Reactivation of a Commercial Diesel Oxidation Catalyst by Acid Washing

The catalytic activity of samples taken from an oxidation catalyst mounted on diesel-driven automobiles and aged under road conditions was recovered to a significant extent by washing with a dilute solution of citric acid. The characterization of samples arising from a fresh, a vehicle-aged, and a r...

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Bibliographic Details
Published in:Environmental science & technology 2005-05, Vol.39 (10), p.3844-3848
Main Authors: Cabello Galisteo, Francisco, Mariscal, Rafael, López Granados, Manuel, Fierro, José Luis García, Brettes, Pilar, Salas, Oscar
Format: Article
Language:English
Subjects:
Air Pollution - prevention & control
Aluminum - analysis
Applied sciences
Atmospheric pollution
Automobiles
Catalysis
Catalytic converters
Catalytic oxidation
Citric Acid - chemistry
Comparative analysis
Diesel engines
Exact sciences and technology
Gasoline
Microscopy, Electron, Scanning
Other pollution sources in industry
Oxidation-Reduction
Phosphorus - analysis
Platinum - analysis
Pollution
Prevention and purification methods
Spectrum Analysis - methods
Sulfur - analysis
Vehicle Emissions
X-Ray Diffraction
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Summary:The catalytic activity of samples taken from an oxidation catalyst mounted on diesel-driven automobiles and aged under road conditions was recovered to a significant extent by washing with a dilute solution of citric acid. The characterization of samples arising from a fresh, a vehicle-aged, and a regenerated catalyst was carried out by scanning electron microscopy (SEM-EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Relatively high levels of S and P, in the form of aluminum sulfate and phosphate, respectively, together with contaminant Si were detected in the used catalyst. Washing of the vehicle-aged catalytic oxidation converter revealed high efficiency in the extraction of the main contaminants detected (S and P) by this nondestructive methodology. The results of the experiments reported here should encourage the development of a technology based on this reactivation procedure for the rejuvenation of the catalytic device mounted on diesel exhaust pipes.
ISSN:0013-936X
1520-5851
DOI:10.1021/es040062f