Browse Publications Technical Papers 2013-01-1065
2013-04-08

Mitigation of Platinum Poisoning of Cu-Zeolite SCR Catalysts 2013-01-1065

A typical diesel exhaust emission control system for meeting the US EPA 2010 regulations includes one or more platinum-group metal (PGM)-containing catalysts, located upstream of an SCR unit. However, as was previously reported in literature, under certain operating conditions PGM elements can get transferred onto the downstream SCR catalyst, resulting in the loss of its NOx conversion efficiency. In the same studies, the effect of Pt poisoning was found to be mitigated by catalyst treatment at 850°C, presumably due to Pt volatilization and migration.
In the present study, we have explored the process of Pt poisoning mitigation, and identified that the recovery can take place at lower temperatures, reducing the risk of hydrothermal damage to the catalyst. We have also proven that the performance recovery, observed upon treatment at 700°C, was induced by Pt sintering, rather than by volatilization, thus minimizing the risk of secondary poisoning via Pt redistribution across the SCR system. These findings pave the way for the practical rejuvenation of zeolite-based SCR catalysts, deactivated through Pt contamination.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 17% off list price.
Login to see discount.
We also recommend:
TECHNICAL PAPER

Soot Loading Estimation Accuracy Improvement by Filtration Layer Forming on DPF and New Algorithm of Pressure Loss Measurement

2013-01-0525

View Details

JOURNAL ARTICLE

Cold Start Effect Phenomena over Zeolite SCR Catalysts for Exhaust Gas Aftertreatment

2013-01-1064

View Details

TECHNICAL PAPER

Durability Investigation on Aluminum Titanate-Diesel Particulate Filter Having Asymmetric Hexagonal Cell Design

2013-01-0841

View Details

X