Combining HC-SCR over Ag/Al2O3 and hydrogen generation over Rh/CeO2-ZrO2 using biofuels: An integrated system approach for real applications
2015 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 162, 583-592 p.Article in journal (Refereed) Published
Abstract We report on a high NOx reduction activity over Ag/Al2O3 catalysts, using hydrogen produced in a fuel reformer. The focus of the study is to evaluate the performance of a hydrocarbon selective catalytic reduction (HC-SCR) catalyst in real conditions. Initially, the catalytic materials for the fuel reformer (Rh/CeO2-ZrO2) and the HC-SCR (Ag/Al2O3) were evaluated in separate bench-scale reactor setups. These two setups were subsequently joined into an integrated bench-scale reactor setup with the aim to evaluate the influence of the reformate on the HC-SCR activity in a controlled environment. In the final phase of the study a 4 wt.% Ag/Al2O3 catalyst doped with 100 ppm(w) Pt was scaled up and tested in a pilot-scale reactor setup. The pilot-scale reactor setup enabled evaluation of the HC-SCR activity in real exhaust gases generated by a single cylinder engine (genset) together with a hydrogen-rich gas supplied from a fuel reformer. Commercial biodiesel (NExBTL) was used as reducing agent for the HC-SCR as well as fuel in the fuel reformer for both the bench-scale and pilot-scale experiments. This study gives an excellent link between evaluations of the catalytic materials, controlled bench-scale experiments and applied engine experiments, proving a viable concept for lean NOx reduction together with onboard hydrogen production. A NOx conversion of above 70% was reached at temperatures below 250 °C, in bench-scale experiments when hydrogen produced in the fuel reformer is added.
Place, publisher, year, edition, pages
2015. Vol. 162, 583-592 p.
HC-SCR fuel reformer integrated system, Ag/Al2O3, Rh/CeO2-ZrO2, Biofuels, Diesel engine
IdentifiersURN: urn:nbn:se:kth:diva-149332DOI: 10.1016/j.apcatb.2014.07.036ISI: 000343686900067ScopusID: 2-s2.0-84905367908OAI: oai:DiVA.org:kth-149332DiVA: diva2:739173
FunderMistra - The Swedish Foundation for Strategic Environmental ResearchSwedish Energy AgencyKnut and Alice Wallenberg Foundation, Dnr KAW 2005.0055
QC 201409022014-08-202014-08-202015-06-23Bibliographically approved