Hydrolysis and oxidation on supported phosphate catalyst for decomposition of SF₆

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• 作者：No-Kuk Park^a ; Hyeon-Gyu Park^a ; Tae Jin Lee^a ; ^{tjlee@ynu.ac.kr} ; Won-Chul Chang^b ; Won-Tae Kwon^b
• 关键词：Decomposition of SF6 ; Hydrolysis and oxidation of SF6 ; 纬-Alumina ; Aluminum phosphate
• 刊名：Catalysis Today
• 出版年：2012
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：20 May, 2012
• 卷：185
• 期：1
• 页码：247-252
• 文件大小：1136 K

摘要

In order to decompose SF₆, AlPO₄/纬-alumina catalysts were prepared by the impregnation method and their catalytic activity for simultaneous hydrolysis and oxidation reactions was investigated in this study. SF₆ can be decomposed by catalytic hydrolysis and oxidation. Alumina catalysts have high activity for the decomposition of SF₆. However, 纬-Al₂O₃ is deactivated during the hydrolysis and oxidation of SF₆, due to the phase transformation of 纬-alumina to 伪-alumina and AlF₃. It was confirmed that the stability of the catalyst can be enhanced by using phosphoric acid impregnated over 纬-alumina. The impregnation of phosphoric acid over 纬-alumina led to the formation of AlPO₄ on the surface of the catalyst. The most suitable amount of phosphoric acid on 纬-alumina was 4.8 wt%. The surface area of the AlPO₄/纬-alumina catalyst decreased with increasing amount of phosphoric acid impregnated over 纬-alumina and the catalytic activity was also decreased due to the reduction of the surface area. The minimum space velocity should be kept below 5000 ml/g_cat h in order to obtain the maximum efficiency of AlPO₄/纬-alumina at 750 掳C. It was concluded that AlPO₄/纬-alumina can be used as a catalyst for the decomposition of SF₆ by simultaneous hydrolysis and oxidation.