-x Cu x FOH formed a network because of the strong tendency of F atom to act as a bridge between metal atoms [3]. The process kept going until a stable gel of Mg 1-x Cu x FOH was formed.…”

Section: Synthesis Of Mg 1-x Cu X Foh Samplesmentioning

confidence: 99%

“…This process is a modification of sol-gel method and also known as fluorolytic sol-gel. The simplified chemical pathway of the fluorolytic sol-gel is given by equation 1 [3].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Cu doped magnesium hydroxide fluoride, Mg1-xCuxFOH

Rosyadi¹,

Murwani²

2017

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract.A series of Cu doped magnesium hydroxide fluoride, Mg 1-x Cu x FOH, were synthesized via sol-gel method followed by vacuum drying. The characterization of synthesized solids with XRD revealed the presence of an X-ray amorphous phase of the samples and appearance of some humps. FTIR spectra of solids synthesized showed a band at 3700 cm -1 which is an isolated OH group, wide band at 3750-3000 cm -1 supported by the peak at 1650 cm -1 indicated the presence of absorbed water on the surface. Characteristic peaks for Mg-F and Mg-O vibrations were seen at 500-400 cm -1 and 600-500 cm -1 respectively.

show abstract

“…Among these catalysts, metal fluorides are the promising catalysts in a corrosive atmosphere (HF) and elevating temperature conditions. Aluminum fluoride catalysts is a representative catalyst for dehydrofluorination due to its surface acidity which is key to the catalysis . Miller et al used the AlF 3 catalysts to the dehydrofluorination of 1, 1, 1, 2, 2‐pentafluoropropane (HFC‐245cb), and the catalyst activity was very unstable.…”

Section: Introductionmentioning

confidence: 99%

“…Aluminum fluoride catalysts is a representative catalyst for dehydrofluorination due to its surface acidity which is key to the catalysis. [12] Miller et al used the AlF 3 catalysts to the dehydrofluorination of 1, 1, 1, 2, 2-pentafluoropropane (HFC-245cb), [13] and the catalyst activity was very unstable. Also, Uenveren et al investigated comparatively the dehydrofluorination of 1, 1, 1, 2-tetrafluoroethane over AlF 3 and AlF 3 -Al 2 O 3 catalysts, respectively, AlF 3 -Al 2 O 3 catalysts have a higher initial activity but a weaker catalytic stability owing to carbon deposition or coke.…”

Section: Introductionmentioning

confidence: 99%

A Novel Ni/NiF₂‐AlF₃ Catalyst with Mild‐Strength Lewis Acid Sites for Dehydrofluorination of 1, 1, 1, 2‐Tetrafluoroethane to Synthesize Trifluoroethylene

Liu

et al. 2019

ChemistrySelect

View full text Add to dashboard Cite

A novel Ni/NiF2‐AlF3 catalyst was prepared by impregnation and following vapor hydrofluorination, and it was used to dehydrofluorination of tetrafluoroethane to trifluoroethylene. BET, SEM, XRD, XPS, NH3‐TPD and Py‐IR techniques were employed to characterize the Ni/NiF2‐AlF3 catalysts. Based on the NH3‐TPD results, it was interestingly found that the strong acidic sites of Ni/NiF2‐AlF3 catalyst transformed into the mid‐strength acidic sites with the increase of Ni loading, attributing to the roles of Ni on the catalyst surface. Compared with the NiF2‐AlF3 catalyst, the added Ni particles can improve the catalyst activity and stability for dehydrofluorination of 1, 1, 1, 2‐tetrafluoroethane. The best performance was obtained at Al/Ni=2 over the Ni/NiF2‐AlF3 catalyst, with high trifluoroethylene selectivity(99%) and CF3CFH2 conversion of 21.3%, after the reaction for 20 h on‐time stream at 500 °C, which showed the better application possibility as a heterogeneous dehydrofluorination catalyst. It was suggested that catalytic performance was related with the mid‐strength Lewis acidity on the catalyst surface. And the Ni/NiF2‐AlF3 catalyst (Al/Ni=2) possessed the good catalytic stability due to the mild‐strength Lewis acid sites.

show abstract

Nanoscale metal fluorides: a new class of heterogeneous catalysts

Abstract: Nanoscale metal fluorides and hydroxide fluorides prepared according the fluorolytic sol–gel synthesis represent a powerful class of bi-acidic heterogeneous catalysts.

Cited by 69 publications

References 160 publications

Hydrogen/Deuterium‐Exchange Reactions of Methane with Aromatics and Cyclohexane Catalyzed by a Nanoscopic Aluminum Chlorofluoride

Hydrogen/Deuterium‐Exchange Reactions of Methane with Aromatics and Cyclohexane Catalyzed by a Nanoscopic Aluminum Chlorofluoride

Synthesis and characterization of Cu doped magnesium hydroxide fluoride, Mg1-xCuxFOH

A Novel Ni/NiF₂‐AlF₃ Catalyst with Mild‐Strength Lewis Acid Sites for Dehydrofluorination of 1, 1, 1, 2‐Tetrafluoroethane to Synthesize Trifluoroethylene

Contact Info

Product

Resources

About

Nanoscale metal fluorides: a new class of heterogeneous catalysts

Abstract: Nanoscale metal fluorides and hydroxide fluorides prepared according the fluorolytic sol–gel synthesis represent a powerful class of bi-acidic heterogeneous catalysts.

Cited by 69 publications

References 160 publications

Hydrogen/Deuterium‐Exchange Reactions of Methane with Aromatics and Cyclohexane Catalyzed by a Nanoscopic Aluminum Chlorofluoride

Hydrogen/Deuterium‐Exchange Reactions of Methane with Aromatics and Cyclohexane Catalyzed by a Nanoscopic Aluminum Chlorofluoride

Synthesis and characterization of Cu doped magnesium hydroxide fluoride, Mg1-xCuxFOH

A Novel Ni/NiF2‐AlF3 Catalyst with Mild‐Strength Lewis Acid Sites for Dehydrofluorination of 1, 1, 1, 2‐Tetrafluoroethane to Synthesize Trifluoroethylene

Contact Info

Product

Resources

About

A Novel Ni/NiF₂‐AlF₃ Catalyst with Mild‐Strength Lewis Acid Sites for Dehydrofluorination of 1, 1, 1, 2‐Tetrafluoroethane to Synthesize Trifluoroethylene