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Catalysts 2019, 9(3), 270; https://doi.org/10.3390/catal9030270

Effect of Mg/Al2O3 and Calcination Temperature on the Catalytic Decomposition of HFC-134a

1
Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon 24252, Korea
2
Department of Science and Humanities, Saveetha School of Engineering, Chennai 600124, India
3
Research Center for Climate Change and Energy, Hallym University, Chuncheon 24252, Korea
4
School of Environmental Engineering, University of Seoul, Seoul 02504, Korea
5
Department of Environmental Engineering, Daegu University, Gyeongsan 38453, Korea
*
Authors to whom correspondence should be addressed.
Received: 3 February 2019 / Revised: 4 March 2019 / Accepted: 11 March 2019 / Published: 16 March 2019
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
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Abstract

This paper evaluated the effect of calcination temperature and the use of Mg/Al2O3 on the decomposition of HFC-134a. Two commercialized catalysts, Al2O3 and Mg/Al2O3, were calcined at two different temperatures (500 and 650 °C) and their physicochemical characteristics were examined by X-ray diffraction, Brunauer–Emmett–Teller analysis, and the temperature-programed desorption of ammonia and carbon dioxide analysis. The results show that, in comparison to Al2O3, 5% Mg/Al2O3 exhibited a larger Brunauer–Emmett–Teller surface area and higher acidity. The relative amount of strong acid sites of the catalysts decreased with increasing calcination temperature. Although a more than 90% decomposition rate of HFC-134a was achieved over all catalysts during the sequential decomposition test of HFC-134a using a vertical plug flow reactor connected directly to a gas chromatography/mass spectrometry system, the lifetime of the catalyst differed according to the catalyst type. Compared to Al2O3, Mg/Al2O3 revealed a longer lifetime and less coke formation due to the increased Brunauer–Emmett–Teller surface area and weak Lewis acid sites and basic sites arising from Mg impregnation. Higher temperature calcination extended the catalyst lifetime with the formation of less coke due to the smaller number of strong acid sites, which can lead to severe coke formation. A valuable by-product, trifluoroethylene, was formed as a result of the decomposition. Based on the experimental results, a reaction is proposed which reasonably explains the decomposition reaction. View Full-Text
Keywords: catalytic pyrolysis; HFC-134a; Mg/Al2O3; calcination temperature catalytic pyrolysis; HFC-134a; Mg/Al2O3; calcination temperature
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Andrew Swamidoss, C.M.; Sheraz, M.; Anus, A.; Jeong, S.; Park, Y.-K.; Kim, Y.-M.; Kim, S. Effect of Mg/Al2O3 and Calcination Temperature on the Catalytic Decomposition of HFC-134a. Catalysts 2019, 9, 270.

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