原位硫化热重分析用于CoMo/γ-Al2O3 系加氢催化剂表征研究

采用原位硫化热重分析技术研究了氧化铝负载的氧化态Co-Mo加氢脱硫催化剂在H2S/ H2氛围下的热重行为。通过硫化过程的增重值可计算出催化剂的相对硫化度，并与微反装置测定的催化剂加氢脱硫活性（HDS）进行了关联分析，发现催化剂相对硫化度与其HDS活性存在良好的相关性。用高分辨透射电子显微镜分析比较了微反装置硫化和热重原位硫化的硫化态Co-Mo加氢脱硫催化剂的微观形貌，结果显示，热重原位硫化的催化剂活性相微观形貌及活性相特征统计结果与微反硫化的硫化态催化剂相似。原位硫化热重分析可以作为快速筛选、评价加氢脱硫催化剂活性的工具。

STUDY ON THE CHARACTERIZATION OF Co-Mo/Al2O3 SERIES HDS CATALYST BY IN-SITU THERMOGRAVIMETRIC SULFIDATION

The thermogravimetric (TG) behaviors of Co-Mo/Al2O3 hydrodesulfurization (HDS) catalysts in the H2S/ H2 stream were studied in this paper. A relative sulfidation degree (RSD) of HDS catalyst was proposed to describe the sulfidation status of a catalyst and it could be determined by in-situ TG method. The correlation between RSD and the HDS activity was investigated, and good agreement was observed. High-resolution electron microscopy (HREM) was used to analyze the micro-morphology of catalyst samples taken from TG analyzer and microreactor respectively. Results showed that the micrographs, as well as the calculation data of active phase (MoS2) of these two samples were similar. Therefor the HDS activity of catalysts could be estimated quickly by in-situ sulfidation using TG analyzer.