Abstract: The combination use of the bulk catalyst developed by SINOPEC Fushun Research Institute of Petroleum & Petrochemicals and conventional diesel hydrotreating catalyst increases the HDS activity. The effect of loading positions of the bulk catalyst on HDS was tested. The results show that the bulk catalyst loaded at the upper part in the reactor (lower reaction temperature zone) is helpful to removal sulfur for diesel feeds with low processing difficulty; while for diesel with medium/higher processing difficulty, the lower part of the reactor (high temperature reaction zone) is better for bulk catalyst loading. The work provides a basis for the combination loading of bulk catalyst and conventional hydrotreating catalyst to improve the diesel ultra-deep HDS performance.

Key words: ultra-deep hydrodesulfurization, bulk catalyst, loading position