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Diesel exhaust-gas reforming for H2 addition to an aftertreatment unit

Abu-Jrai, A., Tsolakis, A., Theinnoi, K., Megaritis, A. and Golunski, Stanislaw E. 2008. Diesel exhaust-gas reforming for H2 addition to an aftertreatment unit. Chemical Engineering Journal 141 (1-3) , pp. 290-297. 10.1016/j.cej.2007.12.028

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The work described in this paper has been undertaken as part of the design of an integrated system comprising a diesel engine, an exhaust-gas fuel reformer and a NOx aftertreatment unit. The exhaust-gas reformer is used to provide hydrogen-rich reformate to the NOx aftertreatment unit, containing a hydrocarbon-SCR catalyst, in order to improve its NOx reduction activity at low exhaust-gas temperatures. The reformer configuration and operating parameters have been examined in order to optimise the performance of the hydrocarbon-SCR catalyst, which is promoted by the presence of H2 but inhibited by CO. The length of the catalyst bed inside the reformer is a key factor in determining the extent to which the water-gas shift reaction can contribute to the reforming process, and therefore strongly influences the proportions of CO and H2 in the reformate. However, it is also necessary for the reactant ratios at the reformer inlet to be controlled in response to changes in the engine operating conditions. In practice, this means that the rate of fuel addition to the reformer needs to be optimised for different exhaust gas compositions and space velocities.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Fuel reforming; Exhaust aftertreatment; Hydrocarbon-SCR; Hydrogen; Platinum catalyst
Publisher: Elsevier
ISSN: 1385-8947
Last Modified: 08 Jan 2020 03:43

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