Effect of biofuel- and lube oil-originated sulfur and phosphorus on the performance of Cu-SSZ-13 and V2O5-WO3/TiO2 SCR catalysts
Journal article, 2021

Two different SCR catalysts, V2O5-WO3/TiO2 and Cu-SSZ-13, were exposed to biodiesel exhausts generated by a diesel burner. The effect of phosphorus and sulfur on the SCR performance of these catalysts was investigated by doping the fuel with P-, S-, or P + S-containing compounds. Elemental analyses showed that both catalysts captured phosphorus while only Cu-SSZ-13 captured sulfur. High molar P/V ratios, up to almost 3, were observed for V2O5-WO3/TiO2, while the highest P/Cu ratios observed were slightly above 1 for the Cu-SSZ-13 catalyst. Although the V2O5-WO3/TiO2 catalyst captured more P than did the Cu-SSZ-13 catalyst, a higher degree of deactivation was observed for the latter, especially at low temperatures. For both catalysts, phosphorus exposure resulted in suppression of the SCR performance over the entire temperature range. Sulfur exposure, on the other hand, resulted in deactivation of the Cu-SSZ-13 catalyst mainly at temperatures below 300-350 °C. The use of an oxidation catalyst upstream of the SCR catalyst during the exhaust-exposure protects the SCR catalyst from phosphorus poisoning by capturing phosphorus. The results in this work will improve the understanding of chemical deactivation of SCR catalysts and aid in developing durable aftertreatment systems.

sulfur

biodiesel exhaust

NH -SCR 3

V O -WO /TiO 2 5 3 2

phosphorus

Cu-SSZ-13

Author

Sandra Dahlin

Royal Institute of Technology (KTH)

Johanna Englund

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Henrik Malm

Umicore Denmark ApS

Matthias Feigel

Technical University of Munich

Björn Westerberg

Scania CV AB

Francesco Regali

Scania CV AB

Magnus Skoglundh

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Lars Pettersson

Royal Institute of Technology (KTH)

Catalysis Today

0920-5861 (ISSN)

Vol. 360 326-339

Subject Categories

Chemical Process Engineering

Other Chemical Engineering

Other Chemistry Topics

DOI

10.1016/j.cattod.2020.02.018

More information

Latest update

1/4/2021 1