NF3在Co-Al复合氧化物上的分解反应-学兔兔 www.xuetutu.com.pdfVIP

学兔兔 石 油 化 工 2011年第40卷第4期 PETROCHEMICAL TECHN0L0GY ·435· 囊一工一 一 NF3在Co—Al复合氧化物上的分解反应 孙 亮，王亚楠，徐秀峰 (烟台大学 应用催化研究所，山东 烟台264005) [摘要]采用共沉淀法制备了n(Co)：n(A1)=0．1～4．0的Co—AI复合氢氧化物，再经焙烧得到Co—AI复合氧化物，对Co—AI 复合氧化物进行了XRD和N 吸附一脱附表征。在固定床反应器中，在无水条件下考察了Co—A1复合氧化物的脱氟活性。实验 结果表明，随n(Co)：n(AI)的增大，Co—AI复合氧化物的比表面积和孔体积减小；当n(Co)： (A1)=0 1时，Co—AI复合氧 化物具有较大的比表面积和孔体积；随 (Co)： (AI)的减小，Co—AI复合氧化物的脱氟活性逐渐提高，NF 全转化时间逐渐延 长，脱氟反应速率受扩散控制；脱氟反应后，Co—Ai复合氧化物转化为coF2和A1F 。 [关键词]三氟化氮；分解反应；钴一铝复合氧化物；脱氟剂 [文章编号]1000—8144(2011)04—0435—04 [中图分类号]TQ 031 3 [文献标识码]A NF3 Decomposition over Co—Al Mixed Oxides in the Absence of Water Sun Liang，Wang Yanan，Xu Xiufeng (Institute of Applied Catalysis，Yantai University，Yantai Shandong 264005，China) [Abstract] The Co—A1 mixed oxides were prepared through calcination of the Co—A1 mixed hydroxides with n(Co)：n(A1)atomic ratios of 0．1—4．0，which were synthesized by a co— precipitation method．The oxides and the hydroxides were characterized by means of XRD and N2 adsorption—desorption techniques．The defluorination activity of the Co—A1 mixed oxides in NF3 decomposition without water was investigated in a fixed—bed reactor．The results showed that the products obtained by calcination of the Co—A1 mixed hydroxides were the Co．Al mixed oxides：the BET specific surface area and pore volume of the Co—AI mi xed oxides decreased with the increase of n(Co)：n(A1)and the oxide with g／(Co)：n(A1)of0．1 had high surface area and pore volume；with the decrease of F／(Co)：月(A1)in the Co—A1 mixed oxides，the defluori