Effect of Steam and the Impregnated Metal on HFC-134a Catalytic Decomposition using Mg/c-Al2O3 


Vol. 30,  No. 4, pp. 345-356, Dec.  2024
10.7464/ksct.2024.30.4.345


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  Abstract

In this study, catalytic decomposition of HFC-134, a fluorinated greenhouse gas contributing to global warming, was performed using a c-Al2O3-based catalyst with air as the oxidant and steam as the proton donor. An initial screening of the commercial c-Al2O3 showed that c-Al2O3(A) had the largest BET surface area and the highest amount of acid sites. In addition, it had the highest conversion rate at all temperatures. Although the activity of the catalyst may be slightly reduced, 5 wt% Mg/c-Al2O3(A) impregnated with Mg, which is known to inhibit the deactivation of the catalyst, was prepared and the HFC-134a conversion rate was measured at different temperatures to understand the effect of Mg impregnation on the HFC-134a conversion rate. It was found that the conversion rate decreased with Mg/c-Al2O3(A) compared to c-Al2O3(A). This was attributed to the decreased activity of Mg/c-Al2O3 due to the decreased BET surface area and acidity. On the other hand, Mg/c-Al2O3(A) showed a conversion rate close to 100% at 600 oC, similar to that of c-Al2O3(A). After optimizing GHSV at 600 oC, a long-term decomposition reaction of HFC-134a was carried out under GHSV = 2,000 h–1, and the amount of steam was reduced to a ratio of H/F = 2 to decompose HFC-134a with a conversion rate of 98% for 100 h. Through the catalyst analysis before and after the reaction, it was confirmed that the Mg/c-Al2O3(A) catalyst could decompose HFC-134a over a long time due to the reduction of AlF3 generation by Mg impregnation and steam injection.

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  Cite this article

[IEEE Style]

M. Yoo, H. Jeong, C. Cho, D. Cho, "Effect of Steam and the Impregnated Metal on HFC-134a Catalytic Decomposition using Mg/c-Al2O3," Clean Technology, vol. 30, no. 4, pp. 345-356, 2024. DOI: 10.7464/ksct.2024.30.4.345.

[ACM Style]

Myeong-Heon Yoo, Heon-Do Jeong, Churl-hee Cho, and Dong-Woo Cho. 2024. Effect of Steam and the Impregnated Metal on HFC-134a Catalytic Decomposition using Mg/c-Al2O3. Clean Technology, 30, 4, (2024), 345-356. DOI: 10.7464/ksct.2024.30.4.345.