XAFS study on HDS catalysts regenerated at various temperatures

Introduction The hydrodesulfurization (HDS) catalyst used in an oil refinery is deactivated during operation [1]. The spent catalyst can be reused after a regeneration process, whereby cokes deposited on the catalyst are removed. From an environmental point of view, the regeneration of catalysts used in refineries is becoming increasingly important. Researchers must gain a better understanding of the regeneration process, so as to optimize the regeneration conditions, with the goal of wider use of regenerated catalysts. Here, we report on the relationship between the chemical state and structure of Mo species on a regenerated CoMo HDS catalyst and its catalytic activity.