A catalyst with unmatched high activity for the final pass of double absorption

The VK69 catalyst is designed specifically for the final pass(es) of double absorption plants. In the lean SO₂ gas environment after the inter-pass absorption tower, the unique VK69 formulation offers unmatched high activity throughout the entire operating temperature range. This affords existing plants the opportunity to greatly reduce SO₂ emissions and/or increase production rates.

For new or revamped plants, SO₂ emissions of under 50 ppm are possible. Using cesium as a promoter, VK69’s extremely low ignition or “strike” temperature will significantly reduce pre-heat time and improve start-up performance.

The VK69 is manufactured in a unique 9 mm Daisy-shape. The high surface area contributes to the high activity in this gas environment and the high void-fraction ensures a low pressure drop and good dust tolerance.

• possibility for over 50% reduction in SO₂ emission from existing double absorption plants
• possibility for significantly increased production without increasing SO₂ emissions
• less than 50 ppm of SO₂ emissions possible from new or revamped plants--low ignition temperature for faster and cleaner start-ups
• long lifetime and low screening losses industrially proven since 1996
  
  

Low ignition temperature

The VK59 and VK69 catalysts have an exceptionally low ignition or “strike” temperatures of 320-330°C (610-625°F) that offer new possibilities for faster and cleaner start-ups. Autothermal restarts can be accomplished after a significantly longer idle time without the use of pre-heat.

9 mm Daisy

VK69 is produced in the unique 9 mm Daisy-shape. In the low SO₂ environment, 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. Also, the Daisy-shape ensures remarkably low pressure drop. The high surface area of the 9 mm Daisy contributes to the high activity, and the high void fraction ensures a low pressure drop.