为减少汽车尾气排放和提高燃油质量， 对催化裂化汽油进行选择性加氢脱硫是生产低硫汽油的重要技术。 加氢脱硫催化剂活性金属的存在形态直接关系到催化剂的活性和选择性。 利用激光拉曼光谱方法研究了Co-Mo/Al2O3系加氢脱硫催化剂。 通过拉曼峰的归属给出其活性组元的存在形态， 合理的分峰给出活性金属各种存在形式的含量及其在载体表面的分散状态， 并将表征结果与微反加氢脱硫活性和选择性的评价结果进行了关联分析。 结果表明， 二维钼多聚物在940 cm-1左右特征峰的百分比与催化剂HDS选择性存在良好的线性关系， 940 cm-1处拉曼特征峰的百分比可作为选择性HDS催化剂制备和改进的实验依据。 硫化态样品的激光拉曼表征分析表明， 样品经硫化后， 氧化态Mo物种谱带839和940 cm-1己消失, 而在369和405 cm-1位置出现归属于Mo—S键的振动谱峰， 表明样品已基本完全硫化。 这为加氢脱硫催化剂的开发和研究提供了重要实验依据和指导。

Due to the implementation of more stringent specifications in sulfur content for gasoline , a deep understanding of the active phase of Co-Mo/Al2O3 catalysts is necessary to the development of hydrodesulphurization (HDS) catalysts. A series of Co-Mo/Al2O3 HDS catalysts with different metal loading were studied by laser Raman spectra. The existence form and the content of the active component of the catalyst were obtained by Raman spectra. The result shows that the percentage of characteristic Raman bands 940 cm-1 correlates linearly with the HDS selectivity, which can be used as an experimental evidence for developing industrial selective HDS catalysts. Raman spectra of sulfided catalysts show that the bands of oxidic catalysts at 839 and 940 cm-1 disappeared, and simultaneously, the bands of Mo—S at 372 and 408 cm-1 emerged, which indicate that the oxidic sample is sulfided completely.