Why Choose Hopcalite for CO Removal in Air Separation Systems and High-Purity Gas Production?

Although carbon monoxide (CO) is typically present at low concentrations in air separation systems and high-purity gas production, its potential risks should not be underestimated. CO can not only create operational hazards under cryogenic conditions, but may also affect the purity standards required for electronics, semiconductors, medical gases, and specialty gases. Therefore, industrial systems usually need to reduce CO to extremely low levels before cryogenic separation or high-purity purification processes.

Hopcalite catalyst can catalytically oxidize CO into CO₂ at relatively low temperatures and, when combined with downstream CO₂ adsorption processes, achieve deep gas purification. Due to its high reaction efficiency, mature technology, and stable operation, it has become one of the most widely used CO removal solutions in air separation and high-purity gas systems.

Why Is CO Control Important in Air Separation Systems?

The CO concentration in ambient air is generally low, but in industrial environments, it may increase due to combustion exhaust gases, compressor lubricant contamination, or surrounding environmental conditions.

If CO is not effectively removed in an air separation unit (ASU), several common problems may occur:

Increased Operational Risks in Cryogenic Systems

Under low-temperature conditions, CO may condense or accumulate, affecting the stable operation of heat exchangers and cryogenic equipment. In some operating conditions, it may even create safety concerns for the entire system.

Difficulty Achieving High-Purity Gas Standards

Electronic-grade nitrogen, high-purity oxygen, and specialty shielding gases often require extremely strict CO limits. Even ppm-level or lower concentrations of CO may negatively impact downstream process stability.

Contamination of Downstream Equipment

Adsorbents, membrane separation materials, and precision process equipment used in high-purity applications can be highly sensitive to CO. Insufficient front-end purification may shorten equipment lifespan and increase maintenance costs.

Therefore, although CO is considered a trace impurity, it usually requires dedicated treatment in high-purity gas systems.

How Does Hopcalite Catalyst Remove CO?

Hopcalite catalyst is essentially a transition metal oxide catalytic system that converts CO into CO₂ through catalytic oxidation.

The core reaction is as follows:

2CO + O₂ → 2CO₂

The main characteristics of this reaction include:

• No need for high-temperature combustion;
• Operation at relatively low temperatures;
• Fast reaction rates;
• Excellent performance for low-concentration CO removal.

In practical systems, the generated CO₂ is further removed through molecular sieve or adsorption units, enabling overall gas purification.

This combination of “catalytic oxidation + adsorption removal” is currently one of the most mature process routes in industrial gas purification.

Where Is the Hopcalite Catalyst Bed Typically Installed?

In air separation systems, the Hopcalite catalyst bed is usually located between the pretreatment section and the cryogenic system.

A typical process flow is as follows:

Air Compression
→ Dust Filtration
→ Oil and Moisture Removal
→ Drying Process
→ Hopcalite Catalytic CO Oxidation
→ CO₂ Removal
→ Cryogenic Air Separation
→ High-Purity Gas Output

This arrangement follows clear engineering logic.

First, Hopcalite catalyst is sensitive to moisture, so the gas stream usually requires thorough drying before entering the catalyst bed. Second, since catalytic oxidation generates CO₂, a downstream CO₂ adsorption unit is necessary to prevent CO₂ from entering the cryogenic system.

This process configuration helps ensure catalytic efficiency, system stability, and protection of downstream equipment.

What Are the Advantages of Hopcalite Catalyst Compared with Other CO Removal Methods?

Although there are several methods for CO treatment in industrial gas purification, Hopcalite catalytic systems are widely adopted mainly because of the following advantages.

Strong Low-Temperature Operating Capability

Compared with high-temperature oxidation processes, Hopcalite catalyst can typically operate under lower temperature conditions, making it more suitable for continuously operating air separation systems.

Better for Trace CO Removal

For ppm-level or even lower CO concentrations, conventional combustion methods may have limited efficiency, while catalytic oxidation is more effective for achieving deep purification.

Mature and Stable Technology

Hopcalite catalytic technology has been widely used in industrial gas purification for many years, offering extensive engineering experience and relatively standardized system configurations.

Lower Operating Energy Consumption

Since no high-temperature combustion environment is required, the overall operating energy consumption is usually lower than thermal oxidation processes.

These characteristics make Hopcalite catalyst especially suitable for high-purity gas production and continuous industrial operations.

What Should Be Considered During Hopcalite Catalyst Operation?

Although Hopcalite catalyst technology is mature, several important factors still require attention during practical operation.

Moisture Control

High humidity may reduce catalytic activity, so effective dehydration is usually required in the pretreatment stage.

Oil Mist and Sulfur Compound Contamination

Certain organic compounds, sulfur-containing substances, or oil contaminants may poison the catalyst. Therefore, a reliable pretreatment system is extremely important.

Temperature and Space Velocity Matching

Under different operating conditions, the catalyst bed size and operating parameters should be properly designed according to CO concentration, gas flow rate, and system temperature.

Downstream CO₂ Removal

The CO₂ generated during catalytic oxidation must be further removed; otherwise, the required high-purity gas specifications cannot be achieved.

Therefore, a mature CO purification system depends not only on the catalyst itself, but also on the complete front-end and back-end process design.

In air separation systems and high-purity gas production, although CO is only a trace impurity, it can significantly affect system safety, equipment stability, and gas purity. With its low-temperature catalytic oxidation capability, mature process technology, and excellent trace CO removal performance, Hopcalite catalyst has become an important solution in industrial gas purification.

For systems requiring high-purity gas output, the proper integration of Hopcalite catalyst beds, front-end pretreatment systems, and downstream CO₂ adsorption units remains one of the most reliable and widely adopted engineering solutions available today.

author:kaka

date:2026/5/26