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The effect of the contact between platinum and soot particles on the catalytic oxidation of soot deposits on a diesel particle filter

Paper ID Volume ID Publish Year Pages File Format Full-Text
48990 46536 2007 8 PDF Available
Title
The effect of the contact between platinum and soot particles on the catalytic oxidation of soot deposits on a diesel particle filter
Abstract

Experiments were performed with two model soot aerosols brought into different forms of contact with Pt aerosol particles, to investigate the effectiveness of this contact in lowering the catalytic soot oxidation temperature. The contact was either generated between individual particles in the aerosol state (Pt-doped soot to simulate a fuel borne catalyst), or by sequential or simultaneous deposition of separately generated soot and Pt aerosols onto a sintered metal filter. (Formation of a soot cake on previously deposited Pt aerosol would simulate a catalyst coated diesel particle filter.) The catalytic activity was determined in all cases from temperature ramped oxidation in air of the filtered particles, and defined as the 50% conversion temperature.It was found that Pt-doped soot and simultaneously filtered aerosols were both equally effective in reducing the oxidation temperature by up to 140–250 °C for the spark discharge soot (with 3–47 wt% Pt concentration in the soot cake), and by up to 140 °C for the pyrolysis soot (3 wt% Pt). Conversely, the deposition of a thin soot layer of 5–10 μm thickness onto Pt, or vice versa, produced only a slight temperature reduction on the order of about 13–42 °C. These results suggest that the distance between soot and Pt particles plays a key role in promoting an effective oxidation on the filter, which is consistent with the role of Pt particles as local generators of activated oxygen.

Keywords
Catalytic soot oxidation; Platinum; Diesel particle filter
First Page Preview
The effect of the contact between platinum and soot particles on the catalytic oxidation of soot deposits on a diesel particle filter
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 71, Issues 3–4, 15 February 2007, Pages 271–278
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis