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观察到Fe~(3+)离子、表面电子受主中心及铁磁共振三类EPR信号。在详细比较喷雾法和浸渍法两种催化剂的性能和EPR波谱特征的基础上,提出了只有处于Fe_2(MoO_4)_3物相的铁离子才能起改善催化剂性能作用的初步看法。
Fe ~ (3 +) ions, surface electron acceptor centers and three kinds of EPR signals of ferromagnetic resonance were observed. Based on the detailed comparison of the properties of the two catalysts (spray and impregnation) and the EPR spectroscopy, we propose that only iron ions in the Fe 2 (MoO 4) 3 phase can improve the performance of the catalysts.