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Mono- and bimetallic Rh and Pt NSR-catalysts prepared by controlled deposition of noble metals on support or storage component

Paper ID Volume ID Publish Year Pages File Format Full-Text
46693 46445 2012 12 PDF Available
Title
Mono- and bimetallic Rh and Pt NSR-catalysts prepared by controlled deposition of noble metals on support or storage component
Abstract

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 H2 desulfation at 750 °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 °C.

Graphical abstract. Mono- and bimetallic Rh and Pt based NOx storage-reduction (NSR) catalysts with spatially controlled noble metal deposition were prepared using a twin flame spray pyrolysis setup. All catalysts performed well in the absence of SO2, while in the presence of SO2 Rh was essential.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Mono- and bimetallic Rh and Pt based NSR catalysts were prepared by flame spray pyrolysis. ► Noble metals were selectively deposited on support (Al2O3) and storage component (BaCO3). ► The location of nobe metal deposition had a significant influence on the NSR performance. ► Rh containing catalysts showed superior NSR efficiency in the presence of SO2. ► Combinations of Rh and Pt enhanced the NSR performance of the catalysts.

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
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 113–114, 22 February 2012, Pages 160–171
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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