A Review on Resource Utilization of Spent V-W-Ti Based Selective Catalytic Reduction Catalysts

Area of Science:

• Environmental chemistry
• Materials science
• Catalysis

Background:

• Selective catalytic reduction (SCR) catalysts (V2O5-WO3/TiO2) mitigate nitrogen oxide pollution but generate hazardous spent catalysts.
• Disposal of spent SCR catalysts in landfills wastes valuable metals and poses environmental risks, particularly in thermal power generation-heavy regions.

Purpose of the Study:

• To review current methods for recovering metals (V, W, Ti) from spent SCR catalysts.
• To explore the conversion of spent SCR catalysts into value-added photocatalysts.
• To identify research trends and improve the atomic efficiency of metal recovery for photocatalyst production.

Main Methods:

• Literature review of spent SCR catalyst regeneration and elemental extraction processes.
• Analysis of existing methods for V, W, and Ti recovery.
• Exploration of pathways for converting recovered elements into photocatalytic materials.

Main Results:

• Current recovery methods yield V, W, and Ti, but atomic efficiency for photocatalyst production is often unsatisfactory.
• Research is shifting towards enhancing the added value of recovered products, with photocatalysis being a promising application.
• Spent SCR catalysts represent a potential new resource for cost-effective photocatalyst production.

Conclusions:

• Regeneration and elemental extraction from spent SCR catalysts are crucial for resource recovery and environmental protection.
• Converting spent SCR catalysts into photocatalysts offers a high-value application, addressing limitations in current recovery methods.
• This approach provides a sustainable and economical source for photocatalyst materials, reducing reliance on virgin resources.