在/上的分解反应及活性组分的确认 /

程序升温联合恒温反应方式研究了CF4在P/Al2O3上的分解反应,用XRD、BET表面积测试技术对反应前后的P/Al2O3进行了表征。结果表明:在Al2O3表面负载助剂P,生成的Al-PO4抑制了CF4高温分解时γ-Al2O3发生α相变,提高了γ-Al2O3的结构稳定性,但加入P助剂减少了P/Al2O3中Al2O3的含量,使得P/Al2O3的脱氟活性没有显著提高,这说明P/Al2O3中Al2O3是活性成分,AlPO4是Al2O3的保护层。 The temperature-programmed reaction and isothermal reaction of CF4 decomposition over P/Al2O3 without water was carried out.P/Al2O3 before and after reaction were characterized by using XRD and BET.surface area measurement.CF4 conversion decreased quickly because the un-reacted γ-Al2O3 was transformed into α-Al2O3.After Al2O3 was modified with P,the formation of α-Al2O3 was inhibited by the protective layer of AlPO4 and consequently the structural stability of γ-Al2O3 were improved,but the de-fluorinated activity of P/Al2O3 did not increase evidently due to the decrease in Al2O3 content in P/Al2O3,it is demonstrated that Al2O3 is the active species in P/Al2O3