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Development of deNOx Catalyst Based on Ag/Al2O3 Catalyst for Diesel Applications
Technical Paper
2002-01-1724
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Ag/Al2O3 was studied as a HC-SCR (Hydrocarbon - Selective Catalytic Reduction) catalyst for diesel application[1, 2 and 3]. Performance required of (or from) this catalyst is high NOx conversion with high thermal durability and sulfur resistance. Also low HC slip is desired. The Ag/Al2O3 system was improved by addition of additives.
In the diesel 13-mode (Japan) evaluation, improved Ag/Al2O3 catalyst showed higher de-NOx activity (>50%) compared to the original when fresh. Improved Al2O3 catalyst showed smaller hysteresis of de-NOx activity between ramping up and down the temperature and smaller amount of HC slip.
To study the improvement effect, interactions between the HC and catalyst were investigated by TG/DTA-MS (define) and FT-IR (define). TG/DTA measurement results showed that HC/O2 reaction was restrained in the improved catalyst. These results suggest that there was sufficient of HC for NOx reduction on the improved catalyst.
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Citation
Nagashima, K., Nagata, M., Katou, K., Sod, K. et al., "Development of deNOx Catalyst Based on Ag/Al2O3 Catalyst for Diesel Applications," SAE Technical Paper 2002-01-1724, 2002, https://doi.org/10.4271/2002-01-1724.Also In
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