Each of our bespoke platinum based gauze catalysts for ammonia oxidation is made to meet customers’ specific requirements, with unique production and knitting patterns. They provide excellent conversion efficiency and pack weight while minimising N2O emissions and metal losses.

Gauze Catalyst
With one loyal customer we used an iterative approach to develop a catalyst using less platinum. Through analysis of spent gauze, we made step-wise improvements, ultimately reducing the metal content by a third and saving them €1,000,000 per year.

To provide the best solution for each plant, we offer Eco-Cat™ technology, binary knitted catalysts, standard woven gauze, corrugated gauze and ACT coatings. With our Research and Development (R&D) focus, we are continuously developing our gauzes to provide valuable solutions to customers.

Eco-Cat™ Technology

Our Eco-Cat™ gauze systems combine binary and ternary alloys. Using our latest, innovative technology along with a range of advanced alloys, wire diameters and knit structures, we offer an exclusively tailored package.

The Eco-Cat™ pack uses palladium in a controlled manner to replace some of the platinum in the gauze. Exploiting its metal recovery properties, the palladium catches lost platinum without compromising the ammonia conversion. This increases the gauze performance and gives a sustainable and efficient system for nitric acid production.

We are able to replace installed traditional gauzes with our Eco-Cat™ system, offering several advantages:

  • Increase in campaign lengths by 50-100%
  • No loss on conversion efficiency
  • Reduction in installed precious metal gauze weight by 40-50% - a result of the platinum being "reused" further down the gauze pack
  • Reduction in installed platinum weight by 30-40%
  • Reduction in overall metal losses by up to 50%
  • Reduced N2O emissions.

Binary Gauze Catalysts

Nitro-Lok™ Gauze

Primarily used for medium and high pressure plants, knitted Nitro-Lok™ gauze has a more uniform structure than traditional knits and offers several benefits:

  • An increase in flexibility
  • An increase in strength
  • The lowest density of the knitted products for a given wire diameter
  • A range of wire diameters available to meet individual plant requirements
  • A large open area, while increasing the surface area, ensuring optimum performance and handling
  • High tensile strength - a distinct advantage in plants with uncontrolled shutdowns.

Pro-Lok™ Gauze

Knitted Pro-LoK™ gauze was designed for low pressure and atmospheric plants, with a reduced open area and increased surface area. This:

  • Prevents ammonia slippage, which is extremely important in low pressure plants with a small number of installed gauzes
  • Increases the ammonia contact time and therefore the efficiency of ammonia oxidation
  • Provides low metal losses and installed weights.

Hi-Lok™ Gauze

Knitted Hi-LoK™ gauze has a unique structure with a high density and reduced open area compared to other knitted structures. Its high density and hence high metal weights means it is more commonly used in high pressure or top end medium pressure plants. The high density also means it is rarely used as the only structure in a gauze pack and is mainly integrated into tailored packs. It offers:

  • Rapid gas/metal contact time, allowing instantaneous conversion and reducing the number of catalyst gauze layers required
  • Increased strength and surface area, promoting good conversion at the top of the gauze pack
  • Increased support to reduce potential mechanical metal losses if used lower down in the gauze pack.

Traditional Rhodium Platinum Gauze

Our classic catalyst gauze technology offers a tailored solution for customers requiring standard alloy gauzes due to restrictions, constraints or simply preference. Through our traditional technology and modern methods we provide market leading gauzes.

Based on customer requirements we provide gauzes using two or three platinum group metals with different alloy percentages, including 5% RhPt and 10% RhPt. The gauze can be woven or knitted using wire diameters between 0.06-0.12mm.

Corrugated Gauze (HICON)

Our HICON corrugated systems are typically used in high and medium pressure plants. Its wave structure increases the contact surface area with ammonia which increases resistance to air flow, offering several advantages:

  • Increased ammonia conversion efficiency
  • Reduced overall pressure drop
  • Longer campaign lengths
  • Faster light-off
  • Lower energy costs
  • Reduced metal loss.

Advanced Coating Technology

Our ACT™ coating applies a thin coating of platinum to the gauze which can be used on selected layers in the pack. This encourages a more rapid light-off as well as improving platinum availability and gauze activation; particularly important for hydrogen cyanide production.

Gauze Specifications


Standard Gauze

Pro-Lok™ Gauze

Nitro-Lok™ Gauze

Hi-Lok™ Gauze

Eco-Cat™ Gauze

Weight per square meter

Gauze density ±5%

Wire Diameter Tolerance

± 0.003mm

Maximum Wire Diameter






Gauze Diameter Tolerance


Platinum Group Metal Content

99.95% min

Rhodium Content



Platinum Content

±0.5% (high Pd alloys)

Palladium Content



Iron Impurities

150 ppm

Gold Impurities

100 ppm

Copper Impurities

100 ppm

Silver Impurities

100 ppm

For more information on our catalyst gauzes please contact us, request a quote or fill out an enquiry form.