Catalyst Gauze Pack for Ammonia Oxidation Reactors

Product Specifications

Technical details and manufacturing context for Catalyst Gauze Pack

Definition

The Catalyst Gauze Pack is a critical component within an Ammonia Oxidation Reactor, consisting of multiple layers of platinum-rhodium alloy gauze arranged in a specific configuration. It serves as the catalytic surface where ammonia and air mixtures undergo controlled oxidation at high temperatures (typically 800-950°C) to produce nitric oxide, which is the primary intermediate in nitric acid production. The pack's design ensures optimal gas flow distribution, temperature management, and catalytic efficiency throughout the reaction zone. The gauze pack is typically circular, with a diameter matching the reactor internal diameter (1000–3000 mm). The thickness of the pack ranges from 5 to 20 mm, and the number of layers can vary from 10 to 60, depending on the desired conversion efficiency and pressure drop. The wire diameter is 0.06–0.12 mm, and the mesh count is 60–100 mesh, with higher mesh providing increased surface area. Catalyst loading is 20–50 g/m², affecting activity and lifetime. The operating temperature is 800–950°C; below 800°C conversion drops, and above 950°C the gauze degrades. Operating pressure is 1.0–1.6 MPa, and pressure drop across the pack is 5–15 kPa. Ammonia conversion rate is typically 95–98%. The gauze material is Pt-10Rh alloy (ASTM B616), and the total weight ranges from 5 to 20 kg, depending on diameter and layer count. The pack includes support grid/frame and edge reinforcement for mechanical integrity. These values are directory reference ranges and must be confirmed for the specific model and application with the legal manufacturer or supplier.

Working Principle

Ammonia-air mixture flows through the multiple layers of catalyst-coated gauze at high temperature and pressure. The platinum-rhodium alloy catalyzes the oxidation reaction: 4NH₃ + 5O₂ → 4NO + 6H₂O. The gauze structure provides high surface area for catalytic activity while allowing efficient gas passage and heat transfer. The layered configuration ensures complete ammonia conversion and minimizes pressure drop across the reactor.

Common Materials

Platinum-Rhodium Alloy Gauze, Support Grid/Frame, Edge Reinforcement

Technical Parameters

Parameter	Typical range	Notes & selection driver
Gauze Diameter	1000–3000 mm	Matches reactor internal diameter
Gauze Thickness	5–20 mm	Affects pressure drop and catalyst loading
Number of Layers	10–60 layers	Determines conversion efficiency
Wire Diameter	0.06–0.12 mm	Influences surface area and mechanical strength
Mesh Count	60–100 mesh	Higher mesh increases surface area
Catalyst Loading	20–50 g/m²	Affects activity and lifetime
Operating Temperature	800–950 °C	Below 800°C conversion drops; above 950°C gauze degrades
Pressure Drop	5–15 kPa	Higher layers increase pressure drop
Ammonia Conversion Rate	95–98 %	Typical for industrial operation
Gauze Material	Pt-10Rh alloy	Platinum-rhodium alloy for high temperature oxidationASTM B616
Weight	5–20 kg	Depends on diameter and layer count

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Catalyst Gauze Layers Part
Provide catalytic surface for ammonia oxidation reaction

Material: Platinum-Rhodium Alloy
Support Grid/Frame Part
Maintain structural integrity and proper spacing of gauze layers

Material: High-Temperature Alloy Steel
Edge Reinforcement Part
Prevent edge unraveling and maintain pack shape under thermal cycling

Material: Nickel Alloy
Spacer Rings Part
Maintain uniform spacing between gauze layers for optimal gas flow

Material: Ceramic or High-Temperature Alloy

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Ammonia Oxidation Reactor

View system integration details

Manufacturers of Catalyst Gauze Pack

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Frequently Asked Questions

What is the typical operating temperature range for a Catalyst Gauze Pack?

The typical operating temperature range is 800–950°C. Below 800°C, ammonia conversion efficiency drops, while above 950°C, the gauze material may degrade, reducing its service life.

How does the number of gauze layers affect performance?

The number of layers (10–60) directly influences conversion efficiency and pressure drop. More layers generally increase conversion but also increase pressure drop across the pack. The optimal number depends on the reactor design and process requirements.

What materials are used in the Catalyst Gauze Pack?

The primary material is a platinum-rhodium alloy (Pt-10Rh) gauze, as per ASTM B616. The pack also includes a support grid/frame and edge reinforcement for structural integrity.

What is the typical ammonia conversion rate?

The typical ammonia conversion rate is 95–98% under normal operating conditions. Actual performance may vary based on operating parameters, gauze condition, and reactor design.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 bar (maximum recommended operating pressure)
flow rate:	0.5-5.0 m/s superficial gas velocity (optimal range)
temperature:	750-950°C (typical operating range for ammonia oxidation)
ammonia concentration:	9-12% vol in air (standard feed composition)

Catalyst Gauze Pack

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