What Is an Ozone Decomposition Catalyst? Principles, Types, Performance and Selection Guide

Ozone (O₃) is a gas with extremely strong oxidizing capability and is widely used in industries such as wastewater treatment, drinking water disinfection, semiconductors, printing, chemical oxidation, and medical sterilization. However, after ozone completes the oxidation reaction, a certain concentration of ozone usually remains in the exhaust gas. If discharged directly without treatment, it can not only corrode equipment, but also affect human health and the environment.

An Ozone Decomposition Catalyst is a functional catalytic material that can rapidly convert ozone into oxygen at room temperature. Currently, catalytic decomposition has become one of the most widely used and lowest operating cost technical routes in the field of industrial ozone exhaust gas treatment.

This article will systematically introduce the composition, working principle, performance indicators, types, application scenarios, and selection methods of ozone decomposition catalysts.

What Is an Ozone Decomposition Catalyst

An ozone decomposition catalyst is a type of catalytic material specially used for ozone (O₃) elimination and purification. Its function is to accelerate the decomposition of ozone into oxygen (O₂) without additional energy consumption.

Ozone decomposition catalysts usually use manganese dioxide (MnO₂) as the main active component. Some high-performance products also add transition metal oxides such as copper oxide and iron oxide to form composite catalytic systems, thereby improving catalytic activity, moisture resistance, and service life.

These active components are not simply physically mixed, but form stable composite oxide structures through processes such as co-precipitation, high-temperature calcination, and molecular-level compounding, thereby obtaining higher catalytic efficiency.

In the industry, ozone decomposition catalysts are also commonly referred to as:

• Ozone Decomposition Catalyst
• Ozone Destruction Catalyst
• Ozone Removal Catalyst
• Ozone Reduction Catalyst
• Ozone Purification Catalyst

These names essentially refer to the same type of product.

Why Ozone Decomposition Catalysts Are Needed

Ozone itself is a thermodynamically unstable gas that will slowly decompose naturally into oxygen at room temperature. However, this process is relatively slow and cannot meet industrial exhaust gas treatment requirements.

If high-temperature thermal decomposition is used, the gas usually needs to be heated above 400°C to achieve rapid and complete ozone decomposition. This brings relatively high energy consumption and equipment operating costs.

In comparison, ozone decomposition catalysts have obvious advantages:

• Can rapidly decompose ozone at room temperature
• No additional heating required
• Very low energy consumption
• Low operating cost
• Simple equipment structure
• Convenient maintenance
• Suitable for continuous operation

Therefore, in wastewater treatment plants, drinking water plants, ozone generation systems, and industrial ozone exhaust gas treatment fields, catalytic decomposition has become one of the most mainstream ozone removal methods.

Working Principle of Ozone Decomposition Catalysts

Ozone (O₃) consists of three oxygen atoms and is a high-energy molecule with strong instability.

When ozone gas contacts the catalyst surface, ozone molecules are first adsorbed by the catalyst and undergo O–O bond cleavage reactions under the action of active sites, ultimately generating oxygen (O₂).

The ozone decomposition reaction is as follows:

2O₃ → 3O₂

The core role of the catalyst is to reduce the activation energy required for the ozone decomposition reaction, allowing ozone to rapidly complete decomposition under room temperature conditions.

The performance differences between different catalytic systems mainly come from the following aspects:

• Number of active sites
• Oxygen migration capability
• Specific surface area
• Pore structure
• Moisture resistance
• Dispersion degree of active components

High-performance ozone decomposition catalysts usually use manganese-copper composite oxide systems because they have higher low-temperature catalytic activity.

Key Factors Affecting the Performance of Ozone Decomposition Catalysts

The performance of ozone decomposition catalysts directly affects ozone purification efficiency, catalyst life, and system operating costs.

The following factors usually have the greatest impact on catalyst performance.

1. Catalytic Activity

Catalytic activity is the most important indicator for measuring the performance of ozone decomposition catalysts.

