Nickel Aluminum Spinel Derived Ni‐F‐Al Active Site for the Catalytic Dehydrofluorination of Potent Greenhouse Gas 1,1,1,2‐Tetrafluoroethane

Greenhouse Gases Science and Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

ABSTRACT HFC‐134a (1,1,1,2‐tetrafluoroethane) is one of the most common refrigerants with global warming potential (100 years) 1300. It regulated to be phased out gradually according Kigali Amendment Montreal Protocol. Treatment this stable chemical poses significant challenge. Highly efficient nickel aluminum spinel catalysts were fabricated by sol–gel method for catalytic dehydrofluorination HFC‐134a. The effect Ni/Al ratio in NiAl 2 O 4 precursors on performance was studied x‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscope (SEM), transmission microscopy (TEM), NH 3 ‐TPD, and XPS. Nickel–aluminum nickel–aluminum precursor plays a major role formation strong acid active species Ni‐F‐Al. With 4, (3 1 1) crystal face interfaced (1 NiO (4 0 0) . This interaction facilitates Ni‐F‐Al following reaction. Furthermore, altered structure catalysts. found that catalyst has best compared other (with conversion 35%), no deactivation trend observed after 50 h time stream. (Reaction conditions: N /CF CH F = 10, T 450°C, GHSV 660 −1 ).

Language: Английский

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Interface catalysis over AlPO4/Al2O3 with F-Al-O Species for Resource Utilization of Hydrofluorocarbon Greenhouse Gas

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 115929 - 115929

Published: Feb. 1, 2025

Language: Английский

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AlF3-Modified Carbon Anodes for Aluminum Electrolysis: Oxidation Resistance and Microstructural Evolution

Inorganics, Journal Year: 2025, Volume and Issue: 13(5), P. 165 - 165

Published: May 15, 2025

The aluminum electrolysis industry faces significant challenges due to the high consumption and environmental impact of carbon anodes, which are prone oxidation in high-temperature strongly oxidizing environments. This study innovatively introduces fluoride (AlF3) as an additive enhance resistance anodes for electrolysis. By systematically exploring microstructural evolution through SEM, XRD, Raman spectroscopy, permeability analyses, it reveals that AlF3 inserts fluorine atoms into interlayers, forming F-C bonds reduce interlayer spacing while promoting graphitization. Simultaneously, AlF3-derived α-Al2O3 particles densify anode make more compact, reaching optimum when 7 wt.% is doped. bulk density increased 2.08 g/cm3, porosity decreased 0.315, air reached a minimum 2.3 nPm. In addition, intercalation reduces electrical 2.12 Ω via conductive clusters. demonstrated efficacy additives enhancing conductivity suggests strong potential industrial adoption, particularly optimizing composition energy consumption.

Language: Английский

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Efficient Conversion of Fluorinated Greenhouse Gases Using Aluminum-Doped Hydroxyapatite

Applied Catalysis A General, Journal Year: 2024, Volume and Issue: unknown, P. 120089 - 120089

Published: Dec. 1, 2024

Language: Английский

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