Denitrification catalyst is the core of selective catalytic reduction (SCR) technology and is widely used in power, steel, cement and other industries. According to process requirements and flue gas characteristics, different types of catalysts have their own characteristics in performance and applicable scenarios. The following are several types of common denitrification catalysts and their advantages and disadvantages.

1. Honeycomb catalyst
Features: The honeycomb catalysts has a honeycomb structure and is usually made of materials such as titanium titanate (TiO₂) and vanadium pentoxide (V₂O₅).

Advantages: Large specific surface area, sufficient gas contact, and high denitrification efficiency (up to more than 90%). Low pressure drop and low energy consumption. Suitable for high-velocity flue gas with good impact resistance.
Disadvantages: Complex manufacturing and high cost. Not suitable for flue gas with high dust or impurity content, easy to clog.
Application scenario: Denitrification of high-velocity flue gas in thermal power plants and chemical industries.

2. Flat plate catalyst
Features: Flat plate structure, the catalyst is evenly coated on the substrate.

Advantages: Strong thermal stability, suitable for high-temperature flue gas (above 350°C). Strong resistance to sulfide. Easy to install and maintain.
Disadvantages: Lower specific surface area than honeycomb type, slightly lower catalytic efficiency. Affected by the gas flow rate distribution, stable operating conditions are required.
Application scenario: high temperature and high sulfur conditions, such as steel and cement industries.

3. Ceramic fiber catalyst
Features: Ceramic fiber is used as a carrier, and the catalyst components are impregnated in the fiber.

Advantages: Light weight, easy to install and replace. Large specific surface area, high denitrification efficiency. The shape can be customized according to the working conditions.
Disadvantages: Sensitive to mechanical shock, not suitable for high-flow flue gas. Long-term operation is prone to fiber breakage, resulting in shortened life.
Application scenario: Conditions that require flexible installation and replacement, such as the chemical and pharmaceutical industries.

4. Activated carbon-based catalyst
Features: Using activated carbon as a carrier, it has denitrification and adsorption functions.

Advantages: It has adsorption effects on various pollutants such as heavy metals and dioxins in flue gas. Resistant to high humidity, suitable for wet flue gas treatment.
Disadvantages: The denitrification efficiency is lower than other types of catalysts. The activated carbon carrier is flammable and has a high safety risk.
Application scenarios: waste incineration plants, industries that need to treat multiple pollutants at the same time.

5. Metal-based catalysts
Features: Stainless steel or alloy as the substrate, with active materials coated on the surface.

Advantages: High temperature resistance, can be used under conditions above 450°C. Strong wear resistance, suitable for high dust conditions. Long service life and low maintenance cost.
Disadvantages: High material cost. Limited active surface area, slightly lower denitrification efficiency.
Application scenarios: High temperature and high dust environment, such as cement kiln tail flue gas treatment.

6. Low temperature catalysts
Features: Can operate at low temperatures of 150-250°C.

Advantages: It can maintain high denitrification performance under low temperature conditions and is suitable for waste heat recovery systems. Reduce the energy cost required for flue gas heating.
Disadvantages: It is easily affected by ammonium sulfate in the flue gas components and may block the catalyst pores. It is not suitable for high humidity environments.
Application scenario: low-temperature flue gas emission scenario, such as boiler tail gas treatment.

Key factors for selecting catalysts
Operating conditions: including flue gas temperature, flow rate, composition (such as sulfur content, dust concentration).
Emission standards: determine the target denitrification efficiency and select catalysts with appropriate performance.
Economic efficiency: balance the initial cost with long-term operation and maintenance costs.
Plant design: consider the convenience of catalyst installation and replacement.
خلاصه
Different types of کاتالیزورهای نیترات زدایی have their own advantages and disadvantages. Enterprises need to choose suitable products according to their own operating characteristics and environmental protection goals. Reasonable selection and maintenance can not only ensure environmental protection standards, but also maximize cost-effectiveness, providing strong support for the sustainable development of enterprises.