原位红外研究噻吩在硫化后Co-Mo/γ-Al2O3催化剂上吸附行为

在原油质量下降的趋势和柴油硫含量标准不断提升的背景下，为提升加氢脱硫催化剂催化活性及改进清洁油品的生产工艺，本文采用原位红外技术研究工业用直接脱硫路径活性较高的Co-Mo/γ-Al₂O₃催化剂的硫化行为和噻吩的吸附行为。实验结果表明，Co-Mo/γ-Al₂O₃催化剂的表面在约320℃硫化，噻吩在硫化后的Co-Mo/γ-Al₂O₃催化剂上原位升温脱附的过程中，噻吩的CC伸缩振动峰（1558cm^-1）和CH面内弯曲振动峰（1413cm^-1）在约250℃消失（对应π络合吸附）；CC伸缩振动峰（1679、1575cm^-1）和CH面内弯曲振动峰（1396cm^-1）在约350℃消失（对应M-S吸附）；而CC伸缩振动峰（1537、1513cm^-1）和CH面内弯曲振动峰（1338cm^-1）持续增强（对应π络合吸附）。这明晰了噻吩的吸附方式与其脱附温度之间的关系，为新型加氢脱硫催化剂的设计开发提供了试验数据支持。

Adsorption behavior of thiophene on Co-Mo/γ-Al2O3 catalyst by in-situ IR

Against the background of declining heavy oil quality and rising diesel sulfur standards, in order to improve hydrodesulfurization catalysts and production processes, the in-situ IR was used to study the sulfurization behavior of Co-Mo/γ-Al₂O₃ catalyst whose industrial direct desulfurization activity is higher and adsorption behavior of thiophene. Co-Mo/γ-Al₂O₃ catalyst surface was sulfided at 320℃, and during thiophene-temperature programmed desorption on sulfided catalyst, the thiophene adsorption characteristic peaks at 1558cm^-1 (CC vibration) and 1413cm^-1 (CH vibration) disappeared at 250℃(π complex adsorption); peaks at 1679, 1575cm^-1 (CC vibration ) and 1396cm^-1 (CH vibration) disappeared at 350℃(M-S adsorption), but peaks at 1537cm^-1, 1513cm^-1 (CC vibration) and 1338cm^-1 (CH vibration) strengthened (π complex adsorption). This clarifies the relationship between adsorption mode and desorption temperature of thiophene, which provides experimental data support for the design and development of higher activity catalysts.