The role of contact time and input amount of 1,1,1,2-tetrafluoroethane (HFC-134a) on the catalyst lifetime and product selectivity in catalytic pyrolysis
- Authors
- Anus, Ali; Sheraz, Mahshab; Jeong, Sangjae; Swamidoss, Caroline Mercy Andrew; Kim, Young-Min; Aslam, Muhammad Awais; Kim, Eui-kun; Kim, Seungdo
- Issue Date
- Jun-2021
- Publisher
- 한국화학공학회
- Keywords
- Catalytic Conversion; Pyrolysis; Contact Time; gamma-Al2O3; HFC-134a
- Citation
- Korean Journal of Chemical Engineering, v.38, no.6, pp 1240 - 1247
- Pages
- 8
- Journal Title
- Korean Journal of Chemical Engineering
- Volume
- 38
- Number
- 6
- Start Page
- 1240
- End Page
- 1247
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/18811
- DOI
- 10.1007/s11814-021-0776-6
- ISSN
- 0256-1115
1975-7220
- Abstract
- During catalytic pyrolysis of HFC-134a over gamma-alumina, the formation of HF and coke causes catalyst deactivation. Catalyst deactivation and product selectivity depend on the contact time during catalytic pyrolysis of HFC-134a as reported in this paper. gamma-Alumina calcined at 650 C-o was used as the catalyst due to its higher quantity of acidic sites and larger surface area, which are crucial for catalytic pyrolysis. X-ray diffraction (XRD), scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDS), and thermogravimetric analysis (TGA) of the catalysts were performed to determine the influence of contact time and flow rate of HFC-134a. 2 mL/min of HFC-134a balanced with nitrogen to 25, 50, 100, and 200 mL/min total flow rates was studied at 600 C-o. 200 mL/min showed a 9.4 h catalyst lifetime with a small number of by-products. Shorter contact time between HFC-134a and HF with the catalyst was found to be the key to the longer lifetime of the catalyst. The catalyst lifetime was decreased with an increase in the HFC-134a input amount. Among 2, 4, and 6 mL/min input of HFC-134a, 2 mL/min showed the longest catalytic activity followed by 4 and 6 mL/min, respectively. Conversion of gamma-alumina into AlF3 and deposition of coke were responsible for the deactivation.
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Collections - College of Engineering > Department of Energy and Environmental Engineering > 1. Journal Articles
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