Regenerable ceria-based SOx traps for sulfur removal in lean exhausts
Journal article, 2008

Bare and Pt-containing CeO2, Al2O3:MgO mixed oxide and Al2O3 have been investigated as potential regenerable sulfur oxides (SOx) traps. The samples were evaluated by lean SOx adsorption and temperature programmed desorption using synthetic gas compositions. In addition, combined DRIFT spectroscopy and mass spectrometry were employed to obtain mechanistic information on the adsorption of SOx. The results suggest Pt/CeO2 as promising SOx trap material owing to a high storage capacity at 250 8C in combination with efficient release above 600 8C. The presence of Pt is generally found to enhance the lean SOx storage capacity at 250C for CeO2-based samples. Lean SO2 adsorption on CeO2 is found to proceed via the formation of surface and bulk sulfates, where the latter is formed more rapidly for the Pt-containing CeO2 sample. Ceria samples pre-exposed to high amounts of SO2 at 250 and 400C show lower SOx storage capacity and higher SOx release as compared to fresh samples. This indicates that under the conditions used in this study, a part of the storage sites on CeO2 are nonregenerable.

sulfur oxide

FTIR spectroscopy

storage mechanism

Pt

CeO2

Author

Lisa Kylhammar

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Per-Anders Carlsson

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Hanna Härelind Ingelsten

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Henrik Grönbeck

Chalmers, Applied Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Magnus Skoglundh

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Applied Catalysis B: Environmental

0926-3373 (ISSN) 1873-3883 (eISSN)

Vol. 83 1-2 268-276

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Chemical Process Engineering

Materials Chemistry

Other Materials Engineering

DOI

10.1016/j.apcatb.2008.04.003

More information

Latest update

11/5/2018