Why is the ozone removal rate low? Key issues and solutions in corona treatment of ozone.

Why is Ozone Removal Efficiency Low?

In industrial scenarios such as corona discharge, low ozone removal efficiency is rarely caused by a single factor. Instead, it is the combined result of insufficient gas residence time, improper catalyst selection, fluctuating temperature and humidity conditions, flawed equipment design, and catalyst deactivation. Without systematic optimization tailored to the specific operating conditions, even using a high-quality ozone decomposition catalyst will fail to achieve stable and efficient ozone removal.

1. Causes of Ozone Generation in Corona Discharge Workshops

In industrial production, ozone is mainly generated during the corona discharge process. When air or oxygen‑containing gas is ionized under a high‑voltage electric field, oxygen molecules (O₂) are split into oxygen atoms (O), which then combine with O₂ to form ozone (O₃).

In actual corona discharge workshops, ozone concentrations typically range from 1–50 ppm or even higher, depending on the following factors:

1. Voltage intensity and frequency: the stronger the electric field, the higher the ozone generation rate
2. Gas composition: oxygen‑rich environments produce ozone more readily
3. Humidity conditions: humidity affects the balance between ozone generation and decomposition
4. Airflow velocity: influences the distribution and accumulation of ozone in the system

Because corona equipment typically operates with continuous discharge, ozone tends to exhibit a pattern of continuous generation + fluctuating emissions, which poses challenges for effective abatement.

2. Core Reasons for Low Ozone Removal Efficiency

2.1 Insufficient Residence Time

Ozone decomposition (especially catalytic decomposition) relies on full contact between the gas and the catalyst. When the gas velocity is too high or the reactor volume is too small, the following occurs:

• Ozone is exhausted before it can fully react
• Catalyst utilization decreases

This is one of the most common reasons for poor ozone decomposition efficiency.

2.2 Improper Catalyst Selection

Different catalysts vary significantly in their suitability for ozone decomposition:

Catalyst Type	Characteristics	Applicability
Activated Carbon	Good initial adsorption, but easily saturated	Low concentration, short‑term applications
Low‑Activity Metal Oxides	Limited reaction efficiency at room temperature	General industrial scenarios
Manganese Dioxide (MnO₂) Catalyst	High decomposition activity at room temperature	Preferred for corona ozone abatement

If the selected catalyst does not match the operating conditions (e.g., high humidity, high ozone concentration), ozone removal efficiency will be significantly reduced.

2.3 Significant Impact of Temperature and Humidity

The ozone decomposition process is sensitive to environmental conditions:

• High humidity can occupy catalyst active sites
• Low temperatures can decrease the reaction rate
• Temperature fluctuations affect overall stability

This issue is particularly pronounced in corona discharge workshops where humidity is not controlled.

2.4 Ozone Concentration Fluctuations

Corona discharge systems often experience load changes, resulting in ozone concentration variations:

• Transient high‑concentration spikes shock the catalyst
• The system struggles to maintain a stable treatment efficiency

2.5 Poor Reactor Design

Poor reactor design directly affects gas‑solid contact efficiency:

• Uneven gas distribution (short‑circuiting, dead zones)
• Improper catalyst packing methods
• Lack of flow‑guiding structures

2.6 Catalyst Deactivation

Over time, catalysts may experience performance degradation:

• Carbon deposition or contaminant fouling on the surface
• Loss of active components
• Pore blockage

3. Actual Hazards of Ozone (in Corona Discharge Workshop Scenarios)

In corona industrial environments, ozone primarily causes the following problems:

1. Corrosion of metal components: accelerates equipment aging
2. Damage to sealing materials: reduces system reliability
3. Negative impact on electronic components: increases failure rates
4. Disruption of the production environment: affects product consistency

4. Comparison of Common Ozone Treatment Methods

4.1 Activated Carbon Adsorption

Principle: physical adsorption of ozone

• Advantages: immediate initial effect, simple equipment
• Disadvantages: easily saturated, short service life, unstable under high concentrations

4.2 Thermal Decomposition

Principle: decomposition of ozone into oxygen at high temperatures

• Advantages: thorough decomposition
• Disadvantages: high energy consumption, high cost, unsuitable for room‑temperature operation

4.3 Catalytic Decomposition (Mainstream Solution)

Principle: ozone decomposes into oxygen at room temperature in the presence of a catalyst

• Room‑temperature operation
• Low energy consumption
• No secondary pollution
• Suitable for continuous industrial operation

5. Advantages and Application Value of Catalytic Decomposition

5.1 High Decomposition Efficiency at Room Temperature

No additional heating is required; high‑efficiency ozone decomposition is achieved under ambient conditions.

5.2 Adaptability to Complex Operating Conditions

Suitable for low‑to‑medium ozone concentrations and fluctuating conditions.

5.3 No Secondary Pollution

The reaction product is oxygen, which is environmentally friendly and safe.

5.4 Long Service Life

Under reasonable operating conditions, the catalyst can operate stably for extended periods.

5.5 Easy System Integration

Available in honeycomb, granular, and other forms for convenient engineering applications.

6. Summary: How to Improve Ozone Removal Efficiency?

Improving ozone removal efficiency requires systematic optimization, not merely a single technology upgrade:

• Design an appropriate residence time
• Select the right ozone decomposition catalyst
• Control temperature and humidity conditions
• Optimize airflow distribution
• Perform regular catalyst maintenance

If you encounter low ozone removal efficiency, system instability, or short catalyst life in practical applications, it usually means the current solution does not match your operating conditions. By tailoring both the catalyst and the system design to your specific needs, overall treatment efficiency can be significantly improved.