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Catalytic purification of car exhausts over cobalt- and copper-based metal oxides promoted with platinum and rhodium

Pei-yan Lin ; Magnus Skoglundh (Institutionen för teknisk kemi) ; Lars Löwendahl (Institutionen för teknisk kemi) ; Jan-Erik Otterstedt (Institutionen för teknisk kemi) ; Leif Dahl ; Kjell Jansson ; Mats Nygren
Applied Catalysis B: Environmental (0926-3373). Vol. 6 (1995), 3, p. 237-319.
[Artikel, refereegranskad vetenskaplig]

25 Alumina-and silica-supported oxide-based catalysts were prepared, with the overall metal composition La(0.45)Sr(0.15)Ce(0.35)Zr(0.05)M(1.0) (M=Co or Cu) and promoted with 0-0.5 mg Pt-Rh per gram catalyst. The catalysts were evaluated with respect to light-off temperatures and redox characteristics, using NO/CO/C3H6/O2/N2 gas mixtures to simulate car exhaust. The activities for complete oxidation of propene and carbon monoxide increased with increasing content of metal oxides and noble metals. The catalysts were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) combined with energy-dispersive spectroscopy (EDS) analysis, temperature-programmed reduction (TPR), and specific surface area measurements (BET). SEM/TEM/XRD revealed that the alumina-supported catalysts contained well dispersed oxides of the added elements, whereas the silica-supported catalysts contained significantly larger particles of the copper or cobalt oxides, The TPR peak for reduction of cobalt oxide shifted toward lower temperatures with increasing content of Pt-Rh, indicating hydrogen spill-over from the noble metals to the cobalt oxide. The catalytic activity of the Co-based oxides supported on alumina and promoted with 0.49 mg Pt-Rh per gram catalysts was comparable to the activity of a commercial three-way catalyst (TWC), containing more than 4 times as much Pt-Rh.

Nyckelord: CARBON MONOXIDE OXIDATION; COBALT; COPPER; EXHAUST GAS CATALYSIS; PLATINUM; PROPENE OXIDATION; RHODIUM



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Denna post skapades 2012-02-06. Senast ändrad 2012-02-09.
CPL Pubid: 154798

 

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Institutioner (Chalmers)

Institutionen för teknisk kemi (1946-1998)

Ämnesområden

Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Transport
Hållbar utveckling
Kemiteknik

Chalmers infrastruktur