Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 113, Issue -, Pages 160-171Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2011.11.033
Keywords
Flame spray pyrolysis; NOx storage-reduction (NSR); Mono- and bimetallic catalyst; Platinum; Rhodium; Alumina; Barium carbonate; Selective deposition; Fast NOx storage; Lean NOx trap; Sulfur poisoning
Funding
- ETH Zurich [TH-09 06-2]
- European Research Council/European Community
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Mono- and bimetallic Rh and Pt based NOx storage-reduction (NSR) catalysts, where the noble metals were deposited on the Al2O3 support or BaCO3 storage component, have been prepared using a twin flame spray pyrolysis setup. The catalysts were characterized by nitrogen adsorption. CO chemisorption combined with diffuse reflectance infrared Fourier transform spectroscopy, X-ray diffraction, and scanning transmission electron microscopy combined with energy dispersive X-ray spectroscopy. The NSR performance of the catalysts was investigated by fuel lean/rich cycling in the absence and presence of SO2 (25 ppm) as well as after H-2 desulfation at 750 degrees C. The performance increased when Rh was located on BaCO3 enabling good catalyst regeneration during the fuel rich phase. Best performance was observed for bimetallic catalysts where the noble metals were separated, with Pt on Al2O3 and Rh on BaCO3. The Rh-containing catalysts generally showed much higher tolerance to SO2 during fuel rich conditions and lost only little activity during thermal aging at 750 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
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