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Particulate Filter Substrates with SCR-Functionality Manufactured by Co-extrusion of Ceramic Substrate and SCR Active Material


Schütt, Mathias ; Gallinger, Martin ; Moos, Ralf:
Particulate Filter Substrates with SCR-Functionality Manufactured by Co-extrusion of Ceramic Substrate and SCR Active Material.
In: Topics in Catalysis. Bd. 60 (März 2017) Heft 3 . - S. 204-208.
ISSN 1572-9028
DOI: https://doi.org/10.1007/s11244-016-0598-7


An alternative method to integrate the SCR functionality in diesel particulate filters has been investigated. In contrast to coated filters, SCR active materials like Cu exchanged silico-alumino-phosphates (Cu-SAPO) and acidic CeO₂/ZrO₂ were added directly to the slip and were coextruded with silicon carbide matrix and silicon dioxide glass; the latter serving to bond the SCR active material with the matrix. Due to silicon dioxide glass addition, the extruded honeycomb samples can be hardened at 900 °C. Preliminary investigations proved the stability of the SCR active material at this temperature range. In this work, parameters like slip composition, grain size of the powders and hardening conditions were varied. Measured differential pressures indicated that the manufactured samples have open pores with porosities between 41 and 54 %, making them suitable for particulate filter application. The porosity was controlled by varying the grain sizes of the powder materials as well by the hardening conditions like temperature and time. Initially, the silicon dioxide glass enclosed the SCR active materials and reduced BET surface area, yielding in poor NOx-conversion. By an improved two-step slip preparation method, the BET surface area and the NOx-conversion was increased. A NOₓ-conversion of about 70 % at a feed ratio of 1.5 was achieved at 300 °C in simulated exhaust. We consider this approach worth for being further investigated and improved.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos
Profilfelder > Advanced Fields > Neue Materialien
Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Forschungseinrichtungen > Forschungsstellen > ZET - Zentrum für Energietechnik
Forschungseinrichtungen > Forschungsstellen > BERC - Bayreuth Engine Research Center
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder > Advanced Fields
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 07 Apr 2017 08:42
Letzte Änderung: 07 Apr 2017 08:42
URI: https://eref.uni-bayreuth.de/id/eprint/32381