Browse Publications Technical Papers 2006-01-0641
2006-04-03

A Preliminary Evaluation of Unregulated Emissions During Low Temperature Operation of a Small Diesel Engine with a Multi-Function SCR Catalyst 2006-01-0641

Ammonia (NH3) slip from the selective catalytic reduction (SCR) of NOx process using urea or NH3 is a rather unavoidable phenomenon especially when the operation temperature is relatively low, or a sudden change in load is observed. As a possible solution to this issue, a unique vanadium-free titania-based SCR catalyst, which can treat excess NH3 within itself, was examined its capability to destroy NH3 slip from SCR catalysts using small diesel engine test equipment. With this unique SCR catalyst, a relatively to considerably high conversion rate of NH3 was achieved even at 175-200°C. Compared with this, a conventional oxidation catalyst as an NH3 slip control device showed poor performance in NH3 conversion at the same temperature range. Further, at higher temperatures, the conventional oxidation catalyst produced a considerable amount of nitrous oxide (N2O), while the multi-function SCR catalyst could prevent N2O formation almost completely or suppress to a significantly low level.

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