Catalytic decomposition of HFC-134a over metal oxide and phosphate catalysts to VDF: Reaction pathways of CH4 addition

Authors
Seo, Jeong MinSong, Hyun-taeChoi, Ye-naYang, Yu-jeongKim, Hyun DongLee, Kwan-YoungMoon, Dong Ju
Issue Date
2024-12
Publisher
한국공업화학회
Citation
Journal of Industrial and Engineering Chemistry, v.140, pp.530 - 544
Abstract
HFC-134a refrigerants are commonly used in air-conditioners and refrigerators. HFC-134a has a GWP 1,430 times higher than that of CO2 and contributes significantly to climate change. Therefore, research has been conducted to eliminate HFC-134a via catalytic decomposition. The catalytic decomposition of HFC-134a with the addition of CH4 over metal oxide (CaO, MgO, and Al2O3) and phosphate catalysts (Ca2P2O7, Mg2P2O7, and AlPO4) is described herein. The prepared catalysts were characterized by NH3-TPD, TGA, and BET analysis. Metal phosphate catalysts exhibited higher HF resistance than metal oxide catalysts. XRD, XRF, and SEM-EDS confirmed the superior resistance of metal phosphates to corrosive hydrogen fluoride (HF). VDF (C2H2F2) is a valuable feed product that can be polymerized into polyvinylidene fluoride (PVDF). In addition, the VDF yield increased with CH4 addition during the HFC-134a decomposition reaction. The CaP-calcium phosphate-catalysts exhibited an efficiency of more than 80 % and the highest VDF yield of 28.8 % after 10 h at 900 degrees C, 1 bar, and HFC-134a:CH4:N2 = 1:2:17 and RT = 1.0. The introduced CH4 feed acts as a CH3 donor during the decomposition of HFC-134a. Consequently, a comprehensive mechanism of VDF synthesis was proposed by comparing the presence of CH4 feed.
Keywords
CHF3; CONVERSION; ACID; DEHYDROFLUORINATION; TRIFLUOROMETHANE; CH2=CF2; SITES; MODEL; FLAME; GAS; HFC-134a; Catalytic decomposition; Refrigerant; Climate change; Metal oxide and metal phosphate catalyst; VDF
ISSN
1226-086X
URI
https://pubs.kist.re.kr/handle/201004/151231
DOI
10.1016/j.jiec.2024.06.012
Appears in Collections:
KIST Article > 2024
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