Exothermic effects and related surface properties of the ex situ presulfurized catalysts in fabrication and activation

• A novel ex situ presulfurization technology developed for hydrotreating catalyst.
• Employ of suitable organo-nitrogen substance in preparation enhanced sulfurization degree.
• Careful solvent selection and heat treatment lead to high hold sulfur percentage and activity.
• The exothermic behavior of an industrial unit can be reasonably predicted by HPDSC study.

An ex-situ presulfurization technology for transforming the metal oxides of hydrotreating catalyst to the corresponding metal oxy-sulfides was developed, involving pre-dispersion of an organo-nitrogen substance onto catalyst and a subsequent multi-step heat treatment. The inherence of exothermic effect involved in the ex situ pre-sulfurized catalyst fabrication and activation, and particularly the relationship between the exothermic effect and the surface property of catalyst were investigated. The results indicated that both the preparation parameters and the operating conditions can have effects on the exothermic behavior and surface state of the catalyst. The information obtained in the current study is useful for optimizing the EPRES process, essential for hydrotreating catalyst and its application.

A novel ex situ presulfurization technology developed for hydrotreating catalyst. (Employ of suitable organo-nitrogen substance in preparation enhanced sulfurization degree. (Careful solvent selection and heat treatment lead to high sulfur-hold percentage and activity. (The exothermic behavior of an industrial unit can be reasonably predicted by HPDSC study.Figure optionsDownload as PowerPoint slide