How to Optimize the Moisture Resistance of Ozone Decomposition Catalysts?

A company specializing in the research and production of a series of environmental catalytic materials, including ozone decomposition catalysts, carbon monoxide catalysts, hopalat agents, manganese dioxide, copper oxide, VOC catalysts, and hydrogen peroxide catalysts, is compiling information to provide highly adaptable catalytic material solutions for various environmental governance scenarios. We hope this information is helpful.

Our main clientele includes: industrial waste gas treatment companies, ozone purification equipment manufacturers, environmental protection companies in the motor vehicle, shipbuilding, exhaust gas treatment, petrochemical, and chemical industries, coating, printing, VOCs treatment, municipal and industrial wastewater treatment companies, flue gas treatment companies in the metallurgical and thermal power industries, laboratory and enclosed space air purification equipment manufacturers, and environmental engineering general contracting and operation and maintenance companies.

In the ozone treatment process, high humidity is one of the main causes of ozone decomposition catalyst deactivation. Whether in industrial exhaust gas treatment, mine refuge chambers, or fruit and vegetable preservation warehouses, varying degrees of high humidity exist, easily leading to the occupation of catalyst active sites, dissolution of active components, and shortened service life. The core logic for optimizing the moisture resistance of ozone decomposition catalysts is to reduce the competitive adsorption of water molecules on active sites, inhibit the dissolution of active components and the collapse of the carrier structure, and achieve a balance between moisture resistance and catalytic activity by combining formulation, preparation process, and modification technology.

1. Modification of active components to improve water resistance.

Prioritizing Moisture-Resistant Active Components:Traditional Mn-based catalysts are composited with noble metals or rare earth elements such as Ag and Ce to form stable redox pairs, reducing the impact of water molecules on active sites. For example, a research team combined CeO₂ with MnOₓ to prepare an ozone decomposition catalyst that maintained an ozone decomposition rate of over 92% at 90% relative humidity, far exceeding the 70% of pure Mn-based catalysts. Simultaneously, the crystal form of the active components was controlled, optimizing MnO₂ to the δ phase, which enhances hydrothermal stability and avoids phase transformation under high humidity.

2. Carrier Optimization to Enhance Hydrophobicity and Structural Stability:

As the "skeleton" of the active components, the carrier is preferentially selected from hydrophobic carriers such as modified zeolites and carbon-based materials to reduce surface hydrophilic groups. Through calcination and silanization modification, the specific surface area and pore structure stability of the carrier are improved, preventing collapse caused by wet-dry cycles. A specialized ozone decomposition catalyst for mine refuge chambers, employing a silanized modified activated carbon support combined with Mn-Co active components, exhibited only a 5% activity decay after six months of continuous operation in a 95% high humidity environment, significantly superior to the 30% decay rate of the unmodified catalyst.

3. Upgraded preparation process to enhance the binding force of active components.

Optimized impregnation and precipitation processes controlled the dispersion and loading of active components, preventing agglomeration; the calcination temperature was appropriately controlled between 350-450℃, enhancing the interaction between the active components and the support and reducing dissolution under high humidity. A domestic petrochemical company replaced the traditional impregnation method with an ultrasonic-assisted impregnation method, resulting in a Mn-Al composite catalyst where the active component dissolution rate in high-humidity industrial tail gas decreased from 15% to 3%, and the moisture resistance life was extended by 2 times.

4. Surface hydrophobic coating modification to construct a water-resistant barrier.

Coating the catalyst surface with a thin hydrophobic coating such as polytetrafluoroethylene (PTFE) or siloxane not only does not affect ozone molecule diffusion but also prevents water molecules from contacting the active sites, making it suitable for extreme high-humidity conditions. Zeolite-supported ozone decomposition catalysts used in fruit and vegetable preservation warehouses, after being modified with a siloxane coating, maintain a stable decomposition efficiency of over 90% under low-temperature, high-humidity conditions (85% humidity, 5°C), solving the problem of easy deactivation of traditional catalysts.

Through modification of active components, carrier optimization, process upgrades, and surface coating modification, the moisture resistance of ozone decomposition catalysts can be effectively improved, making them suitable for various high-humidity conditions, extending catalyst lifespan, and ensuring long-term stable operation of ozone treatment.

Author: Hazel 

Date: 2026-03-10