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Deactivation of diesel oxidation catalysts: Vehicle- and synthetic aging correlations

Paper ID Volume ID Publish Year Pages File Format Full-Text
48956 46533 2007 11 PDF Available
Title
Deactivation of diesel oxidation catalysts: Vehicle- and synthetic aging correlations
Abstract

Deactivation characteristics of a diesel oxidation catalyst subjected to controlled lab aging were compared to field-aged catalysts after 0, 80,000, and 160,000 km driving in order to establish the (dis)similarities between the two types of aging, and determine to what extent vehicle aging can be replaced by rapid synthetic aging. Emission tests confirmed the increasing deactivation of the field-aged catalysts and measurements of CO oxidation, Pt dispersion and hydrocarbon storage capacity were used together with XPS, TEM, and SEM–EDS to compare the performance with lab-aged catalysts. The synthetic aging was designed to account for a combination of thermal and chemical deactivation. A similar degree of Pt sintering was observed for both real and synthetic aging conditions, whereas differences arose from various contributions to the chemical deactivation. XPS showed that pre-oxidation and pre-reduction at 700 °C was not sufficient to remove typical compounds of oil-derived catalyst poisons (P, Zn, Ca), which furthermore accumulated with mileage, on the vehicle-aged catalysts. The degree of sulfur poisoning of the lab-aged catalysts increased with the duration of low-temperature sulfur exposure and could not be recovered in atmospheres typical for normal driving conditions. The results show that synthetic aging can be used to simulate thermal aging and a general effect of irreversible chemical deactivation, and thereby accelerate durability test procedures of various catalysts where loss of catalytic activity by time of operation is of concern.

Keywords
Oxidation catalyst; Accelerated aging; Deactivation; Sulfur; Phosphorous poisoning; Sintering
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Deactivation of diesel oxidation catalysts: Vehicle- and synthetic aging correlations
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 72, Issues 1–2, 8 March 2007, Pages 71–81
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us