Cold-Start Emissions Control in Hybrid Vehicles Equipped with a Passive Hydrocarbon and NOx Adsorber

Gao, Zhiming; Kim, Miyoung; Choi, Jae-Soon; Daw, C Stuart; Parks Ii, James E.; Smith, David E.

doi:10.1177/0954407012443764

Title: Cold-Start Emissions Control in Hybrid Vehicles Equipped with a Passive Hydrocarbon and NOx Adsorber

Journal Article · Mon Oct 01 00:00:00 EDT 2012 · Proceedings of the Institution of Mechanical Engineers. Part D, Journal of Automobile Engineering

DOI:https://doi.org/10.1177/0954407012443764· OSTI ID:1049791

^[1]; Kim, Miyoung ^[1];

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ORNL

We presents a study of the potential for using low-cost sorbent materials (i.e. Ag-Beta-zeolite and Fe-Mn-Zr transition metal oxides) to temporally trap hydrocarbons (HCs) and nitrogen oxides (NOx) emissions during cold-start periods in HEVs and PHEVs over transient driving cycles. The adsorption behavior of the candidate sorbent materials was characterized in our laboratory flow reactor experiments. The parameters were then used to develop a one-dimensional, transient device model which has been implemented in the Powertrain Systems Analysis Toolkit (PSAT) to simulate a passive HC and NOx absorber device. The results show that such an absorber can substantially reduce HC and NOx emissions by storing them when the 3-way catalyst is too cool to function and re-releasing them when the exhaust temperature rises. These improved emission controls do not involve any penalty in fuel consumption or require any change in engine operation. The cost of these sorbent materials is also much less than conventional 3-way catalysts.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1049791

Journal Information:: Proceedings of the Institution of Mechanical Engineers. Part D, Journal of Automobile Engineering, Vol. 226, Issue D10; ISSN 0954-4070

Country of Publication:: United States

Language:: English

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