Research on structural strengthening technology for regenerative denitration catalysts
Dongliang Ji1, Dongxue Jiang2, Yang Li3
1College of Environment and Ecology, Jiangsu Open University, Nanjing, 210036, China.
Regenerating spent selective catalytic reduction (SCR) catalysts using aluminum sulfate significantly improves structural strength and activity. This cost-effective method offers a sustainable solution for flue gas denitration, reducing hazardous waste.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- High costs associated with replacing and disposing of failed selective catalytic reduction (SCR) catalysts as hazardous waste.
- Potential for cost reduction in flue gas denitration by recovering and regenerating used SCR catalysts.
- Existing challenge: regenerated SCR catalysts exhibit insufficient structural strength and activity for effective use.
Purpose of the Study:
- To investigate the use of aluminum dihydrogen phosphate, aluminum nitrate, and aluminum sulfate as strengthening agents for regenerating SCR catalysts.
- To compare different preparation techniques, including over-impregnation, drumming-assisted impregnation, and ultrasonic-assisted preparation.
- To identify factors influencing the structural strength, physical properties, and catalytic activity of the regenerated catalysts.
Main Methods:
- Regeneration of SCR catalysts using three different aluminum-based strengthening agents.
- Comparison of three impregnation techniques: over-impregnation, drumming-assisted impregnation, and ultrasonic-assisted preparation.
- Analysis of regenerated catalyst properties: compressive strength, wear rate, H2-TPR, NH3-TPD, and in situ IR spectroscopy.
Main Results:
- Drumming-assisted impregnation in a 16% aluminum sulfate solution yielded the best results.
- Achieved compressive strength of 4.57 MPa and a wear rate of 0.088% kg-1.
- Demonstrated a denitration efficiency of 58% after 10 minutes, indicating improved catalytic activity.
Conclusions:
- Aluminum sulfate is an effective strengthening agent for regenerating SCR catalysts, significantly enhancing structural integrity and performance.
- Drumming-assisted impregnation is a superior technique for achieving improved catalyst properties.
- A synergistic approach combining activity and structural strengthening is crucial for developing advanced regenerated SCR catalysts.
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