Durability Assessment of Diesel Cold Start Concept (dCSC™) Technologies

From metal-supported oxides to well-defined metal site zeolites: the next generation of passive NOxadsorbers for low-temperature control of emissions from diesel engines

“…19,35 In fact, researchers at Johnson Matthey have developed the Diesel Cold Start Concept (dCSC TM ) based on this technology. 15,[36][37] Preliminary results with the zeolitebased PNA materials have shown an improved NO adsorption capacity together with a better (hydro)thermal stability and poisoning resistance compared to the metal-supported PNA oxides. 19 The acquired knowledge during the design of metal-supported PNA oxides, combining the catalyst syntheses and mechanistic assessments on NOx adsorption/desorption, together with the experience obtained during years of research in the design of Pd-containing zeolites as potential hydrocarbon SCR catalysts, [38][39][40] have allowed the proposal of different metalcontaining zeolites as efficient passive NOx adsorbers.…”

Development of a 2D SCR Catalyst on a Diesel Particulate Filter Model for Design and Control Applications to a Ultra Low NOx Aftertreatment System

“…The system in Figure 7.4 can also be coupled with a dCSC T M [68] [69] upstream of the SCR-F instead of the DOC to enable NO x storage during cold start resulting in lower NO x emissions for the entire Federal Test Procedure (FTP). Such a setup would make it easier to meet the future California 0.02 g/bhp-hr NO x standards.…”

AN EXPERIMENTAL STUDY OF A PASSIVE NOx ADSORBER (PNA) FOR THE REDUCTION OF COLD START DIESEL EMISSIONS

“…Storing NOx and HC emissions until the ATS is at operating temperature is a promising strategy. This can be achieved through the use of a PNA catalyst with zeolites to trap HC [1, 5,8]. Figure 1.1 shows a schematic of proposed ULN ATS configurations compared to today's ATS systems [9].…”

“…The device consists of a PNA with HC trapping ability on an oxidation catalyst i.e. the Diesel Cold Start Concept (dCSC™) [1,8]. The goal of this catalyst is to store emissions while the downstream ATS heats up.…”

“…Externally heating the downstream ATS will reduce the time the PNA has to adsorb NOx, HC, and CO emissions and improve ATS efficiency [4,5,9]. Once the downstream ATS is at its operating temperature, the dCSC™ will release these emissions to the downstream ATS to be reduced and oxidized [5,8]. The ATS will have a complex control system that will require accurate thermal management in order to achieve desired tailpipe emissions [10].…”