12 mm Daisy

The 12 mm Daisy has become the most widely used catalyst shape on the market since introduced by Topsoe in 1984. The high void fraction results in improved energy efficiency throughout the operating cycle due to low initial pressure drop and increased capacity for dust.

Topsoe’s VK38, VK48, and VK59 formulations are all available in the 12 mm Daisy-shape.

12 mm Daisy benefits

• low initial pressure drop
• high dust capacity yielding in a lower rate of pressure drop increase
• high activity
• low screening losses

25 mm Daisy - dust protection catalyst

A top layer of Topsoe’s 25 mm Daisy-shape catalyst can solve rapid pressure drop problems caused by dust in the feed gas. The extra void fraction and a lower specific surface area allow a significantly higher capacity for dust.

25 mm Daisy benefits

• 30-50% longer on-stream time compared to existing ring-shaped dust-protection catalysts
• 100% longer on-stream time compared to 12 mm Daisy
• maintenance cost savings due to less frequent catalyst screening
• energy cost savings due to lower plant pressure drop
• production increase due to longer time at maximum rate before pressure drop forces production decay

9 mm Daisy

VK69 is produced in the unique 9 mm Daisy-shape. In the low SO2 environments, after the intermediate absorption tower, the 9 mm size and Daisy-shape combination gives 30% extra activity compared to a 12 mm Daisy-shape, in part due to the higher surface area. Furthermore, the Daisy-shape ensures remarkably low pressure drop.

10 mm rings and 6 mm cylinders

Our VK catalysts are still available in the shape of 10 mm rings and 6 mm cylinders.