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Investigation of Ag-based low temperature NOx adsorbers

Paper ID Volume ID Publish Year Pages File Format Full-Text
53612 46977 2015 8 PDF Available
Title
Investigation of Ag-based low temperature NOx adsorbers
Abstract

•Ag-based catalysts demonstrate superior H2-assisted NO oxidation activities below 180 °C.•Ag-based catalysts possess optimal H2-assisted NOx storage capacities between 75 and 150 °C.•Sulfur poisoning appears to have a detrimental effect on the dynamic NOx storage efficiencies.

Future emission standards are becoming increasingly stringent as California will phase in LEV III regulations starting in 2015 and EPA will implement Tier 3 regulations starting in 2017. Current vehicles emit greater than 50% of targeted tailpipe emissions during the first minute or two following “cold-start” mainly due to the ineffectiveness of existing catalytic converters at low temperatures (<180 °C). Thus, developing low temperature emission control technologies has become a top priority of automobile manufacturers and their suppliers. In this article, Ag-based catalysts (Ag/Al2O3) were evaluated as a low temperature NOx adsorber using a laboratory fixed-bed flow reactor system. For the first time superior low temperature NO to NO2 conversion efficiencies and NOx storage capacity in the presence of hydrogen were demonstrated. Sulfation and desulfation experiments were conducted to examine the impact of sulfur on the low temperature NOx storage. Several supplier catalysts, including two diesel oxidation catalysts (DOC) and a passive NOx adsorber (PNA), were also tested to provide comparisons to the Ag-based catalysts.

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Keywords
Ag-based catalysts (Ag/Al2O3); Low temperature NOx adsorbers (LTNA); Passive NOx adsorbers (PNA)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 258, Part 2, 1 December 2015, Pages 378–385
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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