Figure 1 - uploaded by Joseph F McDonald
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Schematic representation of the layout and function of the exhaust emission control system during desulfation.
Source publication
A 5.9 liter medium-heavy-duty diesel engine, equipped with a diesel exhaust emission control system consisting of catalyzed diesel particulate filters (CDPF) and NOx adsorber catalysts arranged in a dual-path configuration, was evaluated with the goal of developing desulfation strategies for in-use NOx adsorber desulfation. NOx adsorber desulfation...
Context in source publication
Context 1
... Modifications were made to the previously described system for the purpose of sulfur removal from the catalyst. Figure 1 is a functional schematic of the exhaust emission control system tested with the Cummins ISB engine. Modifications to the previously described system include the addition of an exhaust bypass pathway located downstream of the secondary fuel injectors and upstream of the CDPFs. ...
Citations
... The results of the first, second, and third testing phases have been previously reported. 1,2,3 The results of phases 1 and 2 have shown that NO x adsorbers can achieve NO x reductions efficiencies greater than ninety percent after a modest accumulation of hours. 1,2 Current adsorber formulations have been shown to lose NO x reduction performance over time. ...
... Summary of major engine specifications.3 ...
A 5.9-liter medium-heavy-duty diesel engine, equipped with a diesel exhaust emission control system consisting of catalyzed diesel particulate filters and NO x adsorber catalysts arranged in a dual flow path configuration was evaluated with the goal of studying the thermal aging characteristics of a number of NO x adsorber formulations. These adsorbers were tested with near zero sulfur fuel and low sulfur engine oil to minimize the impact of sulfur poisoning on the test results. Testing was performed at a high temperature engine operating mode to provide accelerated but not abusive aging. The test duration ranged from 100 to 250 hours depending on the severity of the aging at the 100 hour mark. The initial "zero" sulfur testing screened the NO x adsorber formulations for future testing and established a thermal aging baseline.