High-activity catalysts can:

• Improve ozone removal efficiency
• Reduce catalyst usage
• Reduce equipment volume
• Extend service life

Catalytic activity is closely related to catalyst formulation, elemental system, production process, and dispersion degree of active components.

2. Specific Surface Area

Specific surface area is usually measured by the BET test method, with the unit of m²/g.

Generally speaking, the higher the specific surface area:

• The stronger the ozone adsorption capacity
• The larger the reaction contact area
• The higher the catalytic efficiency

However, it should be noted that a high specific surface area must come from the effective active components themselves; otherwise, it has limited significance for actual catalytic performance.

3. Mechanical Strength

During long-term operation, catalysts need to withstand airflow impact and equipment vibration.

If the mechanical strength is insufficient, the catalyst may experience:

• Particle breakage
• Powdering
• Increased pressure drop
• Increased fan load
• Dust pollution

Therefore, high strength is very important for industrial continuous operation systems.

4. Active Component Content

Some low-cost catalysts add more inert materials to reduce production costs or improve forming performance.

Under normal circumstances:

• The higher the active component content
• The stronger the catalytic capacity per unit volume
• The longer the service life

The active component content of high-performance ozone decomposition catalysts can usually reach more than 80%, and some integrated catalysts are even close to 100%.

5. Catalyst Size

Catalyst size directly affects:

• Airflow resistance
• Contact efficiency
• Pressure drop
• Bed uniformity

If the particles are too small:

• Resistance will increase significantly
• Fan load will increase

If the particles are too large:

• Ozone may penetrate the catalyst bed
• Contact efficiency will decrease

Therefore, particle size needs to be reasonably selected according to ozone concentration, flow rate, and equipment structure.

How to Evaluate the Quality Grade of Ozone Decomposition Catalysts

In industry, the following indicators are usually used to quickly evaluate the quality of ozone decomposition catalysts.

Indicator	General Rule
Specific Surface Area (BET)	The higher, the better
Mechanical Strength	The higher, the better
Sieve Passing Rate	The higher, the better
Dust Rate	The lower, the better
Active Component Content	The higher, the better
Ozone Removal Efficiency	The higher, the better

However, it should be noted:

Simply increasing a certain physical indicator does not necessarily mean stronger catalytic performance.

Truly high-performance ozone decomposition catalysts need to achieve a balance between:

• Activity
• Strength
• Pore structure
• Moisture resistance
• Service life

What Types of Ozone Decomposition Catalysts Are There

Currently, ozone decomposition catalysts on the market can mainly be classified from the following aspects.

1. Classification by Production Process

Integrated Catalysts

The active components themselves directly form the catalyst body.

Advantages:

• High active component content
• High activity
• Long service life

Impregnated Catalysts

Active components are loaded onto the surface of the support.

Advantages:

• Lower cost
• Simple process

Disadvantages:

• Active component content is usually lower
• Easy to deactivate during long-term operation

2. Classification by Base Material

Support-Free Catalysts

Mainly composed of active oxides and have relatively high activity.

Aluminum-Based Catalysts

Have relatively good mechanical strength and are suitable for some industrial conditions.

Silica-Alumina Catalysts

Have certain heat resistance.

Carbon-Based Catalysts

Have relatively high specific surface area and adsorption performance, but are usually only suitable for low-concentration ozone environments. Under high-concentration ozone conditions, the carbon material itself may be oxidized.

3. Classification by Elemental System

Manganese-Based Catalysts

Lower cost and widely used.

Manganese-Iron Catalysts

Have certain moisture resistance.

Manganese-Copper Catalysts

Usually have higher low-temperature catalytic activity, but the cost is relatively higher. Currently, high-performance ozone decomposition catalysts mostly use manganese-copper composite systems.

Typical Applications of Ozone Decomposition Catalysts

Ozone decomposition catalysts are widely used in the following fields:

• Wastewater treatment plant ozone exhaust gas treatment
• Drinking water ozone systems
• Semiconductor industry
• PCB electronics industry
• Printing industry
• Medical sterilization systems
• Laboratory ozone treatment
• Corona discharge equipment
• Chemical oxidation exhaust gas treatment
• Ozone generator exhaust gas purification

Among them, the wastewater treatment and drinking water industries are one of the main application scenarios for ozone decomposition catalysts.

