Hydrodesulfurization Catalyst

A: While our primary supply scope is fresh, high-activity commercial catalysts, our technical team provides handling guidelines for spent catalyst discharge during unit turnarounds. We assist refinery clients in understanding metal recovery pathways (such as recovering molybdenum, nickel, cobalt, and tungsten values) and provide safety recommendations for spent bed unloading and safe disposal in compliance with environmental regulations.

A: Unopened catalysts stored in standard sealed steel drums or jumbo bags under dry, weather-protected warehouse conditions maintain their chemical stability and mechanical integrity for a minimum of 24 to 36 months. We recommend keeping packaging tightly sealed prior to reactor loading to prevent moisture adsorption, which can affect initial catalyst activation and reactor heat-up procedures.

A: Most industrial hydrodesulfurization catalysts are supplied in their oxide form and require in-situ or ex-situ sulfiding (typically using dimethyl disulfide or sulfur-spiked feedstocks) to convert active metal oxides into active metal sulfides. We supply detailed startup, drying, reduction, and sulfiding technical guidelines tailored to each specific catalyst family (such as Co-Mo versus W-Ni systems) to ensure optimal initial activity and prevent premature deactivation.

A: Heavy metals present in heavy gas oils or cracked residues can deposit on the external surface and pore mouths of hydrotreating catalysts, causing pore blockage and gradual active-site poisoning. If your feedstock contains high levels of metallic contaminants, sharing this data allows our engineering team to recommend a tailored guard-bed configuration or a catalyst system with optimized macroporosity to maintain cycle length.