ammonia for a SCR are:

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:

Several secondary reactions also occur:

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With urea, the reactions are:

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:

As with ammonia, several secondary reactions also occur in the presence of sulfur:

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The ideal reaction has an optimal temperature range between 630 and 720 K (357 and 447 °C) but can operate as low as 500 K (227 °C) with longer residence times.

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