2D Oxide Catalyst for Visible Light Active VOC Degradation

Overview

This solution addresses the limitations of conventional UV-active photocatalysts used in indoor air purification systems. Current commercial air purification technologies based on photocatalytic oxidation rely on UV-active materials such as TiO2, which suffer from low degradation efficiency, surface deactivation, limited stability, and the formation of toxic by-products including ozone.

The proposed technology offers a visible light active 2D oxide photocatalyst filter with high conversion efficiency, designed for easy integration into existing indoor air purifiers. Visible light active photocatalysts, particularly 2D oxides, offer advantages including large surface area, tunable band gap, and ease of processing, making them well suited for incorporation into commercial air purification products.

Technical specifications

Key features:

• Visible light active photocatalyst that operates without requiring UV illumination, eliminating ozone generation
• 2D oxide materials including doped TiO2, WO3, and Co3O4 synthesized through wet chemical and spray pyrolysis approaches
• Compatibility with multiple filter matrix substrates including ceramic, stainless steel mesh, activated carbon, and porous stainless steel
• Demonstrated formaldehyde degradation of up to 50 percent using a customized gas analyzer test setup
• Tunable band gap and large surface area enabling broad VOC contaminant targeting including formaldehyde, benzene, toluene, and xylene
• Scalable coating process suitable for commercial-size filter production

Technical approach:

The catalyst synthesis process covers transition metal oxides and 2D oxides. Coating techniques have been developed for application onto commercially compatible filter matrices. A customized test setup enables performance evaluation of matrix-coated catalysts under variable environmental conditions including temperature, humidity, light intensity, catalyst loading, and VOC concentration and type. By-product formation is analyzed through gas chromatography to ensure safe and complete mineralization.

Technology readiness level

The technology is at an early-to-mid stage of development. Preliminary synthesis processes for visible light active catalysts including doped TiO2, WO3, and Co3O4 have been established. Initial coating studies on ceramic and stainless steel mesh substrates have been completed, and a customized test setup has been designed and used to demonstrate up to 50 percent formaldehyde degradation. Optimization studies covering environmental parameters, catalyst loading, and VOC type and concentration are currently in progress. Future work includes comprehensive structural, optical, and morphological characterization, coating adhesion and uniformity optimization, mechanistic degradation studies across multiple VOC contaminants, by-product analysis, and scaling the optimal catalyst formulation to commercial-size filters.