Development of a Kinetic Model to Evaluate Water Storage on Commercial Cu-Zeolite SCR Catalysts during Cold Start

2017-01-0968

03/28/2017

Features
Event
WCX™ 17: SAE World Congress Experience
Authors Abstract
Content
Commercial Cu-Zeolite SCR catalyst can store and subsequently release significant amount of H2O. The process is accompanied by large heat effects. It is critical to model this phenomenon to design aftertreatment systems and to provide robust tuning strategies to meet cold start emissions and low temperature operation. The complex reaction mechanism of water adsorption and desorption over a Cu-exchanged SAPO-34 catalyst at low temperature was studied through steady state and transient experiments. Steady state isotherms were generated using a gravimetric method and then utilized to predict water storage interactions with respect to feed concentration and catalyst temperature. Transient temperature programmed desorption (TPD) experiments provided the kinetic information required to develop a global kinetic model from the experimental data. The model captures fundamental characteristics of water adsorption and desorption accompanied by the heat effects. Steady state test cell and transient truck data were used as a part of the water storage model verification and validation. The kinetic model predicts water storage well, aiding in system evaluation of level control to understand its impact on cold start emissions.
Meta TagsDetails
DOI
https://doi.org/10.4271/2017-01-0968
Pages
7
Citation
Srinivasan, A., Joshi, S., Tang, Y., Wang, D. et al., "Development of a Kinetic Model to Evaluate Water Storage on Commercial Cu-Zeolite SCR Catalysts during Cold Start," SAE Technical Paper 2017-01-0968, 2017, https://doi.org/10.4271/2017-01-0968.
Additional Details
Publisher
Published
Mar 28, 2017
Product Code
2017-01-0968
Content Type
Technical Paper
Language
English