Highly efficient gas-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane to 1,3,3,3-tetrafluoropropene over mesoporous nano-aluminum fluoride prepared from a polyol mediated sol-gel process

Mao, Wei; Bai, Yanbo; Jia, Zhaohua; Yang, Zhiqiang; Zhang, Hao; Lü, Jian

doi:10.1016/j.apcata.2018.07.028

Cited by 18 publications

(5 citation statements)

References 47 publications

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“…In catalyzing the Cl/F exchange reaction of CCl 2 F 2 and CHClF 2 , α-AlF 3 with a high surface area was more active than AlF 3 with a low specific surface area (25 m 2 g −1 ) for both disproportionated reactions. Mao et al 15 prepared nano-AlF 3 catalysts by a novel polyol-mediated sol−gel method. The results confirmed that nano-AlF 3 with larger specific surface areas and suitable acidity could provide higher catalytic activity (90%) and better stability for 1,1,1,3,3-pentafluoropropane dehydrofluorination reactions compared with the conventional AlF 3 and F−Cr 2 O 3 catalyst.…”

Section: Introductionmentioning

confidence: 99%

Carbon-Interacted AlF₃ Clusters as Robust Catalyst for Dehydrofluorination Reaction with Enhanced Undercoordination and Stability

Sun,

Wei,

Zhang

et al. 2024

ACS Catal.

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Conversion of potent greenhouse gases, hydrofluorocarbons (HFCs), to value-added hydrofluoroolefins (HFOs) is of great importance. AlF 3 catalysts play a major role in this process. Formation and maintenance under coordinated Al are the key to prepare efficient catalysts. Herein, carbon interacted AlF 3 nanoclusters catalyst (AlF 3 −SAPO-5) was effectively achieved with SAPO-5 molecular sieves as precursors via pyrolysis followed by in situ fluorination. This process results in a strong interaction between the carbonaceous material and active aluminum (Al) species. The results show that AlF 3 −SAPO-5 possesses both high activity and thermal stability. For 1,1-difluoroethane (HFC-152a) dehydrofluorination, the conversion can reach up to 95% at a reaction temperature of 350 °C. The reaction rate is almost 4 times higher than that of AlF 3 prepared by traditional pyrolysis (AlF 3 -py). It implies that the confinement effect contributes to the formation of AlF 3 nanoclusters with abundant 4-and 5-coordinated Al species stabilized by the F−Al−O−C structure. In addition, the carbon-interacted AlF 3 nanoclusters exhibit superb sintering resistance. Given its fantastic activity and thermal stability, the carbon-interacted AlF 3 nanoclusters show great potential for the catalytic dehydrofluorination of fluorinated alkanes.

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Section: Introductionmentioning

confidence: 99%

Carbon-Interacted AlF₃ Clusters as Robust Catalyst for Dehydrofluorination Reaction with Enhanced Undercoordination and Stability

Sun,

Wei,

Zhang

et al. 2024

ACS Catal.

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“…In the last decades, a lot of work has been devoted to the synthesis and characterization of metal fluorides due to their physical and chemical properties for many potential applications in catalysis, optics, energy conversion, and high- T c superconductors. − Among them, aluminum trifluoride AlF 3 is widely studied for applications such as cathode material coatings for batteries, , highly reflective mirrors, and optics . Due to its high Lewis acidity, AlF 3 is also of great interest as a heterogeneous catalyst for reactions such as halogen exchange, fluorination, dehydrofluorination of hydrofluorocarbons, − or hydrolysis of NF 3 …”

Section: Introductionmentioning

confidence: 99%

Controlled Morphology Synthesis of Nanostructured β-AlF_3–x(OH)_x with Tunable Specific Surface Area

Camus-Génot

Guiet

Lhoste

et al. 2021

Crystal Growth & Design

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“…At present, Al-based, [9,10] Mg-based, [11,12] and Cr-based [13,14] catalysts have been used to gas-phase dehydrofluorination of hydrofluorocarbons. Fang et al indicated that the pre-deposited carbon could improve the stability of AlF 3 catalyst.…”

