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对氧化态和硫化态的Fe-Mo/Al_2O_3加氢脱硫催化剂进行了穆斯堡尔谱的研究,并结合噻吩脱硫活性测试和XRD分析探讨了催化剂的物相组成及活性相。实验结果表明,不同Fe/Mo原子比的催化剂基体样品,其穆斯堡尔谱主要由钼酸铁Fe_2(MoO_4)_3的双峰和α-FeOOH的双峰以不同比例叠加而成。负载于氧化铝上后,穆斯堡尔谱产生明显变化,表明其间存在着强烈的相互作用。催化剂硫化后,得到Fe_(1-x)S的磁分裂谱,此外在中间部分还叠加了一个δ=0.35mm/s、△=0.78mm/s的双蜂。由于这组双峰的出现是以催化剂中Mo的存在为条件,
The Mossbauer spectra of Fe-Mo / Al_2O_3 hydrodesulfurization catalysts in the oxidized and the sulfidated states were studied. The phase composition and the active phase of the catalyst were also discussed in combination with the thiophene desulfurization activity and XRD analysis. The experimental results show that the Mossbauer spectra of the matrix samples with different Fe / Mo atomic ratios are mainly composed of double peaks of Fe 2 (MoO 4) 3 and double peaks of α-FeOOH in different proportions. After loading on alumina, the Mossbauer spectra changed significantly, indicating that there was a strong interaction between them. After the catalyst was sulfided, a magnetic fragmentation spectrum of Fe_ (1-x) S was obtained. In addition, a double bee with δ = 0.35 mm / s and Δ = 0.78 mm / s was superimposed in the middle part. Since the appearance of this group of doublets is based on the presence of Mo in the catalyst,