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Citation: FAN Jie, XU Xiu-Feng, NIU Xian-Jun. Decomposition of CF₄ over Al₂O₃-Based Metal Oxides[J]. Acta Physico-Chimica Sinica, ;2008, 24(07): 1271-1276. doi: 10.3866/PKU.WHXB20080725 shu

Decomposition of CF₄ over Al₂O₃-Based Metal Oxides

1.
Institute of Applied Catalysis, Yantai University, Yantai 264005, Shandong Province, P. R. China

Received Date: 3 December 2007
Available Online: 24 April 2008

The decomposition of CF4 in the absence of water on γ-Al2O3-based metal oxides was carried out to destruct the disposal perfluoro-carbons (PFCs) from industrial processes. In the present work, the conversion of CF4 was tested over bare γ-Al2O3 at different temperatures of 825, 850 and 900 ℃. It was found that the initial activity of Al2O3 increased in the order of 825 ℃<850 ℃<900 ℃CO2 yield declined quickly with time on stream because the un-reacted γ-Al2O3 was transformed into inactive α-Al2O3 phase that resulted from the highly exothermic effect of Al2O3-fluorination reaction. As for the CF4 decomposition on M -Al2O3, fluorination of Mg species and the highly exothermic effect produced led to the collapse of MgAl2O4 structure, in which the magnesium element was fluorinated into MgF2. Al2O3 modified with P or Ni could inhibit the transformation of un-reacted γ-Al2O3 into α-Al2O3 during CF4 decomposition, and consequently CF4 conversion reached a stable level with time on stream.
- CF4 decomposition; Al2O3; Transformation of γ-Al2O3 into α-Al2O3; Modified Al2O3
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沈阳化工大学材料科学与工程学院沈阳 110142

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Decomposition of CF4 over Al2O3-Based Metal Oxides

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通讯作者: 陈斌, bchen63@163.com

Decomposition of CF₄ over Al₂O₃-Based Metal Oxides