Abstract: In view of the problem that the true sulfided hydrotreating catalyst is easy to self-heating in air environment, the passivation technology of the true sulfided hydrotreating catalyst was developed, and the enhancement effect of the passivation treatment on the antioxidant capacity of the true sulfided hydrotreating catalyst was investigated. Scanning electron microscopy, X-ray photoelectron spectroscopy, sulfur content analysis, microscopic image analysis and self-heating analysis were used to characterize the true sulfided hydrotreating catalyst samples before and after passivation treatment. The results showed that the passivation treatment could form a dense organic film on the outer surface of the catalyst, effectively blocking the contact between oxygen and the active metal on the catalyst,the oxidation resistance of the true sulfided hydrotreating catalystwas significantly enhanced, and the passivation treatment did not affect the activity of the catalyst. The first application of true sulfided hydrotreating catalyst produced after passivation treatment has been completed, which facilitates the catalyst loading and start-up process of industrial plants. At the same time, the safety of the use of the true sulfided catalyst is improved.

Key words: true sulfidation, hydrotreating catalyst, self-heating, passivation, commercial application