Denitrification activity test of a V modified Mn-based ceramic filter.

Area of Science:

• Environmental Science
• Materials Science
• Chemical Engineering

Background:

• Single manganese-based catalysts exhibit limitations in high-temperature denitrification, including poor resistance to water and sulfur.
• Developing robust catalysts is crucial for effective industrial exhaust gas treatment.

Purpose of the Study:

• To develop a novel vanadium-manganese-based ceramic filter (VMA(14)-CCF) with enhanced denitrification performance and durability.
• To evaluate the catalytic activity, pressure drop, and resistance to poisoning of the new material.

Main Methods:

• Vanadium-manganese-based ceramic filter (VMA(14)-CCF) prepared via a modified impregnation method.
• Characterization using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) analysis.
• Evaluation of NO conversion efficiency, pressure drop, and resistance to water, sulfur, and alkali metal poisoning across various temperatures and face velocities.

Main Results:

• VMA(14)-CCF achieved over 80% NO conversion in the temperature range of 175-400 °C, reaching 100% conversion between 225-300 °C.
• The filter maintained high NO conversion and low pressure drop across all tested face velocities.
• VMA(14)-CCF exhibited superior resistance to water, sulfur, and alkali metal poisoning compared to single manganese-based filters.
• Characterization revealed that vanadium introduction protects the MnO center, promotes Mn4+ formation, and enhances surface adsorbed oxygen.

Conclusions:

• The developed VMA(14)-CCF offers excellent high-temperature denitrification efficiency and improved durability.
• Vanadium modification significantly enhances the catalytic properties and resistance to common poisons.
• VMA(14)-CCF presents a promising solution for broadening the application of ceramic filters in industrial denitrification processes.