The feed to a catalytic reforming unit is always hydrotreated. Why is this?

The feed to a catalytic reforming unit is always hydrotreated. Why is this?

• A. It reduces sulfur dioxide emissions
• B. It increases sulfur content in the feed
• C. It lowers the octane rating
• D. It removes sulfur, which poisons the reformer catalyst

Answer: (D)

The key idea is that the reforming catalyst is highly sensitive to sulfur. Sulfur compounds bind strongly to the active metal sites (such as platinum), forming metal sulfides that poison the catalyst, rapidly reducing its activity and selectivity. By hydrotreating the feed, sulfur is converted to hydrogen sulfide and removed, protecting the reformer catalyst and allowing the unit to operate effectively. This is more important than any changes to octane or emissions downstream—the presence of sulfur would immediately degrade reforming performance, so the feed is treated to remove it.

The key idea is that the reforming catalyst is highly sensitive to sulfur. Sulfur compounds bind strongly to the active metal sites (such as platinum), forming metal sulfides that poison the catalyst, rapidly reducing its activity and selectivity. By hydrotreating the feed, sulfur is converted to hydrogen sulfide and removed, protecting the reformer catalyst and allowing the unit to operate effectively. This is more important than any changes to octane or emissions downstream—the presence of sulfur would immediately degrade reforming performance, so the feed is treated to remove it.