Section: Introductionmentioning

confidence: 99%

Selective Dehydrofluorination of 1,1,1,3,3‐Pentafluoropropane to Synthesize Tetrafluoropropylene and Trifluoropropyne over the ZnO/Cr₂O₃ Catalysts

Jia

Fang

et al. 2020

ChemistrySelect

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A series of ZnO/Cr 2 O 3 catalysts were prepared by an impregnation method, and the promoted role of ZnO on the activity for selective dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF 3 CH 2 CHF 2) to tetrafluoropropylene (CFH=CHCF 3 and CH 2 =CFCF 3) and 3,3,3-trifluoropropyne (CH�CCF 3) was investigated. The ZnO/Cr 2 O 3 catalysts were characterized by XRD, Raman, BET, NH 3-TPD and XPS. As more Zn was loaded, both the crystallite size of the Cr 2 O 3 and the surface area of catalysts both increased. The surface acidity of catalysts was the highest (1.02 μmol g À 1) when 2 mol % of ZnO was added. Surface Cr species on the surface of ZnO/Cr 2 O 3 catalysts were identified, including Cr 2 O 3 , Cr(OH) 3 and CrO 3. As the ZnO content increased, the relative content of Cr 2 O 3 elevated, while the relative contents of Cr(OH) 3 and CrO 3 decreased. It was found that the selectivities to four products (EÀ CFH=CHCF 3 , Z-CFH=CHCF 3 , CH 2 =CFCF 3 and CH�CCF 3) were greatly affected by the ZnO loading and reaction temperature. For the 2ZnO/Cr 2 O 3 catalyst, the lowest selectivities to E-and Z-CFH=CHCF 3 were 61.2 and 15.7 %, respectively, while CH 2 =CFCF 3 and CH�CCF 3 achieved the highest selectivity (11.7 % and 9.8 %, respectively) at 450°C due to the highest surface acidity.

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Highly efficient gas-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane to 1,3,3,3-tetrafluoropropene over mesoporous nano-aluminum fluoride prepared from a polyol mediated sol-gel process

Cited by 18 publications

References 47 publications

Carbon-Interacted AlF₃ Clusters as Robust Catalyst for Dehydrofluorination Reaction with Enhanced Undercoordination and Stability

Carbon-Interacted AlF₃ Clusters as Robust Catalyst for Dehydrofluorination Reaction with Enhanced Undercoordination and Stability

Controlled Morphology Synthesis of Nanostructured β-AlF_3–x(OH)_x with Tunable Specific Surface Area

Selective Dehydrofluorination of 1,1,1,3,3‐Pentafluoropropane to Synthesize Tetrafluoropropylene and Trifluoropropyne over the ZnO/Cr₂O₃ Catalysts

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Highly efficient gas-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane to 1,3,3,3-tetrafluoropropene over mesoporous nano-aluminum fluoride prepared from a polyol mediated sol-gel process

Cited by 18 publications

References 47 publications

Carbon-Interacted AlF3 Clusters as Robust Catalyst for Dehydrofluorination Reaction with Enhanced Undercoordination and Stability

Carbon-Interacted AlF3 Clusters as Robust Catalyst for Dehydrofluorination Reaction with Enhanced Undercoordination and Stability

Controlled Morphology Synthesis of Nanostructured β-AlF3–x(OH)x with Tunable Specific Surface Area

Selective Dehydrofluorination of 1,1,1,3,3‐Pentafluoropropane to Synthesize Tetrafluoropropylene and Trifluoropropyne over the ZnO/Cr2O3 Catalysts

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Carbon-Interacted AlF₃ Clusters as Robust Catalyst for Dehydrofluorination Reaction with Enhanced Undercoordination and Stability

Carbon-Interacted AlF₃ Clusters as Robust Catalyst for Dehydrofluorination Reaction with Enhanced Undercoordination and Stability

Controlled Morphology Synthesis of Nanostructured β-AlF_3–x(OH)_x with Tunable Specific Surface Area

Selective Dehydrofluorination of 1,1,1,3,3‐Pentafluoropropane to Synthesize Tetrafluoropropylene and Trifluoropropyne over the ZnO/Cr₂O₃ Catalysts