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近来,用ESR方法研究吸附在催化剂载体表面上的氧氮自由基行为引起了广泛的兴趣,Lozos等[1]观察到DTBN在Al_2O_3-SiO_3等载体上有两种谱:一种是~(14)N(I=1)所引起的三重谱;另一种是~(27)Al(I=5/2)引起的六重谱。表明自由基被吸附在两种不同活性位置上,EBPEHOB等[2]研究了TMPO在γ-Al_2O_3上运动受阻情形计算了相关时间τ值。但对更稳定的氧氮自由基,由于结合较弱,实验困难,迄今尚无报导。本文研究了TEMPONE(4-氧-2,2,6,6-四甲基哌啶-1-氧自由基)在活性Al_2O_3上的ESR谱,
Recently, the ESR study of the adsorption of oxygen and nitrogen free radicals on the surface of the catalyst support has attracted a wide range of interest. Lozos et al. [1] observed that DTBN has two kinds of spectra on carriers such as Al 2 O 3 -SiO 3: ) N (I = 1); the other is the six-fold spectrum caused by ~ (27) Al (I = 5/2). Indicating that free radicals are adsorbed at two different active sites, EBPEHOB et al. [2] studied the TMPO in γ-Al 2 O 3 on the motion blocker calculated the relevant time τ value. But for more stable oxygen and nitrogen free radicals, due to the combination of weak, experimental difficulties, so far no report. In this paper, the ESR spectra of TEMPONE (4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl) on active Al 2 O 3 were studied.