Chemical Engineering Journal 336 (2018) 531–543 Contents lists available at ScienceDirect Chemical Engineering Journal journal homepage: www.elsevier.com/locate/cej Sustained concentration and temperature oscillations in a diesel oxidation catalyst ⁎ ⁎ Po-Yu Peng, Michael P. Harold , Dan Luss Department of Chemical & Biomolecular Engineering, University of Houston, Houston 77204-4004, United States GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: A diesel oxidation catalyst (DOC) comprising an alumina-based washcoat of Platinum (Pt) and Palladium (Pd) is Hydrocarbon trap used to catalyze the oxidation of a diesel exhaust containing hydrocarbons (HCs) with suﬃciently high con- Beta-zeolite version. A large-pore zeolite such as Beta (BEA) is added to the DOC to trap diesel exhaust hydrocarbons during Diesel oxidation catalyst the cold start. There is a need to gain insight on how BEA aﬀects the performance of the HC light-oﬀ and of the Oscillations transient HC oxidation. We conducted steady-state and transient trapping experiments involving the n-dodecane Dodecane in order to enable improved trap design and operating strategy. Simultaneous spatio-temporal measurements of Oxidation concentration and temperature, respectively by spatially-resolved mass spectrometry and coherent optical fre- Platinum quency domain reﬂectometer, provide detailed insight into the reactor dynamics. Steady-state experiments re- veal unexpected periodic oscillations
Chemical Engineering Journal – Elsevier
Published: Mar 15, 2018
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