CPC F01N 3/208 (2013.01) [B01J 23/72 (2013.01); B01J 37/08 (2013.01); F01N 3/0885 (2013.01); F01N 2510/063 (2013.01); F01N 2570/14 (2013.01); F01N 2570/18 (2013.01); F01N 2610/03 (2013.01)] | 10 Claims |
1. A method, comprising:
predicting a sulfur exposure of one or more copper-zeolite catalysts deployed in an exhaust aftertreatment system;
comparing the predicted sulfur exposure to a predefined sulfur exposure threshold, the predefined sulfur exposure threshold being an amount of sulfur present in the exhaust gas for a first predefined time period, wherein the predefined sulfur exposure threshold is greater than 1 gram of sulfur per liter of exhaust gas (gS/L);
receiving a fault code indicating that a NOx amount in exhaust gas leaving the exhaust aftertreatment system is above a predefined high NOx amount threshold;
in response to the comparison indicating that the predicted sulfur exposure of the one or more copper-zeolite catalysts is at or above the predefined sulfur exposure threshold and receiving the fault code, heating the one or more copper-zeolite catalysts to a predefined heat treatment temperature to desulfate the one or more copper-zeolite catalysts;
starting a timer in response to a temperature of the heated one or more copper-zeolite catalysts increasing by a predefined amount; and
stopping the heating of the one or more copper-zeolite catalysts based on the timer indicating that a second predefined time period has elapsed, wherein the second predefined time period is based on the predefined heat treatment temperature.
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