Seo, Jeong Min Song, Hyun-tae Choi, Ye-na Yang, Yu-jeong Kim, Hyun Dong Lee, Kwan-Young Moon, Dong Ju 2024-11-30T07:00:17Z 2024-11-30T07:00:17Z 2024-11-30 2024-12 1226-086X https://pubs.kist.re.kr/handle/201004/151231 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. English 한국공업화학회 Catalytic decomposition of HFC-134a over metal oxide and phosphate catalysts to VDF: Reaction pathways of CH4 addition Article 10.1016/j.jiec.2024.06.012 1 Journal of Industrial and Engineering Chemistry, v.140, pp.530 - 544 Journal of Industrial and Engineering Chemistry 140 530 544 N scie scopus kci ART003148068 001349857800001 2-s2.0-85199440229 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article 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