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A Durable and Efficient Cu Zeolite based SCR Catalyst for Cold Start and High Temperature DeNOx Applications
Technical Paper
2021-26-0190
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Typical diesel engine-out emissions consist of hydrocarbons (HC), carbon monoxide (CO), particulate matter (PM) & oxides of nitrogen (NOx). The HC and CO emissions are oxidized by a diesel oxidation catalyst (DOC), placed upstream, closer to the exhaust manifold. The DOC is often followed by a diesel particulate filter (DPF), which entraps and combusts PM. The NOx is often controlled by a selective catalytic reduction (SCR) catalyst. An SCR catalyst commonly uses NH3 to reduce the NOx to N2. Vanadium-based SCR catalysts have been widely used for many years. More recently, Cu-Zeolite based SCR (CuZ-SCR) is gaining much attention primarily due to the potential environmental hazards of vanadium and a wider temperature window of effective operation. The SCR reaction is facilitated by the presence of NO2 at lower exhaust gas temperatures by means of the so-called “fast” reaction. However, this is only advantageous up to about 300°C. At higher temperatures, the contribution of NO2 is insignificant, since mass transfer & diffusion phenomenon become dominant in NOx conversion enabling the “standard” SCR reaction to proceed.
In this study, the CuZ-SCR catalyst performance was tested as fresh and as high temperature aged (>800°C) on an engine test bed using a 0.7 L diesel engine and Non-Road Steady-state Cycle (NRSC). The NOx conversion efficiency of the CuZ-SCR catalyst during alpha (NH3/NOx) changes, NO2/NOx ratio changes and space velocity changes was established. Entire Full Useful Life (FUL) NOx emission control performance was evaluated for a novel CuZ-SCR catalyst placed downstream of a DOC & DPF in a DOC+DPF+SCR catalyst system. In order to evaluate FUL durability, including high temperature durability (exotherm functions) with multiple active DPF regeneration events (≥600°C) and sulfation/desulfation events, the catalyst system was exposed to a customized cycle for continuous 450 aging cycles, equivalent to the FUL thermal load and sulfur exposure of a vehicle over 160000 km. The performance of the novel CuZ-SCR catalyst was tested using the NRSC 8-mode test cycle after every continuous 50 cycles in 450 aging cycles. The results show that the novel Cu-ZSCR catalyst has excellent NOx reduction performance over a wide temperature range from low to high, as well as excellent durability to FUL.
Authors
- Vishnuvarthan Muthusamy - Ecocat India Pvt, Ltd.
- Ajith Kallakkavumkal - Ecocat India Pvt Ltd
- Kanishka Gaur - Ecocat India Pvt Ltd
- Ritwik Raman - Ecocat India Pvt Ltd
- Arvind Kumar - Ecocat India Pvt Ltd
- Bosco Rajan - Ecocat India Pvt Ltd
- Gordon Bartley - Ecocat India Pvt Ltd
- Alok Trigunayat - Ecocat India Pvt Ltd
Topic
Citation
Muthusamy, V., Kallakkavumkal, A., Gaur, K., Raman, R. et al., "A Durable and Efficient Cu Zeolite based SCR Catalyst for Cold Start and High Temperature DeNOx Applications," SAE Technical Paper 2021-26-0190, 2021, https://doi.org/10.4271/2021-26-0190.Data Sets - Support Documents
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