Structured Manufacturing Data (2026)

Ammonia Oxidation Reactor

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Ammonia Oxidation Reactor used in the Chemical Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Ammonia Oxidation Reactor is characterized by the integration of Reactor Shell/Vessel and Catalyst Gauze Pack. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel (e.g., 304/316L for shell) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A reactor where ammonia is catalytically oxidized with air to produce nitrogen monoxide, the primary reaction step in nitric acid production.

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Product Specifications

Technical details and manufacturing context for Ammonia Oxidation Reactor

Definition
The Ammonia Oxidation Reactor is a critical component within the Integrated Nitric Acid Production and Concentration System. It facilitates the high-temperature, catalytic oxidation of ammonia (NH₃) with atmospheric oxygen (from air) over a platinum-rhodium catalyst gauze. This exothermic reaction produces nitrogen monoxide (NO) and water vapor, which are the essential feed gases for the subsequent oxidation and absorption stages that ultimately yield nitric acid (HNO₃). The reactor's design is optimized for high conversion efficiency, temperature control, and catalyst management.
Working Principle
A mixture of preheated, filtered ammonia and air is passed through one or more layers of platinum-rhodium alloy catalyst gauze inside the reactor vessel. At temperatures typically between 850°C and 950°C, the ammonia reacts catalytically with oxygen to form nitrogen monoxide (NO) and water. The reaction is highly exothermic, and the heat generated is often recovered via waste heat boilers. The hot product gases (NO, N₂, O₂, H₂O) then exit the reactor to be cooled and processed further in the system.
Common Materials
Stainless Steel (e.g., 304/316L for shell), Platinum-Rhodium Alloy Catalyst Gauze, Refractory Lining
Technical Parameters
  • Diameter of the reactor shell and catalyst gauze, critical for determining gas throughput and residence time. (mm) Customizable
Components / BOM
  • Reactor Shell/Vessel
    Pressure-retaining containment vessel for the reaction, designed to withstand high temperatures and corrosive gases.
    Material: Stainless Steel (e.g., 304/316L)
  • Catalyst Gauze Pack
    The active catalytic surface where the ammonia oxidation reaction occurs. Typically multiple layers of platinum-rhodium alloy mesh.
    Material: Platinum-Rhodium Alloy (e.g., Pt-10%Rh)
  • Gas Distributor/Inlet Nozzle
    Ensures uniform distribution of the ammonia-air mixture across the catalyst bed to prevent hot spots and ensure even reaction.
    Material: Stainless Steel
  • Thermocouple Wells
    Housings for temperature sensors to monitor catalyst bed and gas temperatures at critical points.
    Material: High-Temperature Alloy (e.g., Inconel)
  • Refractory Lining Part
    Insulating layer inside the shell to protect the metal from extreme process temperatures and reduce heat loss.
    Material: Ceramic Fiber or Castable Refractory
  • Outlet Nozzle/Duct Part
    Directs the hot product gas stream (NO, N₂, O₂, H₂O) out of the reactor to the downstream waste heat boiler.
    Material: Stainless Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Ammonia Oxidation Reactor.

platinum rhodium catalyst ammonia oxidation reactor stainless steel nitric acid production reactor industrial ammonia oxidation reactor specifications catalyst gauze pack replacement for oxidation reactors high temperature ammonia oxidation react

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 1-10 bar (atmospheric to moderate pressure systems)
flow rate: Varies by capacity: 100-100,000 Nm³/h ammonia-air mixture
temperature: 800-950°C (typical operating range for platinum-rhodium gauze catalysts)
ammonia concentration: 9.5-11.5 vol% in air (explosive limits consideration)
conversion efficiency: 94-98% ammonia to NO under optimal conditions
Media Compatibility
✓ Stainless steel 304/316L (for lower temp sections) ✓ Inconel 600/625 (for high temp sections) ✓ Alumina refractory lining (for insulation and corrosion protection)
Unsuitable: Chlorine-containing environments (causes catalyst poisoning and material corrosion)
Sizing Data Required
  • Required nitric acid production capacity (tons/day)
  • Ammonia feed purity and flow rate (Nm³/h)
  • Desired operating pressure (affects catalyst loading and reactor dimensions)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Catalyst bed channeling
Cause: Uneven gas distribution or catalyst degradation leading to localized hot spots and reduced conversion efficiency
Thermal stress cracking
Cause: Rapid temperature fluctuations during startup/shutdown cycles or process upsets exceeding material thermal fatigue limits
Maintenance Indicators
  • Sudden drop in ammonia conversion efficiency with corresponding temperature profile abnormalities
  • Audible pinging or cracking noises from reactor shell during thermal transients
Engineering Tips
  • Implement predictive temperature profiling with infrared thermography to detect early-stage hot spots before catalyst damage occurs
  • Optimize startup/shutdown procedures using controlled ramp rates and maintain minimum turndown ratios to prevent thermal shock

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems ASME BPVC Section VIII - Rules for Construction of Pressure Vessels EN 13445 - Unfired Pressure Vessels
Manufacturing Precision
  • Catalyst Bed Support Grid Flatness: ≤ 0.5 mm/m
  • Reactor Shell Circumferential Weld Misalignment: ≤ 1.5 mm
Quality Inspection
  • Radiographic Testing (RT) of All Pressure-Bearing Welds
  • Hardness Testing of Heat-Affected Zones (HAZ) Post-Weld Heat Treatment

Factories Producing Ammonia Oxidation Reactor

Manufacturer profiles with relevant production capability in China

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Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What catalyst material is used in ammonia oxidation reactors and why?

Ammonia oxidation reactors use platinum-rhodium alloy catalyst gauze (typically 90% platinum, 10% rhodium) because this combination provides optimal catalytic activity, high temperature stability, and resistance to poisoning while maximizing nitrogen monoxide yield.

What are the key maintenance considerations for ammonia oxidation reactors?

Regular catalyst gauze inspection and replacement (typically every 3-6 months), refractory lining integrity checks, thermocouple calibration, and monitoring of gas distributor performance are essential. Pressure drop across the catalyst bed should be monitored to detect gauze degradation.

How does temperature control affect reactor performance in nitric acid production?

Maintaining optimal temperature range (typically 850-950°C) is critical for maximizing NO yield while minimizing unwanted byproducts like N₂O. Temperature affects reaction kinetics, catalyst activity, and equipment longevity, requiring precise control through proper gas preheating and heat management.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Chemical Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
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