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原子X射线吸收精细结构(AXAFS)由吸收原子的外围束缚电子对出射光电子波的背散射引起,AXAFS信号与嵌入原子势能、原子间隙势能和吸收原子电子密度的分布密切相关,可以作为精确的探针来探测原子的电子化学结构。研究利用AXAFS技术,以Ni/ZnO脱硫吸附剂为研究对象,探讨了模型油在不同气体气氛下的脱硫反应机理。结果表明,在氢气气氛下、350℃和3.0MPa的条件下,从Zn元素的原位AXAFS谱图中可观察到脱硫过程中Zn元素的化学态变化。根据这些结果,揭示了氢气在脱硫过程中的重要作用,阐述了原位反应条件下吸附剂中Zn元素的化学态变化。
AXAFS is caused by the backscattering of the outgoing photoelectron wave by the external bounding electrons of the absorbing atoms. The AXAFS signal is closely related to the potential energy of the embedded atoms, the potential energy of the interstitial space and the distribution of the electron density of the absorbing atoms, which can be used as an accurate probe Needle to detect the atomic electronic chemical structure. In this study, the desulfurization reaction mechanism of model oil under different gas atmospheres was discussed by using AXAFS technology and Ni / ZnO desulfurization sorbent. The results show that the chemical states of Zn in the desulfurization process can be observed from the in-situ AXAFS spectra of Zn under hydrogen atmosphere at 350 ℃ and 3.0MPa. Based on these results, the important role of hydrogen in the desulfurization process is revealed, and the change of the chemical state of Zn in the adsorbent under the in situ reaction conditions is expounded.