How to Select an Ozone Decomposition Catalyst

When selecting an ozone decomposition catalyst, the following factors need to be comprehensively considered:

• Ozone concentration
• Gas flow rate
• Temperature
• Humidity
• Dust content
• Whether sulfides are present
• Installation space
• System pressure drop requirements
• Project budget

During engineering design, it is usually necessary to calculate:

• Catalyst loading amount
• Catalyst bed dimensions
• Gas residence time
• System resistance

Under different operating conditions, different catalyst forms, sizes, and systems should be selected.

How to Properly Use Ozone Decomposition Catalysts

Ozone decomposition catalysts are usually installed inside fixed-bed reactors.

When ozone-containing gas passes through the catalyst bed, ozone is rapidly converted into oxygen.

However, in actual industrial environments, the gas may contain:

• Water vapor
• Dust
• Sulfides
• Oil mist
• Acidic gases

These impurities may cause catalyst poisoning or blockage of the pore structure.

Therefore, under complex operating conditions, it is usually necessary to set up appropriate pretreatment systems, such as:

• Dust removal
• Water removal
• Filtration
• Desulfurization

to extend catalyst service life.

Differences Between CARULITE 200 and MINSLITE-BG

CARULITE 200 from Carus and MINSLITE-BG from MINSTRONG are both high-performance manganese-copper ozone decomposition catalysts used in industrial fields.

The main parameter comparison is as follows:

Comparison Item	CARULITE 200	MINSLITE-BG
Manufacturer	CARUS	MINSTRONG
Catalyst System	Manganese-Copper	Manganese-Copper
Active Component Content	Close to 100%	Close to 100%
Specific Surface Area (BET)	200–250 m²/g	180–230 m²/g
Strength	≥97%	≥95%
Particle Size Specifications	4×8 mesh, 8×14 mesh	4×8 mesh, 8×14 mesh, 12×20 mesh

Compared with some ordinary ozone decomposition catalysts, these two products usually have the following characteristics:

• Higher activity of manganese-copper systems
• Higher active component content
• Higher specific surface area
• Better mechanical strength
• More suitable for industrial continuous operation

In some large wastewater treatment projects, both types of catalysts have been widely used.

FAQ: Frequently Asked Questions About Ozone Decomposition Catalysts

Will ozone decomposition catalysts be consumed?
The catalyst itself theoretically does not participate in permanent consumption, but during long-term operation, it may gradually deactivate due to contamination, poisoning, or structural aging.

Are ozone decomposition catalysts affected by water?
The activity of some catalysts may decrease in high-humidity environments, so moisture resistance is one of the important indicators of industrial catalysts.

Can activated carbon replace ozone decomposition catalysts?
Usually not. Activated carbon mainly removes ozone through adsorption, while ozone will continuously oxidize the carbon material, so its service life is limited.

Can ozone decomposition catalysts be regenerated?
Some catalysts can recover part of their activity through heating or purging under slight contamination conditions, but after severe poisoning, replacement is usually required.

Can ozone decomposition catalysts handle high-concentration ozone?
Yes, but an appropriate catalyst bed needs to be designed according to ozone concentration, temperature, and flow rate.

Conclusion

Ozone decomposition catalysts are a type of functional catalytic material capable of efficiently decomposing ozone under room temperature conditions. Their core performance depends on the catalytic system, active component content, specific surface area, mechanical strength, and production process.

With the continuous expansion of industrial ozone applications, high-performance ozone decomposition catalysts are being widely used in wastewater treatment, drinking water, semiconductors, medical treatment, and industrial exhaust gas treatment fields.

In industrial applications, reasonably selecting catalyst systems, optimizing catalyst bed design, and implementing proper pretreatment systems are of great significance for improving ozone purification efficiency and reducing operating costs.