화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.38, No.6, 1240-1247, June, 2021
DOI10.1007/s11814-021-0776-6  Export Citation
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
Ali Anus, Mahshab Sheraz, Sangjae Jeong1, Caroline Mercy Andrew Swamidoss2, Young-Min Kim3, Muhammad Awais Aslam4, Eui-kun Kim5, and Seungdo Kim†
  • Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon 24252, Korea
  • 1Department of Energy & Environmental Engineering, College of Engineering, Soonchunhyang University, Asan, Chungcheongnam-do 31538, Korea
  • 2Department of Chemistry, Dr. M.G.R. Educational and Research Institute, Chennai, 600095, India
  • 3Department of Environmental Engineering, Daegu University, Gyeongsan 38453, Korea
  • 4Research Center for Climate Change and Energy, Hallym University, Chuncheon 24252, Korea
  • 5Environment Strategy Development Institute, Hallym University, Chuncheon 24252, Korea
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During catalytic pyrolysis of HFC-134a over γ-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. γ-Alumina calcined at 650 °C 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. 2mL/min of HFC-134a balanced with nitrogen to 25, 50, 100, and 200mL/min total flow rates was studied at 600 °C. 200mL/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 6mL/min input of HFC-134a, 2mL/min showed the longest catalytic activity followed by 4 and 6mL/min, respectively. Conversion of γ-alumina into AlF3 and deposition of coke were responsible for the deactivation.
Keywords:Catalytic Conversion;Pyrolysis;Contact Time;γ-Al2O3;HFC-134a
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