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Issue 9, 2018
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A PGM-free NOx adsorber + selective catalytic reduction catalyst system (AdSCR) for trapping and reducing NOx in lean exhaust streams at low temperature

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Abstract

Low-temperature operation of urea/NH3-SCR converters, required by recent emission regulations, is challenging due to technological limits related to poor catalytic activity, difficult urea decomposition and undesired ammonium nitrate formation. Herein, we present a novel concept of a catalytic device, which adds a NOx storage functionality to a typical SCR catalyst. This enables capture and storage of NOx in lean exhaust streams already at room temperature, with significant efficiencies under dry conditions, as well as direct reduction of the stored NOx at higher temperatures. The proposed system (AdSCR = adsorption + selective catalytic reduction) is intrinsically different from the well-known existing NOx storage reduction (LNT) + SCR systems. In fact, it is free of PGM materials and does not require lean–rich cycling, being operated just like an SCR catalyst. It has therefore potential advantages both in terms of costs and flexibility of the aftertreatment configuration: in principle, it can be integrated into conventional SCR converters, leading to improved deNOx efficiencies without additional modifications of the aftertreatment architecture.

Graphical abstract: A PGM-free NOx adsorber + selective catalytic reduction catalyst system (AdSCR) for trapping and reducing NOx in lean exhaust streams at low temperature

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Publication details

The article was received on 15 Feb 2018, accepted on 02 Apr 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C8CY00343B
Citation: Catal. Sci. Technol., 2018,8, 2467-2476
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    A PGM-free NOx adsorber + selective catalytic reduction catalyst system (AdSCR) for trapping and reducing NOx in lean exhaust streams at low temperature

    T. Selleri, F. Gramigni, I. Nova, E. Tronconi, S. Dieterich, M. Weibel and V. Schmeisser, Catal. Sci. Technol., 2018, 8, 2467
    DOI: 10.1039/C8CY00343B

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