对活性炭(AC)进行酸处理能够改变表面含氧官能团,从而加强金属前驱体与活性炭载体的锚固作用,改变催化剂的分散度和表面碱性.采用HCl,HNO3和HF分别对AC进行处理,制得一系列AC负载的RbNO3-KF催化剂,考察了它们在气相合成C2F5I反应中的催化性能.采用N2吸附-脱附、Boehm滴定、CO2程序升温脱附、X射线衍射、X射线光电子能谱和元素分析对催化剂进行了表征.结果表明,AC经HCl处理后RbNO3-KF/AC催化剂具有较高的分散度和适中的弱碱性,有利于气相催化合成C2F5I.各催化剂分散度大小顺序为:RbNO3-KF/AC(HNO3)＞RbNO3-KF/AC(HF)＞RbNO3-KF/AC(HCl)＞RbNO3-KF/AC.该顺序与相应载体表面的酸性和官能团变化趋势一致,但与催化剂表面的碱性并无对应关系.催化剂表面碱性与AC表面含氧官能团和表面碱性有关.
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